X0306 4 2015-11-25 0 0001157601 SYNTA PHARMACEUTICALS CORP SNTA 0001325713 Kovner Bruce C/O CAXTON CORPORATION 731 ALEXANDER ROAD, BLDG. 2 PRINCETON NJ 08540 1 0 1 0 Common Stock 2015-11-25 4 S 0 959149 0.4881 D 3489499 I By OB Select Opportunities, LLC Common Stock 2015-11-25 4 S 0 544571 0.4881 D 1981218 I By Kovner 2012 Family Trust B Common Stock 2015-11-27 4 S 0 596132 0.495 D 2893367 I By OB Select Opportunities, LLC Common Stock 2015-11-27 4 S 0 338463 0.495 D 1642755 I By Kovner 2012 Family Trust B Common Stock 2015-11-30 4 S 0 408546 0.4335 D 2484821 I By OB Select Opportunities, LLC Common Stock 2015-11-30 4 S 0 231959 0.4335 D 1410796 I By Kovner 2012 Family Trust B Common Stock 3092677 D Common Stock 2279146 I By Wife Common Stock 11399464 I By KFO Holdings LLC Common Stock 4000000 I By Kovner 2015-A Investment Trust This constitutes the weighted average sale price. The prices range from $0.44 to $0.5118. The Reporting Person will provide upon request by the Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price. This constitutes the weighted average sale price. The prices range from $0.4435 to $0.5005. The Reporting Person will provide upon request by the Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price. This constitutes the weighted average sale price. The prices range from $0.428 to $0.463. The Reporting Person will provide upon request by the Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price. These shares are owned directly by OB Select Opportunities, LLC and indirectly by the Reporting Person as chairman and sole shareholder of Caxton Corporation, the manager of OB Select Opportunities, LLC. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or for any other purpose. These securities are owned by the wife of the Reporting Person and her estate planning vehicles. These shares are owned directly by KFO Holdings LLC and indirectly by the Reporting Person as chairman and sole shareholder of Caxton Corporation, the manager of KFO Holdings LLC. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or for any other purpose. /s/Heath N. Weisberg, Attorney-In-Fact 2015-11-30