BIOLARGO, INC. (BLGO)
Data as of , from SEC Form 4 filings.
See up to 3 months of BLGO. The 7-day demo opens the 1M and 3M ranges and puts BLGO on your watchlist.
Start 7-day demoLatest BLGO insider trades
About BIOLARGO, INC. (BLGO)
The SEC lists BIOLARGO, INC. under CIK 0000880242, in chemicals and allied products. It is grouped with Materials companies on this site. It filed a registration statement with the SEC on 9 April 2026 and has not yet priced an offering.
BLGO Form 4 activity by transaction type, last 90 days
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Grant or award | 7 | 2,670,020 | |
| Bona-fide gift | 2 | 4,000,000 |
Dollar totals cover purchases and sales only (codes P and S). Grants, option exercises, gifts and tax withholding are counted in shares, because none of them is a trade at a market price.
BLGO insider transactions (Form 4)
936 Form 4 filings on record, the earliest from Oct 1, 2024, newest first. Filing history page 2 of 2.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
 Dennis E. Marshall - Director | Grant or award | Option to Purchase Common Stock | 19,000 | - | - | |
| Dennis E. Marshall - Director | Grant or award | Option to Purchase Common Stock | 112,501 | - | - | |
| Dennis E. Marshall - Director | Grant or award | Option to Purchase Common Stock | 93,750 | - | - | |
| Dennis E. Marshall - Director | Grant or award | Option to Purchase Common Stock | 118,422 | $0.00 | - | |
 Christina Elaine Bray - Director | Grant or award | Option to Purchase Common Stock | 81,522 | - | - | |
 Linda Park - Director | Grant or award | Option to Purchase Common Stock | 81,522 | - | - | |
 Jack B. Strommen - Director | Grant or award | Option to Purchase Common Stock | 65,217 | - | - | |
| Dennis E. Marshall - Director | Grant or award | Option to Purchase Common Stock | 93,749 | - | - | |
| Dennis E. Marshall - Director | Grant or award | Option to Purchase Common Stock | 81,522 | - | - |
BLGO insider trading FAQ
What is the latest insider trade for BLGO?
BIOLARGO, INC. (BLGO) had 6 insider filings in the last 90 days, with the most recent on 2026-10-02. The full record for BLGO runs to 36 Form 4 filings, the earliest from 2024-10-01. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.
How many insiders are buying BLGO stock?
No insider purchases of BLGO were filed in the last 90 days.
How many insiders are selling BLGO stock?
No insider sales of BLGO were filed in the last 90 days.
Where can I see BLGO SEC filings (Form 4, 10-K, 10-Q, 8-K)?
This page collects BLGO Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
More Materials companies with insider activity
Recent insider filings
10The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.
- - Kenneth Reay Code view on EDGAR
- - Dennis P. Calvert view on EDGAR
- - Dennis E. Marshall view on EDGAR
- - Jack B. Strommen view on EDGAR
- - Christina Elaine Bray view on EDGAR
- - Linda Park view on EDGAR
- - Kenneth Reay Code view on EDGAR
- - Dennis P. Calvert view on EDGAR
- - Jack B. Strommen view on EDGAR
Related companies with recent insider activity
Learn more
- What the Form 4 transaction codes mean
- Grants, option exercises, gifts and tax withholding are not trades on the market. The codes say which is which.
- Insider activity in Materials
- Where BLGO's peers are being bought and sold.
- Every recent Form 4
- The market-wide feed, updated as filings arrive from SEC EDGAR.
Follow BLGO with a 7-day demo
- BLGO on your watchlist
- Every BLGO Form 4 filing on record
- Up to 3 months of BLGO price history
- The daily trading plan of ranked insider buys, on a delay, with the plan archive
