X0306 4 2018-03-28 0000880242 BIOLARGO, INC. BLGO 0001663146 STROMMEN JACK B. 7108 31ST AVENUE NORTH MINNEAPOLIS MN 55427 1 Convertible Promissory Note 0.30 2018-03-28 4 P 0 100000 100000 A 2018-03-28 2021-04-20 Common stock 333333 100000 I Securities held by Sanatio Capital, LLC. Warrant to Purchase Common Stock 0.48 2018-03-28 4 P 0 333333 A 2018-03-28 2023-04-20 Common stock 333333 3590476 I Securities held by Sanatio Capital, LLC. The maturity date of the Convertible Promissory Note is April 20, 2021. Represents the amount of cash investment and the principal amount due on the Convertible Promissory Note reported herein. The reported Warrant to Purchase Common Stock was received as part of a unit associated with a $100,000 investment by Reporting Person into Issuer's private securities offering, along with the Convertible Promissory Note reported herein. No separate consideration was given for the warrant. Includes warrants to purchase 3,257,143 common stock held by Reporting Person directly. Does not include 82,138 shares of Issuer's common stock purchasable by Reporting Person pursuant to Options. The Convertible Promissory Note and Warrant reported in Table II were purchased as part of a unit in the issuer's private securities offering titled Spring 2018 Offering. /s/ John R. Browning, Attorney in fact 2018-03-30