X0609 4 2026-06-22 0000880242 BIOLARGO, INC. BLGO 0001361115 Marshall Dennis E false 14921 CHESTNUT ST. WESTMINSTER CA 92683 1 0 Option to Purchase Common Stock 0.11 2026-06-22 4 A 0 40909 A 2026-06-22 2036-06-22 Common Stock 40909 5463738 D This Option was granted to Reporting Person to replace an option to purchase 10,000 shares that had been issued to compensate Reporting Person for services on the board of directors to the Issuer and had expired unexercised due to a discrepancy between the original exercise price and Issuer's current stock price, pursuant to plan adopted by the Issuer's Compensation Committee. Total reflects the expiration of options to purchase 10,000 shares that expired June 20, 2026. /s/ John R. Browning, attorney-in-fact 2026-06-24