X0306 4 2017-11-15 false 0001114995 IMPINJ INC PI 0001184752 ALBERG TOM A 400 FAIRVIEW AVE N. SUITE 1200 SEATTLE WA 98109 true false false false COMMON STOCK 112792 D COMMON STOCK 31219 I By Raven Trust Fund COMMON STOCK 2017-11-15 4 J false 4817 0 D 0 I By Alberg Family Investments LLC Shares held of record by Raven Trust Fund. Mr. Alberg shares voting and dispositive control over such shares but disclaims beneficial ownership over such shares. Alberg Family Investments LLC holds shares of record in the Issuer. Mr. Alberg shared voting and dispositive control over such shares but disclaimed beneficial ownership over such shares. On November 15, 2017, Mr. Alberg sold his interests in Alberg Family Investments LLC on a pro rata basis to certain family members of Mr. Alberg, none of whom reside in Mr. Alberg's household. As a result, Mr. Alberg ceased to have reportable beneficial ownership of the shares of the Issuer held by Alberg Family Investments LLC that were included in Mr. Alberg's prior ownership reports. Yukio Morikubo as Attorney in fact for Tom Alberg 2019-05-01