Citadel Advisors LLC Reports New 6.3% Stake in HMH Holding Inc.

On April 9, 2026, Citadel Advisors LLC and its affiliates filed a Schedule 13G reporting a new 6.3% ownership stake in HMH Holding Inc. (HMH). The filing, triggered by an event on April 2, 2026, indicates that the reporting persons collectively hold 665,923 shares of Class A common stock. This joint filing includes Citadel Advisors LLC, Citadel Advisors Holdings LP, Citadel GP LLC, and Kenneth Griffin, who are deemed to have shared voting and dispositive power over the shares. Citadel Multi-Strategy Equities Master Fund Ltd. is the direct owner of the majority of these shares, with Citadel Advisors serving as the portfolio manager. The filing specifies that the securities were acquired for investment purposes and not with the intent to change or influence the control of the issuer. The reported ownership percentage is based on 10,520,000 shares outstanding as of the event date. This position represents a significant new holding for Citadel in the Houston-based issuer.