X0609 4 2026-03-31 0000880242 BIOLARGO, INC. BLGO 0001663146 STROMMEN JACK B. false 7108 31ST AVENUE NORTH MINNEAPOLIS MN 55427 1 0 Option to Purchase Common Stock 0.162 2026-03-31 4 A 0 92593 A 2026-03-31 2036-03-31 Common Stock 92593 2452103 D This Option was issued to Reporting Person as payment for $15,000 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. The number of shares in the Option is equal to the amount of fees due divided by the exercise price of the Option. /s/ John R. Browning, attorney-in-fact 2026-04-01