X0508 4 2025-11-12 0001659617 Moleculin Biotech, Inc. MBRX 0000938419 KLEMP WALTER V C/O MOLECULIN BIOTECH, INC. 5300 MEMORIAL DR., SUITE 950 HOUSTON TX 77007 1 1 CEO and President 0 Stock option (right to buy) 0.49 2025-11-12 4 A 0 830000 A 2035-11-12 Common Stock 830000 3210731 D Performance Based Restricted Stock Units 2025-11-12 4 A 0 750000 A 2035-11-12 Common Stock 750000 3960731 D The stock option set forth in this table vests in four equal annual installments beginning on the first anniversary of the Transaction Date, subject to the grantee's continued service to the Company on each vesting date. Issued in connection with the reporting person's employment with the Company. Each restricted stock unit represents a contingent right to receive one shares of Company common stock. On November 12, 2025, the Board approved this performance based restricted stock unit. The performance based restricted stock units set forth in this table will vest in 20% installments upon the achievement of certain clinical milestones; provided that upon a change of control (as defined in the 2024 Stock Plan) 100% shall vest. /s/ Jonathan P. Foster by Power of Attorney 2025-11-14