SEC FILE NUMBER
                                                                    000-21319

                                                                  CUSIP NUMBER
                                                                   532226 10 7


                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 12b-25
                           NOTIFICATION OF LATE FILING



     (Check One) [X] Form 10-K [ ] Form 20-F [ ] Form 11-K [ ] Form 10-Q
[ ] Form N-SAR [ ] Form N-CSR

     For Period Ended: December 31, 2005
                      ------------------------

     [ ] Transition Report on Form 10-K
     [ ] Transition Report on Form 20-F
     [ ] Transition Report on Form 11-K
     [ ] Transition Report on Form 10-Q
     [ ] Transition Report on Form N-SAR
     For the Transition Period Ended:
                                     --------------------

     Read attached instruction sheet before preparing form. Please print or
type. NOTHING IN THIS FORM SHALL BE CONSTRUED TO IMPLY THAT THE COMMISSION HAS
VERIFIED ANY INFORMATION CONTAINED HEREIN.

     If the notification relates to a portion of the filing checked above,
identify the Item(s) to which the notification relates:

     N/A
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PART I - REGISTRANT INFORMATION

     Lightbridge, Inc.
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Full Name of Registrant

     N/A
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Former Name if Applicable

     30 Corporate Drive
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Address of Principal Executive Office (Street and Number)

     Burlington, MA  01803
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City, State and Zip Code

PART II - RULES 12b-25(b) AND (c)

If the subject report could not be filed without unreasonable effort or expense
and the registrant seeks relief pursuant to Rule 12b-25(b), the following should
be completed. (Check box if appropriate.)

          (a)  The reasons described in reasonable detail in Part III of this
               form could not be eliminated without unreasonable effort or
               expense;

          (b)  The subject annual report, semi-annual report, transition report
               on Form 10-K, Form 20-F, Form 11-K, Form N-SAR or Form N-CSR, or
               portion thereof, will be filed on or before the fifteenth
[X]            calendar day following the prescribed due date; or the subject
               quarterly report or transition report on Form 10-Q, or portion
               thereof, will be filed on or before the fifth calendar day
               following the prescribed due date; and

          (c)  The accountant's statement or other exhibit required by Rule
               12b-25(c) has been attached if applicable.



PART III - NARRATIVE

State below in reasonable detail the reasons why Forms 10-K, 20-F, 11-K, 10-Q,
N-SAR, N-CSR, or the transition report or portion thereof, could not be filed
within the prescribed time period.

The Registrant was unable to file, on the prescribed filing date, without
unreasonable effort and expense, its Annual Report on Form 10-K for the year
ended December 31, 2005, because of unanticipated difficulties and delays in
determining the classification of the gain and net proceeds related to the sales
of its Fraud Centurion product suite and Intelligent Network Services business
in its financial statements. The determination will have no effect on previously
reported revenue, net income or total assets.

PART IV - OTHER INFORMATION

(1)  Name and telephone number of person to contact in regard to this
     notification

        Eugene J. DiDonato             781               359-4000
     ------------------------       ---------         --------------
              (Name)               (Area Code)      (Telephone Number)

(2)  Have all other periodic reports required under Section 13 or 15(d) of the
     Securities Exchange Act of 1934 or Section 30 of the Investment Company Act
     of 1940 during the preceding 12 months or for such shorter period that the
     registrant was required to file such report(s) been filed? If answer is no,
     identify report(s). [X] Yes [ ] No

(3)  Is it anticipated that any significant change in results of operations from
     the corresponding period for the last fiscal year will be reflected by the
     earnings statements to be included in the subject report or portion
     thereof? [ ] Yes [X] No

If so: attach an explanation of the anticipated change, both narratively and
quantitatively, and, if appropriate, state the reasons why a reasonable estimate
of the results cannot be made.

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                                Lightbridge, Inc.
                  --------------------------------------------
                  (Name of Registrant as Specified in Charter)

has caused this notification to be signed on its behalf by the undersigned
thereunto duly authorized.

Date: March 17, 2006          By: /s/ Eugene J. DiDonato
      ------------------         ----------------------------------
                                 Eugene J. DiDonato, Vice President
                                 and General Counsel

INSTRUCTION: The form may be signed by an executive officer of the registrant or
by any other duly authorized representative. The name and title of the person
signing the form shall be typed or printed beneath the signature. If the
statement is signed on behalf of the registrant by an authorized representative
(other than an executive officer), evidence of the representative's authority to
sign on behalf of the registrant shall be filed with the form.