X0202 SCHEDULE 13G/A 0001846412 XXXXXXXX LIVE 1 Common Stock, $0.001 par value per share 06/30/2026 0001420565 Rein Therapeutics, Inc. 00887A204 12407 N. Mopac Expy., Suite 250, #390 Austin TX 78758 Rule 13d-1(c) Lynwood Capital Management Inc. A6 4280500.00 0.00 4280500.00 0.00 4280500.00 N 5.0 CO Ben Shapiro Z4 4280500.00 0.00 4280500.00 0.00 4280500.00 N 5.0 IN Lynwood Opportunities Master Fund E9 4280500.00 0.00 4280500.00 0.00 4280500.00 N 5.0 OO Rein Therapeutics, Inc. 12407 N. Mopac Expy., Suite 250, #390, Austin, TX 78758 This Schedule 13G (this "Statement" or this "Schedule 13G") is being filed by: (1) Lynwood Capital Management Inc., an Ontario corporation (the "Investment Manager"); (2) Ben Shapiro ("Mr. Shapiro"); and (3) Lynwood Opportunities Master Fund, a Cayman Islands entity (the "Fund") (all of the foregoing, collectively, the "Reporting Persons"). The Fund is an investment vehicle. The Fund directly beneficially owns the Common Stock (as defined below) reported in this Statement. The Investment Manager is the investment manager of the Fund. Mr. Shapiro is the President, Chief Executive Officer, Chief Investment Officer, sole director and indirect controlling stockholder of the Investment Manager. Mr. Shapiro and the Investment Manager may be deemed to beneficially own the Common Stock directly beneficially owned by the Fund. Each Reporting Person disclaims beneficial ownership with respect to any Common Stock other than the Common Stock directly beneficially owned by such Reporting Person. The principal business office of the Fund is FG Services Limited, Suite 2206, Cassia Court, 72 Market Street, Camana Bay, P.O. Box 30869, Grand Cayman KY1-1204, Cayman Islands. The principal business office of the Investment Manager and Mr. Shapiro is 200 Bay St, Suite 1304, Royal Bank Plaza, South Tower, Toronto, Ontario M5J 2J1. For citizenship or place of organization see Item 4 of the cover page of each Reporting Person. Y See Item 9 on the cover page for each Reporting Person, and Item 2, which information is given as of the close of business on June 30, 2026, the Date of Event which requires the filing of this Schedule 13G. See Item 11 on the cover page for each Reporting Person. The percentages of beneficial ownership contained herein are based on 85,539,032 shares of Common Stock outstanding as of May 21, 2026, as reported by the Issuer in a Schedule 14A filed with the SEC on June 8, 2026. See Item 5 on the cover page for each Reporting Person. See Item 6 on the cover page for each Reporting Person. See Item 7 on the cover page for each Reporting Person. See Item 8 on the cover page for each Reporting Person. Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above 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. Lynwood Capital Management Inc. /s/ Ben Shapiro 08/14/2026 Ben Shapiro /s/ Ben Shapiro 08/14/2026 Lynwood Opportunities Master Fund /s/ Ben Shapiro 08/14/2026