UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 4)* Lightbridge, Inc. -------------------------------------------------------------- (Name of Issuer) Common Stock -------------------------------------------------------------- (Title of Class of Securities) 532226107 -------------------------------------------------------------- (CUSIP Number) December 31, 2002 -------------------------------------------------------------- (Date of Event Which Requires Filing of this Statement) Check appropriate box to designate the rule pursuant to which this Schedule is filed: [X] Rule 13d-1(b) [ ] Rule 13d-1(c) [ ] Rule 13d-1(d) *The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page. The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). Page 1 of 6 Pages ----------------------------- CUSIP No. 532226107 13G ----------------------------- -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Massachusetts Capital Resource Company 042631251 -------------------------------------------------------------------------------- (a) [ ] 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions) (b) [X] -------------------------------------------------------------------------------- SEC USE ONLY -------------------------------------------------------------------------------- 4. CITIZENSHIP OR PLACE OF ORGANIZATION A Massachusetts limited partnership -------------------------------------------------------------------------------- 5. SOLE VOTING POWER NUMBER OF 1,048,958 SHARES --------------------------------------------------- BENEFICIALLY 6. SHARED VOTING POWER OWNED BY 1,308,163 EACH REPORTING (includes 259,205 shares beneficially PERSON owned by partners of the reporting person WITH that the reporting person does not purport to beneficially own) --------------------------------------------------- 7. SOLE DISPOSITIVE POWER 1,048,958 --------------------------------------------------- 8. SHARED DISPOSITIVE POWER 1,308,163 (includes 259,205 shares beneficially owned by partners of the reporting person that the reporting person does not purport to beneficially own) -------------------------------------------------------------------------------- 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,308,163 (includes 259,205 shares beneficially owned by partners of the reporting person that the reporting person does not purport to beneficially own) -------------------------------------------------------------------------------- 10. CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES [ ] CERTAIN SHARES (See Instructions) -------------------------------------------------------------------------------- 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 4.76% -------------------------------------------------------------------------------- 12. TYPE OF REPORTING PERSON (See Instructions) PN -------------------------------------------------------------------------------- Page 2 of 6 Pages SCHEDULE 13G ------------ Item 1(a) Name of Issuer: Lightbridge, Inc. 1(b) Address of Issuer's Principal Executive Offices: 67 South Bedford Street Burlington, MA 01803 Item 2(a) Name of Person Filing: Massachusetts Capital Resource Company 2(b) Address of Principal Business Office or, if none, Residence: The Berkeley at 420 Boylston St. Boston, MA 02116 2(c) Citizenship: A Massachusetts limited partnership 2(d) Title of Class of Securities: Common Stock 2(e) CUSIP Number: 532226107 Item 3 If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b): The reporting person is an Investment Adviser registered under Section 203 of the Investment Advisers Act of 1940. Item 4 Ownership: 4(a) Amount beneficially owned: The reporting person beneficially owns 1,308,163 shares of Common Stock of Lightbridge, Inc. This figure includes (i) 246,600 shares of Common Stock beneficially owned, as of December 31, 2002, by one of the reporting person's partners, John Hancock Life Insurance Company, a direct wholly-owned subsidiary of John Hancock Financial Services, Inc., and (ii) 12,605 shares of Common Stock beneficially owned, as of December 31, 2002, by one of the reporting person's partners, Metropolitan Life Insurance Company, (See Item 8 and Exhibit A). The reporting person disclaims beneficial ownership of the shares beneficially owned by John Hancock Life Insurance Company and Metropolitan Life Insurance Company. 4(b) Percent of Class: 4.76% Page 3 of 6 Pages 4(c) Number of shares as to which such person has: (i) Sole power to vote or to direct the vote: 1,048,958 (ii) Shared power to vote or to direct the vote: 1,308,163 (includes 259,205 shares beneficially owned by John Hancock Life Insurance Company and Metropolitan Life Insurance Company that the reporting person does not purport to beneficially own) (iii) Sole power to dispose or to direct the disposition of: 1,048,958 (iv) Shared power to dispose or to direct the disposition of: 1,308,163 (includes 259,205 shares beneficially owned by John Hancock Life Insurance Company that the reporting person does not purport to beneficially own) Item 5 Ownership of Five Percent or Less of a Class: If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities check the following: [X] Item 6 Ownership of More than Five Percent on Behalf of Another Person: Not Applicable. Item 7 Identification and Classification of the Subsidiary which Acquired the Security Being Reported on by the Parent Holding Company: Not Applicable. Item 8 Identification and Classification of Members of the Group: This schedule has been filed pursuant to rule 13d-1(b)(1)(ii)(H). Exhibit A hereto sets forth the identity and Item 3 classification of each member of the group. Item 9 Notice of Dissolution of Group: Not Applicable. Page 4 of 6 Pages Item 10 Certification: By signing below the undersigned certifies that, to the best of its knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of such securities and were not acquired and are not held in connection with or as a participant in any transaction having such purpose or effect. After reasonable inquiry and to the best of its knowledge and belief, the undersigned certifies that the information set forth in this statement is true, complete and correct. MASSACHUSETTS CAPITAL RESOURCE COMPANY By: / s / William J. Torpey, Jr. ----------------------------- Name: William J. Torpey, Jr. Title: President February 12, 2003 Page 5 of 6 Pages Exhibit A Massachusetts Capital Resource Company is a limited partnership. Each of its partners is an insurance company as defined in Section 3(a)(19) of the Securities Exchange Act of 1934. Its general partners are: John Hancock Life Insurance Company, a direct wholly-owned subsidiary of John Hancock Financial Services, Inc. New England Life Insurance Company Massachusetts Mutual Life Insurance Company First Allmerica Financial Life Insurance Company Its limited partners are: Paul Revere Life Insurance Company Berkshire Life Insurance Company Boston Mutual Life Insurance Company Metropolitan Life Insurance Company Page 6 of 6 Pages