X0206 3 2013-01-25 0 0001195116 Arno Therapeutics, Inc ARNI 0001048462 WEXFORD CAPITAL LP 411 WEST PUTNAM AVENUE SUITE 125 GREENWICH CT 06830 0 0 1 0 0001048485 JACOBS JOSEPH C/O WEXFORD CAPITAL LP 411 WEST PUTNAM AVENUE, SUITE 125 GREENWICH CT 06830 0 0 1 0 0001472112 Wexford GP LLC C/O WEXFORD CAPITAL LP SUITE 125 GREENWICH CT 06830 0 0 1 0 0001001391 DAVIDSON CHARLES E C/O WEXFORD CAPITAL LP 411 WEST PUTNAM AVE. GREENWICH CT 06830 0 0 1 0 Common Stock 418876 I By: Kappa Investors LLC Common Stock 2828169 I By: Wexford Spectrum Investors LLC Warrants (right to buy) 2.42 2008-06-02 2013-06-02 Common Stock 24732 I By: Kappa Investors LLC Class A Warrants (right to buy) 0.5268 2010-09-09 2013-03-09 Common Stock 13441 I By: Kappa Investors LLC Class B Warrants (right to buy) 0.5649 2010-09-09 2015-09-09 Common Stock 70564 I By: Kappa Investors LLC Class A Warrants (right to buy) 0.5268 2010-09-09 2013-03-09 Common Stock 85759 I By: Wexford Spectrum Investors LLC Class B Warrants (right to buy) 0.5649 2010-09-09 2015-09-09 Common Stock 450236 I By: Wexford Spectrum Investors LLC The Common Stock and Warrants are held directly by Kappa Investors LLC ("Kappa"). The Common Stock and Warrants are held directly by Wexford Spectrum Investors LLC ("WSI", and together with Kappa, the "Funds"). This form is jointly filed by Wexford Capital LP ("Wexford"), Charles E. Davidson ("Davidson"), Joseph M. Jacobs ("Jacobs") and Wexford GP LLC ("Wexford GP"). The securities shown as beneficially owned by Davidson, Jacobs, Wexford GP and Wexford, reflect securities owned of record by the Funds. Wexford serves as manager for the Funds and as such may be deemed to share beneficial ownership of the securities beneficially owned by the Funds, but disclaims such beneficial ownership to the extent such beneficial ownership exceeds its pecuniary interest. (*continued under Footnote (4) below). (*continued from Footnote (3) above) Wexford GP, as the general partner of Wexford, may be deemed to share beneficial ownership of the securities beneficially owned by the Funds, but disclaims such beneficial ownership to the extent such beneficial ownership exceeds its pecuniary interest. Messrs. Davidson and Jacobs, as the controlling persons of Wexford GP, may be deemed to share beneficial ownership of any securities beneficially owned by the Funds for which Wexford serves as manager, but disclaim such beneficial ownership to the extent such beneficial ownership exceeds their pecuniary interest. Arthur H. Amron, Vice President and Assistant Secretary of Wexford GP LLC, the General Partner of Wexford Capital LP 2013-01-25 Arthur H. Amron, Vice President and Assistant Secretary of Wexford GP LLC 2013-01-25 Charles E. Davidson 2013-01-25 Joseph M. Jacobs 2013-01-25