X0306 4 2014-09-08 0 0001279704 Cellectar Biosciences, Inc. CLRB 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 2014-09-08 4 P 0 182 3 A 1142368 I By Limited Partnerships This is a joint filing by Austin W. Marxe (Marxe), David M. Greenhouse (Greenhouse) and Adam C. Stettner (Stettner). 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 Life Sciences Fund, L.P. (LS), respectively. 539,418 shares of Common Stock are held by QP, 179,806 shares of Common Stock are held by Cayman and 423,144 shares of Common Stock are held by LS. The interest of Marxe, Greenhouse and Stettner in the shares of Common Stock owned by QP, Cayman and LS is limited to the extent of his pecuniary interest. Austin W. Marxe 2014-09-10 David M. Greenhouse 2014-09-10 Adam C. Stettner 2014-09-10