Form 4 Filing for Donald H. Picker

This filing details a Form 4 filed by Donald H. Picker, Chief Science Officer at Moleculin Biotech, Inc. The transaction, dated October 15, 2026, involves the acquisition of 250,000 stock options, granting the right to buy Moleculin Biotech, Inc. Common Stock. These options have an exercise price of $0.3701 and expire on October 15, 2036. The options vest over 18 months, with 50% vesting immediately upon grant and the remainder in 18 equal installments. Following this transaction, Mr. Picker holds 789,595 shares. The options were issued in connection with his employment with the company. The filing is signed by Jonathan P. Foster under Power of Attorney.