BIOLARGO director receives 92,593-share option grant

BIOLARGO, INC. director Jack B. Strommen received an option grant as compensation for board service.

Rhea-AI Filing Summary

BIOLARGO, INC. director Jack B. Strommen received an option grant as compensation for board service. He was awarded an Option to Purchase Common Stock covering 92,593 shares at an exercise price of $0.162 per share, with no cash paid for the grant itself.

The option was issued in lieu of $15,000 in director fees for the most recently completed quarter under the company’s 2024 Equity Incentive Plan. Following this grant, Strommen directly holds derivative securities representing 2,452,103 underlying shares, and this option is scheduled to expire on March 31, 2036.

Insider Trade Summary

Grant/Award: 92,593 shares

Grant/Award 1 txn

Insider STROMMEN JACK B.

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Option to Purchase Common Stock	92,593	$0.00	$0.00

Holdings After Transaction: Option to Purchase Common Stock — 2,452,103 contracts (Direct)

Footnotes (1)

1. F1. This Option was issued to Reporting Person as payment for $15,000 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 2024 Equity Incentive Plan. The number of shares in the Option is equal to the amount of fees due divided by the exercise price of the Option.

Key Figures

Option grant size: 92,593 shares Exercise price: $0.162 per share Director fees paid in options: $15,000 +2 more

5 metrics

Option grant size 92,593 shares Option to Purchase Common Stock granted as director fees

Exercise price $0.162 per share Strike price of granted BIOLARGO stock option

Director fees paid in options $15,000 Quarterly board fees satisfied via option grant

Post-grant derivative holdings 2,452,103 shares Underlying shares represented by Strommen’s derivative securities after grant

Option expiration date March 31, 2036 Expiration of the granted BIOLARGO stock option

Key Terms

Option to Purchase Common Stock, exercise price, Equity Incentive Plan, board of directors

4 terms

Option to Purchase Common Stock financial

"This Option was issued to Reporting Person as payment for $15,000"

exercise price financial

"equal to the amount of fees due divided by the exercise price of the Option"

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

Equity Incentive Plan financial

"pursuant to the Issuer's 2024 Equity Incentive Plan"

An equity incentive plan is a program that gives employees, executives or directors the right to receive company stock or options to buy stock as part of their pay. Think of it as offering slices of future company profit to motivate people to boost long‑term performance; for investors it matters because it can align employee goals with shareholder value but also increases the number of shares outstanding, which can dilute existing ownership.

board of directors financial

"services on its board of directors for the most recently completed quarterly period"

The Board of Directors is a group of people chosen by a company's owners to help make big decisions and oversee how the company is run. They act like a team of advisors or managers, making sure the company stays on track and meets its goals. Their choices can influence the company's success and how it grows.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 04/01/2026 - 07:47 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

STROMMEN JACK B.

(Last) (First) (Middle)

7108 31ST AVENUE NORTH

(Street)

MINNEAPOLIS MINNESOTA 55427

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
BIOLARGO, INC. [ BLGO ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/31/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Option to Purchase Common Stock	$0.162	03/31/2026		A		92,593		03/31/2026	03/31/2036	Common Stock	92,593	(1)	2,452,103	D

Explanation of Responses:

1. This Option was issued to Reporting Person as payment for $15,000 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 2024 Equity Incentive Plan. The number of shares in the Option is equal to the amount of fees due divided by the exercise price of the Option.

	/s/ John R. Browning, attorney-in-fact	04/01/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)