Seres Therapeutics (MCRB) 10-Q 2017 Q1 Quarterly report

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

(1) I, Roger J. Pomerantz, President and Chief Executive Officer of Seres Therapeutics, Inc. (the “Company”), hereby certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(2) The Quarterly Report on Form 10-Q of the Company for the period ended March 31, 2017 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

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

May 4, 2017	/s/ Roger J. Pomerantz
	Roger J. Pomerantz
	President and Chief Executive Officer (Principal Executive Officer)