Figures computed from official regulatory filings — .
Ownershipinsiders 13.73% · institutions 0.04%
In USD · as of Oct 5, 2026
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BioLargo, Inc. invents, develops, and commercializes various platform technologies in the United States. The company's technologies solve challenging environmental problems comprising per- and polyfluoroalkyl substances (PFAS) water contamination; advanced water and wastewater treatment; industrial odor and volatile organic compounds control, air quality control, and infection control; and myriad environmental remediation. It provides full-service environmental engineering, battery energy storage, and advanced antimicrobial medical device platforms. BioLargo, Inc. is based in Westminster, California.
Market information source · Oct 5, 2026
Periods recorded in the consulted sources. These do not certify the legal dates of name changes.
SEC company identity · Oct 5, 2026
Open-market timeline · full history
4 buys4 sells— close pricebar = usd volume, √ scaleclick a period to filter the table
| Insider | Type | Value · USD | Signals | Details |
|---|---|---|---|---|
| CALVERT DENNIS P | Gift | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Marshall Dennis | AwardD (derivative) | n/a (No price was disclosed in the filing) | SEC |
| CODE KENNETH REAY | Gift | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Park Linda | AwardD (derivative) | n/a (No price was disclosed in the filing) | SEC |
| CALVERT DENNIS P | Award | $74.6K | Unusual size | SEC |
| Bray Christina Elaine | AwardD (derivative) | n/a (No price was disclosed in the filing) | SEC |
| CODE KENNETH REAY | Award | $45.3K | SEC |
| Marshall Dennis | AwardD (derivative) | n/a (No price was disclosed in the filing) | SEC |
| STROMMEN JACK B. | AwardD (derivative) | n/a (No price was disclosed in the filing) | SEC |
| CODE KENNETH REAY | Award | $60.4K | Unusual size | SEC |
| Bray Christina Elaine | AwardD (derivative) | n/a (No price was disclosed in the filing) | SEC |
| Park Linda | AwardD (derivative) | n/a (No price was disclosed in the filing) | SEC |
| CALVERT DENNIS P | Award | $79.4K | Unusual size | SEC |
| Marshall Dennis | AwardD (derivative) | n/a (No price was disclosed in the filing) | SEC |
| CALVERT DENNIS P | Award | $24.9K | SEC |
| Marshall Dennis | AwardD (derivative) | n/a (No price was disclosed in the filing) | SEC |
| STROMMEN JACK B. | AwardD (derivative) | n/a (No price was disclosed in the filing) | SEC |
| Marshall Dennis | AwardD (derivative) | n/a (No price was disclosed in the filing) | SEC |
| CODE KENNETH REAY | Award | $11.2K | SEC |
| STROMMEN JACK B. | AwardD (derivative) | n/a (No price was disclosed in the filing) | SEC |
| Marshall Dennis | AwardD (derivative) | n/a (No price was disclosed in the filing) | SEC |
| Bray Christina Elaine | AwardD (derivative) | n/a (No price was disclosed in the filing) | SEC |
| Marshall Dennis | AwardD (derivative) | n/a (No price was disclosed in the filing) | SEC |
| Park Linda | AwardD (derivative) | n/a (No price was disclosed in the filing) | SEC |
| DARGAN CHARLES K | AwardD (derivative) | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |