X0206 3 2018-06-20 0 0001114995 IMPINJ INC PI 0001745725 Gibson Daniel Patrick 28 HENNESSY ROAD, 20TH FLOOR WAN CHAI K3 HONG KONG 1 0 1 0 0001627436 Sylebra HK Co Ltd 20/F, 28 HENNESSY ROAD WAN CHAI K3 HONG KONG 0 0 1 0 0001745666 Sylebra Capital Management, Ltd 20/F, 28 HENNESSY ROAD WAN CHAI K3 HONG KONG 0 0 1 0 Common Stock 4231582 I Control person of managed fund - footnote 1 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. /s/ Daniel Gibson 2018-07-09