Company · CIK 0000880242 · SIC 2800 — Chemicals & Allied Products · OTC

BIOLARGO, INC. · BLGO

Insider activity reported against this company. All insider holders · On EDGAR ↗

Period1M 3M 6M 1Y 2Y All datashares as filed — not split-adjusted

Open-market buys & salesbuys $60k · 2sales $0 · 0net $60k

Reported at this company — common stock

Trade	Reported (ET)	Insider	Shares	Avg price	Total	Owned after	Δ stake	Flags
Jul 7, 2026 AForm 4 →	Jul 7, 6:01 pm EDT	Kenneth Reay CodeChief Science Officer, Director	532,567	$0.1135	$60,446	26,408,319	—
Jun 30, 2026 AForm 4 →	Jul 2, 8:40 pm EDT	Dennis P CalvertPresident, Director	919,483	$0.1134	$104,251	11,058,108	—
Dec 31, 2018 AGForm 4 →	Jan 3, 2019, 6:28 pm EST	Dennis P CalvertPresident, Director	253,956	$0.24	$60,949	8,609,581	—	plan?
Dec 31, 2018 AForm 4 →	Jan 3, 2019, 6:26 pm EST	Kenneth Reay CodeChief Science Officer, Director, 10% Owner	202,845	$0.24	$48,683	22,806,703	—	plan?
Sep 30, 2018 AForm 4 →	Oct 2, 7:24 pm EDT	Kenneth Reay CodeChief Science Officer, Director, 10% Owner	130,187	$0.27	$35,150	22,603,858	—	plan?
Sep 30, 2018 AForm 4 →	Oct 2, 4:56 pm EDT	Dennis P CalvertPresident, Director	119,071	$0.27	$32,149	8,505,625	—	plan?
Jul 5, 2018 AForm 4 →	Jul 9, 5:20 pm EDT	Kenneth Reay CodeChief Science Officer, Director, 10% Owner	90,553	$0.43	$38,938	22,473,671	—	plan?
Jul 5, 2018 AForm 4 →	Jul 9, 5:15 pm EDT	Dennis P CalvertPresident, Director	86,397	$0.43	$37,151	8,386,554	—	plan?
Jun 29, 2018 CForm 4 →	Jul 9, 11:03 am EDT	Jack B. StrommenDirector	7,532	$0.37	$2,787	4,315,544	—	plan? late
May 18, 2018 CForm 4 →	May 22, 2:40 pm EDT	Jack B. StrommenDirector	2,201,714	$0.30	$660,514	4,308,012	—	plan?
May 2, 2018 CForm 4 →	May 4, 2:52 pm EDT	Jack B. StrommenDirector	1,450,400	$0.25	$362,600	2,106,298	—	plan?
Mar 31, 2018 AForm 4 →	Apr 3, 2:52 pm EDT	Dennis P CalvertPresident, Director	150,197	$0.259	$38,901	8,300,157	—	plan?
Mar 31, 2018 AForm 4 →	Apr 3, 2:24 pm EDT	Kenneth Reay CodeChief Science Officer, Director, 10% Owner	172,833	$0.259	$44,764	22,383,118	—	plan?
Mar 23, 2018 PForm 4 →	Mar 27, 3:51 pm EDT	Jack B. StrommenDirector	110,636	$0.2675	$29,595	655,898	+20.3%	plan?
Jan 3, 2018 AForm 4 →	Jan 3, 6:21 pm EST	Jack B. StrommenDirector	72,179	$0.4145	$29,918	545,262	—	plan?
Dec 31, 2017 AForm 4 →	Jan 3, 2018, 6:22 pm EST	Kenneth Reay CodeChief Science Officer, Director, 10% Owner	71,273	$0.39	$27,796	22,210,285	—	plan?
Dec 31, 2017 AForm 4 →	Jan 3, 2018, 6:20 pm EST	Dennis P CalvertPresident, Director	77,432	$0.39	$30,198	8,149,960	—	plan?
Oct 12, 2017 GForm 4 →	Oct 16, 4:06 pm EDT	Dennis P CalvertPresident, Director	435,000	—	—	8,072,528	—	plan?
Oct 12, 2017 GForm 4 →	Oct 16, 4:06 pm EDT	Kenneth Reay CodeChief Science Officer, Director, 10% Owner	120,637	—	—	22,139,012	—	plan?
Sep 20, 2017 PForm 4 →	Oct 5, 5:08 pm EDT	Jack B. StrommenDirector	61,792	$0.4895	$30,247	473,083	+15.0%	plan? late
May 2, 2017 AForm 4/A →	Jun 2, 7:12 pm EDT	Dennis P CalvertPresident, Director	1,500,000	$0.45	$675,000	8,507,528	—	plan?
May 2, 2017 AForm 4 →	May 4, 6:04 pm EDT	Dennis P CalvertPresident, Director	1,500,000	$0.45	$675,000	8,507,528	—	plan? amended
Apr 30, 2017 MForm 4 →	May 2, 8:34 pm EDT	Dennis P CalvertPresident, Director	2,501,937	$0.18	$450,349	7,007,528	—	plan?
Dec 1, 2016 GForm 4/A →	Feb 14, 2017, 4:23 pm EST	Kenneth Reay CodeChief Science Officer, Director, 10% Owner	2,490,327	—	—	22,259,649	—	plan?
Dec 1, 2016 GForm 4 →	Dec 2, 6:16 pm EST	Dennis P CalvertPresident, Director	350,000	—	—	4,020,591	—	plan?
Dec 1, 2016 GForm 4 →	Dec 2, 6:15 pm EST	Kenneth Reay CodeChief Science Officer, Director, 10% Owner	2,490,327	—	—	21,763,380	—	plan? amended
Sep 7, 2016 GForm 4 →	Sep 8, 5:53 pm EDT	Kenneth Reay CodeChief Science Officer, Director, 10% Owner	500,000	—	—	24,253,707	—	plan?
Dec 31, 2015 AForm 4 →	Jan 5, 2016, 8:18 pm EST	Joseph L ProvenzanoSecretary, Director	20,686	—	—	1,270,743	—	plan?
Oct 29, 2015 GForm 4 →	Nov 2, 3:53 pm EST	Dennis P CalvertPresident, Director	112,000	—	—	4,370,591	—	plan?
Oct 12, 2015 GForm 4 →	Oct 15, 7:03 pm EDT	Dennis P CalvertPresident, Director	16,835	$0.60	$10,101	4,482,591	—	plan? late
Sep 24, 2015 AForm 4 →	Sep 25, 4:17 pm EDT	Joseph L ProvenzanoSecretary, Director	29,389	—	—	1,250,057	—	plan?
Sep 22, 2015 AForm 4 →	Sep 24, 5:52 pm EDT	Dennis P CalvertPresident, Director	58,223	—	—	4,499,426	—	plan?
Sep 22, 2015 AForm 4 →	Sep 24, 3:27 pm EDT	Kenneth Reay CodeChief Science Officer, Director, 10% Owner	69,618	—	—	24,753,707	—	plan?
Jun 29, 2015 AForm 4 →	Jul 1, 7:47 pm EDT	Dennis P CalvertPresident, Director	104,571	—	—	4,441,203	—	plan?
Jun 29, 2015 AForm 4 →	Jul 1, 7:41 pm EDT	Kenneth Reay CodeChief Science Officer, Director, 10% Owner	108,743	—	—	24,684,089	—	plan?
Jun 29, 2015 AForm 4 →	Jul 1, 7:39 pm EDT	Joseph L ProvenzanoSecretary, Director	65,629	—	—	1,220,668	—	plan?
Mar 30, 2015 AForm 4 →	Apr 1, 6:38 pm EDT	Dennis P CalvertPRESIDENT, Director	71,608	—	—	4,336,632	—	plan?
Mar 30, 2015 AForm 4 →	Apr 1, 6:29 pm EDT	Joseph L ProvenzanoSECRETARY, Director	52,239	—	—	1,155,039	—	plan?
Mar 30, 2015 AForm 4 →	Apr 1, 6:04 pm EDT	Kenneth Reay CodeCHIEF SCIENCE OFFICER, Director, 10% Owner	158,131	—	—	24,575,346	—	plan?
Dec 30, 2014 AForm 4 →	Jan 2, 2015, 3:02 pm EST	Joseph L ProvenzanoSecretary, Director	47,684	—	—	1,102,800	—	plan?
Dec 30, 2014 AForm 4 →	Jan 2, 2015, 2:56 pm EST	Kenneth Reay CodeChief Science Officer, Director, 10% Owner	137,143	—	—	24,417,215	—	plan?
Dec 30, 2014 AGForm 4 →	Jan 2, 2015, 2:50 pm EST	Dennis P CalvertPresident & CEO, Director, 10% Owner	692,617	—	—	4,265,024	—	plan?

Reported at this company — derivatives (options, RSUs, warrants)

Trade	Reported (ET)	Insider	Shares	Avg price	Total	Owned after	Δ stake	Flags
Dec 30, 2014 AForm 4 →	Jan 2, 2015, 3:07 pm EST	Gary Adrian CoxDirector	42,857	—	—	913,613	—
Apr 30, 2008 AJForm 5 →	Jan 16, 2019, 7:01 pm EST	Charles K DarganChief Financial Officer	440,000	—	—	2,906,000	—