X0508 4 2024-12-26 0000880242 BIOLARGO, INC. BLGO 0001361115 Marshall Dennis E 14921 CHESTNUT ST. WESTMINSTER CA 92683 1 0 Option to Purchase Common Stock 0.19 2024-12-26 4 A 0 118422 0 A 2024-12-26 2034-12-26 Common Stock 118422 4525941 D This Option was granted to Reporting Person to replace an option to purchase 64,286 shares that had been issued to compensate Reporting Person for services to the Issuer and had recently expired unexercised due to a discrepancy between the original exercise price and current Issuer stock price, pursuant to plan adopted by the Issuer's Compensation Committee. Total reflects the expiration of options to purchase 64,286 shares that recently expired. /s/ John R. Browning, attorney-in-fact 2024-12-30