X0508 4 2025-11-14 0000880242 BIOLARGO, INC. BLGO 0001228572 CALVERT DENNIS P 14921 CHESTNUT ST. WESTMINSTER CA 92683 1 1 President 0 Common Stock 2025-11-14 4 A 0 310269 0.16 A 10393403 D The shares issued are subject to a Lock-Up Agreement dated as of the issuance date whereby shares are locked-up and restricted from sale until the Issuer reports gross revenue of at least $40 million on a consolidated basis for any reported period (e.g, quarter or annual), or the Issuer's market capitalization exceeds $300 million, or there is a "change in control" in the Issuer. Shares received from Issuer in exchange for a reduction in amounts owed by Issuer to Reporting Person for salary and unreimbursed business expenses (equal to the product of the number of shares issued and the acquisition price per share). Includes 1,528,695 shares owned indirectly by Reporting Person through a limited liability company owned and controlled by Reporting Person. /s/ John R. Browning, attorney-in-fact 2025-11-17