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Table of Contents ( Mark One ) ☑ ☐ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ANNUAL REPORT PURSUANT For the Fiscal Year ended December 31 , 2020 OR ΤΟ SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Transition Period from to Commission File Number : 000-19709 BIOLARGO , INC . ( Exact Name of registrant as specified in its Charter ) Delaware ( State or other jurisdiction of incorporation or organization ) 65-0159115 ( IRS Employer Identification No. ) 14921 Chestnut St. , Westminster , CA ( Address of principal executive offices ) 92683 ( Zip Code ) Registrant's telephone number , including area code : ( 888 ) 400-2863 Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Common Stock Trading Symbol ( s ) BLGO Name of each exchange on which registered OTCQB TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 Securities registered under Section 12 ( g ) of the Exchange Act : none Indicate by check mark whether the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes ☐ No ☑