X0306 4 2018-04-03 0 0001574235 Pulmatrix, Inc. PULM 0001229592 GILLIS STEVEN 8755 W HIGGINS, SUITE 1025 CHICAGO IL 60631 1 0 0 0 0001402439 Arch Venture Fund VII LP 8755 W HIGGINS, SUITE 1025 CHICAGO IL 60631 0 0 0 1 Former 10% owner 0001544444 ARCH Venture Partners VII, L.P. 8755 W. HIGGINS ROAD SUITE 1025 CHICAGO IL 60631 0 0 0 1 Former 10% owner 0001544443 ARCH Venture Partners VII, LLC 8755 W. HIGGINS ROAD SUITE 1025 CHICAGO IL 60631 0 0 0 1 Former 10% owner 0001219039 CRANDELL KEITH C/O ARCH VENTURE FUND VII 8755 WEST HIGGINS ROAD, SUITE 1025 CHICAGO IL 60631 0 0 0 1 Former 10% owner 0001219043 BYBEE CLINTON C/O ARCH VENTURE FUND VII 8755 WEST HIGGINS ROAD, SUITE 1025 CHICAGO IL 60631 0 0 0 1 Former 10% owner 0001219042 NELSEN ROBERT C/O ARCH VENTURE FUND VII 8755 WEST HIGGINS ROAD, SUITE 1025 CHICAGO IL 60631 0 0 0 1 Former 10% owner Common Stock 2018-04-03 4 P 0 1150000 A 3436456 I See Footnotes Series A Warrant (right to buy) 0.65 2018-04-03 4 P 0 1150000 A 2018-04-03 2018-10-03 Common Stock 1150000 1150000 I See Footnotes Series B Warrant (right to buy) 0.75 2018-04-03 4 P 0 1150000 A 2018-04-03 2023-04-03 Common Stock 1150000 1150000 I See Footnotes The reported securities were included within 1,150,000 Units purchased by ARCH Venture Fund VII, L.P. ("ARCH VII") for $0.65 per Unit. Each Unit consisted of one share of common stock, one Series A Warrant to purchase one share of common stock at an exercise price of $0.65 per share, and one Series B Warrant to purchase one share of common stock at an exercise price of $0.75 per share. Securities held of record byARCH VII. The sole general partner of ARCH VII is ARCH Venture Partners VII, L.P. ("ARCH Partners VII"), which may be deemed to have shared voting and investment power over the shares held by ARCH VII. The sole general partner of ARCH Partners VII is ARCH Venture Partners VII, LLC ("ARCH VII LLC"), which may be deemed to have shared voting and investment power over the shares held by ARCH VII. ARCH Partners VII and ARCH VII LLC disclaim beneficial ownership of such shares, except to the extent of any pecuniary interest therein. The managing directors of ARCH VII LLC are Keith Crandell, Clinton Bybee and Robert Nelsen and they may be deemed to have shared voting and investment power over the shares held by ARCH VII. Dr. Steve Gillis owns an interest in ARCH Partners VII, but does not have dispositive or voting power. Messrs. Crandell, Bybee and Nelsen and Dr. Gillis disclaim beneficial ownership of such shares, except to the extent of any pecuniary interest therein. /s/ Steve Gillis 2018-04-05 /s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director of the general partner of the general partner of ARCH Venture Fund VII, L.P. 2018-04-05 /s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director of the general partner of ARCH Venture Partners VII, L.P. 2018-04-05 /s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director of ARCH Venture Partners VII, LLC 2018-04-05 /s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell 2018-04-05 /s/ Mark McDonnell, as Attorney-in-Fact for Clinton Bybee 2018-04-05 /s/ Mark McDonnell, as Attorney-in-Fact for Robert Nelsen 2018-04-05