X0306 4 2016-07-26 1 0001114995 IMPINJ INC PI 0001117120 ARCH VENTURE FUND V LP 8755 WEST HIGGINS ROAD SUITE 1025 CHICAGO IL 60631 0 0 1 0 0001161740 ARCH V ENTREPRENEURS FUND LP 8755 WEST HIGGINS ROAD SUITE 1025 CHICAGO IL 60631 0 0 1 0 0001274406 ARCH VENTURE PARTNERS V LP 8755 WEST HIGGINS ROAD SUITE 1025 CHICAGO IL 60631 0 0 1 0 0001274408 ARCH VENTURE PARTNERS V LLC 8755 WEST HIGGINS ROAD SUITE 1025 CHICAGO IL 60631 0 0 1 0 0001219039 CRANDELL KEITH 8755 WEST HIGGINS ROAD SUITE 1025 CHICAGO IL 60631 0 0 1 0 0001054117 LAZARUS STEVEN 8755 WEST HIGGINS ROAD SUITE 1025 CHICAGO IL 60631 0 0 1 0 0001219042 NELSEN ROBERT 8755 WEST HIGGINS ROAD SUITE 1025 CHICAGO IL 60631 0 0 1 0 Common Stock 2016-07-26 2016-07-26 4 C 0 820935 0.00 A 820935 D Common Stock 2016-07-26 2016-07-26 4 C 0 527088 0.00 A 1348023 D Common Stock 2016-07-26 2016-07-26 4 X 0 40026 9.32 A 1388049 D Common Stock 2016-07-26 2016-07-26 4 F 0 26641 14.00 D 1361408 D Series 1 Preferred Stock 2016-07-26 2016-07-26 4 C 0 820935 0.00 D Common Stock 820935 0 D Series 2 Preferred Stock 2016-07-26 2016-07-26 4 C 0 421684 0.00 D Common Stock 421684 0 D Series 2 Preferred Warrant (Right to Buy) 9.32 2016-07-26 2016-07-26 4 X 0 32022 0.00 D 2017-06-30 Common Stock 32022 0 D Each share of Series 1 Preferred Stock automatically converted into one share of Common Stock immediately prior to the completion of the Issuer's initial public offering of Common Stock and had no expiration date. 815,666 of these shares are held of record by ARCH Venture Fund V, L.P.; and 5,269 of these shares are held of record by ARCH V Entrepreneurs Fund, L.P. ARCH Venture Partners V, L.P., as the sole general partner of ARCH Venture Fund V, L.P. and ARCH V Entrepreneurs Fund, L.P., may be deemed to beneficially own certain of the shares held of record by ARCH Venture Fund V, L.P. and ARCH V Entrepreneurs Fund, L.P., but disclaims beneficial ownership of such shares, in which it does not have an actual pecuniary interest. ARCH Venture Partners V, LLC, as the sole general partner of ARCH Venture Partners V, L.P., may be deemed to beneficially own certain of the shares held of record by ARCH Venture Fund V, L.P. and ARCH V Entrepreneurs Fund, L.P. but disclaims beneficial ownership of such shares, in which it does not have an actual pecuniary interest. Robert Nelsen, Keith Crandell and Steven Lazarus are managing directors of ARCH Venture Partners V, LLC, and may be deemed to beneficially own certain of the shares held of record by ARCH Venture Fund V, L.P. and ARCH V Entrepreneurs Fund, L.P. Mr. Nelsen, Mr. Crandell and Mr. Lazarus disclaim beneficial ownership of all shares held of record by ARCH Venture Fund V, L.P. and ARCH V Entrepreneurs Fund, L.P., in which they do not have an actual pecuniary interest. By virtue of their relationship as affiliated entities who have overlapping general partners and managing directors, ARCH Venture Fund V, L.P., ARCH V Entrepreneurs Fund, L.P., ARCH Venture Partners V, L.P., ARCH Venture Partners V, LLC and Mr. Crandell, Mr. Nelsen and Mr. Lazarus may be deemed to share the voting and investment control of the record shares. Each share of Series 2 Preferred Stock automatically converted into 1.24996780424983 shares of Common Stock immediately prior to the completion of the Issuer's initial public offering of Common Stock and had no expiration date. 1,339,228 of these shares are held of record by ARCH Venture Fund V, L.P.; and 8,795 of these shares are held of record by ARCH V Entrepreneurs Fund, L.P. The warrant was automatically net exercised immediately prior to the completion of the Issuer's initial public offering of Common Stock. 1,378,987 of these shares are held of record by ARCH Venture Fund V, L.P.; and 9,062 of these shares are held of record by ARCH V Entrepreneurs Fund, L.P. 1,352,524 of these shares are held of record by ARCH Venture Fund V, L.P.; and 8,884 of these shares are held of record by ARCH V Entrepreneurs Fund, L.P. Not applicable. Mark McDonnell, as Attorney-in-Fact for Keith Crandell, as Managing Director of the general partner of the general partner of ARCH Venture Fund V, L.P. 2016-07-26 Mark McDonnell, as Attorney-in-Fact for Keith Crandell, as Managing Director of the general partner of ARCH V Entrepreneurs Fund, L.P. 2016-07-26 Mark McDonnell, as Attorney-in-Fact for Robert Nelsen, as Managing Director of ARCH Venture Partners V, L.P. 2016-07-26 Mark McDonnell, as Attorney-In-Fact for Robert Nelsen, as Managing Director of ARCH Venture Partners V LLC 2016-07-26 Mark McDonnell, as Attorney-in-Fact for Keith Crandell 2016-07-26 Mark McDonnell, as Attorney-in-Fact for Steven Lazarus 2016-07-26 Mark McDonnell, as Attorney-in-Fact for Robert Nelsen 2016-07-26