X0306 4 2019-08-13 false 0001114995 IMPINJ INC PI 0001745725 Gibson Daniel Patrick 400 FAIRVIEW AVE N. SUITE 1200 SUITE 1200 SEATTLE WA 98109 true false true false COMMON STOCK 4231582 I Control person of managed fund COMMON STOCK 2019-08-13 4 M false 4754 0 A 4754 D RESTRICTED STOCK UNITS - 2018 0 2019-08-13 4 M false 4754 0 D COMMON STOCK 4754 0 D Sylebra HK Company Limited (SHK) may be deemed to beneficially own the Shares by virtue of its position as the investment advisor to Sylebra Capital Management Limited (SCM) in relation to the direct holders of the shares: Sylebra Capital Partners Master Fund Limited and other advisory clients (together SCPMF). SCM serves as the investment manager to SCPMF and is the parent of SHK. Mr. Gibson owns 100% of the shares of SHK and SCM. In such capacities, SHK, SCM and Mr. Gibson may be deemed to have voting and dispositive power over the Shares held for the SCPMF. Each restricted stock unit represents a contingent right to receive one share of Impinj common stock. On August 13, 2018, the reporting person was granted 4,754 restricted stock units ("RSUs"). These RSUs fully vested on August 13, 2019. Yukio Morikubo, Attorney in fact for Daniel Gibson 2019-08-15