Rapid7 (RPD) 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

I, Corey E. Thomas, Chief Executive Officer of Rapid7, Inc., do 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 the best of my knowledge, the Quarterly Report on Form 10-Q of Rapid7, Inc. for the quarter ended March 31, 2017 (the “Report”):

(1)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 result of operations of Rapid7, Inc. for the period presented herein.

Date: May 10, 2017	By:	/s/ Corey E. Thomas
		Name:  Corey E. Thomas
		Title:    President and Chief Executive Officer
		(Principal Executive Officer)