Sec Form 4 Filing - CALVERT DENNIS P @ BIOLARGO, INC. - 2020-05-01

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 CALVERT DENNIS P 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 X __ Officer (give title below) _____ Other (specify below) President (Last) (First) (Middle) 14921 CHESTNUT ST. 3. Date of Earliest Transaction (MM/DD/YY) 05/01/2020 (Street) WESTMINSTER, CA92683 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 $ 0.14 05/01/2020 A 50,000 05/01/2020 05/01/2030 Common stock 50,000 $ 0 ( 1 ) 3,846,322 ( 2 ) D Option to purchase common stock $ 0.14 05/01/2020 A 343,571 08/01/2020( 3 ) 05/01/2030 Common stock 343,571 $ 0 ( 4 ) 4,189,893 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other CALVERT DENNIS P 14921 CHESTNUT ST. WESTMINSTER, CA92683 X President Signatures /s/ John R. Browning, Attorney-in-fact 05/05/2020 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This Option was granted to Reporting Person to replace an option to purchase 200,000 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. ( 2 )This amount reflects, in addition to the reported option, grant, the expiration on February 1, 2020, of an option to purchase 200,000 shares of common stock. ( 3 )This option vests in four equal installments every three months beginning August 1, 2020. ( 4 )On May 1, 2020, in recognition of recent accomplishments in response to the COVID-19 pandemic, the Issuer's Compensation Committee granted options to the Issuer's employees under the 2018 Equity Incentive Plan, including the option reported herein.

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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