X0306 4 2020-03-13 0 0001114995 IMPINJ INC PI 0001745725 Gibson Daniel Patrick 20/F, 28 HENNESSY ROAD WAN CHAI K3 HONG KONG 1 0 0 0 0001745666 Sylebra Capital Management, Ltd 20/F, 28 HENNESSY ROAD WAN CHAI K3 HONG KONG 0 0 1 0 0001627436 Sylebra Capital Ltd 20/F, 28 HENNESSY ROAD WAN CHAI K3 HONG KONG 0 0 1 0 Common Stock 2020-03-13 4 P 0 48857 18.211 A 4397322 I Control person of managed fund(1) Common Stock 4754 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. /s/ Yukio Morikubo, Attorney in fact 2020-03-17