X0306 4 2021-04-20 0000880242 BIOLARGO, INC. BLGO 0001663146 STROMMEN JACK B. 7108 31ST AVENUE NORTH MINNEAPOLIS MN 55427 1 Common stock 2021-04-20 4 C 0 563035 0.24 A 4878579 D The securities acquired reported herein were issued as payment of principal and interest due on a convertible promissory note issued on March 28, 2018, in the principal amount of $100,000, held by Sanatio Capital, LLC, an entity owned/controlled by Reporting Person. Of this amount, 570,567 shares are held by Sanatio Capital, LLC, an entity owned/controlled by the Reporting Person. /s/ John R. Browning, Attorney-in-fact 2021-04-21