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): April 15, 2009

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 2.02. Results of Operations and Financial Condition.

On April 15, 2009, we issued a press release in which we stated that we anticipate announcing that we ended the first quarter of 2009 with approximately $153 million in cash, cash equivalents and available-for-sale securities. A copy of this press release was filed as Exhibit 99.1 to our Current Report on Form 8-K filed on April 15, 2009 and is incorporated herein by reference.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits

99.1 Press Release dated April 15, 2009. Previously filed as Exhibit 99.1 to our Current Report on Form 8-K filed on April 15, 2009 (File No. 000-31141) and incorporated herein by reference.

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: April 21, 2009	By:	/s/ Gerald E. Quirk
		Gerald E. Quirk
		Vice President & General Counsel