EX-32.2 6 a12-19894_1ex32d2.htm EX-32.2

Exhibit 32.2

 

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 Quarterly Report on Form 10-Q of Merrimack Pharmaceuticals, Inc. (the “Company”) for the period ended September 30, 2012 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, William A. Sullivan, Chief Financial Officer and Treasurer of the Company, hereby certifies, pursuant to 18 U.S.C. Section 1350, that to his knowledge:

 

(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: November 14, 2012

 

/s/ William A. Sullivan

 

 

William A. Sullivan

 

 

Chief Financial Officer and Treasurer

 

 

(Principal Financial Officer)