Sec Form 4 Filing - DARGAN CHARLES K @ BIOLARGO, INC. - 2021-03-18

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

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, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person DARGAN CHARLES K 2. Issuer Name and Ticker or Trading Symbol BIOLARGO, INC. [ BLGO] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Financial Officer (Last) (First) (Middle) 18851 NE 29TH AVENUE, SUITE 700 3. Date of Earliest Transaction (MM/DD/YY) 03/18/2021 (Street) AVENTURA, FL3318 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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 of Derivative Security: 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 $ 0.174 03/18/2021 A 300,000 03/18/2021( 2 ) 03/18/2031 Common stock 300,000 $ 0 ( 3 ) 3,626,500 ( 1 ) D Option to purchase common stock $ 0.18 05/21/2021 A 2,500 05/21/2021 05/21/2031 Common stock 2,500 $ 0 ( 4 ) 3,629,000 D Option to purchase common stock $ 0.18 05/21/2021 A 30,000 05/21/2021 05/21/2031 Common stock 30,000 $ 0 ( 5 ) 3,659,000 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other DARGAN CHARLES K 18851 NE 29TH AVENUE SUITE 700 AVENTURA, FL3318 Chief Financial Officer Signatures /s/ John R. Browning, Attorney-in-fact 05/24/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This amount reflects, in addition to the reported option grant, the expiration, during the first quarter of 2021, of options to purchase an an aggregate 130,000 shares of common stock. ( 2 )The Option is exercisable according to its vesting schedule: (i) 25,000 shares vested as of March 18, 2021, and then (ii) in equal monthly installments of 25,000 shares beginning April 18, 2021, so long as the Engagement Extension Agreement dated March 18, 2021, between Reporting Owner and Issuer, remains in force and effect. ( 3 )This Option was issued to the Reporting Person as compensation to serve as Issuer's Chief Financial Officer from January 31, 2021, through January 31, 2022. ( 4 )This Option was granted to Reporting Person to replace an option to purchase 10,000 shares that had been issued approximately 10 years ago 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. ( 5 )This Option was granted to Reporting Person to replace an option to purchase 120,000 shares that had been issued approximately 10 years ago 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.

Remarks: The option issued to Reporting Person on March 18, 2021, reported herein on line one of Table II, was issued as compensation for service as Issuer's Chief Financial Officer, and was reported by Issuer on Form 8-K filed with the SEC on March 19, 2021.

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).

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