X0306 4 2019-03-01 0 0001388658 iRhythm Technologies, Inc. IRTC 0001385014 King Kevin M C/O IRHYTHM TECHNOLOGIES, INC. 650 TOWNSEND STREET, SUITE 500 SAN FRANCISCO CA 94103 0 1 0 0 President and CEO Common Stock 2019-03-01 4 F 0 6626 97.34 D 224384 D Represents shares that have been withheld by the Issuer to satisfy income tax withholding and remittance obligations in connection with the vesting and net settlement of restricted stock units previously reported. Kristen Blumenthal, attorney in fact 2019-03-05