Comparable stake leader
Kenneth Reay Code
SEC ownership of BIOLARGO, INC.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000880242.
Disclosed value leader
Kenneth Reay Code
Comparable rows
0/11
Latest evidence
31 Mar 2026
- Public ticker
- BLGO on OTC
- Parsed ownership sources
- 3/4/5 and 13F
- Largest SEC-reported holder
- Kenneth Reay Code
- Latest parsed ownership date
- 31 Mar 2026
- Issuer CIK
- 0000880242
- Issuer location
- Westminster, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
1 signal
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of BIOLARGO, INC. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Kenneth Reay Code
Disclosed value leader
Kenneth Reay Code
Comparable rows
0/11
Latest evidence
31 Mar 2026
3/4/5
13F
Highest disclosed value: $4,768,901
11 rows are not safely comparable across share classes.
Showing 1-8 of 11 holder rows.
Quick read
Kenneth Reay Code has the largest disclosed position value at $4.77M.
0 of 11 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Kenneth Reay Code's linked filing trail.
Disclosed position value
Top 3
Kenneth Reay Code
$4.77M
Dennis P. Calvert
$1.94M
FIRST AMERICAN TRUST, FSB
$19.1K
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-8 of 11 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Kenneth Reay Code |
3/4/5
Chief Science Officer, Director
|
—
class O/S missing
|
$4,768,901
25,875,752 shares
|
— | 31 Mar 2026 |
| Dennis P. Calvert |
3/4/5
President, Director
|
—
class O/S missing
|
$1,939,504
10,523,625 shares
|
— | 31 Dec 2025 |
| FIRST AMERICAN TRUST, FSB |
13F
Company
|
—
class O/S missing
|
$19,090
117,838 shares
|
— | 31 Mar 2026 |
| Charles K. Dargan |
3/4/5
Chief Financial Officer
|
—
class O/S missing
|
—
5,931,668 shares
|
— | 01 Feb 2026 |
| Dennis E. Marshall |
3/4/5
Director
|
—
class O/S missing
|
—
5,432,829 shares
|
— | 31 Mar 2026 |
| John S. Runyan |
3/4/5
Director
|
—
class O/S missing
|
—
2,854,951 shares
|
— | 03 Oct 2022 |
| Kent Charles Roberts II |
3/4/5
Director
|
—
class O/S missing
|
—
2,501,001 shares
|
— | 03 Oct 2022 |
| Jack B. Strommen |
3/4/5
Director
|
—
class O/S missing
|
—
2,452,103 shares
|
— | 31 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 06 Jun 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-10 of 10 reporting-owner rows connected to BIOLARGO, INC.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
10
Largest Forms 3/4/5 holder
Kenneth Reay Code
Net 12M change
$0
Latest report
31 Mar 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Kenneth Reay Code | Chief Science Officer, Director | $4,768,901 | Mixed | 31 Mar 2026 | ||
| Dennis P. Calvert | President, Director | $1,939,504 | Mixed | 31 Dec 2025 | ||
| Dennis E. Marshall | Director | Mixed | 31 Mar 2026 | |||
| John S. Runyan | Director | Mixed | 03 Oct 2022 | |||
| Linda Park | Director | Mixed | 31 Mar 2026 | |||
| Christina Elaine Bray | Director | Mixed | 31 Mar 2026 | |||
| Kent Charles Roberts II | Director | Mixed | 03 Oct 2022 | |||
| Charles K. Dargan | Chief Financial Officer | Mixed | 01 Feb 2026 | |||
| Jack B. Strommen | Director | Mixed | 31 Mar 2026 | |||
| Joseph L. Provenzano | Secretary, Director | Mixed | 31 Mar 2022 |
Recent insider transactions for BIOLARGO, INC.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Kenneth Reay Code | BLGO | Common Stock | Award | 0.27% | 69,444 | 25,875,752 | 31 Mar 2026 | Direct | ||
| Jack B. Strommen | BLGO | Option to Purchase Common Stock | Award | 3.92% | 92,593 | 2,452,103 | 31 Mar 2026 | Direct | ||
| Christina Elaine Bray | BLGO | Option to Purchase Common Stock | Award | 9.14% | 115,741 | 1,381,502 | 31 Mar 2026 | Direct | ||
| Linda Park | BLGO | Option to Purchase Common Stock | Award | 9.14% | 115,741 | 1,381,502 | 31 Mar 2026 | Direct | ||
| Dennis E. Marshall | BLGO | Option to Purchase Common Stock | Award | 4.92% | 254,630 | 5,432,829 | 31 Mar 2026 | Direct | ||
| Charles K. Dargan | BLGO | Option to Purchase Common Stock | Award | 5.33% | 300,000 | 5,931,668 | 01 Feb 2026 | Direct | ||
| Kenneth Reay Code | BLGO | Common Stock | Award | 0.21% | 54,803 | 25,806,308 | 31 Dec 2025 | Direct | ||
| Dennis P. Calvert | BLGO | Common Stock | Award | 1.25% | 130,222 | 10,523,625 | 31 Dec 2025 | Direct | ||
| Linda Park | BLGO | Option to Purchase Common Stock | Award | 8.74% | 101,736 | 1,265,761 | 31 Dec 2025 | Direct | ||
| Christina Elaine Bray | BLGO | Option to Purchase Common Stock | Award | 8.74% | 101,736 | 1,265,761 | 31 Dec 2025 | Direct | ||
| Jack B. Strommen | BLGO | Option to Purchase Common Stock | Award | 3.57% | 81,389 | 2,359,510 | 31 Dec 2025 | Direct | ||
| Dennis E. Marshall | BLGO | Option to Purchase Common Stock | Award | 4.46% | 223,820 | 5,246,381 | 31 Dec 2025 | Direct | ||
| Kenneth Reay Code | BLGO | Common Stock | Award | 1.23% | 313,754 | 25,751,505 | 14 Nov 2025 | Direct | ||
| Dennis P. Calvert | BLGO | Common Stock | Award | 3.08% | 310,269 | 10,393,403 | 14 Nov 2025 | Direct | ||
| Charles K. Dargan | BLGO | Option to Purchase Common Stock | Award | 21.8% | 1,005,882 | 5,631,668 | 30 Sep 2025 | Direct | ||
| Charles K. Dargan | BLGO | Option to Purchase Common Stock | Other | -6.09% | -300,000 | 4,625,786 | 30 Sep 2025 | Direct | ||
| Jack B. Strommen | BLGO | Option to Purchase Common Stock | Award | 4.03% | 88,235 | 2,278,121 | 30 Sep 2025 | Direct | ||
| Linda Park | BLGO | Option to Purchase Common Stock | Award | 10.5% | 110,294 | 1,164,025 | 30 Sep 2025 | Direct | ||
| Christina Elaine Bray | BLGO | Option to Purchase Common Stock | Award | 10.5% | 110,294 | 1,164,025 | 30 Sep 2025 | Direct | ||
| Dennis E. Marshall | BLGO | Option to Purchase Common Stock | Award | 5.03% | 242,645 | 5,067,561 | 30 Sep 2025 | Direct | ||
| Dennis P. Calvert | BLGO | Common Stock | Award | 1.72% | 169,498 | 10,029,542 | 14 Jul 2025 | Direct | ||
| Kenneth Reay Code | BLGO | Common Stock | Award | 0.73% | 181,253 | 25,131,495 | 14 Jul 2025 | Direct | ||
| Linda Park | BLGO | Option to Purchase Common Stock | Award | 9.77% | 93,750 | 1,053,731 | 30 Jun 2025 | Direct | ||
| Jack B. Strommen | BLGO | Option to Purchase Common Stock | Award | 3.55% | 75,000 | 2,189,886 | 30 Jun 2025 | Direct | ||
| Christina Elaine Bray | BLGO | Option to Purchase Common Stock | Award | 9.77% | 93,750 | 1,053,731 | 30 Jun 2025 | Direct | ||
| Dennis E. Marshall | BLGO | Option to Purchase Common Stock | Award | 4.86% | 225,251 | 4,859,531 | 30 Jun 2025 | Direct |
* marks a reported price that did not pass the local price check.