FORM 6-K

 

SECURITIES AND EXCHANGE COMMISSION
Washington D.C. 20549

 

Report of Foreign Issuer

 

Pursuant to Rule 13a-16 or 15d-16 of
the Securities Exchange Act of 1934


For period ending July 07, 2008

GlaxoSmithKline plc
(Name of registrant)

 

980 Great West Road, Brentford, Middlesex, TW8 9GS
(Address of principal executive offices)


Indicate by check mark whether the registrant files or
will file annual reports under cover Form 20-F or Form 40-F


Form 20-F x Form 40-F
 --


Indicate by check mark whether the registrant by furnishing the
information contained in this Form is also thereby furnishing the
information to the Commission pursuant to Rule 12g3-2(b) under the
Securities Exchange Act of 1934.

Yes No x
  --

GlaxoSmithKline plc (the 'Company') announces that in accordance with the
 
authority granted by shareholders at the Company's Annual General Meeting on 
21 May
 2008
 it purchased 
2,000,000
 of its Ordinary shares of 25 pence each
 
('shares') on 
7 July
 2008
at a price of 
1170.9497
 
pence per share.

The shares will be cancelled.

Following the cancellation of these shares, the Company holds
474,194,158
 of its shares in Treasury, representing 
8.99% of the total voting rights in the Company.

The Company has 
5,273,776,516
 
shares 
in issue (excluding Treasury shares). This number
 
represents the total voting rights in the Company and may be used by
 
shareholders as the denominator for the calculations by which they can determine
 
if they are required to notify their interest in, or a change to their interest
 
in the Company under the Financial Services Authority's Disclosure and
 
Transparency Rules.

This announcement does not constitute, or form part of, an offer or any
 
solicitation of an offer to purchase or subscribe for securities in any
 
jurisdiction and is in conformity with the Financial Services Authority's
 
Disclosure and Transparency Rules.

 


SIGNATURES


Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorised.

 

                                                             GlaxoSmithKline plc
                                                                    (Registrant)

Date:  July 07, 2008

                                                                                                        By: VICTORIA WHYTE
                                                                                                                                                                ------------------
                                                              Victoria Whyte
                                                 Authorised Signatory for and on
                                                   behalf of GlaxoSmithKline plc