RTW Investments, LP Reports New 5.2% Stake in iRhythm Holdings, Inc. (IRTC)

On May 15, 2026, RTW Investments, LP, and its Managing Partner, Roderick Wong, M.D., filed a Schedule 13G with the SEC, reporting a new 5.2% ownership stake in iRhythm Holdings, Inc. (IRTC). As of the event date of March 31, 2026, the reporting persons beneficially own 1,668,500 shares of Common Stock. This position was previously reported as zero, indicating a significant new entry into the company's equity. RTW Investments serves as the investment adviser to certain funds that directly hold the shares. Both RTW Investments and Dr. Wong share voting and dispositive power over the entire reported amount. The filing specifies that these securities were acquired in the ordinary course of business and not for the purpose of changing or influencing the control of the issuer. The ownership percentage was calculated based on 32,316,760 shares outstanding as of February 12, 2026. The reporting persons are based in New York and have entered into a joint filing agreement.