X0306 4 2017-12-01 false 0001114995 IMPINJ INC PI 0001679785 FEIN EVAN 400 FAIRVIEW AVE N. SUITE 1200 SEATTLE WA 98109 false true false false Chief Financial Officer COMMON STOCK 2017-12-01 4 M false 3300 1.2 A 15100 D COMMON STOCK 2017-12-01 4 S false 3300 25.1906 D 11800 D STOCK OPTION (RTB) 1.2 2017-12-01 4 M false 3300 0 D 2022-08-07 COMMON STOCK 3300 17450 D The option became fully vested on July 1, 2016. The sales reported by Mr. Fein were effected pursuant to a Rule 10b5-1 trading plan adopted on December 14, 2016. The "Amount" and "Price" reported in this Column 4 reflect the aggregate number and weighted-average sale price, respectively, of shares sold. These shares were sold in multiple trasactions at prices ranging from $25.0001 to $25.27, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth herein. Yukio Morikubo as Attorney in fact for Evan Fein 2017-12-05