X0202 SCHEDULE 13G/A 0001799456-23-000004 0001799456 XXXXXXXX LIVE 2 Common Shares of Beneficial Interest 06/30/2026 0001075415 DIVERSIFIED HEALTHCARE TRUST 25525P107 TWO NEWTON PLACE 255 WASHINGTON STREET, SUITE 300 NEWTON MA 02458 Rule 13d-1(b) FF Hybrid, LP DE 0.00 18054554.00 0.00 18054554.00 18054554.00 7.5 PN Flat Footed LLC DE 0.00 23487002.00 0.00 23487002.00 23487002.00 9.7 IA HC OO Marc Andersen X1 0.00 23487002.00 0.00 23487002.00 23487002.00 9.7 HC IN DIVERSIFIED HEALTHCARE TRUST TWO NEWTON PLACE, 255 WASHINGTON STREET, SUITE 300, NEWTON, MASSACHUSETTS, 02458. FF Hybrid, LP Flat Footed LLC Marc Andersen FF Hybrid, LP c/o Flat Footed LLC 3415 North Pines Way, Suite 205 Wilson, WY 83014 Flat Footed LLC 3415 North Pines Way, Suite 205 Wilson, WY 83014 Marc Andersen c/o Flat Footed LLC 3415 North Pines Way, Suite 205 Wilson, WY 83014 FF Hybrid, LP - DE Flat Footed LLC - DE Marc Andersen - USA N IA HC Flat Footed LLC is an investment adviser that is registered under the Investment Advisers Act of 1940. Flat Footed LLC, which serves as the investment manager to FF Hybrid, LP and various private funds (collectively, the "Funds"), which holds securities for the benefit of their investors and Mr. Marc Andersen, as Managing Member of Flat Footed LLC, with the power to exercise investment and voting discretion, may be deemed to be the beneficial owner of all shares of Common Stock held by the Funds. Pursuant to Rule 13d-4 under the Securities Exchange Act of 1934, as amended, each of the Funds expressly disclaim beneficial ownership over any of the securities reported in this statement, and the filing of this statement shall not be construed as an admission that any of the Funds are the beneficial owner of any of the securities reported herein. FF Hybrid, LP - 18,054,554 Flat Footed LLC - 23,487,002 Marc Andersen - 23,487,002 Ownership percentage is based on 242,106,926 shares of Common Stock outstanding as of April 30, 2026, as represented by the Issuer in the Form 10-Q filed with the Securities and Exchange Commission on May 4, 2026. FF Hybrid, LP - 7.5% Flat Footed LLC - 9.7% Marc Andersen - 9.7% FF Hybrid, LP - 0 Flat Footed LLC - 0 Marc Andersen - 0 FF Hybrid, LP - 18,054,554 Flat Footed LLC - 23,487,002 Marc Andersen - 23,487,002 FF Hybrid, LP - 0 Flat Footed LLC - 0 Marc Andersen - 0 FF Hybrid, LP - 18,054,554 Flat Footed LLC - 23,487,002 Marc Andersen - 23,487,002 Y N The Funds have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the shares of Common Stock covered by this Statement. N See Note above. Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. FF Hybrid, LP /s/ Marc Andersen 08/14/2026 Flat Footed LLC /s/ Marc Andersen 08/14/2026 Marc Andersen /s/ Marc Andersen 08/14/2026