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
Jun 30, 2026 AForm 4 →	Jul 2, 7:41 pm EDT	Jack B. StrommenDirector	132,159	—	—	2,584,262	—
Jun 30, 2026 AForm 4 →	Jul 2, 6:42 pm EDT	Linda ParkDirector	165,198	—	—	1,546,700	—
Jun 30, 2026 AForm 4 →	Jul 2, 6:30 pm EDT	Christina Elaine BrayDirector	165,198	—	—	1,546,700	—
Jun 30, 2026 AForm 4 →	Jul 2, 6:21 pm EDT	Dennis E MarshallDirector	313,979	—	—	5,804,674	—
Jun 22, 2026 AForm 4 →	Jun 24, 6:21 pm EDT	Dennis E MarshallDirector	40,909	—	—	5,463,738	—
Jan 16, 2019 AForm 4 →	Jan 18, 3:22 pm EST	Charles K DarganChief Financial Officer	300,000	—	—	3,206,000	—
Dec 31, 2018 AForm 4/A →	Jan 10, 2019, 5:52 pm EST	Jack B. StrommenDirector	62,500	—	—	210,856	—
Dec 31, 2018 AForm 4/A →	Jan 10, 2019, 5:51 pm EST	Dennis E MarshallDirector	78,125	—	—	2,387,536	—
Dec 31, 2018 AForm 4/A →	Jan 10, 2019, 5:51 pm EST	John S. RunyanDirector	78,125	—	—	1,309,234	—
Dec 31, 2018 AForm 4/A →	Jan 10, 2019, 5:51 pm EST	Kent Charles Roberts IIDirector	62,500	—	—	1,241,945	—
Dec 31, 2018 AForm 4 →	Jan 3, 2019, 6:17 pm EST	Dennis E MarshallDirector	156,250	—	—	2,465,661	—	amended
Dec 31, 2018 AForm 4 →	Jan 3, 2019, 6:15 pm EST	Kent Charles Roberts IIDirector	125,000	—	—	1,304,445	—	amended
Dec 31, 2018 AForm 4 →	Jan 3, 2019, 6:12 pm EST	John S. RunyanDirector	156,250	—	—	1,387,359	—	amended
Dec 31, 2018 AForm 4 →	Jan 3, 2019, 6:10 pm EST	Jack B. StrommenDirector	125,000	—	—	273,356	—	amended
Sep 30, 2018 AForm 4 →	Oct 2, 4:57 pm EDT	Dennis E MarshallDirector	69,444	—	—	2,309,411	—
Sep 30, 2018 AForm 4 →	Oct 2, 4:57 pm EDT	Kent Charles Roberts IIDirector	55,556	—	—	1,179,445	—
Sep 30, 2018 AForm 4 →	Oct 2, 4:57 pm EDT	John S. RunyanDirector	69,444	—	—	1,231,109	—
Sep 30, 2018 AForm 4 →	Oct 2, 4:56 pm EDT	Jack B. StrommenDirector	55,556	—	—	148,356	—
Jun 29, 2018 AForm 4/A →	Jul 9, 5:10 pm EDT	John S. RunyanDirector	43,605	—	—	1,161,665	—
Jun 29, 2018 AForm 4 →	Jul 9, 11:03 am EDT	Jack B. StrommenDirector	34,884	—	—	92,800	—	late
Jun 29, 2018 AForm 4 →	Jul 3, 1:29 pm EDT	Kent Charles Roberts IIDirector	34,884	—	—	1,123,889	—
Jun 29, 2018 AForm 4 →	Jul 3, 1:28 pm EDT	John S. RunyanDirector	43,605	—	—	1,180,047	—	amended
Jun 29, 2018 AForm 4 →	Jul 3, 1:22 pm EDT	Dennis E MarshallDirector	43,605	—	—	2,239,967	—
May 18, 2018 CForm 4 →	May 22, 2:40 pm EDT	Jack B. StrommenDirector	—	—	—	—	—
May 2, 2018 CForm 4 →	May 4, 2:52 pm EDT	Jack B. StrommenDirector	—	—	—	—	—
Mar 31, 2018 AForm 4 →	Apr 3, 2:51 pm EDT	Kent Charles Roberts IIDirector	57,916	—	—	1,089,005	—
Mar 31, 2018 AForm 4 →	Apr 3, 2:07 pm EDT	Jack B. StrommenDirector	57,916	—	—	140,054	—
Mar 31, 2018 AForm 4 →	Apr 3, 1:59 pm EDT	John S. RunyanDirector	72,394	—	—	1,136,442	—
Mar 31, 2018 AForm 4 →	Apr 3, 1:45 pm EDT	Dennis E MarshallDirector	72,394	—	—	2,196,362	—
Mar 28, 2018 PForm 4 →	Mar 30, 2:48 pm EDT	Jack B. StrommenDirector	333,333	—	—	3,590,476	—
Dec 31, 2017 AForm 4 →	Jan 3, 2018, 6:23 pm EST	Kent Charles Roberts IIDirector	38,462	—	—	1,031,089	—
Dec 31, 2017 AForm 4 →	Jan 3, 2018, 6:22 pm EST	John S. RunyanDirector	48,077	—	—	1,064,048	—
Dec 31, 2017 AForm 4 →	Jan 3, 2018, 6:21 pm EST	Jack B. StrommenDirector	38,462	—	—	82,138	—
Dec 31, 2017 AForm 4 →	Jan 3, 2018, 5:57 pm EST	Dennis E MarshallDirector	48,077	—	—	2,123,968	—
Oct 23, 2017 AForm 4 →	Oct 24, 4:32 pm EDT	Joseph L ProvenzanoSecretary, Director	100,000	—	—	926,203	—
Sep 30, 2017 AForm 4/A →	Oct 4, 6:21 pm EDT	John S. RunyanDirector	36,765	—	—	997,589	—
Sep 30, 2017 AForm 4/A →	Oct 4, 6:21 pm EDT	Dennis E MarshallDirector	36,765	—	—	2,057,509	—
Sep 30, 2017 AForm 4/A →	Oct 4, 6:21 pm EDT	Kent Charles Roberts IIDirector	29,412	—	—	992,627	—
Sep 30, 2017 AForm 4 →	Oct 4, 5:59 pm EDT	Jack B. StrommenDirector	29,412	—	—	43,676	—	late
Sep 30, 2017 AForm 4 →	Oct 3, 5:26 pm EDT	Kent Charles Roberts IIDirector	44,118	—	—	1,007,333	—	amended
Sep 30, 2017 AForm 4 →	Oct 3, 5:25 pm EDT	John S. RunyanDirector	55,147	—	—	1,015,971	—	amended
Sep 30, 2017 AForm 4 →	Oct 3, 5:20 pm EDT	Dennis E MarshallDirector	55,147	—	—	2,075,891	—	amended
Jun 30, 2017 AForm 4 →	Jul 5, 12:53 pm EDT	Jack B. StrommenDirector	4,264	—	—	14,264	—
Jun 30, 2017 AForm 4 →	Jul 3, 3:02 pm EDT	Kent Charles Roberts IIDirector	34,884	—	—	963,215	—
Jun 30, 2017 AForm 4 →	Jul 3, 3:02 pm EDT	John S. RunyanDirector	43,605	—	—	960,824	—
Jun 30, 2017 AForm 4 →	Jul 3, 2:25 pm EDT	Dennis E MarshallDirector	43,605	—	—	2,020,744	—
Jun 19, 2017 AForm 4 →	Jun 21, 4:33 pm EDT	Dennis E MarshallDirector	10,000	—	—	1,977,139	—
Jun 19, 2017 AForm 4 →	Jun 21, 4:32 pm EDT	Kent Charles Roberts IIDirector	10,000	—	—	928,331	—
Jun 19, 2017 AForm 4 →	Jun 21, 4:32 pm EDT	John S. RunyanDirector	10,000	—	—	917,219	—
Jun 19, 2017 AForm 4 →	Jun 21, 3:01 pm EDT	Jack B. StrommenDirector	10,000	—	—	10,000	—
May 2, 2017 AForm 4/A →	Jun 2, 7:12 pm EDT	Dennis P CalvertPresident, Director	3,731,322	—	—	4,883,296	—
May 2, 2017 AForm 4 →	May 4, 6:04 pm EDT	Dennis P CalvertPresident, Director	3,731,322	—	—	4,883,296	—	amended
Apr 30, 2017 FForm 4 →	May 2, 8:34 pm EDT	Dennis P CalvertPresident, Director	3,866,630	—	—	1,151,974	—
Mar 31, 2017 AForm 4 →	Apr 4, 4:32 pm EDT	Kent Charles Roberts IIDirector	30,000	—	—	918,331	—
Mar 31, 2017 AForm 4 →	Apr 4, 4:32 pm EDT	Gary Adrian CoxDirector	25,000	—	—	1,188,441	—
Mar 31, 2017 AForm 4 →	Apr 4, 4:30 pm EDT	John S. RunyanDirector	37,500	—	—	907,219	—
Mar 31, 2017 AForm 4 →	Apr 4, 4:30 pm EDT	Dennis E MarshallDirector	37,500	—	—	1,967,139	—
Feb 10, 2017 AForm 4 →	Feb 14, 2:38 pm EST	Charles K DarganChief Financial Officer	300,000	—	—	2,746,000	—
Dec 31, 2016 AForm 4 →	Jan 4, 2017, 6:10 pm EST	Kent Charles Roberts IIDirector	18,072	—	—	888,331	—
Dec 31, 2016 AForm 4 →	Jan 4, 2017, 6:04 pm EST	John S. RunyanDirector	22,590	—	—	869,719	—
Dec 31, 2016 AForm 4 →	Jan 4, 2017, 6:00 pm EST	Gary Adrian CoxDirector	9,036	—	—	1,163,441	—
Dec 31, 2016 AForm 4 →	Jan 4, 2017, 5:55 pm EST	Dennis E MarshallDirector	22,590	—	—	1,929,639	—
Sep 30, 2016 AForm 4 →	Oct 4, 4:36 pm EDT	Gary Adrian CoxDirector	13,816	—	—	1,154,405	—
Sep 30, 2016 AForm 4 →	Oct 4, 4:35 pm EDT	John S. RunyanDirector	19,737	—	—	847,129	—
Sep 30, 2016 AForm 4 →	Oct 4, 4:34 pm EDT	Kent Charles Roberts IIDirector	19,737	—	—	870,259	—
Sep 30, 2016 AForm 4 →	Oct 4, 4:31 pm EDT	Dennis E MarshallDirector	29,605	—	—	1,907,049	—
Jun 30, 2016 AForm 4 →	Jul 1, 3:19 pm EDT	Kent Charles Roberts IIDirector	33,333	—	—	850,522	—
Jun 30, 2016 AForm 4 →	Jul 1, 3:19 pm EDT	John S. RunyanDirector	33,333	—	—	827,392	—
Jun 30, 2016 AForm 4 →	Jul 1, 3:14 pm EDT	Gary Adrian CoxDirector	33,333	—	—	1,140,589	—
Jun 30, 2016 AForm 4 →	Jul 1, 3:13 pm EDT	Dennis E MarshallDirector	50,000	—	—	1,877,444	—
Jun 20, 2016 AForm 4 →	Jun 22, 7:33 pm EDT	Dennis E MarshallDirector	10,000	—	—	1,827,444	—
Jun 20, 2016 AForm 4 →	Jun 22, 7:31 pm EDT	Gary Adrian CoxDirector	10,000	—	—	1,107,256	—
Jun 20, 2016 AForm 4 →	Jun 22, 7:30 pm EDT	John S. RunyanDirector	10,000	—	—	794,059	—
Jun 20, 2016 AForm 4 →	Jun 22, 6:38 pm EDT	Kent Charles Roberts IIDirector	10,000	—	—	817,189	—
Mar 31, 2016 AForm 4 →	Apr 4, 4:16 pm EDT	Kent Charles Roberts IIDirector	45,455	—	—	807,189	—
Mar 31, 2016 AForm 4 →	Apr 4, 4:12 pm EDT	Dennis E MarshallDirector	68,182	—	—	1,817,444	—
Mar 31, 2016 AForm 4 →	Apr 4, 11:59 am EDT	John S. RunyanDirector	45,455	—	—	784,059	—
Mar 31, 2016 AForm 4 →	Apr 1, 7:54 pm EDT	Gary Adrian CoxDirector	45,455	—	—	1,097,256	—
Dec 31, 2015 AForm 4 →	Jan 5, 2016, 4:03 pm EST	Gary Adrian CoxDirector	20,000	—	—	1,051,801	—
Dec 31, 2015 AForm 4 →	Jan 5, 2016, 4:03 pm EST	Kent Charles Roberts IIDirector	30,000	—	—	761,734	—
Dec 31, 2015 AForm 4 →	Jan 5, 2016, 4:02 pm EST	John S. RunyanDirector	30,000	—	—	738,604	—
Dec 31, 2015 AForm 4 →	Jan 5, 2016, 3:48 pm EST	Dennis E MarshallDirector	45,000	—	—	1,749,262	—
Sep 30, 2015 AForm 4 →	Oct 2, 4:35 pm EDT	Charles K DarganChief Financial Officer	300,000	—	—	2,446,000	—
Sep 22, 2015 AForm 4 →	Sep 25, 4:12 pm EDT	Gary Adrian CoxDirector	23,077	—	—	1,031,801	—	late
Sep 22, 2015 AForm 4 →	Sep 24, 3:48 pm EDT	Dennis E MarshallDirector	34,615	—	—	1,704,262	—
Sep 22, 2015 AForm 4 →	Sep 24, 3:48 pm EDT	John S. RunyanDirector	23,077	—	—	708,604	—
Sep 22, 2015 AForm 4 →	Sep 24, 3:45 pm EDT	Kent Charles Roberts IIDirector	23,077	—	—	731,734	—
Jun 29, 2015 AForm 4 →	Jul 1, 7:47 pm EDT	Dennis E MarshallDirector	64,286	—	—	1,669,647	—
Jun 29, 2015 AForm 4 →	Jul 1, 7:43 pm EDT	John S. RunyanDirector	42,857	—	—	685,527	—
Jun 29, 2015 AForm 4 →	Jul 1, 7:28 pm EDT	Gary Adrian CoxDirector	42,857	—	—	1,008,724	—
Jun 29, 2015 AForm 4 →	Jul 1, 7:22 pm EDT	Kent Charles Roberts IIDirector	42,857	—	—	708,657	—
Jun 24, 2015 AForm 4 →	Jun 26, 3:51 pm EDT	John S. RunyanDirector	10,000	—	—	642,670	—
Jun 24, 2015 AForm 4 →	Jun 26, 3:51 pm EDT	Dennis E MarshallDirector	10,000	—	—	1,605,361	—
Jun 24, 2015 AForm 4 →	Jun 26, 3:51 pm EDT	Kent Charles Roberts IIDirector	10,000	—	—	665,800	—
Jun 24, 2015 AForm 4 →	Jun 26, 3:22 pm EDT	Gary Adrian CoxDirector	10,000	—	—	965,867	—
Mar 30, 2015 AForm 4 →	Apr 1, 6:23 pm EDT	Dennis E MarshallDirector	63,380	—	—	1,595,361	—
Mar 30, 2015 AForm 4 →	Apr 1, 5:45 pm EDT	Kent Charles Roberts IIDirector	42,254	—	—	655,800	—
Mar 30, 2015 AForm 4 →	Apr 1, 5:41 pm EDT	John S. RunyanDirector	42,254	—	—	632,670	—
Mar 30, 2015 AForm 4 →	Apr 1, 4:56 pm EDT	Gary Adrian CoxDirector	42,254	—	—	955,867	—
Dec 30, 2014 AForm 4 →	Jan 2, 2015, 3:10 pm EST	Dennis E MarshallDirector	64,286	—	—	1,531,981	—