X0306 4 2022-06-09 0 0001114995 IMPINJ INC PI 0001745725 Gibson Daniel Patrick 20/F, 28 HENNESSY ROAD WAN CHAI K3 HONG KONG 1 0 0 0 Common Stock 2022-06-09 4 M 0 870 0.00 A 11884 D Common Stock 2022-06-09 4 M 0 943 0.00 A 12827 D Restricted Stock Units 3397337 I Control person of managed fund Restricted Stock Units 0.00 2022-06-09 4 M 0 870 0.00 D Common Stock 870 0 D Restricted Stock Units 0.00 2022-06-09 4 A 0 943 0.00 A Common Stock 943 943 D Restricted Stock Units 0.00 2022-06-09 4 M 0 943 0.00 D Common Stock 943 0 D Restricted Stock Units 0.00 2022-06-09 4 A 0 3529 0.00 A Common Stock 3529 3529 D Sylebra Capital Limited ("SCL"), formally known as Sylebra HK Company Limited, may be deemed to beneficially own the Shares by virtue of its position as the investment manager to Sylebra Capital Partners Master Fund Limited and other advisory clients (together "SCPMF") in relation to the direct holders of the shares. Mr. Gibson owns 100% of the shares of SCL. In such capacities, SCL and Mr. Gibson may be deemed to have voting and dispositive power over the Shares held for the SCPMF. Each restricted stock unit ("RSU") represents a contingent right to receive one share of Impinj common stock. On June 10, 2021, the reporting person was granted 870 RSUs. These RSUs fully vested on June 9, 2022. On June 9, 2022, the reporting person was granted 943 RSUs. These RSUs fully vested on June 9, 2022. The restricted stock units will fully vest on the earlier of June 9, 2023 or the date of the 2023 annual meeting of stockholders. /s/ Yukio Morikubo, Attorney in fact for Daniel Patrick Gibson 2022-06-13