Sizmek (SZMK) 10-Q 2015 Q3 Quarterly report

Exhibit 32.1

SECTION 1350 CERTIFICATIONS

In connection with the Quarterly Report of Sizmek Inc. (the “Company”) on Form 10-Q for the quarterly period ended September 30, 2015, as filed with the SEC on the date hereof (the “Report”), the undersigned, in the capacities and on the dates indicated below, hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to such officer’s knowledge: (1) the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; 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 13, 2015	By:	/s/ Neil H. Nguyen
		Neil H. Nguyen
		Chief Executive Officer and
		President
Date: November 13, 2015	By:	/s/ Kenneth Saunders
		Kenneth Saunders
		Chief Financial Officer