Rein Therapeutics, Inc. reported on March 2, 2026, that on February 24 and 27, 2026, it entered into agreements to raise $2,300,000 through the issuance of unsecured promissory notes totaling $2,875,000, with a 20% discount. The notes mature on or before June 30, 2026, or upon the closing of another securities sale raising at least $10,000,000.