X0508 4 2024-06-28 0000880242 BIOLARGO, INC. BLGO 0001361115 Marshall Dennis E 14921 CHESTNUT ST. WESTMINSTER CA 92683 1 0 Option to Purchase Common Stock 0.255 2024-06-28 4 A 0 88237 A 2024-06-28 2034-06-28 Common Stock 88237 4270877 D Option to Purchase Common Stock 0.255 2024-06-30 4 A 0 73529 A 2024-06-30 2034-06-30 Common Stock 73529 4344406 D This Option was granted to Reporting Person to replace an option to purchase 34,616 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 34,616 shares that recently expired. This Option was issued to Reporting Person as payment for $18,750 in fees due to Reporting Person by Issuer in exchange for services on its board of directors for the most recently completed quarterly period, pursuant to the Issuer's 2024 Equity Incentive Plan. /s/ John R. Browning, attorney-in-fact 2024-07-01