X0306 5 2019-12-31 0 0 0000880242 BIOLARGO, INC. BLGO 0001112799 DARGAN CHARLES K 18851 NE 29TH AVENUE SUITE 700 AVENTURA FL 3318 1 Chief Financial Officer Common Stock 190244 D Option to Purchase Common Stock 0.40 2019-09-30 5 J 0 L 10000 0 D 2009-09-30 2019-09-30 Common stock 10000 3129000 D Option to Purchase Common Stock 0.45 2019-11-02 5 J 0 L 10000 0 D 2009-11-02 2019-11-02 Common stock 10000 3119000 D Option to Purchase Common Stock 0.57 2019-11-30 5 J 0 L 10000 0 D 2009-11-30 2019-11-30 Common stock 10000 3109000 D Option to Purchase Common Stock 0.70 2019-12-31 5 J 0 L 10000 0 D 2009-12-31 2019-12-31 Common stock 10000 3099000 D This transaction reports the expiration, without exercise, of an Option to purchase common stock issued by Issuer to Reporting Person. This Option was originally issued to the Reporting Person as compensation to serve as Issuer's Chief Financial Officer during the time period specific in the Engagement Agreement between the Reporting Person and the Issuer in effect on the date the Option was issued. /s/ John R. Browning, Attorney-in-fact 2020-02-27