X0206 3 2015-02-10 0 0001084554 LIGHTBRIDGE Corp LTBR 0001535264 AWM Investment Company, Inc. 527 MADISON AVENUE SUITE 2600 NEW YORK NY 10022 0 0 1 0 Common Stock 3508789 I By Limited Partnerships Warrants 9 2010-07-23 2017-07-28 Common Stock 454546 I By Limited Partnerships Warrants 2.3 2014-04-25 2021-04-25 Common Stock 571428 I By Limited Partnerships Warrants 2.31 2015-05-17 2022-05-17 Common Stock 2734590 I By Limited Partnerships AWM Investment Company, Inc., a Delaware corporation (AWM), is the investment adviser to Special Situations Fund III QP, L.P. (SSFQP), Special Situations Cayman Fund, L.P. (CAYMAN) and Special Situations Private Equity Fund, L.P. (SSPE and together with SSFQP and CAYMAN, the Funds). As the investment adviser to the Funds, AWM holds sole voting and investment power over 2,130,044 shares of Common Stock of the Issuer (the Shares) and 2,336,680 Warrants held by SSFQP, 719,684 Shares and 788,961 Warrants held by CAYMAN and 659,061 Shares and 634,923 Warrants held by SSPE. Austin W. Marxe (Marxe), David M. Greenhouse (Greenhouse) and Adam C. Stettner (Stettner) are the controlling principals of AWM. Marxe, Greenhouse and Stettner previously reported the Shares held by the Funds on Form 3. Accordingly, reference should be made to Marxe, Greenhouse and Stettner (CIK #0001044321) for any prior filings with the Securities and Exchange Commission relating to the Shares and Warrants held by each of the Funds. The reporting person disclaims beneficial ownership of the Shares, except to the extent of its pecuniary interest therein. This report shall not be deemed an admission that the reporting person is the beneficial owner of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose. The warrants described above may be exercised to the extent that the total number of shares of Common Stock then beneficially owned does not exceed 4.99% of the outstanding shares. The holder may request an increase of up to 9.99% of the outstanding shares, effective on the 61st day after notice is given to the Company. The warrants described above may be exercised to the extent that the total number of shares of Common Stock then beneficially owned does not exceed 4.99% of the outstanding shares. The holder may request an increase of up to 19.99% of the outstanding shares, effective on the 61st day after notice is given to the Company. Adam C. Stettner 2015-02-10