UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): October 10, 2010

Infinity Pharmaceuticals, Inc.

(Exact name of registrant as specified in charter)

Delaware	000-31141	33-0655706
(State or other jurisdiction of incorporation)	(Commission File Number)	(IRS Employer Identification No.)

780 Memorial Drive, Cambridge, MA	02139
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (617) 453-1000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 8.01 Other Events

On October 10, 2010, we issued a press release announcing Phase 1 data of IPI-926 in patients with advanced or metastatic solid tumors. A copy of this press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Item 9.01 Financial Statements and Exhibits

(d) The following exhibit is included in this report:

Exhibit No.	Description
99.1	Press Release dated October 10, 2010

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	INFINITY PHARMACEUTICALS, INC.
Date: October 12, 2010	By:	/S/    GERALD E. QUIRK
		Gerald E. Quirk
		Vice President, Corporate Affairs and General Counsel