X0609 4 2026-05-27 0 0001388658 iRhythm Holdings, Inc. IRTC 0001188264 MCGINNIS KAREN K false C/O IRHYTHM HOLDINGS, INC. 699 8TH STREET, #600 SAN FRANCISCO CA 94103 1 0 0 0 0 Common Stock 2026-05-27 4 A 0 1573 0 A 3608 D These securities are restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of IRTC Common Stock. The vesting occurs on the earlier of (i) one year after grant or the (ii) the date of the company's next annual meeting. (1) On January 12, 2026, iRhythm Technologies, Inc. (iRhythm Tech) and iRhythm Holdings, Inc. (Issuer) effectuated a holding company reorganization pursuant to which the Issuer became the successor issuer to iRhythm Tech pursuant to Rule 12g-3(a) of the Securities Exchange Act of 1934, as amended. On such date, all outstanding shares and equity awards of iRhythm Tech automatically converted into securities of the Issuer on a one for one basis, with no change to the proportionate interests of security holders. (2) Exhibit 24 - Power of Attorney /s/ Marc Rosenbaum, attorney-in-fact 2026-05-29