BLGO
insider transactionsBIOLARGO, INC. — buys & sells by directors, officers and 10% owners A shareholder owning more than 10% of the company. Must report trades, but usually a weaker signal than an officer or director. (SEC Form 4).
No open-market buys or sells this period. The trades below are grants, option exercises and gifts, which carry no market price.
Net buy / sell volume
Not enough data to chart yet.
Tap or hover the chart for daily net volume. Green = net buying, red = net selling.
All transactions
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Grant·A
Director
—
92.6K sh
Own +4%
-
Grant·A
Director
—
115.7K sh
Own +9%
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Grant·A
Director
—
115.7K sh
Own +9%
-
Grant·A
Director
—
115.7K sh
Own +2%
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Grant·A
Director
—
138.9K sh
Own +3%
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Grant·A
Chief Science Officer
$11.2K
69.4K sh · $0.16
Own +0%
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Grant·A
Charles K Dargan KEY
Chief Financial Officer
—
300.0K sh
Own +5%
-
Grant·A
Chief Science Officer
$10.1K
54.8K sh · $0.18
Own +0%
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Grant·A
Dennis P Calvert KEY
President
$24.0K
130.2K sh · $0.18
Own +1%
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Grant·A
Director
—
101.7K sh
Own +9%
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Grant·A
Director
—
101.7K sh
Own +9%
-
Grant·A
Director
—
81.4K sh
Own +4%
-
Grant·A
Director
—
101.7K sh
Own +2%
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Grant·A
Director
—
122.1K sh
Own +2%
| Date▾ | Insider | Type | Shares | Value |
|---|---|---|---|---|
| Mar 31, 2026 | Jack B. Strommen | Grant A | 92.6K | — |
| Mar 31, 2026 | Christina Elaine Bray | Grant A | 115.7K | — |
| Mar 31, 2026 | Linda Park | Grant A | 115.7K | — |
| Mar 31, 2026 | Dennis E Marshall | Grant A | 115.7K | — |
| Mar 31, 2026 | Dennis E Marshall | Grant A | 138.9K | — |
| Mar 31, 2026 | Kenneth Reay Code | Grant A | 69.4K | $11.2K |
| Feb 1, 2026 | Charles K Dargan KEY | Grant A | 300.0K | — |
| Dec 31, 2025 | Kenneth Reay Code | Grant A | 54.8K | $10.1K |
| Dec 31, 2025 | Dennis P Calvert KEY | Grant A | 130.2K | $24.0K |
| Dec 31, 2025 | Linda Park | Grant A | 101.7K | — |
| Dec 31, 2025 | Christina Elaine Bray | Grant A | 101.7K | — |
| Dec 31, 2025 | Jack B. Strommen | Grant A | 81.4K | — |
| Dec 31, 2025 | Dennis E Marshall | Grant A | 101.7K | — |
| Dec 31, 2025 | Dennis E Marshall | Grant A | 122.1K | — |
About BLGO insider trading
This page tracks insider transactions for BIOLARGO, INC. (BLGO) reported to the U.S. Securities and Exchange Commission on Form 4. Corporate insiders — directors, executive officers and beneficial owners of more than 10% of the stock — must disclose their trades within two business days. Open-market purchases (code P) and sales (code S) made at the insider's discretion are the most-watched opportunistic signals, while awards (A), option exercises (M) and tax-withholding (F) reflect compensation rather than conviction. Trades marked 10b5-1 were made under a pre-arranged plan and are considered routine. A cluster buy — several insiders buying within a short window — is historically a stronger bullish indicator than any single trade.