EX-32.1 10 d273574dex321.htm CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, PURSUANT TO SECTION 906

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Transition Report of Repligen Corporation (the “Company”) on Form 10-K for the period ending December 31, 2011 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned officers of the Company hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to my knowledge, that:

| (1) | The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

| (2) | The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: March 15, 2012 |  |  |  | By: |  | /s/ WALTER C. HERLIHY
|  |  |  |  |  |  |  | Walter C. Herlihy
|  |  |  |  |  |  |  | Chief Executive Officer and President
|  |  |  |  |  |  |  | (Principal executive officer)
Date: March 15, 2012 |  |  |  | By: |  | /s/ WILLIAM J. KELLY
|  |  |  |  |  |  |  | William J. Kelly
|  |  |  |  |  |  |  | Chief Financial Officer
|  |  |  |  |  |  |  | (Principal financial and accounting officer)