[Form 4] BIOLARGO, INC. Insider Trading Activity

Rhea-AI Filing Summary

Linda Park, a director of Biolargo, Inc. (BLGO), received 110,294 stock options on 09/30/2025 at a $0.17 exercise price that vest/exercise beginning 09/30/2025 and expire 09/30/2035. The filing shows she now directly beneficially owns 1,164,025 shares of common stock after the reported transaction. The options were issued as payment for $18,750 of board fees under the Issuer's 2024 Equity Incentive Plan. The Form 4 was filed by one reporting person and signed by an attorney-in-fact on 10/02/2025.

Positive

• Director alignment: Linda Park received equity tied to board service, aligning interests with shareholders
• Clear disclosure: Filing reports exact option grant (110,294) and post-transaction holdings (1,164,025)
• Cash conservation: $18,750 in fees were paid via options, preserving issuer cash

Negative

• None.

Insights

Corporate Governance Analyst

Director received equity-based compensation tied to board service.

The report documents a non-cash option grant to a director as payment for $18,750 of board fees under the company’s 2024 Equity Incentive Plan, aligning director remuneration with shareholder outcomes. The director’s reported beneficial ownership of 1,164,025 shares is now explicit in public records, which is relevant for evaluating insider alignment and voting power.

Executive Compensation Specialist

Options granted have a low exercise price and a long ten-year term.

The options carry a $0.17 exercise price and expire 09/30/2035, indicating long-dated incentive compensation. The grant size of 110,294 options was provided in lieu of $18,750 cash fees, showing the company uses equity to conserve cash while compensating directors.

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).

1. Name and Address of Reporting Person^*

Park Linda

(Last) (First) (Middle)

14921 CHESTNUT ST.

(Street)

WESTMINSTER CA 92683

(City) (State) (Zip)

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)

3. Date of Earliest Transaction (Month/Day/Year)
09/30/2025

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

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

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

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	$0.17	09/30/2025		A		110,294		09/30/2025	09/30/2035	Common Stock	110,294	(1)	1,164,025	D

Explanation of Responses:

1. 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 2024 Equity Incentive Plan.

	/s/ John R. Browning, attorney-in-fact	10/02/2025
	** 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.

FAQ

Who filed the Form 4 for BLGO and what is the reporting person's role?

The Form 4 was filed for Linda Park, who is identified as a director of Biolargo, Inc.

What security and amount were acquired on 09/30/2025 for BLGO insider Linda Park?

Linda Park was issued 110,294 options to purchase common stock on 09/30/2025.

What is the exercise price and term of the options reported in the BLGO Form 4?

The options have a $0.17 exercise price and an expiration date of 09/30/2035.

How many BLGO shares does Linda Park beneficially own after the transaction?

The Form 4 shows Linda Park beneficially owns 1,164,025 shares following the reported transaction.

Why were the options issued to Linda Park according to the filing?

The options were issued as payment for $18,750 in fees due to the reporting person for board services, under the 2024 Equity Incentive Plan.