LIGHTBRIDGE Corp — Director's Dealing 2011

Jan 28, 2011

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: LIGHTBRIDGE Corp (LTBR)
CIK: 0001084554
Period of Report: 2011-01-28

Reporting Person: MARXE AUSTIN W & GREENHOUSE DAVID M (10% Owner)

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	1223392	Indirect

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Warrant	$9	2017-07-28	Common Stock (454546)		Indirect

Footnotes

F1: This is a joint filing by Austin W. Marxe (Marxe) and David M. Greenhouse (Greenhouse). They share voting and investment control over all securities owned by Special Situations Fund III QP, L.P. (QP), Special Situations Cayman Fund, L.P. (Cayman) and Special Situations Private Equity Fund, L.P. (PE). 764,932 shares of Common Stock are held by QP, 254,977 shares of Common Stock are held by Cayman, 203,983 shares of Common Stock are held by PE. The interest of Marxe and Greenhouse in the shares of Common Stock owned by QP, Cayman, PE and DG is limited to the extent of his pecuniary interest.

F2: This is a joint filing by Austin W. Marxe (Marxe) and David M. Greenhouse (Greenhouse). They share voting and investment control over all securities owned by Special Situations Fund III QP, L.P (QP), Special Situations Cayman Fund, L.P. (Cayman) and Special Situations Private Equity Fund, LP (PE). 284,091 Warrants are owned by QP, 94,697 Warrants are owned by Cayman and 75,758 Warrants are owned by PE. The interest of Marxe and Greenhouse in the shares of Warrants owned by QP, Cayman and PE are limited to the extent of his pecuniary interest.