X0306 4 2018-06-14 false 0001114995 IMPINJ INC PI 0001219043 BYBEE CLINTON 8755 WEST HIGGINS SUITE 1025 CHICAGO IL 60631 true false false false COMMON STOCK 1366735 I See footnote COMMON STOCK 2018-06-14 4 M false 2023 0 A 6440 D RESTRICTED STOCK UNITS - 2017 2018-06-14 4 M false 2023 0 D COMMON STOCK 2023 0 D RESTRICTED STOCK UNITS - 2018 2018-08-13 4 A false 4754 0 A COMMON STOCK 4754 4754 D 1,357,816 of these shares are held of record by ARCH Venture Fund V, L.P.; and 8,919 of these shares are held of record by ARCH V Entrepreneurs Fund, L.P. Clinton Bybee, a member of the board of directors, is a managing director 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. Bybee disclaims beneficial ownership of all shares held of record by ARCH Venture Fund V, L.P. and ARCH V Entrepreneurs Fund, L.P., of which he does 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. Bybee may be deemed to share the voting and investment control of the record shares. 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. Restricted stock units convert to common stock on a one-to-one basis. Each restricted stock unit represents a contingent right to receive one share of Impinj common stock. On June 14, 2017, the reporting person was granted 2,023 restricted stock units (RSUs). These RSUs fully vested on June 14, 2018. The restricted stock units will fully vest on August 13, 2019. Yukio Morikubo, as Attorney-In-Fact for Clinton Bybee 2018-08-16