X0306 5 2019-12-31 false 0 0 0001114995 IMPINJ INC PI 0001736540 MASTERS DENISE 400 FAIRVIEW AVE N. SUITE 1200 SEATTLE WA 98109 false true false false VP Accounting COMMON STOCK 2019-02-20 5 A false 1292 16.5 A 3260 D COMMON STOCK 2019-08-20 5 A false 472 16.5 A 3732 D The reporting person is voluntarily reporting the acquisition of shares of the issuer's common stock pursuant to the Employee Stock Purchase Plan ("ESPP"), for the ESPP Purchase Period (as defined in the ESPP) of October 22, 2018 through February 20, 2019. This transaction is also exempt under Rule 16b-3(c). The Purchase Period ended February 20, 2019 and is the second of two Purchase Periods comprising the Offering Period (as defined in the ESPP) that began October 22, 2018. The reporting person is voluntarily reporting the acquisition of shares of the issuer's common stock pursuant to the Employee Stock Purchase Plan ("ESPP"), for the ESPP Purchase Period (as defined in the ESPP) of February 20, 2019 through August 20, 2019. This transaction is also exempt under Rule 16b-3(c). The Purchase Period ended August 20, 2019 and is the first of two Purchase Periods comprising the Offering Period (as defined in the ESPP) that began February 20, 2019. Yukio Morikubo, Attorney in fact for Denise Masters 2020-02-11