Award4

BIOLARGO, INC.

Total Value

$41.2K

Filing Date

Oct 2, 2026

1 transactions

Trade Summary

On Sep 30, 2026, Marshall Dennis E, Director, reported $41.2K of BIOLARGO, INC. (BLGO) across 1 transactions. The filing covers company securities and reflects balanced net activity of $0. Reported prices ranged from $0.08. Insider transactions are sourced from SEC Form 4 disclosures and should be reviewed alongside company fundamentals and the insider's broader trading history.

Insider Information

Name: Marshall Dennis E
Role: Director
Location: WESTMINSTER, CA

Filing Details

Filing Date: Oct 2, 2026
Transaction Date: Sep 30, 2026
Accession Number: 0001437749-26-031933
Form Type: 4

Derivative Transactions

Date	Security	Shares	Exercise Price	Type	Value
Sep 30, 2026	BLGO derivative	281,248	$0.08	Grant/Award	$22.5K
Sep 30, 2026	BLGO derivative	234,375	$0.08	Grant/Award	$18.8K

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Footnotes

(F1)This Option was granted to Reporting Person to replace an option to purchase 29,605 shares that had been issued to compensate Reporting Person for services to the Issuer and had expired unexercised due to a discrepancy between the original exercise price and Issuer's current stock price, pursuant to plan adopted by the Issuer's Compensation Committee.
(F2)Total reflects the expiration of options to purchase 29,605 shares that expired unexercised on September 30, 2026.
(F3)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. The number of shares in the Option is equal to the amount of fees due divided by the exercise price of the Option.

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^*

Marshall Dennis E

(Last)

(First)

(Middle)

14921 CHESTNUT ST.

(Street)

WESTMINSTER

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)
09/30/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Option to Purchase Common Stock	$0.08	09/30/2026		A		281,248		09/30/2026	09/30/2036	Common Stock	281,248	⁽¹⁾	6,056,317⁽²⁾	D
Option to Purchase Common Stock	$0.08	09/30/2026		A		234,375		09/30/2026	09/30/2036	Common Stock	234,375	⁽³⁾	6,290,692	D

Explanation of Responses:

1. This Option was granted to Reporting Person to replace an option to purchase 29,605 shares that had been issued to compensate Reporting Person for services to the Issuer and had expired unexercised due to a discrepancy between the original exercise price and Issuer's current stock price, pursuant to plan adopted by the Issuer's Compensation Committee.

2. Total reflects the expiration of options to purchase 29,605 shares that expired unexercised on September 30, 2026.

3. 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. 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	10/02/2026
	** 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 as rendered by the SEC from accession 0001437749-26-031933.

BIOLARGO, INC.

Trade Summary

Company Information

Insider Information

Filing Details

Derivative Transactions

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Footnotes

SEC Form 4

SEC Filing

SEC Form 4