Form 8-K Filing

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549


FORM 8-K


CURRENT REPORT
Pursuant to Section 13 OR 15(d) of
The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported) April 9, 2010


FIRST HORIZON NATIONAL CORPORATION
(Exact name of registrant as specified in charter)

TN   001-15185   62-0803242
(State or other jurisdiction
of incorporation)
  (Commission File Number)   (IRS Employer Identification No.)


  165 MADISON AVENUE, MEMPHIS, TENNESSEE   38103  
  (Address of principal executive offices)   (Zip Code)  

Registrant's telephone number, including area code:   (901) 523-4444



________________________________________________________________________________
(Former name or former address, if changed since last report)



Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
  [   ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
  [   ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
  [   ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
  [   ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 7.01. Regulation FD Disclosure.

Furnished as Exhibit 99.1 is a copy of First Horizon National Corporation's press release issued April 9, 2010, regarding the modification of its operating segments as well as presentation of selected prior period data that conforms to the new segment structure.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits

The following exhibit is furnished pursuant to Item 7.01, is not to be considered "filed" under the Securities Exchange Act of 1934, as amended ("Exchange Act"), and shall not be incorporated by reference into any of the Company's previous or future filings under the Securities Act of 1933, as amended, or the Exchange Act.

Exhibit #

Description

99.1

Press Release issued April 9, 2010, regarding modified operating segments.


SIGNATURE

    Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

  FIRST HORIZON NATIONAL CORPORATION
(Registrant)


Date: April 9, 2010 By:   /s/ WILLIAM C. LOSCH III
William C. Losch III
Executive Vice President and Chief Financial Officer


EXHIBIT INDEX

EX-99.1 Press release issued April 9, 2010