Blackford Quentin S. 4

What Happened

• Quentin S. Blackford, President & CEO and Director of iRhythm Holdings (IRTC), had 46,687 performance restricted stock units (RSUs) vest on Feb 24, 2026 (acquired at $0.00) and sold 25,540 of those shares in an open-market/private sale on Feb 25, 2026 for $135.42 each, generating proceeds of $3,458,599. The remaining vested shares were retained (filing does not state total shares held after the sale).

Key Details

• Transaction types: A (award/acquisition) and S (sale)
• Acquisition: 46,687 shares on 2026-02-24 at $0.00 (performance RSUs vested)
• Sale: 25,540 shares on 2026-02-25 at $135.42; proceeds ≈ $3,458,599
• Footnote F1: Vesting resulted from the Compensation & Human Capital Management Committee determining performance conditions were met for RSUs granted 2/27/2023.
• Footnote F2: The sale was to cover tax withholding and remittance obligations related to the RSU vesting.
• Filing: Report filed 2026-02-26 (period of report 2026-02-24). Filing appears timely (within the Form 4 reporting window).
• Shares owned after transaction: Not specified in the provided filing.

Context

• The acquisition here reflects performance RSUs vesting (not a cash purchase); the subsequent sale was used to satisfy tax withholding obligations rather than an independent investment decision. Note also the company completed a holding company reorganization on Jan 12, 2026 converting prior iRhythm Technologies securities to iRhythm Holdings one-for-one with no change in holders' proportional ownership.