Vanguard Capital Management LLC Reports New 5.02% Stake in Rhythm Pharmaceuticals Inc (RYTM)

On April 30, 2026, Vanguard Capital Management LLC filed a Schedule 13G with the SEC, reporting a new 5.02% passive ownership stake in Rhythm Pharmaceuticals Inc (RYTM). As of the event date of March 31, 2026, the firm beneficially owns 3,432,949 shares of common stock. This position represents a significant increase from a previously reported 0% ownership level, crossing the 5% threshold that necessitates a 13G filing. According to the filing, Vanguard Capital Management exercises sole dispositive power over all 3,432,949 shares and sole voting power over 465,124 shares. The filing indicates that the shares were acquired in the ordinary course of business and are not held for the purpose of changing or influencing the control of the issuer. The reported holdings include securities managed by various Vanguard affiliates, including Vanguard Asset Management Limited and Vanguard Global Advisers, LLC. Rhythm Pharmaceuticals is based in Boston, MA, and the securities class involved is Common Stock.