In the last 12 months, insiders at BIOLARGO, INC. ($BLGO) filed 61 transactions with the SEC: 0 open-market purchases totaling $0 and 0 sales totaling $0. Net insider sentiment: neutral.
BIOLARGO, INC. operates in the Chemicals & allied products industry (Industrial Applications and Services sector).
Most Active Insiders
- CODE KENNETH REAY (Chief Science Officer) — 6 transactions totaling $130,958
- CALVERT DENNIS P (President) — 4 transactions totaling $116,036
- DARGAN CHARLES K (Chief Financial Officer) — 6 transactions totaling $1
- Marshall Dennis E (Director) — 19 transactions totaling $0
- Bray Christina Elaine (Director) — 9 transactions totaling $0
View all SEC Filings for BIOLARGO, INC. (BLGO).
Set Up your own filters →Recent Insider Transactions
| Transaction Date | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|
| March 31, 2026 | CODE KENNETH REAY | Chief Science Officer | A | Common Stock | 69444 | $0.16 | 25,875,752.0000 | 313,762,657 | 0.27% | 0.02% |
| March 31, 2026 | STROMMEN JACK B. | Director | A | Option to Purchase Common Stock | 92593 | $0.00 | 2,452,103.0000 | 313,762,657 | 3.92% | 0.03% |
| March 31, 2026 | Bray Christina Elaine | Director | A | Option to Purchase Common Stock | 115741 | $0.00 | 1,381,502.0000 | 313,762,657 | 9.14% | 0.04% |
| March 31, 2026 | Park Linda | Director | A | Option to Purchase Common Stock | 115741 | $0.00 | 1,381,502.0000 | 313,762,657 | 9.14% | 0.04% |
| March 31, 2026 | Marshall Dennis E | Director | A | Option to Purchase Common Stock | 138889 | $0.00 | 5,317,088.0000 | 313,762,657 | 2.68% | 0.04% |
| March 31, 2026 | Marshall Dennis E | Director | A | Option to Purchase Common Stock | 115741 | $0.00 | 5,432,829.0000 | 313,762,657 | 2.18% | 0.04% |
| Feb. 1, 2025 | DARGAN CHARLES K | Chief Financial Officer | A | Option to Purchase Common Stock | 300000 | $0.00 | 10,557,454.0000 | 0 | 2.92% | 0.00% |
| Sept. 30, 2025 | DARGAN CHARLES K | Chief Financial Officer | A | Option to Purchase Common Stock | 1005882 | $0.00 | 11,263,336.0000 | 301,303,131 | 9.81% | 0.33% |
| Sept. 30, 2025 | DARGAN CHARLES K | Chief Financial Officer | J | Option to Purchase Common Stock | 300000 | $0.57 | 10,257,454.0000 | 301,303,131 | 2.84% | 0.10% |
| Feb. 1, 2026 | DARGAN CHARLES K | Chief Financial Officer | A | Option to Purchase Common Stock | 300000 | $0.00 | 5,931,668.0000 | 313,762,657 | 5.33% | 0.10% |
| Dec. 31, 2025 | Bray Christina Elaine | Director | A | Option to Purchase Common Stock | 101736 | $0.00 | 1,265,761.0000 | 313,762,657 | 8.74% | 0.03% |
| Dec. 31, 2025 | Park Linda | Director | A | Option to Purchase Common Stock | 101736 | $0.00 | 1,265,761.0000 | 313,762,657 | 8.74% | 0.03% |
| Dec. 31, 2025 | CALVERT DENNIS P | President | A | Common Stock | 130222 | $0.18 | 10,523,625.0000 | 313,762,657 | 1.25% | 0.04% |
| Dec. 31, 2025 | CODE KENNETH REAY | Chief Science Officer | A | Common Stock | 54803 | $0.18 | 25,806,308.0000 | 313,762,657 | 0.21% | 0.02% |
| Dec. 31, 2025 | Marshall Dennis E | Director | A | Option to Purchase Common Stock | 101736 | $0.00 | 5,246,381.0000 | 313,762,657 | 1.98% | 0.03% |
| Dec. 31, 2025 | Marshall Dennis E | Director | A | Option to Purchase Common Stock | 122084 | $0.00 | 5,144,645.0000 | 313,762,657 | 2.43% | 0.04% |
| Dec. 31, 2025 | STROMMEN JACK B. | Director | A | Option to Purchase Common Stock | 81389 | $0.00 | 2,359,510.0000 | 313,762,657 | 3.57% | 0.03% |
| Nov. 14, 2025 | CODE KENNETH REAY | Chief Science Officer | A | Common Stock | 313754 | $0.16 | 25,751,505.0000 | 313,762,657 | 1.23% | 0.10% |
| Nov. 14, 2025 | CALVERT DENNIS P | President | A | Common Stock | 310269 | $0.16 | 10,393,403.0000 | 313,762,657 | 3.08% | 0.10% |
| Sept. 30, 2025 | Bray Christina Elaine | Director | A | Option to Purchase Common Stock | 110294 | $0.00 | 1,164,025.0000 | 301,303,131 | 10.47% | 0.04% |
| Sept. 30, 2025 | STROMMEN JACK B. | Director | A | Option to Purchase Common Stock | 88235 | $0.00 | 2,278,121.0000 | 301,303,131 | 4.03% | 0.03% |
| Sept. 30, 2025 | Park Linda | Director | A | Option to Purchase Common Stock | 110294 | $0.00 | 1,164,025.0000 | 301,303,131 | 10.47% | 0.04% |
| Sept. 30, 2025 | Marshall Dennis E | Director | A | Option to Purchase Common Stock | 132351 | $0.00 | 4,957,267.0000 | 301,303,131 | 2.74% | 0.04% |
| Sept. 30, 2025 | Marshall Dennis E | Director | A | Option to Purchase Common Stock | 110294 | $0.00 | 5,067,561.0000 | 301,303,131 | 2.22% | 0.04% |
| July 14, 2025 | CODE KENNETH REAY | Chief Science Officer | A | Common Stock | 181253 | $0.20 | 25,131,495.0000 | 301,303,131 | 0.73% | 0.06% |
| July 14, 2025 | CALVERT DENNIS P | President | A | Common Stock | 169498 | $0.20 | 10,029,542.0000 | 301,303,131 | 1.72% | 0.06% |
| June 30, 2025 | Marshall Dennis E | Director | A | Option to Purchase Common Stock | 93750 | $0.00 | 4,859,531.0000 | 301,303,131 | 1.97% | 0.03% |
| June 30, 2025 | Park Linda | Director | A | Option to Purchase Common Stock | 93750 | $0.00 | 1,053,731.0000 | 301,303,131 | 9.77% | 0.03% |
| June 30, 2025 | STROMMEN JACK B. | Director | A | Option to Purchase Common Stock | 75000 | $0.00 | 2,189,886.0000 | 301,303,131 | 3.55% | 0.02% |
| June 30, 2025 | Bray Christina Elaine | Director | A | Option to Purchase Common Stock | 93750 | $0.00 | 1,053,731.0000 | 301,303,131 | 9.77% | 0.03% |
| June 30, 2025 | Marshall Dennis E | Director | A | Option to Purchase Common Stock | 19000 | $0.00 | 4,717,566.0000 | 301,303,131 | 0.40% | 0.01% |
| June 30, 2025 | Marshall Dennis E | Director | A | Option to Purchase Common Stock | 112501 | $0.00 | 4,765,781.0000 | 301,303,131 | 2.42% | 0.04% |
| Dec. 31, 2024 | Park Linda | Director | A | Option to Purchase Common Stock | 98684 | $0.00 | 893,017.0000 | 0 | 12.42% | 0.00% |
| Dec. 31, 2024 | STROMMEN JACK B. | Director | A | Option to Purchase Common Stock | 78947 | $0.00 | 2,061,395.0000 | 0 | 3.98% | 0.00% |
| Dec. 31, 2024 | CODE KENNETH REAY | Chief Science Officer | A | Common stock | 57666 | $0.19 | 25,120,245.0000 | 0 | 0.23% | 0.00% |
| Dec. 31, 2024 | Marshall Dennis E | Director | A | Option to Purchase Common Stock | 98684 | $0.00 | 4,624,625.0000 | 0 | 2.18% | 0.00% |
| Dec. 31, 2024 | Bray Christina Elaine | Director | A | Option to Purchase Common Stock | 98684 | $0.00 | 893,017.0000 | 0 | 12.42% | 0.00% |
| Dec. 26, 2024 | Marshall Dennis E | Director | A | Option to Purchase Common Stock | 118422 | $0.00 | 4,525,941.0000 | 0 | 2.69% | 0.00% |
| Sept. 30, 2024 | STROMMEN JACK B. | Director | A | Option to Purchase Common Stock | 65217 | $0.00 | 1,982,368.0000 | 0 | 3.40% | 0.00% |
| Sept. 30, 2024 | Park Linda | Director | A | Option to Purchase Common Stock | 81522 | $0.00 | 794,333.0000 | 0 | 11.44% | 0.00% |
| Sept. 30, 2024 | Bray Christina Elaine | Director | A | Option to Purchase Common Stock | 81522 | $0.00 | 794,333.0000 | 0 | 11.44% | 0.00% |
| Sept. 29, 2024 | Marshall Dennis E | Director | A | Option to Purchase Common Stock | 93749 | $0.00 | 4,390,283.0000 | 0 | 2.18% | 0.00% |
| Sept. 30, 2024 | Marshall Dennis E | Director | A | Option to Purchase Common Stock | 81522 | $0.00 | 4,471,805.0000 | 0 | 1.86% | 0.00% |
| Aug. 13, 2024 | DARGAN CHARLES K | Chief Financial Officer | A | Option | 300000 | $0.00 | 4,625,786.0000 | 0 | 6.94% | 0.00% |
| June 30, 2024 | Park Linda | Director | A | Option to Purchase Common Stock | 73529 | $0.00 | 712,811.0000 | 0 | 11.50% | 0.00% |
| June 30, 2024 | Marshall Dennis E | Director | A | Option to Purchase Common Stock | 73529 | $0.00 | 4,344,406.0000 | 0 | 1.72% | 0.00% |
| June 28, 2024 | Marshall Dennis E | Director | A | Option to Purchase Common Stock | 88237 | $0.00 | 4,270,877.0000 | 0 | 2.11% | 0.00% |
| June 30, 2024 | Bray Christina Elaine | Director | A | Option to Purchase Common Stock | 73529 | $0.00 | 712,811.0000 | 0 | 11.50% | 0.00% |
| June 30, 2024 | STROMMEN JACK B. | Director | A | Option to Purchase Common Stock | 58824 | $0.00 | 1,917,151.0000 | 0 | 3.17% | 0.00% |
| June 23, 2024 | DARGAN CHARLES K | Chief Financial Officer | A | Option to purchase common stock | 700000 | $0.00 | 4,325,786.0000 | 0 | 19.31% | 0.00% |
| March 31, 2024 | Marshall Dennis E | Director | A | Option to Purchase Common Stock | 53571 | $0.00 | 4,217,256.0000 | 0 | 1.29% | 0.00% |
| March 31, 2024 | STROMMEN JACK B. | Director | A | Option to Purchase Common Stock | 42857 | $0.00 | 1,858,327.0000 | 0 | 2.36% | 0.00% |
| March 31, 2024 | Park Linda | Director | A | Option to Purchase Common Stock | 53571 | $0.00 | 639,282.0000 | 0 | 9.15% | 0.00% |
| March 31, 2024 | Bray Christina Elaine | Director | A | Option to Purchase Common Stock | 53571 | $0.00 | 639,282.0000 | 0 | 9.15% | 0.00% |
| March 28, 2024 | Marshall Dennis E | Director | A | Option to Purchase Common Stock | 64176 | $0.00 | 4,163,685.0000 | 0 | 1.57% | 0.00% |
| Dec. 31, 2023 | Park Linda | Director | A | Option to Purchase Common Stock | 111607 | $0.00 | 585,711.0000 | 0 | 23.54% | 0.00% |
| Dec. 31, 2023 | CODE KENNETH REAY | Chief Science Officer | A | Common stock | 72621 | $0.17 | 25,062,579.0000 | 0 | 0.29% | 0.00% |
| Dec. 31, 2023 | Marshall Dennis E | Director | A | Option to Purchase Common Stock | 133929 | $0.00 | 4,152,045.0000 | 0 | 3.33% | 0.00% |
| Dec. 31, 2023 | Marshall Dennis E | Director | A | Option to Purchase Common Stock | 111607 | $0.00 | 4,108,116.0000 | 0 | 2.79% | 0.00% |
| Dec. 31, 2023 | Bray Christina Elaine | Director | A | Option to Purchase Common Stock | 111607 | $0.00 | 585,711.0000 | 0 | 23.54% | 0.00% |
| Dec. 31, 2023 | CALVERT DENNIS P | President | A | Common stock | 50557 | $0.17 | 9,860,044.0000 | 0 | 0.52% | 0.00% |