Prospectus Supplement                                     424(b)(4)
(To Prospectus Dated May 23, 2001)         Form F-3 (Registration No. 333-50240)

                               12,000,000 SHARES

                                     [LOGO]

                           SUBORDINATE VOTING SHARES

                                  ------------

    Celestica Inc. is offering 12,000,000 subordinate voting shares in the
United States and Canada in a firm commitment underwriting. On May 22, 2001, the
last reported sale price of the subordinate voting shares on The New York Stock
Exchange was $61.21 per share and on The Toronto Stock Exchange was C$94.25 per
share.

                              -------------------

    The subordinate voting shares are listed on The New York Stock Exchange and
The Toronto Stock Exchange under the symbol "CLS".

                              -------------------

    INVESTING IN THE SUBORDINATE VOTING SHARES INVOLVES A HIGH DEGREE OF RISK.
SEE "RISK FACTORS" BEGINNING ON PAGE S-6 OF THIS PROSPECTUS SUPPLEMENT.

                               -----------------



                                                              PER SHARE      TOTAL
                                                              ---------   ------------
                                                                    
Offering Price..............................................   $59.50     $714,000,000
Commission to Underwriter...................................   $ 0.72     $  8,640,000
Offering Proceeds to Celestica..............................   $58.78     $705,360,000


    Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved these securities or determined if this
prospectus supplement is truthful or complete. Any representation to the
contrary is a criminal offense.

    We have granted the underwriter an option to purchase a maximum of
1,800,000 additional subordinate voting shares from us to cover over-allotments.
The underwriter can exercise this right at any time within thirty days after
this offering. Banc of America Securities LLC expects to deliver the shares to
purchasers on May 29, 2001.

                         Banc of America Securities LLC

                                  ------------

                                  May 23, 2001

                               TABLE OF CONTENTS


                                                           
                        PROSPECTUS SUPPLEMENT
                                                                PAGE
                                                              --------
The Company.................................................       S-3
The Offering................................................       S-5
Risk Factors................................................       S-6
Use of Proceeds.............................................       S-8
Capitalization..............................................       S-8
Underwriting................................................       S-9
Legal Matters...............................................      S-10

                              PROSPECTUS
                                                                PAGE
                                                              --------
Special Note on Forward-Looking Statements..................         3
About this Prospectus.......................................         3
Celestica Inc...............................................         3
About the Offerings.........................................         5
Risk Factors................................................         5
Use of Proceeds.............................................        11
Consolidated Ratio of Earnings to Fixed Charges.............        11
Where You Can Find More Information.........................        12
Plan of Distribution........................................        13
Description of Capital Stock................................        14
Description of Debt Securities..............................        21
Description of Warrants.....................................        26
Legal Matters...............................................        27
Auditors....................................................        27
Indemnification.............................................        27


    YOU SHOULD RELY ONLY ON THE INFORMATION IN THIS DOCUMENT OR TO WHICH WE HAVE
REFERRED YOU. WE HAVE NOT AUTHORIZED ANYONE TO PROVIDE YOU WITH ADDITIONAL OR
DIFFERENT INFORMATION. THIS DOCUMENT MAY ONLY BE USED WHERE IT IS LEGAL TO SELL
THE SUBORDINATE VOTING SHARES. THE INFORMATION IN THIS DOCUMENT MAY ONLY BE
ACCURATE AS OF THE DATE OF THIS PROSPECTUS SUPPLEMENT, REGARDLESS OF THE TIME OF
DELIVERY OF THIS DOCUMENT TO YOU OR ANY SALE OF THE SUBORDINATE VOTING SHARES.

    THIS DOCUMENT IS IN TWO PARTS. THE FIRST PART IS THE PROSPECTUS SUPPLEMENT,
WHICH DESCRIBES THE SPECIFIC TERMS OF OUR OFFERING OF THE SUBORDINATE VOTING
SHARES AND CERTAIN OTHER MATTERS. THE SECOND PART, THE ACCOMPANYING PROSPECTUS,
GIVES MORE GENERAL INFORMATION, SOME OF WHICH DOES NOT APPLY TO OUR OFFERING OF
THE SUBORDINATE VOTING SHARES. GENERALLY, WHEN WE REFER TO THE PROSPECTUS, WE
ARE REFERRING TO BOTH PARTS COMBINED.

    IN THIS PROSPECTUS, UNLESS WE STATE OTHERWISE "CELESTICA," THE "COMPANY,"
"WE," "US" AND "OUR" REFER TO CELESTICA INC. AND ITS SUBSIDIARIES.
                            ------------------------

    We furnish our shareholders with annual reports containing financial
statements prepared in accordance with Canadian generally accepted accounting
principles ("Canadian GAAP") audited by our independent accountants, with a
reconciliation of those financial statements to U.S. generally accepted
accounting principles ("U.S. GAAP"). We will make available copies of quarterly
reports for each of the first three quarters of each fiscal year containing
interim unaudited consolidated financial information.

    All dollar amounts in this prospectus are expressed in United States
dollars, except where we state otherwise. In this prospectus, unless we state
otherwise, all references to "U.S.$" or "$" are to U.S. dollars and all
references to "C$" are to Canadian dollars. At May 22, 2001, the Bank of Canada
daily noon rate was U.S.$1.00=C$1.5407.

    Canada has no system of exchange controls. There are no Canadian
restrictions on the repatriation of capital or earnings of a Canadian public
company to non-resident investors. There are no laws of Canada or exchange
restrictions affecting the remittance of dividends, interest, royalties or
similar payments to non-resident holders of our securities, except as described
under the caption "Description of Capital Stock -- Certain Canadian Federal
Income Tax Considerations" found in the accompanying prospectus.

                                      S-2

                                  THE COMPANY

    We are a leading provider of electronics manufacturing services, or EMS, to
original equipment manufacturers, or OEMs, worldwide. We are the third largest
EMS provider in the world with revenue for the year ended December 31, 2000 of
approximately $9.8 billion. We have operations in the United States, Canada,
Mexico, United Kingdom, Ireland, Italy, Thailand, China, Hong Kong, Czech
Republic, Brazil, Singapore, Malaysia and Japan. We provide a wide variety of
products and services to our customers, including manufacture, assembly and test
of complex printed circuit assemblies and full system assembly of final
products. In addition, we provide a broad range of EMS services from product
design to worldwide distribution and after-sales support.

    We target leading OEMs primarily in the computer and communications sectors.
We supply products and services to more than 50 OEMs, including the following
industry leaders:


                                              
    - Avaya Inc.                                 - International Business Machines Corporation
    - Cisco Systems Inc.                         - Lucent Technologies Inc.
    - Dell Computer Corporation                  - Motorola, Inc.
    - EMC Corporation                            - NEC Corporation
    - Fujitsu-ICL Systems Inc.                   - Nortel Networks Corporation
    - Hewlett-Packard Company                    - Sun Microsystems Inc.


    The products we manufacture include, or can be found in, a wide range of
end-products, such as:


                                                             
    - hubs and switches              - multimedia peripherals      - switching products
    - LAN and WAN networking cards   - PBX switches                - token ring products
    - laser printers                 - personal computers          - video broadcasting cards
    - mainframe computers            - photonic devices            - wireless base stations
    - mass storage devices           - routers                     - wireless loop systems
    - medical ultrasound devices     - scalable processors         - workstations
    - modems                         - servers


    Our principal competitive advantages are our advanced capabilities in the
areas of technology, quality and supply chain management. We are an industry
leader in a wide range of advanced manufacturing technologies, using established
and newly emerging processes. Our state-of-the-art manufacturing facilities are
organized as customer-focused factories, which have dedicated manufacturing
lines and customer teams. This approach enhances customer satisfaction and
manufacturing flexibility. We believe our test capabilities are among the best
in the industry and enable us to produce highly reliable products, including
products that are critical to the functioning of our customers' products and
systems. Our size, geographic reach and leading expertise in supply chain
management allow us to purchase materials effectively and to deliver products to
customers faster, thereby reducing overall product costs and reducing the time
to market.

    We also believe that our highly skilled workforce gives us a distinct
competitive advantage. Through innovative compensation and broad-based employee
stock ownership, we have developed a unique entrepreneurial, participative and
team-based culture. We employ over 2,500 engineers.

    Our goal is to be the EMS "partner of choice" to leading OEMs. Our strategy
is to:

    - maintain our leadership position in the areas of technology, quality and
      supply chain management;

    - develop profitable, strategic relationships with industry leaders
      primarily in the computer and communications sectors;

    - continually expand the range of services we provide to OEMs;

    - diversify our customer base, serving a wide variety of end-markets;

    - selectively pursue strategic acquisitions; and

    - steadily improve our operating margins.

                                      S-3

    Our industry is growing rapidly. EMS industry growth is being fueled by
increased outsourcing of manufacturing and related functions by OEMs worldwide
and by the growth of the overall electronics industry.

    We see numerous industry vectors that are fueling continued growth in the
EMS industry. These include:

    - the growing trend by telecommunications companies and electronics firms to
      outsource their manufacturing and divest of their manufacturing assets;

    - the impact the growth of the internet is having on the development of
      faster and more powerful hardware, such as networking devices and servers;

    - the growing trend for Japanese-based companies to outsource manufacturing;
      and

    - the increasing number of acquisition opportunities in the area of EMS,
      including OEM divestitures.

    Our industry is highly fragmented. In 2000, the four largest participants
(including us) accounted for approximately 54% of total industry revenue.
Because of the advantages of size and geographic diversity in servicing global
OEMs, our industry is poised for significant consolidation.

    Between the beginning of 1997 and May 23, 2001, we have completed 25
acquisitions. These acquisitions have significantly enhanced our geographic
reach, expanded our customer base of leading OEMs and broadened our service
offering capabilities. We continue to seek strategic acquisitions and
opportunities to establish greenfield operations. Consistent with our past
practices and as part of the normal course of our business, we may from time to
time be engaged in discussions with respect to possible acquisitions of widely
varying sizes, from small single facility acquisitions, to significant multiple
facility acquisitions to corporate acquisitions, for consideration that could
include cash or subordinate voting shares. We are continuously identifying and
reviewing possible acquisitions that would enhance our global operations,
increase our penetration in the industries we are targeting and establish
strategic relationships with new customers. We currently are involved in
discussions at an advanced stage concerning certain of these opportunities. The
possible purchase prices of these opportunities range from $50 million to
$300 million. There can be no assurance that any of these discussions will
result in a transaction and, if they do, what the terms, form of consideration
or timing of any transaction would be. We expect to continue the current
discussions and actively pursue other opportunities.

    Our principal executive office is located at 12 Concorde Place, Toronto,
Ontario, Canada MC3 3R8 and our telephone number is (416) 448-5800.

                                      S-4

                                  THE OFFERING


                                                                             
Shares offered.........................   12,000,000   subordinate voting shares
                                         ===========

Shares to be outstanding after this
  offering:
  Subordinate voting shares............  177,070,327   subordinate voting shares(1)
  Multiple voting shares...............   39,065,950   multiple voting shares(2)
                                         -----------
    Total..............................  216,136,277   shares(1)(2)(3)
                                         ===========

Over-allotment option..................    1,800,000   subordinate voting shares
                                         -----------



                                      
Voting rights:
  Subordinate voting shares............  One vote per share
  Multiple voting shares...............  25 votes per share(3)

Use of Proceeds........................  We will use the net proceeds for capital expenditures,
                                         working capital and general corporate purposes, including
                                         possible future acquisitions. We regularly review
                                         acquisition opportunities. However, we have no contract or
                                         arrangement with respect to any material acquisition.
                                         Pending these uses, net proceeds will be added to our cash
                                         resources.

Dividend Policy........................  We currently intend to retain our earnings to invest in our
                                         future growth. We do not expect to pay dividends for the
                                         foreseeable future.

NYSE and TSE symbol....................  CLS


------------

(1) These numbers do not include (a) approximately 29,300,000 subordinate voting
    shares that are reserved for issuance under our employee share purchase and
    option plans and for director compensation, including outstanding options to
    purchase approximately 17,030,000 shares, (b) approximately
    10,291,534 subordinate voting shares that are reserved for issuance upon
    conversion of our Liquid Yield Option-TM- Notes due 2020, or (c) up to
    1,800,000 subordinate voting shares that we may issue if the over-allotment
    option is exercised.

(2) The multiple voting shares are held by Onex Corporation. These shares are
    convertible on a one-for-one basis into subordinate voting shares at any
    time at the option of the holder. The multiple voting shares will
    automatically convert on a one-for-one basis into subordinate voting shares
    under certain circumstances, including upon certain sales of the shares by
    Onex Corporation.

(3) Except as otherwise required by law, the subordinate voting shares and
    multiple voting shares vote together as a single class on all matters
    submitted to a vote of our shareholders, including the election of
    directors. Upon completion of this offering, the outstanding subordinate
    voting shares will have 15.3% of the voting power of all of our shares.

                                      S-5

                                  RISK FACTORS

    YOU SHOULD CAREFULLY CONSIDER EACH OF THE FOLLOWING RISKS AND ALL OF THE
OTHER INFORMATION SET FORTH IN THIS PROSPECTUS SUPPLEMENT AND THE ACCOMPANYING
PROSPECTUS BEFORE MAKING YOUR INVESTMENT DECISION. THE RISKS AND UNCERTAINTIES
DESCRIBED BELOW AND IN THE ACCOMPANYING PROSPECTUS ARE NOT THE ONLY ONES FACING
OUR COMPANY. ADDITIONAL RISKS AND UNCERTAINTIES NOT PRESENTLY KNOWN TO US OR
THAT WE CURRENTLY BELIEVE TO BE IMMATERIAL MAY ALSO ADVERSELY AFFECT OUR
BUSINESS.

    IF ANY OF THE RISKS AND UNCERTAINTIES WE DESCRIBE DEVELOP INTO ACTUAL
EVENTS, OUR BUSINESS, FINANCIAL CONDITION AND RESULTS OF OPERATIONS COULD BE
MATERIALLY ADVERSELY AFFECTED. IN THIS CASE, THE TRADING PRICE OF OUR
SUBORDINATE VOTING SHARES COULD DECLINE, AND YOU MAY LOSE ALL OR PART OF YOUR
INVESTMENT.

    THIS PROSPECTUS SUPPLEMENT, THE ACCOMPANYING PROSPECTUS AND THE DOCUMENTS WE
INCORPORATE BY REFERENCE INCLUDE "FORWARD-LOOKING STATEMENTS" WITHIN THE MEANING
OF SECTION 27A OF THE SECURITIES ACT OF 1933, OR THE SECURITIES ACT, AND
SECTION 21E OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED, OR THE EXCHANGE
ACT. FORWARD-LOOKING STATEMENTS MAY BE IDENTIFIED BY THE USE OF WORDS LIKE
"BELIEVES," "INTENDS," "EXPECTS," "MAY," "WILL," "SHOULD" OR "ANTICIPATES," OR
THE NEGATIVE EQUIVALENTS OF THOSE WORDS OR COMPARABLE TERMINOLOGY, AND BY
DISCUSSIONS OF STRATEGIES THAT INVOLVE RISKS AND UNCERTAINTIES.

    GIVEN THE RISKS AND UNCERTAINTIES OF OUR BUSINESS, ACTUAL RESULTS MAY DIFFER
MATERIALLY FROM THOSE EXPRESSED OR IMPLIED BY FORWARD-LOOKING STATEMENTS. IN
ADDITION, WE BASE FORWARD-LOOKING STATEMENTS ON ASSUMPTIONS ABOUT FUTURE EVENTS,
WHICH MAY NOT PROVE TO BE ACCURATE. IN LIGHT OF THESE RISKS, UNCERTAINTIES AND
ASSUMPTIONS, YOU SHOULD BE AWARE THAT THE FORWARD-LOOKING EVENTS DESCRIBED IN
THIS PROSPECTUS SUPPLEMENT, THE ACCOMPANYING PROSPECTUS AND THE DOCUMENTS WE
INCORPORATE BY REFERENCE MAY NOT OCCUR.

    WE CANNOT ASSURE YOU THAT OUR FUTURE RESULTS, LEVELS OF ACTIVITY AND
ACHIEVEMENTS WILL OCCUR AS WE EXPECT, AND NEITHER WE NOR ANY OTHER PERSON
ASSUMES RESPONSIBILITY FOR THE ACCURACY AND COMPLETENESS OF OUR FORWARD-LOOKING
STATEMENTS. EXCEPT AS REQUIRED BY LAW, WE HAVE NO OBLIGATION TO UPDATE OR REVISE
ANY FORWARD-LOOKING STATEMENT, WHETHER AS A RESULT OF NEW INFORMATION, FUTURE
EVENTS OR OTHERWISE.

RISKS RELATED TO OUR SUBORDINATE VOTING SHARES

  POTENTIAL ADVERSE EFFECT OF SHARES ELIGIBLE FOR FUTURE SALE

    Future sales of our subordinate voting shares in the public market, or the
issuance of subordinate voting shares upon the exercise of stock options or
otherwise, could adversely affect the market price of the subordinate voting
shares.

    As of April 15, 2001, we had 164,811,377 subordinate voting shares and
39,065,950 multiple voting shares outstanding. All of the subordinate voting
shares are freely transferable without restriction or further registration under
the Securities Act, except for shares issued under employee share purchase plans
and any shares held by our affiliates (as defined in the Securities Act). Shares
held by our affiliates include all of the multiple voting shares and 4,812,906
 subordinate voting shares held by Onex Corporation. An affiliate may not sell
shares in the United States unless the sale is registered under the Securities
Act or an exemption from registration is available. Rule 144 adopted under the
Securities Act permits our affiliates to sell shares in the United States
subject to volume limitations and requirements relating to manner of sale,
notice of sale and availability of current public information with respect to
Celestica.

    In addition, as of April 15, 2001, there were approximately
29,519,000 subordinate voting shares reserved for issuance under our employee
share purchase and option plans and for director compensation, including
outstanding options to purchase approximately 17,047,000  shares. The sale of
such shares could adversely affect the market price of the subordinate voting
shares.

  OUR COMPANY IS CONTROLLED BY ONEX CORPORATION

    Onex Corporation owns, directly or indirectly, all of the multiple voting
shares and approximately 1.1% of the outstanding subordinate voting shares. The
number of shares owned by Onex, together with those shares Onex has the right to
vote, represent 86.0% of the voting interest in our company and include 2.9% of
our outstanding subordinate voting shares. Accordingly, Onex exercises a
controlling influence over our business and affairs and has the power to
determine all matters submitted to a vote of our shareholders where our shares
vote

                                      S-6

together as a single class. Onex has the power to elect our directors and to
approve significant corporate transactions such as certain amendments to our
articles of incorporation, mergers, amalgamations, plans of arrangement and the
sale of all or substantially all of our assets. Onex's voting power could have
the effect of deterring or preventing a change in control of our company that
might otherwise be beneficial to our other shareholders. Under our revolving
credit facilities, if Onex ceases to control Celestica our lenders could demand
repayment. Gerald W. Schwartz, the Chairman, President and Chief Executive
Officer of Onex and one of our directors, owns shares with a majority of the
voting rights of the shares of Onex. Mr. Schwartz, therefore, effectively
controls our affairs.

    In private placements outside of the United States certain subsidiaries of
Onex offered exchangeable debentures due 2025 that are exchangeable and
redeemable under certain circumstances during their 25-year term for
9,214,320 subordinate voting shares. In addition, 1,757,467 subordinate voting
shares may be delivered, at the option of Onex or certain persons related to
Onex, to satisfy the obligations of such persons under equity forward
agreements. If the issuers of the exchangeable debentures elect or the party to
the equity forward agreements elects to deliver solely subordinate voting shares
and no cash upon the exchange or redemption, or at maturity or acceleration, of
the debentures or the settlement of the equity forward agreement, as the case
may be, the number of shares owned by Onex, together with those shares Onex has
the right to vote, would, if such delivery had occurred on April 18, 2001,
represent in the aggregate 81.4% of the voting interest in our company and 1.7%
of our outstanding subordinate voting shares.

  POTENTIAL VOLATILITY OF SHARE PRICE

    The markets for our subordinate voting shares are highly volatile. The
trading price of subordinate voting shares could fluctuate widely in response
to:

    - Quarterly variations in our operations and financial results;

    - Announcements by us or our competitors of technological innovations, new
      products, new contracts or acquisitions;

    - Changes in our prices or the prices of our competitors' products and
      services;

    - Changes in our product mix;

    - Changes in our growth rate as a whole or for a particular portion of our
      business;

    - General conditions in the EMS industry; and

    - Systemic fluctuations in the stock markets.

    The stock markets have fluctuated widely in the past. The securities of many
technology companies, including companies in the EMS industry, have experienced
extreme price and volume fluctuations, which often have been unrelated to the
companies' operating performance. These broad market fluctuations may adversely
affect the market price of the subordinate voting shares.

  IMMEDIATE AND SUBSTANTIAL DILUTION

    Purchasers in this offering will be paying $42.45, or 71.4%, per share more
than the pro forma net tangible book value per share at March 31, 2001.

  POTENTIAL UNENFORCEABILITY OF CIVIL LIABILITIES AND JUDGMENTS

    We are incorporated under the laws of the Province of Ontario, Canada. Most
of our directors, controlling persons and officers and certain of the experts
named in this prospectus are residents of Canada. Also, a substantial portion of
our assets and the assets of these persons are located outside of the United
States. As a result, it may be difficult for shareholders to initiate a lawsuit
within the United States against these non-U.S. residents, or to enforce
judgments in the United States against us or these persons which are obtained in
a U.S. court. It may also be difficult for shareholders to enforce a U.S.
judgment in Canada or to succeed in a lawsuit in Canada based only on U.S.
securities laws.

                                      S-7

                                USE OF PROCEEDS

    Our estimated net proceeds from this offering will be $704.0 million after
deducting the underwriting commission and the estimated expenses of this
offering payable by Celestica, assuming that the underwriter does not exercise
its over-allotment option. If the underwriter exercises its over-allotment
option in full, our net proceeds will be approximately $809.8 million.

    We will use the net proceeds for capital expenditures, working capital and
general corporate purposes, including future acquisitions. Pending these uses,
we will invest the net proceeds in short-term, interest bearing,
investment-grade securities. We regularly review acquisition opportunities. We
have no contract or arrangement with respect to any material acquisition.

                                 CAPITALIZATION

    The following table sets forth our actual capitalization and our
capitalization as adjusted to give effect to this offering as at March 31, 2001.



                                                                        AS AT MARCH 31, 2001(1)
                                                              -------------------------------------------
                                                                     ACTUAL              AS ADJUSTED
                                                              --------------------   --------------------
                                                                        (dollars in thousands)
                                                                               
Long-term debt(2)
  Revolving loans...........................................       $       --             $       --
  Senior subordinated notes due 2006........................          130,000                130,000
  Term loans................................................               --                     --
  Other long-term debt......................................              977                    977
                                                                   ----------             ----------
    Total long-term debt....................................          130,977                130,977
                                                                   ----------             ----------

Shareholders' equity(3):
  LYONs(4)..................................................          866,863                866,863
  Subordinate voting shares.................................        2,260,842(5)           2,964,842(5)
    (authorized: unlimited)                                      (164,773,434           (176,773,434
                                                                       shares)                shares)
  Subordinate voting shares to be issued(6).................            1,341                  1,341
                                                                     (308,395               (308,395
                                                                       shares)                shares)
  Multiple voting shares....................................          138,811                138,811
    (authorized: unlimited)                                       (39,065,950            (39,065,950
                                                                       shares)                shares)
  Retained earnings.........................................          268,883                268,883
  Foreign currency translation adjustment...................           (4,217)                (4,217)
                                                                   ----------             ----------
    Total shareholders' equity..............................        3,532,523              4,236,523
                                                                   ----------             ----------
Total capitalization........................................        3,663,500              4,367,500
                                                                   ==========             ==========


------------

(1) Cash and short-term investments at March 31, 2001 were $482.9 million and,
    as adjusted to give effect to this offering, would be $1,186.9 million.
    Assuming the exercise of the underwriter's over-allotment option in full,
    total shareholders' equity and total capitalization at March 31, 2001 would
    have been $4,342.3 million and $4,473.3 million, respectively, and cash and
    short-term investments would have been $1,292.7 million.

(2) Includes current portion of long-term debt. See Note 9 to our consolidated
    financial statements included in our annual report on Form 20-F for the year
    ended December 31, 2000.

(3) Our authorized capital consists of an unlimited number of preference shares,
    issuable in series, an unlimited number of subordinate voting shares and an
    unlimited number of multiple voting shares. At March 31, 2001, no preference
    shares, 164,773,434 subordinate voting shares and 39,065,950 multiple voting
    shares were issued and outstanding. For additional information on our share
    capital, please turn to "Description of Capital Stock" at pages 14 to 16 in
    the accompanying prospectus.

(4) We record the LYONs as equity pursuant to Canadian GAAP. Under U.S. GAAP,
    the LYONs would be classified as long-term debt and, accordingly, the
    accrued yield on the LYONs during any period would be classified as interest
    expense for that period.

(5) Does not include (a) approximately 17,030,000 subordinate voting shares
    issuable upon exercise of outstanding options granted under our employee
    share purchase and option plans or up to 500,000 subordinate voting shares
    that may be issued as compensation to directors, (b) 10,291,534
    subordinate voting shares reserved for issuance upon conversion of the LYONs
    or (c) 1,800,000 subordinate voting shares reserved for issuance if the
    underwriters exercise their over-allotment option in full.

(6) We have reserved 308,395 shares at an ascribed value of $1.3 million for
    options granted under certain stock option and purchase plans of
    International Manufacturing Services, Inc. which we assumed on December 30,
    1998. These options had an exercise price below the market value of the
    subordinate voting shares at the date of the merger with IMS.

                                      S-8

                                  UNDERWRITING

    Under the terms and subject to the conditions contained in an underwriting
agreement dated May 22, 2001, Banc of America Securities LLC agreed to purchase,
and we agreed to sell, an aggregate of 12,000,000 subordinate voting shares at
the public offering price and we agreed to pay the underwriting commission set
forth on the cover page of this prospectus supplement. After the initial
offering, the offering price may be changed by the underwriter.

    Banc of America Securities LLC is offering the subordinate voting shares
subject to its acceptance of the shares from us and subject to prior sale. The
underwriting agreement provides that the obligations of Banc of America
Securities LLC to pay for and accept delivery of the subordinate voting shares
offered hereby are subject to the approval of certain legal matters by its
counsel and to certain other conditions. Banc of America Securities LLC is
obligated to take and pay for all of the subordinate voting shares offered
hereby (other than those covered by the underwriter's over-allotment option
described below) if any such shares are taken.

    This offering is being made concurrently in Canada and in the United States.
Subject to applicable law, the underwriter may offer the subordinate voting
shares outside Canada and the United States. The Canadian broker-dealer
affiliate of the underwriter may sell subordinate voting shares in Canada
pursuant to applicable law.

    We have granted to the underwriter an option, exercisable until June 28,
2001, to purchase up to an aggregate of 1,800,000 additional subordinate voting
shares at the public offering price set forth on the cover page hereof less the
underwriting commission. The underwriter may exercise such option solely for the
purpose of covering over-allotments, if any, made in connection with this
offering. To the extent such option is exercised, the underwriter will become
obligated, subject to certain conditions, to purchase such additional
subordinate voting shares. If the underwriter exercises the over-allotment
option in full, the total price to the public will be $821,100,000, the total
underwriter's commission will be $9,936,000 and the total proceeds to us, net of
underwriter's commission, will be $811,164,000.

    We have agreed that, without the prior written consent of Banc of America
Securities LLC, we will not, during the period ending 90 days after the date of
the closing of this offering, (i) offer, issue, pledge, sell, contract to sell,
sell any option or contract to purchase, purchase any option or contract to
sell, grant any option, right or warrant to purchase, or otherwise lend,
transfer or dispose of, directly or indirectly, any subordinate voting shares or
any securities convertible into or exercisable or exchangeable for subordinate
voting shares or (ii) enter into any swap or other arrangement that transfers to
another, in whole or in part, any of the economic consequences of ownership of
subordinate voting shares, whether any such transaction described in clause
(i) or (ii) above is to be settled by delivery of subordinate voting shares or
such other securities, in cash or otherwise. The restrictions described in this
paragraph do not apply to (a) the sale of subordinate voting shares to the
underwriters, (b) the issuance by us of subordinate voting shares upon the
exercise of an option or a warrant or the conversion of a security outstanding
on the date of this prospectus supplement of which the underwriter have been
advised in writing, (c) the issuance by us of any options or subordinate voting
shares pursuant to our existing option plans, (d) the repurchase of subordinate
voting shares by us pursuant to an employee stock purchase plan from an employee
upon termination of such employee's employment or upon the default by such
employee on a loan incurred to acquire such subordinate voting shares (or a
refinancing of such loans), or (e) the issuance by us of subordinate voting
shares or other securities in connection with the acquisition of any business,
facilities or other assets, including the issuance of subordinate voting shares
or other securities in connection with employment agreements relating to any
such acquisition.

    In order to facilitate the offering of the subordinate voting shares, the
underwriter may engage in transactions that stabilize, maintain or otherwise
affect the market price of the subordinate voting shares. Any of these
activities may maintain the market price of our subordinate voting shares at a
level above that which might otherwise prevail in the open market. The
underwriter is not required to engage in these activities and, if commenced, may
end any of these activities at any time.

    The underwriter or its affiliates have in the past engaged, and may in the
future engage, in transactions with and perform services, including commercial
banking, financial advisory and investment banking services, for us

                                      S-9

and our affiliates in the ordinary course of business for which they have
received or may receive customary compensation. Affiliates of Banc of America
Securities LLC are lenders under our credit facility.

    Celestica and the underwriter have agreed to indemnify each other against
certain liabilities, including liabilities under the Securities Act and Canadian
provincial securities legislation.

    You can reach Banc of America Securities LLC at 600 Montgomery Street, San
Francisco, California 94111, Attention: Equity Capital Markets.

    Pursuant to policy statements of the Ontario Securities Commission and the
Commission des valeurs mobilieres du Quebec, the underwriter in Canada may not,
throughout the period of distribution bid for or purchase subordinate voting
shares. The foregoing restriction is subject to exceptions, on the condition
that the bid or purchase not be engaged in for the purpose of creating actual or
apparent active trading in or raising the price of, the subordinate voting
shares. Such exceptions include a bid or purchase permitted under the rules of
the TSE relating to market stabilization and passive market-making activities
and a bid or purchase made for and on behalf of a customer where the order was
not solicited during the period of distribution. We have been advised that in
connection with the offering and pursuant to the first-mentioned exception, the
underwriter may over-allot or effect transactions which stabilize or maintain
the market price of the subordinate voting shares at levels other than those
which might otherwise prevail on the open market. Such transactions, if
commenced, may be discontinued at any time.

EXPENSES OF ISSUANCE AND DISTRIBUTION

    The following table sets forth the estimated expenses payable by us in
connection with the offering and distribution of the subordinate voting shares
sold in this offering (excluding the underwriting commission):



NATURE OF EXPENSE                                                AMOUNT
-----------------                                             ------------
                                                                       
SEC registration fee........................................  $    220,000
Filing fees with Canadian securities regulatory
  authorities...............................................       100,000
National Association of Securities Dealers filing fee.......        10,000
NYSE listing fee............................................        80,000
TSE listing fee.............................................        40,000
Accounting fees and expenses................................       150,000
Legal fees and expenses.....................................       400,000
Printing expenses...........................................       300,000
Miscellaneous...............................................        60,000
                                                              ------------
  Total.....................................................  $  1,360,000
                                                              ============


                                 LEGAL MATTERS

    Certain legal matters in connection with the subordinate voting shares
offered hereby will be passed upon for us by Kaye Scholer LLP, U.S. counsel for
the Company, and Davies Ward Phillips & Vineberg LLP, Canadian counsel for the
Company, and for the underwriter by Shearman & Sterling, U.S. counsel for the
underwriter, and Osler, Hoskin & Harcourt LLP, Canadian counsel for the
underwriter. As of the date hereof, certain lawyers with Davies Ward Phillips &
Vineberg LLP and Kaye Scholer LLP own, directly or indirectly, in the aggregate,
less than one percent of the outstanding subordinate voting shares.

                                      S-10

                                   PROSPECTUS

                                 $2,156,773,792

                                     [LOGO]

                           SUBORDINATE VOTING SHARES
                               PREFERENCE SHARES
                                DEBT SECURITIES
                                    WARRANTS
                                ----------------

We will provide the specific terms of the securities we are offering in a
supplement to this prospectus. We may not use this prospectus to sell
subordinate voting shares, preference shares, debt securities or warrants to
purchase subordinate voting shares, preference shares, debt securities or other
securities unless we also give prospective investors a supplement to this
prospectus. You should read this prospectus and the supplement carefully before
you invest.

This prospectus may also be used by our shareholders to offer subordinate voting
shares. Any selling shareholders will be named in a supplement to this
prospectus.

Our shares are traded on The New York Stock Exchange and The Toronto Stock
Exchange under the symbol "CLS".

See "Risk Factors" on page 5 for information you should consider before buying
the securities.

Each prospectus supplement will describe additional risk factors. These factors
may concern the securities we are offering or our company.

                            ------------------------

THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. WE MAY
NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER
TO SELL THESE SECURITIES AND IT IS NOT SOLICITING AN OFFER TO BUY THESE
SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.

                            ------------------------

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS
PROSPECTUS OR ANY ACCOMPANYING PROSPECTUS SUPPLEMENT IS TRUTHFUL OR COMPLETE.
ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

                            ------------------------

                  The date of this prospectus is May 23, 2001

                               TABLE OF CONTENTS



                                                                PAGE
                                                              --------
                                                           
Special Note on Forward-Looking Statements..................         3

About this Prospectus.......................................         3

Celestica Inc...............................................         3

About the Offerings.........................................         5

Risk Factors................................................         5

Use of Proceeds.............................................        11

Consolidated Ratio of Earnings to Fixed Charges.............        11

Where You Can Find More Information.........................        12

Plan of Distribution........................................        13

Description of Capital Stock................................        14

Description of Debt Securities..............................        21

Description of Warrants.....................................        26

Legal Matters...............................................        27

Auditors....................................................        27

Indemnification.............................................        27


    YOU SHOULD RELY ONLY ON THE INFORMATION INCORPORATED BY REFERENCE OR
PROVIDED IN THIS PROSPECTUS OR ANY PROSPECTUS SUPPLEMENT. WE HAVE NOT AUTHORIZED
ANYONE TO PROVIDE YOU WITH INFORMATION DIFFERENT FROM THAT CONTAINED IN THIS
PROSPECTUS. WE ARE NOT MAKING AN OFFER TO SELL, OR SEEKING OFFERS TO BUY, THESE
SECURITIES IN ANY STATE WHERE OFFERS AND SALES ARE NOT PERMITTED. YOU SHOULD NOT
ASSUME THAT THE INFORMATION CONTAINED IN THIS PROSPECTUS OR ANY PROSPECTUS
SUPPLEMENT IS ACCURATE AS OF ANY DATE OTHER THAN THE DATE ON THE FRONT OF THOSE
DOCUMENTS.

    IN THIS PROSPECTUS, "CELESTICA," THE "COMPANY," "WE," "US" AND "OUR" REFER
TO CELESTICA INC. AND ITS SUBSIDIARIES.

                            ------------------------

    We furnish our shareholders with annual reports containing financial
statements prepared in accordance with Canadian generally accepted accounting
principles audited by our independent accountants, with a reconciliation of
those financial statements to U.S. generally accepted accounting principles. We
will make available copies of quarterly reports for each of the first three
quarters of each fiscal year containing interim unaudited consolidated financial
information.

    All dollar amounts in this prospectus are expressed in United States
dollars, except where we state otherwise. In this prospectus, unless we state
otherwise, all references to "U.S.$" or "$" are to U.S. dollars.

    Canada has no system of exchange controls. There are no Canadian
restrictions on the repatriation of capital or earnings of a Canadian public
company to non-resident investors. There are no laws of Canada or exchange
restrictions affecting the remittance of dividends, interest, royalties or
similar payments to non-resident holders of our securities, except as described
under the caption "Description of Capital Stock--Certain Canadian Federal Income
Tax Considerations."

                                       2

                   SPECIAL NOTE ON FORWARD-LOOKING STATEMENTS

    We include this disclosure to take advantage of the "safe harbor" provisions
of the Private Securities Litigation Reform Act of 1995.

    This prospectus (and any prospectus supplement) and the documents
incorporated by reference in this prospectus (and in any prospectus supplement)
include "forward-looking statements" within the meaning of section 27A of the
Securities Act of 1933, as amended, or the Securities Act, and section 21E of
the Securities Exchange Act of 1934, as amended, or the Exchange Act.
Forward-looking statements may be identified by the use of words like
"believes," "intends," "expects," "may," "will," "should" or "anticipates," or
the negative equivalents of those words or comparable terminology, and by
discussions of strategies that involve risks and uncertainties.

    Given the risks and uncertainties of our business, actual results may differ
materially from those expressed or implied by forward-looking statements. In
addition, we base forward-looking statements on assumptions about future events,
which may not prove to be accurate. In light of these risks, uncertainties and
assumptions, you should be aware that the forward-looking events described in
this prospectus (and in any prospectus supplement) and the documents
incorporated by reference in this prospectus (and in any prospectus supplement)
may not occur.

    We cannot assure you that our future results, levels of activity and
achievements will occur as we expect, and neither we nor any other person
assumes responsibility for the accuracy and completeness of our forward-looking
statements. We have no obligation to update or revise any forward-looking
statement, whether as a result of new information, future events or otherwise.

                             ABOUT THIS PROSPECTUS

    This prospectus is part of a registration statement that we filed with the
Securities and Exchange Commission utilizing a "shelf" registration process.
Under this shelf registration process, we may offer any combination of the
securities described in this prospectus, and our shareholders may offer
subordinate voting shares, in one or more offerings up to the total dollar
amount of $2,156,773,792. This prospectus provides you with a general
description of the securities we may offer. Each time we use this prospectus, we
will provide a prospectus supplement that will contain specific information
about the securities to be sold and the terms of that offering. The prospectus
supplement may also add, update or change information contained in this
prospectus, and may identify one or more selling shareholders. It is important
for you to consider the information contained in this prospectus and any
prospectus supplement together with any additional information described under
the heading "Where You Can Find More Information" in making your investment
decision.

                                 CELESTICA INC.

    We are a leading provider of electronics manufacturing services, or EMS, to
original equipment manufacturers, or OEMs, worldwide. We are the third largest
EMS provider in the world with revenue for the year ended December 31, 2000 of
approximately $9.8 billion. We have operations in the United States, Canada,
Mexico, United Kingdom, Ireland, Italy, Thailand, China, Hong Kong, Czech
Republic, Brazil, Singapore, Malaysia and Japan. We provide a wide variety of
products and services to our customers, including manufacture, assembly and test
of complex printed circuit assemblies and full system assembly of final
products. In addition, we provide a broad range of EMS services from product
design to worldwide distribution and after-sales support.

                                       3

    We target industry leading OEMs primarily in the computer and communications
sectors. We supply products and services to more than 50 OEMs, including the
following industry leaders:


                                                  
- Cisco Systems Inc.                                 - Lucent Technologies Inc.
- Dell Computer Corporation                          - Motorola, Inc.
- EMC Corporation                                    - NEC Corporation
- Fujitsu-ICL Systems Inc.                           - Nortel Networks Corporation
- Hewlett-Packard Company                            - Sun Microsystems Inc.
- International Business Machines Corporation


    The products we manufacture include, or can be found in, a wide range of
end-products, such as:


                                                            
- hubs and switches              - multimedia peripherals         - switching products
- LAN and WAN networking cards   - PBX switches                   - token ring products
- laser printers                 - personal computers             - video broadcasting cards
- mainframe computers            - photonic devices               - wireless base stations
- mass storage devices           - routers                        - wireless loop systems
- medical ultrasound devices     - scalable processors            - workstations
- modems                         - servers


    Our principal competitive advantages are our advanced capabilities in the
areas of technology, quality and supply chain management. We are an industry
leader in a wide range of advanced manufacturing technologies, using established
and newly emerging processes. Our state-of-the-art manufacturing facilities are
organized as customer-focused factories, which have dedicated manufacturing
lines and customer teams. This approach enhances customer satisfaction and
manufacturing flexibility. We believe our test capabilities are among the best
in the industry and enable us to produce highly reliable products, including
products that are critical to the functioning of our customers' products and
systems. Our size, geographic reach and leading expertise in supply chain
management allow us to purchase materials effectively and to deliver products to
customers faster, thereby reducing overall product costs and reducing the time
to market.

    We also believe that our highly skilled workforce gives us a distinct
competitive advantage. Through innovative compensation and broad-based employee
stock ownership, we have developed a unique entrepreneurial, participative and
team-based culture. We employ over 2,500 engineers.

    Our goal is to be the EMS "partner of choice" to leading OEMs. Our strategy
is to:

    - maintain our leadership position in the areas of technology, quality and
      supply chain management;

    - develop profitable, strategic relationships with industry leaders
      primarily in the computer and communications sectors;

    - continually expand the range of the services we provide to OEMs;

    - diversify our customer base, serving a wide variety of end-markets;

    - selectively pursue strategic acquisitions; and

    - steadily improve our operating margins.

    Our industry is growing rapidly. EMS industry growth is being fueled by
increased outsourcing of manufacturing and related functions by OEMs worldwide
and by the growth of the overall electronics industry.

    We see numerous industry vectors that are fueling continued growth in the
EMS industry. These include:

    - the growing trend by telecommunications companies and electronics firms to
      outsource their manufacturing and divest of their manufacturing assets;

    - the impact the growth of the Internet is having on the development of
      faster and more powerful hardware, such as networking devices and servers;

    - the growing trend for Japanese-based companies to outsource manufacturing;
      and

    - the increasing number of acquisition opportunities in the area of EMS,
      including OEM divestitures.

                                       4

    Our industry is highly fragmented. In 2000, the four largest participants
(including us) accounted for approximately 54% of total industry revenue.
Because of the advantages of size and geographic diversity in servicing global
OEMs, our industry is poised for significant consolidation.

    Between the beginning of 1997 and May 7, 2001, we have completed
25 acquisitions. These acquisitions have significantly enhanced our geographic
reach, expanded our customer base of leading OEMs and broadened our service
offering capabilities. We continue to seek strategic acquisitions and
opportunities to establish greenfield operations.

    Our principal executive office is located at 12 Concorde Place, Toronto,
Ontario, Canada MC3 3R8 and our telephone number is (416) 448-5800.

                              ABOUT THE OFFERINGS

    We may offer subordinate voting shares, preference shares, secured or
unsecured general obligations of our company in the form of senior or
subordinated debt securities or warrants to purchase subordinate voting shares,
preference shares, debt securities or other securities, and our shareholders may
offer subordinate voting shares.

    Debt securities will consist of bonds, debentures, notes or other secured or
unsecured evidences of indebtedness. For each type of debt security we offer,
the price and terms will be determined at or prior to the time of sale.

    These securities may be offered directly to one or more purchasers, through
agents designated from time to time, or to or through underwriters or dealers.
The names of these parties, any securities to be purchased by or through these
parties, the compensation of these parties and other special terms in connection
with the offering and sale of these securities will be detailed in the
supplement to this prospectus. Please turn to "Plan of Distribution."

                                  RISK FACTORS

    The securities being offered by this prospectus involve a degree of risk.
You should carefully consider the following risk factors and all of the other
information contained in this prospectus, in the applicable prospectus
supplement and in the additional information described under the heading "Where
You Can Get More Information" before you buy any of the securities sold pursuant
to this prospectus.

OUR OPERATING RESULTS FLUCTUATE

    Our annual and quarterly results have fluctuated in the past. The reasons
for these fluctuations may similarly affect us in the future. Our operating
results may fluctuate in the future as a result of many factors, including:

    - The volume of orders received relative to our manufacturing capacity;

    - Fluctuations in material costs and the mix in material costs versus labor
      and manufacturing overhead costs;

    - Variations in the level and timing of orders placed by a customer due to
      the customer's attempts to balance its inventory, changes in the
      customer's manufacturing strategy and variation in demand for the
      customer's products. These changes can result from life cycles of customer
      products, competitive conditions and general economic conditions; and

    - The mix of revenue derived from consignment and turnkey manufacturing
      (consignment manufacturing, where the customer purchases materials, tends
      to result in higher gross margins but lower revenue, and turnkey
      manufacturing, where we purchase materials, tends to result in lower gross
      margins but higher revenue).

                                       5

    Any one of the following factors or combinations of these factors could also
affect our results for a financial period:

    - The level of price competition;

    - Our past experience in manufacturing a particular product;

    - The degree of automation we use in the assembly process;

    - Whether we are managing our inventories and fixed assets efficiently;

    - The timing of our expenditures in anticipation of increased sales;

    - Customer product delivery requirements and shortages of components or
      labor; and

    - The timing of, and the price we pay for, our acquisitions and related
      integration costs.

    In addition, most of our customers typically do not commit to firm
production schedules for more than 30 to 90 days in advance. Accordingly, we
cannot forecast the level of customer orders with certainty. This makes it
difficult to schedule production and maximize utilization of our manufacturing
capacity. In the past, we have been required to increase staffing, purchase
materials and incur other expenses to meet the anticipated demand of our
customers. Sometimes these anticipated orders from certain customers have failed
to materialize, and sometimes delivery schedules have been deferred as a result
of changes in the customer's business needs. On other occasions, customers have
required rapid and sudden increases in production which have placed an excessive
burden on our manufacturing capacity.

    Any of these factors or a combination of these factors could have a material
adverse effect on our results of operations.

    Historically, our fourth quarter revenue has been highest and our first
quarter revenue has been lowest. Prospective investors should not rely on
results of operations in any past period to indicate what our results will be
for any future period.

WE HAVE HAD RECENT OPERATING LOSSES

    We generated net earnings in each of the years from 1993 through 1996 and in
1999 and 2000. We recorded net losses of $6.9 million and $48.5 million in 1997
and 1998, respectively. In 1997, we incurred $13.3 million of integration costs
related to acquisitions and a $13.9 million credit loss, with these charges
totaling $27.2 million ($17.0 million after income taxes). In 1998, we incurred
$8.1 million of integration costs related to acquisitions, a $41.8 million
write-down of intellectual property and goodwill, a write-off of deferred
financing fees and debt redemption fees of $17.8 million and $5.1 million of
charges related to the acquisition of International Manufacturing Services,
Inc., or IMS, with these charges totaling $72.8 million ($56.5 million after
income taxes). We may not be profitable in future periods.

OUR RESULTS ARE AFFECTED BY CHANGES IN MATERIAL COSTS AND LIMITED AVAILABILITY
  OF COMPONENTS

    Substantially all of our revenue is derived from turnkey manufacturing. In
turnkey manufacturing, we purchase directly most or all of the components we
need for production and we assemble products. We typically bear a portion of the
risk of component price changes, which could have a material adverse effect on
our gross profit margin. Our results of operations have, under past practices,
been adversely affected by substantial component price reductions. A majority of
the products we manufacture require one or more components that we order from
sole-source suppliers of these particular components. Supply shortages for a
particular component can delay production of all products using that component
or cause price increases in the services we provide. In addition, at various
times there have been industry-wide shortages of electronic components. Such
shortages, or future fluctuations in material costs, may have a material adverse
effect on our business or cause our results of operations to fluctuate from
period to period. Also, we rely on a variety of common carriers for materials
transportation and route materials through various world ports. A work stoppage,
strike or shutdown of a major port or airport could result in manufacturing and
shipping delays or expediting charges, which could have a material adverse
effect on our results of operations.

                                       6

WE DEPEND ON CERTAIN INDUSTRIES

    Our financial performance depends on our customers' continued growth,
viability and financial stability. Our customers, in turn, substantially depend
on the growth of the computer and communications industries. These industries
are characterized by rapidly changing technologies and short product life
cycles. Recently these industries have experienced pricing and margin pressures.
These factors affecting the computer and communications industries in general,
and the impact these factors might have from time to time on our customers in
particular, could have a material adverse effect on our business.

WE DEPEND ON A LIMITED NUMBER OF CUSTOMERS

    Our two largest customers in 2000 were IBM and Sun Microsystems Inc., which
each represented more than 10% of our total 2000 revenue and collectively
represented 46% of our 2000 revenue. Our next five largest customers
collectively represented 32% of our total revenue in 2000. Our three largest
customers in 1999 were Hewlett-Packard Company, Sun Microsystems Inc. and Cisco
Systems Inc., which each represented more than 10% of our total 1999 revenue and
collectively represented 55% of our total 1999 revenue. Our next five largest
customers collectively represented 23% of our total revenue in 1999. We expect
to continue to depend upon a relatively small number of customers for a
significant percentage of our revenue.

    Generally, we do not enter into long-term supply commitments with our
customers. Instead, we bid on a project basis and have supply contracts in place
for each project. Significant reductions in sales to any of our largest
customers would have a material adverse effect on us. In addition, we generate
significant accounts receivable and inventory balances in connection with
providing manufacturing services to our customers. A customer's inability to pay
for the manufacturing services provided by us could have a material adverse
effect on our results of operations.

WE FACE RISKS DUE TO EXPANSION OF OUR OPERATIONS

    New operations, whether foreign or domestic, can require significant
start-up costs and capital expenditures. As we continue to expand our domestic
and international operations, we may not be able to successfully generate
revenue necessary to recover start-up and operating costs. The successful
operation of an acquired business requires effective communication and
cooperation between us and our new employees, including cooperation in product
development and marketing. This cooperation may not occur or a disruption in one
or more sectors of our business may result. In addition, we may not be able to
retain key technical, management, sales and other personnel of an acquired
business for any significant length of time, and we may not realize any of the
other anticipated benefits of an acquisition. Furthermore, additional
acquisitions would require investment of financial resources and may require
debt financing or dilutive equity financing. We may not consummate any
acquisitions in the future. If we do, any debt or equity financing required for
any acquisition may not be available on terms acceptable to us.

WE FACE ADDITIONAL RISKS DUE TO OUR INTERNATIONAL OPERATIONS

    During 2000, approximately 35% of our revenue was derived from locations
outside of North America. In addition, we purchased material from international
suppliers for much of our business, including our North American business. We
believe that our future growth depends in large part on our ability to increase
our business in international markets. We will continue to expand our operations
outside of North America. This expansion will require significant management
attention and financial resources. To increase international sales in subsequent
periods, we must establish additional foreign operations, hire additional
personnel and establish additional international facilities. We may not expand
or even maintain our international sales. If the revenue we generate from
foreign activities is inadequate to offset the expense of maintaining foreign
offices and activities, our profitability will be adversely affected.
International operations are subject to inherent risks, which may adversely
affect us, including:

    - Labor unrest;

    - Unexpected changes in regulatory requirements;

                                       7

    - Tariffs and other barriers;

    - Less favorable intellectual property laws;

    - Difficulties in staffing and managing foreign sales and support
      operations;

    - Longer accounts receivable payment cycles and difficulties in collecting
      payments;

    - Changes in local tax rates and other potentially adverse tax consequences,
      including the cost of repatriation of earnings;

    - Lack of acceptance of localized products in foreign countries;

    - Burdens of complying with a wide variety of foreign laws, including
      changing import and export regulations;

    - Adverse changes in Canadian and U.S. trade policies with the other
      countries in which we maintain operations; and

    - Political instability.

    The operations we acquired in the IMS acquisition in December 1998 are
subject to significant political, economic, legal and other uncertainties in
Hong Kong, China and Thailand. Under its current leadership, the Chinese
government has instituted a policy of economic reform which has included
encouraging foreign trade and investment and greater economic decentralization.
However, the Chinese government may discontinue or change these policies, and
these policies may not be successful. Moreover, despite progress in developing
its legal system, China does not have a comprehensive and highly developed
system of laws, particularly as it related to foreign investment activities and
foreign trade. Enforcement of existing and future laws and contracts is
uncertain, and implementation and interpretation of such laws may be
inconsistent. As the Chinese legal system develops, new laws and changes to
existing laws may adversely affect foreign operations in China. While Hong Kong
has had a long history of promoting foreign investment, its incorporation into
China means that the uncertainty related to China and its policies may now also
affect Hong Kong. Thailand has also had a long history of promoting foreign
investment but it has experienced economic turmoil and a significant devaluation
of its currency in the recent past. There is a risk that this period of economic
turmoil may result in the reversal of current policies encouraging foreign
investment and trade, restrictions on the transfer of funds overseas, employee
turnover, labor unrest or other domestic economic problems that could adversely
affect us.

WE FACE FINANCIAL RISKS DUE TO FOREIGN CURRENCY FLUCTUATIONS

    The principal currencies in which we conduct our operations are U.S.
dollars, Canadian dollars, Mexican pesos, British pounds sterling, Euros and
related currencies under the European Monetary Union, Thai baht and Brazilian
real. We may sometimes enter into hedging transactions to minimize our exposure
to foreign currency and interest rate risks. Our current hedging activity is
designed to reduce the variability of our foreign currency costs and consists of
contracts to sell U.S. dollars and to purchase Canadian dollars, British pounds
sterling, Mexican pesos, Euros and Thai baht at future dates. In general, these
contracts extend for periods of less than 18 months. Our hedging transactions
may not successfully minimize foreign currency risk.

WE DEPEND ON HIGHLY SKILLED PERSONNEL

    Recruiting personnel for the EMS industry is highly competitive. We believe
that our future success will depend, in part, on our ability to continue to
attract and retain highly skilled executive, technical and management personnel.
We generally do not have employment or non-competition agreements with our
employees. To date we have been successful in recruiting and retaining
executive, managerial and technical personnel. However, the loss of services of
certain of these employees could have a material adverse effect on us.

                                       8

WE ARE IN A HIGHLY COMPETITIVE INDUSTRY

    We are in a highly competitive industry. We compete against numerous
domestic and foreign companies. Three of our competitors, Solectron Corporation,
SCI Systems, Inc. and Flextronics International, each have annual revenues in
excess of $5 billion. We also face indirect competition from the manufacturing
operations of our current and prospective customers, which continually evaluate
the merits of manufacturing products internally rather than using EMS providers.
Some of our competitors have more geographically diversified international
operations, as well as substantially greater manufacturing, financial,
procurement, research and development and marketing resources than we have.
These competitors may create alliances and rapidly acquire significant market
share. Accordingly, our current or potential competitors may develop or acquire
services comparable or superior to those we develop, combine or merge to form
significant competitors, or adapt more quickly than we will to new technologies,
evolving industry trends and changing customer requirements. Competition could
cause price reductions, reduced profits or losses or loss of market share, any
of which could materially and adversely affect us. We may not be able to compete
successfully against current and future competitors and the competitive
pressures that we face may materially adversely affect us.

WE MAY BE UNABLE TO KEEP PACE WITH PROCESS AND TEST DEVELOPMENT CHANGE

    We continue to evaluate the advantages and feasibility of new manufacturing
processes. Our future success will depend in part upon our ability to develop
and to market manufacturing services which meet changing customer needs, to
maintain technological leadership and to successfully anticipate or respond to
technological changes in manufacturing processes in cost-effective and timely
ways. Our process and test development efforts may not be successful.

OUR CUSTOMERS MAY BE ADVERSELY AFFECTED BY RAPID TECHNOLOGICAL CHANGE

    Our customers compete in markets that are characterized by rapidly changing
technology, evolving industry standards and continuous improvements in products
and services. These conditions frequently result in short product life cycles.
Our success will depend largely on the success achieved by our customers in
developing and marketing their products. If technologies or standards supported
by our customers' products become obsolete or fail to gain widespread commercial
acceptance, our business could be materially adversely affected.

WE MAY BE UNABLE TO PROTECT OUR INTELLECTUAL PROPERTY

    We believe that certain of our proprietary intellectual property rights and
information give us a competitive advantage. Accordingly, we have taken, and
intend to continue to take, appropriate steps to protect this proprietary
information. These steps include signing non-disclosure agreements with
customers, suppliers, employees and other parties and implementing rigid
security measures. Our protection measures may not be sufficient to prevent the
misappropriation or unauthorized disclosure of our property or information.

    There is also a risk that infringement claims may be brought against us or
our customers in the future. If someone does successfully assert an infringement
claim, we may be required to spend significant time and money to develop a
manufacturing process that does not infringe upon the rights of such other
person or to obtain licenses for the technology, process or information from the
owner. We may not be successful in such development or any such licenses may not
be available on commercially acceptable terms, if at all. In addition, any
litigation could be lengthy and costly and could adversely affect us even if we
are successful in such litigation.

OUR COMPLIANCE WITH ENVIRONMENTAL LAWS COULD BE COSTLY

    Like others in similar businesses, we are subject to extensive environmental
laws and regulations in numerous jurisdictions. Our environmental policies and
practices have been designed to ensure compliance with these laws and
regulations consistent with local practice. Future developments and increasingly
stringent regulation could require us to make additional expenditures relating
to environmental matters at any of the facilities. Achieving and maintaining
compliance with present and changing future environmental laws could

                                       9

restrict our ability to modify or expand our facilities or continue production.
This compliance could also require us to acquire costly equipment or to incur
other significant expenses.

    Some of our operating sites have a history of industrial use. Soil and
groundwater contamination have occurred at some of our facilities, including our
Toronto site. Certain environmental laws impose liability for the costs of
removal or remediation of hazardous or toxic substances on an owner, occupier or
operator of real estate, even if such person or company was not aware of or
responsible for the presence of such substances. In addition, any person or
company who arranges for the disposal or treatment of hazardous or toxic
substances at a disposal or treatment facility may be liable for the costs of
removal or remediation of such substances at such facility, whether or not the
person or company owns or operates the facility. Pursuant to these environmental
laws, from time to time we investigate, remediate and monitor soil and
groundwater contamination at certain of our operating sites and we are currently
remediating contamination at the Toronto site. Also, we may undertake limited
compliance-related activities at some of our recently acquired facilities,
particularly in Asia.

    We obtained Phase I or similar environmental assessments for most of the
manufacturing facilities that we own or lease at the time we either acquired or
leased such facilities, or reviewed recent assessments initiated by others.
Typically, these assessments include general inspections without soil sampling
or ground water analysis. The assessments have not revealed any environmental
liability that, based on current information, we believe will have a material
adverse effect on us. Nevertheless, our assessment may not reveal all
environmental liabilities and current assessments are not available for all
facilities. Consequently, there may be material environmental liabilities we are
not aware of. In addition, ongoing clean up and containment operations may not
be adequate for purposes of future laws. The conditions of our properties could
be affected in the future by the conditions of the land or operations in the
vicinity of the properties (such as the presence of underground storage tanks).
These developments and others (such as increasingly stringent environmental
laws, increasingly strict enforcement of environmental laws by governmental
authorities, or claims for damage to property or injury to persons resulting
from the environmental, health or safety impact of our operations) may cause us
to incur significant costs and liabilities that could have a material adverse
effect on us.

OUR LOAN AGREEMENTS CONTAIN RESTRICTIVE COVENANTS

    Certain of our outstanding loan agreements contain financial and operating
covenants that limit our management's discretion with respect to certain
business matters. Among other things, these covenants restrict our ability and
our subsidiaries' ability to incur additional debt, create liens or other
encumbrances, make certain payments (including dividends) and investments, sell
or otherwise dispose of assets and merge or consolidate with other entities.

OUR COMPANY IS CONTROLLED BY ONEX CORPORATION

    Onex Corporation, or Onex, owns, directly or indirectly, all of the multiple
voting shares and approximately 1.1% of the outstanding subordinate voting
shares. The number of shares owned by Onex, together with those shares Onex has
the right to vote, represent 86.0% of the voting interest in our company and
include 2.9% of the outstanding subordinate voting shares. Accordingly, Onex
exercises a controlling influence over our business and affairs and has the
power to determine all matters submitted to a vote of our shareholders where our
shares vote together as a single class. Onex has the power to elect our
directors and to approve significant corporate transactions such as certain
amendments to our articles of incorporation, mergers, amalgamations, plans of
arrangement and the sale of all or substantially all of our assets. Onex's
voting power could have the effect of deterring or preventing a change in
control of our company that might otherwise be beneficial to our other
shareholders. Under our revolving credit facilities, if Onex ceases to control
Celestica, our lenders could demand repayment. Gerald W. Schwartz, the Chairman,
President and Chief Executive Officer of Onex and one of our directors, owns
shares with a majority of the voting rights of the shares of Onex.
Mr. Schwartz, therefore, effectively controls our affairs.

    In private placements outside of the United States, certain subsidiaries of
Onex have offered exchangeable debentures due 2025 that are exchangeable and
redeemable under certain circumstances during

                                       10

their 25-year term for an aggregate 9,214,320 subordinate voting shares of
Celestica. In addition, 1,757,467 subordinate voting shares may be delivered, at
the option of Onex or certain persons related to Onex, to satisfy the
obligations of such persons under equity forward agreements. If the issuers of
the exchangeable debentures elect or the party to the equity forward agreements
elects to deliver solely subordinate voting shares and no cash upon the exchange
or redemption, or at maturity or acceleration, of the debentures or the
settlement of the equity forward agreements, as the case may be, the number of
shares owned by Onex, together with those shares Onex has the right to vote,
would, if such delivery had occurred on April 15, 2001, represent in the
aggregate 81.4% of the voting interest in our company and 1.7% of our
outstanding subordinate voting shares.

POTENTIAL UNENFORCEABILITY OF CIVIL LIABILITIES AND JUDGMENTS

    We are incorporated under the laws of the Province of Ontario, Canada. Most
of our directors, controlling persons and officers and certain of the experts
named in this prospectus are residents of Canada. Also, a substantial portion of
our assets and the assets of these persons are located outside of the United
States. As a result, it may be difficult for shareholders to initiate a lawsuit
within the United States against these non-U.S. residents, or to enforce
judgments in the United States against us or these persons which are obtained in
a U.S. court. It may also be difficult for shareholders to enforce a U.S.
judgment in Canada or to succeed in a lawsuit in Canada based only on U.S.
securities laws.

                                USE OF PROCEEDS

    Unless we tell you otherwise in an accompanying prospectus supplement, we
will use the net proceeds from the sale of the securities for general corporate
purposes. From time to time we evaluate the acquisition of businesses, products
and technologies and a portion of the net proceeds may be used for such
acquisitions. We will not receive any proceeds from the sale of subordinate
voting shares by any selling shareholders.

                CONSOLIDATED RATIO OF EARNINGS TO FIXED CHARGES

    This table sets forth our consolidated ratio of earnings to fixed charges
for the periods indicated:



                                                                       FISCAL YEAR ENDED DECEMBER 31,
                                                            ----------------------------------------------------
                                                              1996       1997       1998       1999       2000
                                                            --------   --------   --------   --------   --------
                                                                                         
Ratio of earnings to fixed charges (unaudited) (1)........    4.30x      0.90x      0.07x      5.05x      9.27x
Deficiency of earnings available to cover fixed charges
  ($millions).............................................       --     $  4.7     $ 50.5         --         --


------------------------

(1) For the purposes of calculating the ratio of earnings to fixed charges and
    the deficiency, if any, of earnings available to cover fixed charges,
    (i) "earnings" means the sum of (a) income before taxes and (b) fixed
    charges during the period and (ii) "fixed charges" means the sum of
    (a) interest expensed, (b) amortized premiums, discounts and capitalized
    expenses related to indebtedness and (c) an estimate of the interest
    included in rental expense. The ratio of earnings to fixed charges is
    calculated by dividing earnings by fixed charges. Celestica has not
    capitalized interest during any of the periods reflected in the table. These
    computations include Celestica and our subsidiaries.

    If we use this prospectus to offer debt securities or preference shares, the
prospectus supplement will include a ratio of earnings to fixed charges or a
ratio of combined fixed charges and preference dividends to earnings, as
appropriate.

                                       11

                      WHERE YOU CAN FIND MORE INFORMATION

    We file annual, quarterly and special reports and other information with the
Securities and Exchange Commission. In addition, Celestica files such reports
with the Canadian securities authorities (the "CSAs"). As a foreign private
issuer, Celestica is exempt from the rules and regulations under the Exchange
Act prescribing certain disclosure and procedural requirements for proxy
solicitations and, with respect to their purchases and sales of Celestica
securities, Celestica's officers, directors and principal shareholders are
exempt from the reporting and "short swing" profit recovery provisions contained
in Section 16 of the Exchange Act and the rules and regulations thereunder.

    You may read and copy any document we file at the Commission's public
reference room at 450 Fifth Street, N.W., Washington, D.C. 20549. Please call
the Commission at 1-800-SEC-0330 for further information on the operation of the
Commission's public reference room. You are also invited to read and copy any
reports, statements or other information that Celestica files with the CSAs at
the respective CSAs' public reference rooms. The Quebec Securities Commission's
public reference room is located in Montreal, Quebec. These Celestica filings
are also electronically available to the public over the Internet at the
Commission's World Wide Web site at http://www.sec.gov and the Canadian System
for Electronic Document Analysis and Retrieval ("SEDAR"), the Canadian
equivalent of the Commission's electronic document gathering and retrieval
system. Our subordinate voting shares are listed on The New York Stock Exchange
and The Toronto Stock Exchange under the trading symbol "CLS." You can also
obtain information about us from the New York Stock Exchange at 20 Broad Street,
New York, New York 10005.

    The Commission allows us to "incorporate by reference" the information we
file with them. This means that we can disclose important information to you by
referring you to those documents. The information incorporated by reference is
an important part of this prospectus and information that we file later with the
Commission will automatically update and supersede this information. We
incorporate by reference our Annual Report on Form 20-F for the year ended
December 31, 2000, our Current Reports on Form 6-K for March 2001, April 2001
and May 2001 and any future filings made with the Commission under the Exchange
Act on Form 20-F, Form 40-F, Form 10-K, Form 10-Q and Form 8-K, from the date
these documents are filed until we sell all of these securities. We also
incorporate by reference any Form 6-K we file in the future with the Commission
unless we state in the Form 6-K that it is not incorporated by reference into
this prospectus.

    You may request a copy of these filings at no cost, by writing or calling us
at the following address:

    Celestica Inc.
    12 Concorde Place
    Toronto, Ontario M3C 3R8
    (416) 448-5800
    Attention: Investor Relations

    You should rely only on the information incorporated by reference or
provided in this prospectus or any prospectus supplement. We have not authorized
anyone to provide you with different information. We are not making an offer of
these securities in any state where the offer is not permitted. You should not
assume that the information in this prospectus or any prospectus supplement is
accurate as of any date other than the date on the front of those documents.

                                       12

                              PLAN OF DISTRIBUTION

    We may sell the securities separately or together:

    - to one or more underwriters or dealers for public offering and sale by
      them;

    - directly to investors; or

    - through agents.

    We may price any of the securities at:

    - a fixed price or prices, which may be changed from time to time;

    - market prices prevailing at the times of sale;

    - prices related to prevailing market prices; or

    - negotiated prices.

    We will describe the method of distribution of the securities in the
prospectus supplement.

BY AGENTS

    The securities may be sold through agents designated by us. Any agent
involved will be named, and any commissions payable by us to such agent will be
set forth, in the applicable prospectus supplement.

BY UNDERWRITERS OR DEALERS

    If underwriters are used in the sale, the securities will be acquired by the
underwriters for their own account and may be resold from time to time in one or
more transactions, including negotiated transactions, at a fixed public offering
price or at varying prices determined at the time of sale. The underwriter or
underwriters with respect to a particular underwritten offering of securities,
or, if an underwriting syndicate is used, the managing underwriter or
underwriters, will be set forth on the cover of the applicable prospectus
supplement. Unless otherwise set forth in the prospectus supplement relating
thereto, the obligations of the underwriters to purchase the securities will be
subject to certain conditions and the underwriters will be obligated to purchase
all of the securities if any are purchased. Any public offering price and any
discounts or concessions allowed or reallowed or paid to dealers may be changed
from time to time.

    If dealers are used, and if so specified in the applicable prospectus
supplement, we will sell such securities to the dealers as principals. The
dealers may then resell such securities to the public at varying prices to be
determined by such dealers at the time of resale. The names of the dealers and
the terms of any such transaction will be set forth in the applicable prospectus
supplement.

DIRECT SALES

    Securities may also be sold directly by us. In this case, no underwriters,
dealers or agents would be involved.

SELLING SHAREHOLDERS

    Any selling shareholder may offer subordinate voting shares using any of the
methods described above, through agents, underwriters, dealers or in direct
sales. The applicable prospectus supplement will describe the selling
shareholder's method of distribution, will name any agent, underwriter or dealer
of the selling shareholder and will describe the compensation to be paid to any
of these parties.

GENERAL INFORMATION

    We may enter into agreements with underwriters, dealers and agents that
entitle them to indemnification against certain civil liabilities, including
liabilities under the Securities Act, or to contribution with respect to
payments which the underwriters, dealers or agents may be required to make.
Underwriters,

                                       13

dealers and agents may be customers of, may engage in transactions with, or
perform services for, us or our subsidiaries in the ordinary course of business.

    Underwriters, dealers and agents that participate in the distribution of the
securities may be underwriters as defined in the Securities Act, and any
discounts or commissions received by them from us and any profit on the resale
of the securities by them may be treated as underwriting discounts and
commissions under the Securities Act. Any underwriters, dealers or agents used
in the offer or sale of securities will be identified and their compensation
described in an applicable prospectus supplement.

                          DESCRIPTION OF CAPITAL STOCK

GENERAL

    Our authorized capital consists of an unlimited number of preference shares
issuable in series, an unlimited number of subordinate voting shares and an
unlimited number of multiple voting shares. At April 15, 2001, no preference
shares, 164,811,377 subordinate voting shares and 39,065,950 multiple voting
shares were issued and outstanding.

MULTIPLE VOTING SHARES AND SUBORDINATE VOTING SHARES

    VOTING RIGHTS

    The holders of subordinate voting shares and multiple voting shares are
entitled to notice of and to attend all meetings of shareholders and to vote at
all such meetings together as a single class, except in respect of matters where
only the holders of shares of one class or series of shares are entitled to vote
separately pursuant to applicable law. The subordinate voting shares carry one
vote per share and the multiple voting shares carry 25 votes per share.
Generally, all matters to be voted on by shareholders must be approved by a
simple majority (or, in the case of election of directors, by a plurality, and
in the case of an amalgamation or amendments to the articles of the Company, by
two-thirds) of the votes cast in respect of multiple voting shares and
subordinate voting shares held by persons present in person or by proxy, voting
together as a single class. The holders of multiple voting shares are entitled
to one vote per share held at meetings of holders of multiple voting shares at
which they are entitled to vote separately as a class.

    DIVIDENDS

    The subordinate voting shares and the multiple voting shares are entitled to
share ratably, as a single class, in any dividends declared by the board of
directors of the Company, subject to any preferential rights of any outstanding
preference shares in respect of the payment of dividends. Dividends consisting
of subordinate voting shares and multiple voting shares may be paid only as
follows: (i) subordinate voting shares may be paid only to holders of
subordinate voting shares, and multiple voting shares may be paid only to
holders of multiple voting shares; and (ii) proportionally with respect to each
outstanding subordinate voting share and multiple voting share.

    CONVERSION

    Each multiple voting share is convertible at any time at the option of the
holder thereof into one subordinate voting share.

    Multiple voting shares will be converted automatically into subordinate
voting shares upon any transfer thereof, except (i) a transfer to Onex or any
affiliate of Onex or (ii) a transfer of 100% of the outstanding multiple voting
shares to a purchaser who also has offered to purchase all of the outstanding
subordinate voting shares for a per share consideration identical to, and
otherwise on the same terms as, that offered for the multiple voting shares and
the multiple voting shares held by such purchaser thereafter shall be subject to
the provisions relating to conversion as if all references to Onex were
references to such purchaser. In addition, if (i) any holder of any multiple
voting shares ceases to be an affiliate of Onex or (ii) Onex and its affiliates
cease to have the right, in all cases, to exercise the votes attached to, or to
direct the voting of, any of the multiple voting shares held by Onex and its
affiliates, such multiple voting shares shall convert automatically into
subordinate voting shares on a one-for-one basis. For these purposes,
(i) "Onex" includes

                                       14

any successor corporation resulting from an amalgamation, merger, arrangement,
sale of all or substantially all of its assets, or other business combination or
reorganization involving Onex, provided that such successor corporation
beneficially owns directly or indirectly all multiple voting shares beneficially
owned directly or indirectly by Onex immediately prior to such transaction and
is controlled by the same person or persons as controlled Onex prior to the
consummation of such transaction; (ii) a corporation shall be deemed to be a
subsidiary of another corporation if, but only if (a) it is controlled by that
other, or that other and one or more corporations each of which is controlled by
that other, or two or more corporations each of which is controlled by that
other, or (b) it is a subsidiary of a corporation that is that other's
subsidiary; (iii) "affiliate" means a subsidiary of Onex or a corporation
controlled by the same person or company that controls Onex; and (iv) "control"
means beneficial ownership of, or control or direction over, securities carrying
more than 50% of the votes that may be cast to elect directors if those votes,
if cast, could elect more than 50% of the directors. For these purposes, a
person is deemed to beneficially own any security which is beneficially owned by
a corporation controlled by such person.

    In addition, if at any time the number of outstanding multiple voting shares
shall represent less than 5% of the aggregate number of the outstanding multiple
voting shares and subordinate voting shares, all of the outstanding multiple
voting shares shall be automatically converted at such time into subordinate
voting shares on a one-for-one basis.

    Onex, which owns all of the outstanding multiple voting shares, has entered
into an agreement with Computershare Trust Company of Canada, as trustee for the
benefit of the holders of the subordinate voting shares, that has the effect of
preventing transactions that otherwise would deprive the holders of subordinate
voting shares of rights under applicable provincial take-over bid legislation to
which they would have been entitled in the event of a take-over bid for the
multiple voting shares if the multiple voting shares had been subordinate voting
shares.

    MODIFICATION, SUBDIVISION AND CONSOLIDATION

    Any modification to the provisions attaching to either the subordinate
voting shares or the multiple voting shares requires the separate affirmative
vote of two-thirds of the votes cast by the holders of subordinate voting shares
and multiple voting shares, respectively, voting as separate classes. The
Company may not subdivide or consolidate the subordinate voting shares or the
multiple voting shares without at the same time proportionally subdividing or
consolidating the shares of the other class.

    CREATION OF OTHER VOTING SHARES

    The Company may not create any class or series of shares, or issue any
shares of any class or series (other than subordinate voting shares) having the
right to vote generally on all matters that may be submitted to a vote of
shareholders (except matters for which applicable law requires the approval of
holders of another class or series of shares voting separately as a class or
series) without the separate affirmative vote of two-thirds of the votes cast by
the holders of the subordinate voting shares and the multiple voting shares,
respectively, voting as separate classes.

    RIGHTS ON DISSOLUTION

    With respect to a distribution of assets in the event of a liquidation,
dissolution or winding-up of the Company, whether voluntary or involuntary, or
any other distribution of the assets of the Company for the purposes of winding
up its affairs, holders of subordinate voting shares and multiple voting shares
will share ratably as a single class in assets available for distribution to
holders of subordinate voting shares and multiple voting shares after payment in
full of the amounts required to be paid to holders of preference shares,
if any.

    OTHER RIGHTS

    Neither the subordinate voting shares nor the multiple voting shares will be
redeemable nor will the holders of such shares have pre-emptive rights to
purchase additional shares.

                                       15

CERTAIN CANADIAN FEDERAL INCOME TAX CONSIDERATIONS

    The following is a summary of the material Canadian federal income tax
considerations generally applicable to a person (a "U.S. Holder"), who acquires
subordinate voting shares and who, for purposes of the Income Tax Act (Canada)
(the "Canadian Tax Act") and the Canada-United States Income Tax Convention
(1980) (the "Tax Treaty"), at all relevant times, is resident in the United
States and is neither resident nor deemed to be resident in Canada, deals at
arm's length and is not affiliated with the Company, holds such subordinate
voting shares as capital property, and does not use or hold, and is not deemed
to use or hold, the subordinate voting shares in carrying on business in Canada.
Special rules, which are not discussed in this summary, may apply to a U.S.
Holder that is an insurer that carries on an insurance business in Canada and
elsewhere.

    This summary is based on the current provisions of the Tax Treaty, the
Canadian Tax Act and the regulations thereunder, all specific proposals to amend
the Canadian Tax Act or the regulations publicly announced by the Minister of
Finance (Canada) prior to the date hereof, and the Company's understanding of
the current published administrative practices of the Canada Customs and Revenue
Agency.

    This summary is not exhaustive of all possible Canadian federal income tax
considerations and, except as mentioned above, does not take into account or
anticipate any changes in law, whether by legislative, administrative or
judicial decision or action, nor does it take into account the tax legislation
or considerations of any province or territory of Canada or any jurisdiction
other than Canada.

    THIS SUMMARY IS OF A GENERAL NATURE ONLY AND IS NOT INTENDED TO BE, NOR
SHOULD IT BE CONSTRUED TO BE, LEGAL OR TAX ADVICE TO ANY PARTICULAR HOLDER, AND
NO REPRESENTATION WITH RESPECT TO THE CANADIAN FEDERAL INCOME TAX CONSEQUENCES
TO ANY PARTICULAR HOLDER IS MADE. CONSEQUENTLY, U.S. HOLDERS OF SUBORDINATE
VOTING SHARES SHOULD CONSULT THEIR OWN TAX ADVISORS WITH RESPECT TO THE INCOME
TAX CONSEQUENCES TO THEM HAVING REGARD TO THEIR PARTICULAR CIRCUMSTANCES.

    All amounts relevant in computing a U.S. Holder's liability under the
Canadian Tax Act are to be computed in Canadian dollars.

    TAXATION OF DIVIDENDS

    By virtue of the Canadian Tax Act and the Tax Treaty, dividends (including
stock dividends) on subordinate voting shares paid or credited or deemed to be
paid or credited to a U.S. Holder who is the beneficial owner of such dividend
will be subject to Canadian non-resident withholding tax at the rate of 15% of
the gross amount of such dividends. Under the Tax Treaty, the rate of
withholding tax on dividends is reduced to 5% if that U.S. Holder is a company
that beneficially owns at least 10% of the voting stock of the Company.
Moreover, under the Tax Treaty, dividends paid to certain religious, scientific,
literary, educational or charitable organizations that are resident in, and
exempt from tax on the dividends in, the U.S. and to certain pension
organizations that are resident in, and generally exempt from tax in, the U.S.,
are exempt from Canadian non-resident withholding tax. Provided that certain
administrative procedures are observed by such an organization, the Company
would not be required to withhold such tax from dividends paid or credited to
such organization.

    DISPOSITION OF SUBORDINATE VOTING SHARES

    A U.S. Holder will not be subject to tax under the Canadian Tax Act in
respect of any capital gain realized on the disposition or deemed disposition of
subordinate voting shares unless the subordinate voting shares constitute or are
deemed to constitute "taxable Canadian property" (as defined in the Canadian Tax
Act) (other than treaty-protected property, as defined in the Canadian Tax Act)
at the time of such disposition. Shares of a corporation resident in Canada that
are listed on a prescribed stock exchange for purposes of the Canadian Tax Act
will be "taxable Canadian property" under the Canadian Tax Act if, at any time
during the five-year period immediately preceding the disposition or deemed
disposition of the share, the non-resident, persons with whom the non-resident
did not deal at arm's length, or the non-resident together with such persons,
owned 25% or more of the issued shares of any class or series of shares of the
corporation that issued the shares. For this purpose, a person is considered to
own any shares in respect of

                                       16

which the person has or had an option or other interest therein. Provided they
are listed on a prescribed stock exchange for purposes of the Canadian Tax Act,
subordinate voting shares acquired by a U.S. Holder generally will not be
taxable Canadian property to a U.S. Holder unless the foregoing 25% ownership
threshold applies to the U.S. Holder with respect to the Company. Even if the
subordinate voting shares are taxable Canadian property to a U.S. Holder, they
generally will be treaty-protected property if the value of such shares at the
time of disposition is not derived principally from real property situated in
Canada. Consequently, any gain realized by the U.S. Holder upon the disposition
of the subordinate voting shares generally will be exempt from tax under the
Canadian Tax Act.

CERTAIN UNITED STATES FEDERAL INCOME TAX CONSIDERATIONS

    The following discussion describes the material United States federal income
tax consequences to United States Holders (as defined below) of subordinate
voting shares. A United States Holder is a citizen or resident of the United
States, a corporation, partnership or other entity created or organized in or
under the laws of the United States or of any political subdivision thereof, an
estate, the income of which is includible in gross income for U.S. federal
income tax purposes regardless of its source, or a trust, if either (i) a court
within the U.S. is able to exercise primary supervision over the administration
of the trust and one or more U.S. persons have the authority to control all
substantial decisions of the trust or (ii) the trust has made an election under
applicable U.S. Treasury regulations to be treated as a U.S. Person. This
summary is for general information purposes only. It does not purport to be a
comprehensive description of all of the tax considerations that may be relevant
to your decision to purchase subordinate voting shares. This summary considers
only United States Holders who will own subordinate voting shares as capital
assets within the meaning of Section 1221 of the Internal Revenue Code of 1986,
as amended (the "Internal Revenue Code"). In this context, the term "capital
assets" means, in general, assets held for investment by a taxpayer. Material
aspects of U.S. federal income tax relevant to non-United States Holders are
also discussed below.

    This discussion is based on current provisions of the Internal Revenue Code,
current and proposed Treasury regulations promulgated thereunder and
administrative and judicial decisions as of the date hereof, all of which are
subject to change, possibly on a retroactive basis. This discussion does not
address all aspects of U.S. federal income taxation that may be relevant to any
particular United States Holder based on the United States Holder's individual
circumstances. In particular, this discussion does not address the potential
application of the alternative minimum tax or U.S. federal income tax
consequences to United States Holders who are subject to special treatment,
including taxpayers who are broker-dealers or insurance companies, taxpayers who
have elected mark-to-market accounting, individual retirement and other
tax-deferred accounts, tax-exempt organizations, financial institutions or
"financial services entities," taxpayers who hold subordinate voting shares as
part of a straddle, "hedge" or "conversion transaction" with other investments,
taxpayers owning directly, indirectly or by attribution at least 10% of the
voting power of our share capital, and taxpayers whose functional currency (as
defined in Section 985 of the Internal Revenue Code) is not the U.S. dollar.

    This discussion does not address any aspect of U.S. federal gift or estate
tax or state, local or non-U.S. tax laws. Additionally, the discussion does not
consider the tax treatment of persons who hold subordinate voting shares through
a partnership or other pass-through entity. You are advised to consult your own
tax advisor with respect to the specific tax consequences to you of purchasing,
holding or disposing of the subordinate voting shares.

    TAXATION OF DIVIDENDS PAID ON SUBORDINATE VOTING SHARES

    In the event that we pay a dividend, and subject to the discussion of the
passive foreign investment company (PFIC) rules below, a United States Holder
will be required to include in gross income as ordinary income the amount of any
distribution paid on subordinate voting shares, including any Canadian taxes
withheld from the amount paid, on the date the distribution is received, to the
extent that the distribution is paid out of our current or accumulated earnings
and profits as determined for U.S. federal income tax purposes. In addition,
distributions of our current or accumulated earnings and profits will be foreign
source passive income for U.S. foreign tax credit purposes and will not qualify
for the dividends-received deduction

                                       17

available to corporations. Distributions in excess of such earnings and profits
will be applied against and will reduce the United States Holder's tax basis in
the subordinate voting shares and, to the extent in excess of such basis, will
be treated as capital gain.

    Distributions of current or accumulated earnings and profits paid in
Canadian dollars to a United States Holder will be includible in the income of
the United States Holder in a dollar amount calculated by reference to the
exchange rate on the date the distribution is received. A United States Holder
who receives a distribution of Canadian dollars and converts the Canadian
dollars into U.S. dollars subsequent to receipt will have foreign exchange gain
or loss based on any appreciation or depreciation in the value of the Canadian
dollar against the U.S. dollar. Such gain or loss will generally be ordinary
income and loss and will generally be U.S. source gain or loss for U.S. foreign
tax credit purposes. United States Holders should consult their own tax advisors
regarding the treatment of a foreign currency gain or loss.

    United States Holders will generally have the option of claiming the amount
of any Canadian income taxes withheld either as a deduction from gross income or
as a dollar-for-dollar credit against their U.S. federal income tax liability,
subject to specified conditions and limitations. Individuals who do not claim
itemized deductions, but instead utilize the standard deduction, may not claim a
deduction for the amount of the Canadian income taxes withheld, but these
individuals generally may still claim a credit against their U.S. federal income
tax liability. The amount of foreign income taxes that may be claimed as a
credit in any year is subject to complex limitations and restrictions, which
must be determined on an individual basis by each shareholder. The total amount
of allowable foreign tax credits in any year cannot exceed the pre-credit U.S.
tax liability for the year attributable to some foreign source taxable income. A
United States Holder will be denied a foreign tax credit with respect to
Canadian income tax withheld from dividends received on subordinate voting
shares to the extent that he has not held the subordinate voting shares for at
least 16 days of the 30-day period beginning on the date which is 15 days before
the ex-dividend date or to the extent that he or she is under an obligation to
make related payments with respect to substantially similar or related property.
Instead, a deduction may be allowed. Any days during which a United States
Holder has substantially diminished his or her risk of loss on his or her
subordinate voting shares are not counted toward meeting the 16-day holding
period.

    TAXATION OF DISPOSITION OF SUBORDINATE VOTING SHARES

    Subject to the discussion of the PFIC rules below, upon the sale, exchange
or other disposition of subordinate voting shares, a United States Holder will
recognize capital gain or loss in an amount equal to the difference between his
or her adjusted tax basis in his or her shares and the amount realized on the
disposition. A United States Holder that uses the cash method of accounting
calculates the dollar value of the proceeds received on the sale date as of the
date that the sale settles, while a United States Holder who uses the accrual
method of accounting is required to calculate the value of the proceeds of the
sale as of the "trade date," unless he or she has elected to use the settlement
date to determine his or her proceeds of sale. Capital gain from the sale,
exchange or other disposition of shares held more than one year is long-term
capital gain and is eligible for a maximum 20% rate of taxation for individuals.
Special rules (and generally lower maximum rates) apply to individuals in lower
tax brackets. Further preferential tax treatment may be available for
individuals who dispose of subordinate voting shares held for over five years.
Gain or loss recognized by a United States Holder on a sale, exchange or other
disposition of subordinate voting shares generally will be treated as
U.S. source income or loss for U.S. foreign tax credit purposes. The
deductibility of a capital loss recognized on the sale, exchange or other
disposition of subordinate voting shares is subject to limitations. A United
States Holder who receives foreign currency upon disposition of subordinate
voting shares and converts the foreign currency into U.S. dollars subsequent to
receipt will have foreign exchange gain or loss based on any appreciation or
depreciation in the value of the foreign currency against the U.S. dollar.
United States Holders should consult their own tax advisors regarding the
treatment of a foreign currency gain or loss.

    TAX CONSEQUENCES IF WE ARE A PASSIVE FOREIGN INVESTMENT COMPANY

    A non-U.S. corporation will be a PFIC if, in general, either (i) 75% or more
of its gross income in a taxable year, including the pro rata share of the gross
income of any U.S. or foreign company in which it is

                                       18

considered to own 25% or more of the shares by value, is passive income or
(ii) 50% or more of its assets in a taxable year, averaged over the year and
ordinarily determined based on fair market value and including the pro rata
share of the assets of any company in which it is considered to own 25% or more
of the shares by value, are held for the production of, or produce, passive
income. Passive income includes amounts derived by reason of the temporary
investment of funds raised in a public offering. If we were a PFIC and, a United
States Holder did not make an election to treat the company as a "qualified
electing fund" and did not make a mark-to-market election, each as described
below, then:

    - Excess distributions by us to a United States Holder would be taxed in a
      special way. "Excess distributions" are amounts received by a United
      States Holder with respect to subordinate voting shares in any taxable
      year that exceed 125% of the average distributions received by the United
      States Holder from the company in the shorter of either the three previous
      years or his or her holding period for his or her shares before the
      present taxable year. Excess distributions must be allocated ratably to
      each day that a United States Holder has held subordinate voting shares. A
      United States Holder must include amounts allocated to the current taxable
      year and to any non-PFIC years in his or her gross income as ordinary
      income for that year. A United States Holder must pay tax on amounts
      allocated to each prior taxable PFIC year at the highest rate in effect
      for that year on ordinary income and the tax is subject to an interest
      charge at the rate applicable to deficiencies for income tax.

    - The entire amount of gain that is realized by a United States Holder upon
      the sale or other disposition of shares will also be considered an excess
      distribution and will be subject to tax as described above.

    - A United States Holder's tax basis in shares that were acquired from a
      decedent will not receive a step-up to fair market value as of the date of
      the decedent's death but instead will be equal to the decedent's tax
      basis, if lower.

    The special PFIC rules will not apply to a United States Holder if the
United States Holder makes an election to treat the company as a "qualified
electing fund" in the first taxable year in which he or she owns subordinate
voting shares and if we comply with reporting requirements. Instead, a
shareholder of a qualified electing fund is required for each taxable year to
include in income a pro rata share of the ordinary earnings of the qualified
electing fund as ordinary income and a pro rata share of the net capital gain of
the qualified electing fund as long-term capital gain, subject to a separate
election to defer payment of taxes, which deferral is subject to an interest
charge. We have agreed to supply United States Holders with the information
needed to report income and gain pursuant to this election in the event that we
are classified as a PFIC. The election is made on a shareholder-by-shareholder
basis and may be revoked only with the consent of the Internal Revenue Service.
A shareholder makes the election by attaching a completed IRS Form 8621,
including the PFIC annual information statement, to a timely filed U.S. federal
income tax return. Even if an election is not made, a shareholder in a PFIC who
is a United States Holder must file a completed IRS Form 8621 every year.

    A United States Holder who owns PFIC shares that are publicly traded could
elect to mark the shares to market annually, recognizing as ordinary income or
loss each year an amount equal to the difference as of the close of the taxable
year between the fair market value of the PFIC shares and the United States
Holder's adjusted tax basis in the PFIC shares. If the mark-to-market election
were made, then the rules set forth above would not apply for periods covered by
the election. The subordinate voting shares would be treated as publicly traded
for purposes of the mark-to-market election and, therefore, such election would
be made if the Company were classified as a PFIC. A mark-to-market election is,
however, subject to complex and specific rules and requirements, and United
States Holders are strongly urged to consult their tax advisors concerning this
election if we are classified as a PFIC.

    We believe that we will not be a PFIC for 2001. Based on our current
business plan, we do not expect to become a PFIC in the foreseeable future.
These conclusions rest at least in part on factual issues, including a
determination as to value of assets and projections as to our revenue. We cannot
assure you that our actual revenues, including our revenues for the remainder of
2001, will be as projected or that a determination as to non-PFIC status would
not be challenged by the Internal Revenue Service. Moreover,

                                       19

the tests for determining PFIC status are applied annually, and it is difficult
to make accurate predictions of future income and assets, which are relevant to
the determination as to whether we will be a PFIC in the future. A United States
Holder who holds subordinate voting shares during a period in which we are a
PFIC will be subject to the PFIC rules, even if we cease to be a PFIC, unless he
or she has made a qualifying electing fund election. If we were determined to be
a PFIC with respect to a year in which we had not thought that we would be so
treated, the information needed to enable United States Holders to make a
qualifying electing fund election would not have been provided. United States
Holders are strongly urged to consult their tax advisors about the PFIC rules,
including the consequences to them of making a mark-to-market or qualifying
electing fund elections with respect to subordinate voting shares in the event
that we are treated as a PFIC.

TAX CONSEQUENCES FOR NON-UNITED STATES HOLDERS OF SUBORDINATE VOTING SHARES

    Except as described in "Information Reporting and Back-up Withholding"
below, a non-United States Holder of subordinate voting shares will not be
subject to U.S. federal income or withholding tax on the payment of dividends
on, and the proceeds from the disposition of, subordinate voting shares unless:

    - the item is effectively connected with the conduct by the non-United
      States Holder of a trade or business in the United States and, in the case
      of a resident of a country that has a treaty with the United States, such
      item is attributable to a permanent establishment, or, in the case of an
      individual a fixed place of business, in the United States;

    - the non-United States Holder is an individual who holds the subordinate
      voting shares as a capital asset and is present in the United States for
      183 days or more in the taxable year of the disposition and does not
      qualify for an exemption; or

    - the non-United States Holder is subject to tax pursuant to the provisions
      of U.S. tax law applicable to U.S. expatriates.

INFORMATION REPORTING AND BACK-UP WITHHOLDING

    United States Holders are subject to information reporting and back-up
withholding at a rate of 31% on dividends and proceeds paid from the disposition
of shares, unless the United States Holder (i) is a corporation or comes within
certain other exempt categories and demonstrates this fact when so required, or
(ii) provides a correct taxpayer identification number, certifies that it is not
subject to backup withholdings, and otherwise complies with applicable
requirements of the backup withholding rules.

    Non-United States Holders generally are not subject to information reporting
or back-up withholding with respect to dividends paid on or upon the disposition
of shares, provided in some instances that the non-United States Holder provides
a taxpayer identification number, certifies to his foreign status or otherwise
establishes an exemption.

    The amount of any back-up withholding will be allowed as a credit against
U.S. federal income tax liability and may entitle the Holder to a refund,
provided that required information is furnished to the Internal Revenue Service.

                                       20

PREFERENCE SHARES

    Our articles permit the issuance of preference shares in series, without
further approval of shareholders. The number of preference shares of each series
and the designation, rights, privileges, restrictions and conditions attaching
to the shares of each series including, without limitation, any voting rights
(other than general voting rights), any rights to receive dividends or any terms
of redemption shall be determined by the board of directors. The holders of the
preference shares are entitled to dividends in priority to the holders of
multiple voting shares, the subordinate voting shares or other shares ranking
junior to the preference shares. With respect to a distribution of assets in the
event of a liquidation, dissolution or winding-up of the company, whether
voluntary or involuntary, or any other distribution of the assets of the company
for the purposes of winding up its affairs, the preference shares rank in
priority to the multiple voting shares, the subordinate voting shares and any
other shares ranking junior to the preference shares.

                         DESCRIPTION OF DEBT SECURITIES

GENERAL

    We may issue debt securities in one or more series under an indenture that
we will enter into with The Chase Manhattan Bank, as trustee, that will be
described in the prospectus supplement for the debt securities. The following
summary of the indenture and the debt securities is not complete. For a more
complete description, you should refer to the indenture and the terms of the
debt securities, which we have filed or which we will file with the Commission.
Please read "Where You Can Find More Information." The terms of debt securities
we offer may differ from the general information we have provided below. You
should rely only on information in the prospectus supplement if it is different
from the following information.

    References to the "issuer", "us" or "we" in this description of debt
securities mean Celestica but not any of our subsidiaries.

    The indenture does not limit the amount of debt securities we can issue
under the indenture and does not limit the amount of other indebtedness we may
incur. We may issue debt securities from time to time in separate series.

    The prospectus supplement for any series of debt securities we offer will
describe the specific terms of the debt securities and may include any of the
following:

    - the title of the debt securities

    - any limit on the aggregate principal amount of the debt securities

    - whether payment on the debt securities will be senior or subordinated to
      our other liabilities or obligations

    - whether the payment of the debt securities will be secured by any of our
      assets or guaranteed by any other person

    - the dates on which we may issue the debt securities and the date or dates
      on which we will pay the principal and any premium on the debt securities

    - whether the debt securities will bear interest, the interest rate or the
      method of determining the interest rate, the date from which interest will
      accrue, the dates on which we will pay interest and the record dates for
      interest payments

    - the place or places we will pay interest

    - whether and under what circumstances we will be required to pay any
      additional amounts with respect to the debt securities, and whether we
      will have the option to redeem the debt securities rather than pay the
      additional amounts

    - whether we will be obligated to redeem or repurchase the debt securities
      pursuant to any sinking fund or other provisions, or at the option of a
      holder

                                       21

    - whether we may redeem the debt securities at our option

    - the denominations in which we will issue the debt securities

    - whether we will offer the debt securities at a discount and the portion of
      the principal amount that will be payable if the maturity is accelerated,
      if it is less than 100%

    - whether we will make payments on the debt securities in a foreign currency
      or currency unit other than United States dollars and whether payments
      will be payable with reference to any index or formula

    - whether we will issue the debt securities as global securities and, if so,
      the identity of the depositary for the global securities

    - whether we will issue the debt securities as bearer securities or only in
      registered form

    - any changes or additions to events of default or covenants

    - any changes or additions to the provisions for defeasance we describe
      under "Defeasance" below

    - whether the holders of any series of debt securities have special rights
      if specified events occur

    - any restrictions on the transfer or exchange of the debt securities

    - the terms for any conversion or exchange of the debt securities for any
      other securities

    - any other terms of the debt securities

    Unless we state otherwise in the applicable prospectus supplement, no holder
will have the right to require us to repurchase the debt securities and there
will be no increase in the interest rate if we become involved in a highly
leveraged transaction or there is a change of control of Celestica.

    We may issue debt securities under the indenture bearing no interest or
interest at a rate below the prevailing market rate at the time of issuance, and
offer and sell these securities at a discount below their stated principal
amount. We may also sell any of the debt securities for a foreign currency or
currency unit, and payments on the debt securities may be payable in a foreign
currency or currency unit. In any of these cases, we will describe in the
applicable prospectus supplement, any Canadian and United States federal income
tax consequences and other special considerations.

    We may issue debt securities with terms different from those of debt
securities previously issued and, without the consent of the holders thereof, we
may reopen a previous issue of a series of debt securities and issue additional
debt securities of such series (unless the reopening was restricted when such
series was created).

    Unless we state otherwise in the applicable prospectus supplement, we will
issue debt securities only in fully registered form without coupons, in
denominations of $1,000 and multiples of $1,000, and will pay only in United
States dollars. In addition, all or a portion of the debt securities of any
series may be issued in permanent registered global form which will be
exchangeable for definitive debt securities only under certain conditions. The
applicable prospectus supplement may indicate the denominations to be issued,
the procedures for payment of interest and principal and other matters. No
service charge will be made for any registration of transfer or exchange of the
debt securities, but we may, in certain instances, require payment of a sum
sufficient to cover any tax or other governmental charge payable in connection
with these transactions.

PAYMENT AND TRANSFER

    Unless we state otherwise in the prospectus supplement, we will make
payments on the debt securities at the office of the paying agent we designate
from time to time. Unless we state otherwise in the applicable prospectus
supplement, we will make payment to the persons in whose names the debt
securities are registered on the close of business on the day or days specified
by us. We will make debt securities payments in other forms at a place
designated by us and specified in the applicable prospectus supplement.

                                       22

    Holders may transfer or exchange fully registered debt securities at the
corporate trust office of the Trustee or at any other office or agency we
maintain for these purposes, without the payment of any service charge except
for any tax or governmental charge.

GLOBAL SECURITIES

    We may issue debt securities of a series in the form of one or more global
securities which will be deposited with a depositary, or its nominee, identified
in the applicable prospectus supplement. The global securities may be in
temporary or permanent form. We will describe in the applicable prospectus
supplement the terms of any depositary arrangement and the rights and
limitations of owners of beneficial interests in any global security. We will
also describe in the applicable prospectus supplement the exchange, registration
and transfer rights relating to any global security.

MERGER, AMALGAMATION OR CONSOLIDATION

    The indenture generally permits us to amalgamate or consolidate with or
merge into any other person, and to transfer or dispose of substantially all of
our assets, so long as the resulting person is a U.S. or Canadian corporation
and assumes our obligations on the debt securities and under the indenture.

    If the resulting person assumes our obligations, we will be relieved of
those obligations except where we have transferred or disposed of our assets by
lease.

PROVISION OF FINANCIAL INFORMATION

    We will file with the trustee and mail to all holders, as their names and
addresses appear in the security register, copies of our annual report or the
information, documents and other reports that we are required to file with the
Commission pursuant to the Exchange Act. We will agree to continue to file with
the Commission and provide the trustee and holders (a) within 140 days after the
end of each fiscal year, an annual report; and (b) within 60 days after the end
of each of the first three fiscal quarters of each fiscal year, quarterly
reports even if we are no longer required to do so under the Exchange Act. The
information contained in these reports will be, at a minimum, the information
required to be provided in annual and quarterly reports by law in Canada to
security holders of a corporation with securities listed on The Toronto Stock
Exchange.

EVENTS OF DEFAULT

    When we use the term "event of default" in the indenture, we mean:

    - we fail to pay principal or any premium on any debt security of that
      series when it is due

    - we fail to pay interest or any additional amounts on any debt security of
      that series for 30 days

    - we fail to make any sinking fund payment for that series of debt
      securities for 30 days

    - we fail to comply with any of our other agreements relating to the debt
      securities or the indenture for 90 days after written notice by the
      trustee or by holders of at least 25% in aggregate principal amount of the
      outstanding debt securities

    - certain events involving our bankruptcy, insolvency or reorganization, and

    - any other event of default provided for that series of debt securities

    The prospectus supplement for a series of debt securities may include
additional events of default or changes to the events of default described
above. The trustee may withhold notice to the holders of debt securities of any
default (except in the payment of principal or interest) if it considers it in
the interests of the holders to do so.

    A default under one series of debt securities will not necessarily be a
default under another series.

                                       23

    If an event of default for any series of debt securities occurs and
continues, the trustee or the holders of at least 25% in aggregate principal
amount of the debt securities of the series, in some cases, all affected series,
or in other cases, all series, may require us to repay immediately:

    - the entire principal of the debt securities of the series; or

    - if the debt securities are discounted securities, that portion of the
      principal as is described in the applicable prospectus supplement.

    If an event of default relates to events involving our bankruptcy,
insolvency or reorganization, the principal of all debt securities will become
immediately due and payable without any action by the trustee or any holder.
Subject to certain conditions, the holders of a majority of the aggregate
principal amount of the debt securities of the affected series can rescind this
accelerated payment requirement.

    Other than its duties in case of a default, the trustee is not obligated to
exercise any of its rights or powers under the indenture at the request, order
or direction of any holders, unless the holders offer the trustee reasonable
indemnity. If they provide this reasonable indemnity, the holders of a majority
in principal amount of any series of debt securities may, subject to certain
limitations, direct the time, method and place of conducting any proceeding or
any remedy available to the trustee, or exercising any power conferred upon the
trustee, for any series of debt securities.

    We will be required to furnish to the trustee a statement annually as to our
compliance with all conditions and covenants under the indenture and, if we are
not in compliance, we must specify any defaults.

DEFEASANCE

    When we use the term "defeasance", we mean discharge from some or all of our
obligations under the indenture. If we deposit with the trustee sufficient cash
or government securities to pay the principal, interest, any premium and any
other sums due to the stated maturity date or a redemption date of the debt
securities of a series, then at our option:

    - we will be discharged from our obligation with respect to the debt
      securities of that series, or

    - we will no longer be under any obligation to comply with certain
      restrictive covenants under the indenture, and certain events of default
      will no longer apply to us.

If this happens, the holders of the debt securities of the affected series will
not be entitled to the benefits of the indenture except for registration of
transfer and exchange of debt securities and the replacement of lost, stolen or
mutilated debt securities. These holders may look only to the deposited fund for
payment on their debt securities.

    Unless we state otherwise in the prospectus supplement, we will be required
to deliver to the trustee an opinion of counsel to the effect that the deposit
and related defeasance would not cause the holders of the debt securities to
recognize income, gain or loss for U.S. or Canadian federal or Canadian
provincial income tax purposes. If we will be discharged from our obligations
with respect to the debt securities, and not just from our covenants, the U.S.
opinion must be based upon a ruling from or published by the United States
Internal Revenue Service or a change in law to that effect.

MODIFICATION AND WAIVER

    We may modify the indenture with the consent of the holders of a majority in
aggregate principal amount of the outstanding debt securities of all series
(acting together as one class) affected by the modification. However, without
the consent of each holder affected, no modification may:

    - reduce the principal or interest rate or any obligation to pay any
      additional amounts

    - reduce the principal of an original issue discount security

    - change the place or currency of any payment

    - affect the holder's right to require us to repurchase the debt securities
      at the holder's option

                                       24

    - impair the right of the holders to institute a suit to enforce their
      rights to payment

    - adversely affect any conversion or exchange right related to a series of
      debt securities

    - change the percentage of debt securities required to modify the indenture
      or to waive compliance with certain provisions of the indenture

    - reduce the percentage in principal amount of outstanding debt securities
      necessary to take certain actions

    The holders of a majority in principal amount of outstanding debt securities
of any series (or, in some cases, of all outstanding debt securities under the
indenture or all series affected) may waive past defaults under the indenture
and our compliance with certain restrictive provisions of the indenture.
However, these holders may not waive a default in any payment on any debt
security or compliance with a provision that cannot be modified without the
consent of each holder affected.

    We may modify the indenture without the consent of the holders to:

    - evidence our successor under the indenture

    - add to covenants for the benefit of holders

    - add events of default

    - provide for bearer securities to become registered securities under the
      indenture

    - establish the forms of the debt securities

    - appoint a successor trustee under the indenture

    - add provisions to make the defeasance or discharge of the debt securities
      as long as there is no adverse affect on the holders

    - cure any ambiguity, to cure, correct or supplement any defective or
      inconsistent provision

    - in any other manner that would not materially and adversely affect the
      interests of holders of outstanding securities

CONSENT TO JURISDICTION AND SERVICE

    Under the indenture, we have irrevocably appointed CT Corporation System,
111 8th Avenue, 13th Floor, New York, New York, as our agent for service of
process in any suit or proceeding relating to the indenture and the debt
securities and for actions brought under United States federal or state
securities laws in any United States federal or state court located in The City
of New York and we submit to such jurisdiction.

GOVERNING LAW

    The indenture and the debt securities will be governed by and construed in
accordance with the laws of the State of New York.

THE TRUSTEE

    We have appointed The Chase Manhattan Bank as the trustee under the
indenture. The trustee or its affiliates may provide banking and other services
to us in the ordinary course of their business.

    The indenture contains certain limitations on the rights of the trustee, as
long as it or any of its affiliates remains our creditor, to obtain payment of
claims in certain cases or to realize on certain property received on any claim
as security or otherwise. The trustee and its affiliates will be permitted to
engage in other transactions with us. If the trustee or any affiliate acquires
any conflicting interest and a default occurs with respect to the debt
securities, the trustee must eliminate the conflict or resign.

                                       25

                            DESCRIPTION OF WARRANTS

    We may issue warrants to purchase subordinate voting shares, preference
shares, debt securities or other securities. We may issue warrants independently
or together with other securities, and warrants sold with other securities may
be attached to or separate from the other securities. Warrants will be issued
under one or more warrant agreements between us and a warrant agent that we will
name in the prospectus supplement.

    We have summarized selected provisions of the warrants and the warrant
agreements below. This summary is not complete. If we offer any warrants, we
will file the form of any warrant certificate and warrant agreement with the
Commission, and you should read the warrant certificate and warrant agreement
for provisions that may be important to you.

    The prospectus supplement relating to any warrants we offer will describe
the warrants and include specific terms relating to the offering. The prospectus
supplement will include some or all of the following:

    - the title of the warrants

    - the aggregate number of warrants offered

    - the designation, number and terms of the subordinate voting shares,
      preference shares, debt securities or other securities purchasable upon
      exercise of the warrants, and procedures that will result in the
      adjustment of those numbers

    - the exercise price of the warrants

    - the dates or periods during which the warrants are exercisable

    - the designation and terms of any securities with which the warrants are
      issued

    - if the warrants are issued as a unit with another security, the date on
      and after which the warrants and the other security will be separately
      transferable

    - if the exercise price is not payable in U.S. dollars, the foreign currency
      or currency unit in which the exercise price is denominated

    - any minimum or maximum amount of warrants that may be exercised at any one
      time

    - any terms, procedures and limitations relating to the transferability,
      exchange or exercise of the warrants

    - any other terms of the warrants

    Warrant certificates will be exchangeable for new warrant certificates of
different denominations at the office indicated in the prospectus supplement.
Prior to the exercise of their warrants, holders of warrants will not have any
of the rights of holders of the securities subject to the warrants.

MODIFICATIONS

    We may amend the warrant agreements and the warrants, without the consent of
the holders of the warrants, to cure any ambiguity, to cure, correct or
supplement any defective or inconsistent provision, or in any other manner that
will not materially and adversely affect the interests of holders of outstanding
warrants.

ENFORCEABILITY

    The warrant agent will act solely as our agent. The warrant agent will not
have any duty or responsibility if we default under the warrant agreements or
the warrant certificates. A warrant holder may, without the consent of the
warrant agent, enforce by appropriate legal action on its own behalf the
holder's right to exercise the holder's warrants.

                                       26

                                 LEGAL MATTERS

    Davies Ward Phillips & Vineberg LLP, Canadian counsel for the Company, and
Kaye Scholer LLP, U.S. counsel for the Company, will issue an opinion about the
legality of the securities offered under this prospectus. As of the date of this
prospectus, certain attorneys with Davies Ward Phillips & Vineberg LLP and Kaye
Scholer LLP own, in the aggregate, less than one percent of the outstanding
subordinate voting shares. If any underwriters named in a prospectus supplement
engage their own counsel to pass upon legal matters relating to the securities,
that counsel will be named in the prospectus supplement.

                                    AUDITORS

    The auditors of the Company are KPMG LLP, Suite 500, Yonge Corporate Centre,
4120 Yonge Street, Toronto, Ontario M2P 2B8. The Celestica Consolidated
Financial Statements as of and for the years ended December 31, 1999 and 2000
have been audited by KPMG LLP, independent chartered accountants, and are
incorporated by reference herein and in the registration statement in reliance
upon the report of KPMG LLP, independent chartered accountants, incorporated by
reference herein, and upon the authority of said firm as expert in auditing and
accounting.

                                INDEMNIFICATION

    Under the BUSINESS CORPORATIONS ACT (Ontario) and pursuant to our by-laws,
we indemnify our directors or officers, former directors or officers, or a
person who acts or acted at our request as a director or officer of a
corporation of which we are or were a shareholder or creditor, and his heirs and
legal representatives, against all costs, charges and expenses, including an
amount paid to settle an action or satisfy a judgment, reasonably incurred by
him in respect of any civil, criminal or administrative action or proceeding to
which he is made a party by reason of being or having been our director or
officer or a director or officer such corporation, if (i) he acted honestly and
in good faith with a view to our best interests, and (ii) in the case of a
criminal or administrative action or proceeding that is enforced by a monetary
penalty, he had reasonable grounds for believing that his conduct was lawful.

    Insofar as indemnification for liabilities arising under the Securities Act
may be permitted, Celestica has been informed that in the opinion of the
Commission such indemnification is against public policy as expressed in the
Securities Act and is therefore unenforceable.

                                       27