Dennis E. Marshall - 31 Dec 2023 Form 4 Insider Report for BIOLARGO, INC. (BLGO)

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	BLGO	Option to Purchase Common Stock	Award		+111,607	+2.8%		4,108,116	31 Dec 2023	Common Stock	111,607	$0.1680	Direct	F1
transaction	BLGO	Option to Purchase Common Stock	Award		+133,929	+3.3%		4,152,045	31 Dec 2023	Common Stock	133,929	$0.1680	Direct	F2, F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Id	Content
F1	This Option was issued to Reporting Person as payment for $18,750 in fees due to Reporting Person by Issuer in exchange for services on its board of directors for the most recently completed quarterly period, pursuant to the Issuer's 2018 Equity Incentive Plan.
F2	This Option was granted to Reporting Person to replace an option to purchase 90,000 shares that had been issued December 31, 2013 to compensate Reporting Person for services to the Issuer and had recently expired unexercised due to a discrepancy between the original exercise price and current Issuer stock price, pursuant to plan adopted by the Issuer's Compensation Committee.
F3	Total reflects the expiration of options to purchase 90,000 shares that expired on December 31, 2023.