Janus Henderson Group plc Reports 3.4% Stake in Ardelyx, Inc. (ARDX) via Schedule 13G/A

On May 15, 2026, Janus Henderson Group plc filed a Schedule 13G/A with the SEC, reporting a 3.4% stake in Ardelyx, Inc. (ARDX). As of the event date on March 31, 2026, the investment firm beneficially owned 8,371,234 shares of common stock. This filing represents an increase in holdings compared to the previously reported 0.0% ownership, indicating a new significant position for the firm. Janus Henderson Group plc serves as the ultimate parent company for various SEC-registered investment advisers, including Janus Henderson Investors US LLC and Janus Henderson Investors UK Limited, which exercise investment and voting discretion over these shares on behalf of managed portfolios. The filing specifies shared voting and dispositive power over the full 8,371,234 shares. The securities were acquired in the ordinary course of business and not for the purpose of influencing or changing control of the issuer. No single managed portfolio under the group's umbrella owns more than 5% of the outstanding common stock.