Pulmatrix (PULM) 10-Q 2017 Q3 Quarterly report

Exhibit 32.1

CERTIFICATIONS UNDER SECTION 906

Pursuant to section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of section 1350, chapter 63 of title 18, United States Code), each of the undersigned officers of Pulmatrix, Inc., a Delaware corporation (the “Company”), does hereby certify, to such officer’s knowledge and in the capacity of an officer, that:

The Quarterly Report for the quarter ended September 30, 2017 (the “Form10-Q”) of the Company fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, and the information contained in the Form10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company as of, and for, the periods presented inthe Form 10-Q.

Date: November 9, 2017	/s/ Robert W. Clarke
	Robert W. Clarke
	President and Chief Executive Officer
	(Principal Executive Officer)
Date: November 9, 2017	/s/ William Duke, Jr.
	William Duke, Jr.
	Chief Financial Officer
	(Principal Financial Officer)