Comparable stake leader
Michael A. Davis
SEC ownership of CYANOTECH CORP
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000768408.
Disclosed value leader
Michael A. Davis
Comparable rows
0/17
Latest evidence
12 Sep 2025
- Public ticker
- CYAN on OTC
- Parsed ownership sources
- 3/4/5
- Largest SEC-reported holder
- Michael A. Davis
- Latest parsed ownership date
- 12 Sep 2025
- Issuer CIK
- 0000768408
- Issuer location
- Kailua Kona, HI
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 CYANOTECH CORP (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
Michael A. Davis
Disclosed value leader
Michael A. Davis
Comparable rows
0/17
Latest evidence
12 Sep 2025
3/4/5
Highest disclosed value: $1,359,454
17 rows are not safely comparable across share classes.
Showing 1-8 of 17 holder rows.
Quick read
Michael A. Davis has the largest disclosed position value at $1.36M.
0 of 17 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 Michael A. Davis's linked filing trail.
Disclosed position value
Top 5
Michael A. Davis
$1.36M
David L. Vied
$148.9K
David M. Mulder
$130.4K
Gerald R. Cysewski
$60K
Nancy E. Katz
$55.4K
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-8 of 17 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Michael A. Davis |
3/4/5
Director, 10%+ Owner
|
—
class O/S missing
|
$1,359,454
1,838,756 shares
|
— | 28 Aug 2025 |
| David L. Vied |
3/4/5
Director
|
—
class O/S missing
|
$148,867
225,138 shares
|
— | 28 Aug 2025 |
| David M. Mulder |
3/4/5
Director
|
—
class O/S missing
|
$130,448
203,468 shares
|
— | 28 Aug 2025 |
| Gerald R. Cysewski |
3/4/5
Chief Scientific Officer
|
—
mixed-class rows
|
$59,989
146,981 shares
mixed-class rows
|
— | 29 Jul 2025 |
| Nancy E. Katz |
3/4/5
Director
|
—
class O/S missing
|
$55,395
55,395 shares
|
— | 18 Oct 2021 |
| Angela May McElwee |
3/4/5
Director
|
—
class O/S missing
|
$53,567
53,567 shares
|
— | 25 Aug 2023 |
| Walter Bennett Menzel |
3/4/5
Director
|
—
class O/S missing
|
$39,455
39,455 shares
|
— | 30 Aug 2022 |
| Glenn Jensen |
3/4/5
VP, Operations
|
—
mixed-class rows
|
$16,834
69,354 shares
mixed-class rows
|
— | 29 Jul 2025 |
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 1-17 of 17 reporting-owner rows connected to CYANOTECH CORP. Open a relationship link for the CIK-to-CIK filing trail.
Rows
17
Largest Forms 3/4/5 holder
Michael A. Davis
Net 12M change
$0
Latest report
12 Sep 2025
Recent insider transactions for CYANOTECH CORP
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Jennifer A.s. Miyashiro | CYAN | Cyanotech Common Stock Options | Award | 50,000 | 50,000 | 12 Sep 2025 | Direct | |||
| David M. Mulder | CYAN | Cyanotech Corporation Common Stock | Award | 32.6% | 50,000 | 203,468 | 28 Aug 2025 | Direct | ||
| David L. Vied | CYAN | Cyanotech Corporation Common Stock | Award | 28.6% | 50,000 | 225,138 | 28 Aug 2025 | Direct | ||
| Michael A. Davis | CYAN | Cyanotech Corporation Common Stock | Award | 3.38% | 50,000 | 1,528,598 | 28 Aug 2025 | By self as trustee of the Michael Arlen Davis Revocable Trust | ||
| Matthew Keith Custer | CYAN | Common Stock | Options Exercise | 44.4% | 2,075 | 6,754 | 29 Jul 2025 | Direct | ||
| Matthew Keith Custer | CYAN | Restricted Stock Units | Options Exercise | -3.13% | -2,075 | 64,137 | 29 Jul 2025 | Direct | ||
| Amy Beth Nordin | CYAN | Common Stock | Tax liability | -5.48% | -525 | 9,051 | 29 Jul 2025 | Direct | ||
| Amy Beth Nordin | CYAN | Common Stock | Options Exercise | 18.6% | 1,502 | 9,576 | 29 Jul 2025 | Direct | ||
| Amy Beth Nordin | CYAN | Restricted Stock Units | Options Exercise | -97.8% | -1,502 | 34 | 29 Jul 2025 | Direct | ||
| Jennifer M. Johansen | CYAN | Common Stock | Tax liability | -5.05% | -518 | 9,743 | 29 Jul 2025 | Direct | ||
| Jennifer M. Johansen | CYAN | Common Stock | Options Exercise | 15.5% | 1,380 | 10,261 | 29 Jul 2025 | Direct | ||
| Jennifer M. Johansen | CYAN | Restricted Stock Units | Options Exercise | -97.6% | -1,380 | 34 | 29 Jul 2025 | Direct | ||
| Gerald R. Cysewski | CYAN | Common Stock | Tax liability | -0.4% | -592 | 146,697 | 29 Jul 2025 | Direct | ||
| Gerald R. Cysewski | CYAN | Common Stock | Options Exercise | 1.08% | 1,577 | 147,289 | 29 Jul 2025 | Direct | ||
| Gerald R. Cysewski | CYAN | Restricted Stock Units | Options Exercise | -97.9% | -1,577 | 34 | 29 Jul 2025 | Direct | ||
| Glenn Jensen | CYAN | Common Stock | Tax liability | -2.23% | -617 | 27,110 | 29 Jul 2025 | Direct | ||
| Glenn Jensen | CYAN | Common Stock | Options Exercise | 6.29% | 1,642 | 27,727 | 29 Jul 2025 | Direct | ||
| Glenn Jensen | CYAN | Restricted Stock Units | Options Exercise | -98% | -1,642 | 34 | 29 Jul 2025 | Direct | ||
| Matthew Keith Custer | CYAN | Restricted Stock Units | Award | 64,103 | 4,679 | 16 Jun 2025 | Direct | |||
| Matthew Keith Custer | CYAN | Cyanotech common stock options | Award | 150,000 | 150,000 | 16 Jun 2025 | Direct |
* marks a reported price that did not pass the local price check.