0001044321-11-000133.txt : 20110616 0001044321-11-000133.hdr.sgml : 20110616 20110616161843 ACCESSION NUMBER: 0001044321-11-000133 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20110614 FILED AS OF DATE: 20110616 DATE AS OF CHANGE: 20110616 ISSUER: COMPANY DATA: COMPANY CONFORMED NAME: LIGHTBRIDGE Corp CENTRAL INDEX KEY: 0001084554 STANDARD INDUSTRIAL CLASSIFICATION: SERVICES-MANAGEMENT CONSULTING SERVICES [8742] IRS NUMBER: 911975651 STATE OF INCORPORATION: NV FISCAL YEAR END: 1231 BUSINESS ADDRESS: STREET 1: 1600 TYSONS BOULEVARD STREET 2: SUITE 550 CITY: MCLEAN, STATE: VA ZIP: 22102 BUSINESS PHONE: 703.918.4904 MAIL ADDRESS: STREET 1: 1600 TYSONS BOULEVARD STREET 2: SUITE 550 CITY: MCLEAN, STATE: VA ZIP: 22102 FORMER COMPANY: FORMER CONFORMED NAME: Thorium Power, Ltd DATE OF NAME CHANGE: 20061011 FORMER COMPANY: FORMER CONFORMED NAME: NOVASTAR RESOURCES LTD. DATE OF NAME CHANGE: 20051011 FORMER COMPANY: FORMER CONFORMED NAME: NOVASTAR RESOURCES LTD DATE OF NAME CHANGE: 20050829 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: MARXE AUSTIN W & GREENHOUSE DAVID M CENTRAL INDEX KEY: 0001044321 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-34487 FILM NUMBER: 11915346 BUSINESS ADDRESS: STREET 1: C/O SPECIAL SITUATIONS FUNDS STREET 2: 527 MADISON AVENUE, SUITE 2600 CITY: NEW YORK STATE: NY ZIP: 10022 BUSINESS PHONE: 2122076500 MAIL ADDRESS: STREET 1: C/O SPECIAL SITUATIONS FUNDS STREET 2: 527 MADISON AVENUE, SUITE 2600 CITY: NEW YORK STATE: NY ZIP: 10022 4 1 primary_doc.xml PRIMARY DOCUMENT X0303 4 2011-06-14 0 0001084554 LIGHTBRIDGE Corp LTBR 0001044321 MARXE AUSTIN W & GREENHOUSE DAVID M C/O SPECIAL SITUATIONS FUNDS 527 MADISON AVENUE, SUITE 2600 NEW YORK NY 10022 0 0 1 0 Common Stock 2011-06-14 4 P 0 5742 3.729 A 1271474 I By Limited Partnerships Common Stock 2011-06-15 4 P 0 8000 3.5575 A 1279474 I By Limited Partnerships This is a weighted average price. 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). 799,670 shares of Common Stock are held by QP, 266,556 shares of Common Stock are held by Cayman, 213,248 shares of Common Stock are held by PE. The interest of Marxe and Greenhouse in the shares of Common Stock owned by QP, Cayman and PE is limited to the extent of his pecuniary interest. Austin W. Marxe 2011-06-16 David M. Greenhouse 2011-06-16