X0202 SCHEDULE 13G 0001937147 XXXXXXXX LIVE Common Stock, par value $0.001 05/01/2026 0001420565 Rein Therapeutics, Inc. 00887A204 12407 N. MOPAC EXPY. SUITE 250 #390 AUSTIN TX 78758 Rule 13d-1(c) Funicular Funds, LP DE 5195000.00 0.00 5195000.00 0.00 5195000.00 6.7 PN The reporting person's beneficial ownership consists of 5,195,000 shares of Common Stock (the "Shares") and 420,000 warrants (the "Warrants"). The Warrants are subject to a blocker provision limiting the reporting person's ability to exercise if such exercise would cause the reporting person to beneficially own greater than 4.99% of the Issuer. The foregoing calculation is based upon 78,039,032 Shares outstanding as reported by the Issuer in the Rule 424(b)(5) Prospectus filed with the Securities and Exchange Commission on May 4, 2026. Cable Car Capital, LP DE 5195000.00 0.00 5195000.00 0.00 5195000.00 6.7 IA PN The reporting person's beneficial ownership consists of 5,195,000 Shares and 420,000 Warrants. The Warrants are subject to a blocker provision limiting the reporting person's ability to exercise if such exercise would cause the reporting person to beneficially own greater than 4.99% of the Issuer. The foregoing calculation is based upon 78,039,032 Shares outstanding as reported by the Issuer in the Rule 424(b)(5) Prospectus filed with the Securities and Exchange Commission on May 4, 2026. Cable Car Capital, LP, as the General Partner of Funicular Funds, LP, and Jacob Ma-Weaver, as the Managing Member of Cable Car Capital, LP, may each be deemed the beneficial owner of the Shares held by Funicular Funds, LP. Ma-Weaver Jacob X1 5195000.00 0.00 5195000.00 0.00 5195000.00 6.7 IN The reporting person's beneficial ownership consists of 5,195,000 Shares and 420,000 Warrants. The Warrants are subject to a blocker provision limiting the reporting person's ability to exercise if such exercise would cause the reporting person to beneficially own greater than 4.99% of the Issuer. The foregoing calculation is based upon 78,039,032 Shares outstanding as reported by the Issuer in the Rule 424(b)(5) Prospectus filed with the Securities and Exchange Commission on May 4, 2026. Cable Car Capital, LP, as the General Partner of Funicular Funds, LP, and Jacob Ma-Weaver, as the Managing Member of Cable Car Capital, LP, may each be deemed the beneficial owner of the Shares held by Funicular Funds, LP. Rein Therapeutics, Inc. 12407 N. MOPAC EXPY., SUITE 250 #390, AUSTIN, TEXAS, 78758. Funicular Funds, LP Cable Car Capital, LP Jacob Ma-Weaver 601 California Street, Suite 1151, San Francisco, CA 94108 Funicular Funds, LP - Delaware Cable Car Capital, LP - Delaware Jacob Ma-Weaver - United States Y Funicular Funds, LP - 5,195,000 Cable Car Capital, LP - 5,195,000 Jacob Ma-Weaver - 5,195,000 Funicular Funds, LP - 6.7% Cable Car Capital, LP - 6.7% Jacob Ma-Weaver - 6.7% Funicular Funds, LP - 5,195,000 Cable Car Capital, LP - 5,195,000 Jacob Ma-Weaver - 5,195,000 Funicular Funds, LP - 0 Cable Car Capital, LP - 0 Jacob Ma-Weaver - 0 Funicular Funds, LP - 5,195,000 Cable Car Capital, LP - 5,195,000 Jacob Ma-Weaver - 5,195,000 Funicular Funds, LP - 0 Cable Car Capital, LP - 0 Jacob Ma-Weaver - 0 Y N 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. Exhibit A Funicular Funds, LP Jacob Ma-Weaver 05/07/2026 Cable Car Capital, LP Jacob Ma-Weaver 05/07/2026 Ma-Weaver Jacob Jacob Ma-Weaver 05/07/2026