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SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 10-K/A Amendment No. 1 FOR ANNUAL AND TRANSITION REPORTS PURSUANT TO
SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. (Mark One)þ
    
    ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934.For the fiscal year ended December 31, 2003OR ̈
    
    TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934.For the transition period
from ____________________ to ____________________
 Commission file number: 000-21319 Lightbridge, Inc.(Exact Name of Registrant as Specified in Its Charter)
 Delaware
    
    04-3065140(State or Other Jurisdiction of Incorporation or Organization)
    
    (I.R.S. Employer Identification No.)
 67 South Bedford StreetBurlington, Massachusetts
    
    01803(Address of Principal Executive Offices)
    
    (Zip Code)
 (781) 359-4000
(Registrants Telephone Number, Including Area Code)
Securities registered pursuant to Section 12(b) of the Act: None
Securities registered pursuant to Section 12(g) of the Act:
common stock, $.01 par value per share Indicate by check mark whether the registrant: (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.
Yes   þ     No   ̈ Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to
the best of the registrants knowledge, in definitive proxy or information
statements incorporated by reference in Part III of this Form 10-K or any
amendment to this Form 10-K.    þ Indicate by check mark whether the registrant is an accelerated filer (as
defined in Exchange Act Rule 12b-2).Yes   þ     No   ̈ The aggregate market value of the voting common stock held by
nonaffiliates of the registrant as of June 30, 2003 was $243,788,767, based on
a total of 28,347,531 shares held by nonaffiliates and on a closing price of
$8.60 as reported on The Nasdaq Stock Market (National Market System). The number of shares of common stock outstanding as of March 4, 2004 was
27,078,813. DOCUMENTS INCORPORATED BY REFERENCE




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|SIGNATURE                   
|EX-31.1 CERTIFICATION OF CEO
|EX-31.2 CERTIFICATION OF CFO



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The registrant intends to file a definitive proxy statement pursuant to
Regulation 14A with regard to its 2004 annual meeting of stockholders or
special meeting in lieu thereof on or before April 29, 2004. Certain portions
of such proxy statement are incorporated by reference in Part III of this Form
10-K. The cover page of the Lightbridge, Inc. Annual Report on Form 10-K for the
fiscal year ended December 31, 2003 is hereby amended by changing the number of
shares of common stock outstanding as of March 4, 2004 from 29,883,256 to
27,078,813. Item 15.Exhibits, Financial Statement Schedule and Reports on Form 8-K  (a)
    
    Documents filed as part of this report(3)
    
    Exhibits Exhibit No.  31.1
    
    Certification of Pamela D.A. Reeve dated March 26, 200431.2
    
    Certification of Harlan Plumley dated March 26, 2004 
 SIGNATURE Pursuant to the requirements of Section 13 or 15(d) 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 authorized, on the 26th day of
March, 2004. LIGHTBRIDGE, INC.By:
    
    /s/ HARLAN PLUMLEY
Harlan Plumley
Vice President, Finance and Administration
Chief Financial Officer and Treasurer
(Principal Financial and Accounting Officer)