Synta Pharmaceuticals Sells Additional 1,050,000 Shares of Common Stock

Jefferies & Company, Inc. acted as the sole book-running manager for the offering, and Canaccord Genuity Inc. and Roth Capital Partners, LLC acted as co-managers for the offering.

The securities described above were offered by Synta pursuant to a shelf registration statement that was previously filed with and declared effective by the Securities and Exchange Commission (SEC). This press release does not constitute an offer to sell or a solicitation of an offer to buy the securities in this offering, nor shall there be any sale of these securities in any state or other jurisdiction in which such offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of any such state or other jurisdiction. A final prospectus supplement related to the offering was filed with the SEC and is available on the SEC's website located at www.sec.gov . Copies of the final prospectus supplement and the accompanying prospectus relating to this offering may be obtained from Equity Syndicate Prospectus Department, Jefferies & Company, Inc., 520 Madison Avenue, 12th Floor, New York, NY, 10022, by telephone at 877-547-6340, or by email at Prospectus_Department@Jefferies.com.