X0306 4 2018-02-27 0 0001388658 iRhythm Technologies, Inc. IRTC 0001670118 Sung Derrick C/O IRHYTHM TECHNOLOGIES, INC. 650 TOWNSEND STREET, SUITE 500 SAN FRANCISCO CA 94103 0 1 0 0 See Remarks Common Stock 2018-02-27 4 A 0 3700 0.00 A 14541 D Employee Stock Option (right to buy) 63.95 2018-02-27 4 A 0 8000 0.00 A 2028-02-27 Common Stock 8000 8000 D The reported securities are represented by restricted stock units ("RSUs"), which represents a contingent right to receive one share of IRTC common stock. The RSUs vest in four equal annual installments beginning on March 1, 2019. Includes 1,182 shares acquired under the IRTC employee stock purchase plan on December 1, 2017. Includes 1,759 shares acquired under the IRTC employee stock purchase plan on June 1, 2017. The option vests and the shares become exercisable according to the following schedule: 1/4 on March 1, 2019 and 1/36 of the remaining shares on each full calendar month thereafter. EVP, Strategy and Corporate Development Exhibit List Exhibit 24 - Power of Attorney /s/ Kristen Blumenthal, attorney in fact 2018-03-01