X0306 4/A 2018-12-31 2019-01-03 0000880242 BIOLARGO, INC. BLGO 0001663146 STROMMEN JACK B. 7108 31ST AVENUE NORTH MINNEAPOLIS MN 55427 1 Option to Purchase Common Stock 0.24 2018-12-31 4 A 0 62500 A 2018-12-31 2028-12-31 Common stock 62500 210856 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 three months ended December 31, 2018, pursuant to the Issuer's 2018 Equity Incentive Plan. This Form 4 is being amended to correct a clerical error by the Issuer in the number of shares issued pursuant to the Option reported in Table II. Reporting Person was notified of such clerical error on January 10, 2019. /s/ John R. Browning, Attorney-in-fact 2019-01-10