BlackRock, Inc. Increases Stake in Waystar Holding Corp

BlackRock, Inc. has filed a Schedule 13G with the SEC, disclosing an increased ownership stake in Waystar Holding Corp. As of September 30, 2025, BlackRock beneficially owns 15,925,871 shares of Waystar's common stock, representing 9.1% of the total outstanding shares. This marks a significant increase from their previous holdings, with a 130.65% rise in the number of shares and a 107.74% increase in the value of their investment. BlackRock has sole voting power over 15,729,490 shares and sole dispositive power over all 15,925,871 shares. The filing indicates that these shares were acquired in the ordinary course of business and not for the purpose of influencing control of Waystar. The filing was signed by Spencer Fleming, Managing Director at BlackRock, on October 17, 2025.