Designated Filer: Warburg, Pincus Equity Partners, L.P.

Issuer & Ticker Symbol: InterMune, Inc. (ITMN)

Date of Event Requiring Statement: January 26, 2010

Exhibit 99.3

JOINT FILERS’ SIGNATURES

WARBURG PINCUS LLC By: /s/ Scott A. Arenare                                                    Name: Scott A. Arenare Title: Managing Director	Dated: January 27, 2010
WARBURG PINCUS PARTNERS, LLC        By:  Warburg Pincus & Co.,                 its Managing Member By: /s/ Scott A. Arenare                                                   Name: Scott A. Arenare Title: Partner	Dated: January 27, 2010
WARBURG PINCUS & CO. By: /s/ Scott A. Arenare                                                   Name: Scott A. Arenare Title: Partner	Dated: January 27, 2010
By: /s/ Scott A. Arenare                                                  Name: Charles R. Kaye By: Scott A. Arenare, Attorney-in-Fact*	Dated: January 27, 2010
By: /s/ Scott A. Arenare                                                  Name: Joseph P. Landy By: Scott A. Arenare, Attorney-in-Fact**	Dated: January 27, 2010

* The Power of Attorney given by Mr. Kaye was previously filed with the SEC on March 2, 2006 as an exhibit to a statement on Schedule 13D filed by Building Products, LLC with respect to Builders FirstSource, Inc. and is hereby incorporated by reference.

** The Power of Attorney given by Mr. Landy was previously filed with the SEC on March 2, 2006 as an exhibit to a statement on Schedule 13D filed by Building Products, LLC with respect to Builders FirstSource, Inc. and is hereby incorporated by reference.