Per Business Quant data, Cyanotech insiders hold 2.31Mn shares in total based on their latest Form 4 filings, down 0.39% from 2.32Mn shares at the end of Q2 2026 and down 0.39% from 2.32Mn shares at the end of Q3 2025.
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Michael A / Davis | Director, TenPercentOwner | 0 | 1,528,598 | 1,528,598 | 67.5% | 02 Sep, 2025 |
| 2 | David L Vied | Director | 225,138 | 0 | 225,138 | 9.9% | 02 Sep, 2025 |
| 3 | David M Mulder | Director | 203,468 | 0 | 203,468 | 9.0% | 02 Sep, 2025 |
| 4 | Gerald R Cysewski | Ceo | 146,697 | 0 | 146,697 | 6.5% | 31 Jul, 2025 |
| 5 | Angela May Mcelwee | Director | 53,567 | 0 | 53,567 | 2.4% | 28 Aug, 2023 |
| 6 | Walter Bennett Menzel | Director | 39,455 | 0 | 39,455 | 1.7% | 01 Sep, 2022 |
| 7 | Glenn Jensen | Vp, Operations | 27,110 | 0 | 27,110 | 1.2% | 31 Jul, 2025 |
| 8 | Jennifer M. Johansen | Vp, Quality, Regulatory Govt | 9,743 | 0 | 9,743 | 0.4% | 31 Jul, 2025 |
| 9 | Amy Beth Nordin | Vp, Hr, Secretary | 9,051 | 0 | 9,051 | 0.4% | 31 Jul, 2025 |
| 10 | Matthew Keith Custer | President And Ceo | 6,754 | 0 | 6,754 | 0.3% | 31 Jul, 2025 |
| 11 | Collette Nicole Kakuk | Chief Strategic Comml Officer | 4,707 | 0 | 4,707 | 0.2% | 09 Apr, 2025 |
| 12 | Felicia I Ladin | Cfo, Vp Fin Admin, Treasurer | 4,678 | 0 | 4,678 | 0.2% | 31 Jul, 2024 |
| 13 | Charles Jason Hartmann | Vp, Sales Marketing | 4,422 | 0 | 4,422 | 0.2% | 31 Jul, 2024 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 12 Sep, 2025 | Jennifer A.S. Miyashiro | Cfo, Vp Fin Admin, Treasurer | Acquired A | 50,000 | $0.00 | $0 | 50,000 | Direct |
| 28 Aug, 2025 | David M Mulder | Director | Acquired A | 50,000 | $0.00 | $0 | 203,468 | Direct |
| 28 Aug, 2025 | David L Vied | Director | Acquired A | 50,000 | $0.00 | $0 | 225,138 | Direct |
| 28 Aug, 2025 | Michael A / Davis | Director, TenPercentOwner | Acquired A | 50,000 | $0.00 | $0 | 1,528,598 | Indirect |
| 29 Jul, 2025 | Matthew Keith Custer | President And Ceo | Acquired M | 2,075 | $0.00 | $0 | 6,754 | Direct |
| 29 Jul, 2025 | Gerald R Cysewski | Other | Acquired M | 1,577 | $0.00 | $0 | 147,289 | Direct |
| 29 Jul, 2025 | Jennifer M. Johansen | Vp, Quality, Regulatory Govt | Acquired M | 1,380 | $0.00 | $0 | 10,261 | Direct |
| 29 Jul, 2025 | Glenn Jensen | Vp, Operations | Acquired M | 1,642 | $0.00 | $0 | 27,727 | Direct |
| 29 Jul, 2025 | Amy Beth Nordin | Vp, Hr, Secretary | Acquired M | 1,502 | $0.00 | $0 | 9,576 | Direct |
| 29 Jul, 2025 | Gerald R Cysewski | Other | Disposed F | 592 | $0.41 | $240 | 146,697 | Direct |
| 29 Jul, 2025 | Matthew Keith Custer | President And Ceo | Disposed M | 2,075 | $0.00 | $0 | 64,137 | Direct |
| 29 Jul, 2025 | Jennifer M. Johansen | Vp, Quality, Regulatory Govt | Disposed F | 518 | $0.41 | $210 | 9,743 | Direct |
| 29 Jul, 2025 | Amy Beth Nordin | Vp, Hr, Secretary | Disposed F | 525 | $0.41 | $213 | 9,051 | Direct |
| 29 Jul, 2025 | Amy Beth Nordin | Vp, Hr, Secretary | Disposed M | 1,502 | $0.00 | $0 | 34 | Direct |
| 29 Jul, 2025 | Glenn Jensen | Vp, Operations | Disposed F | 617 | $0.41 | $250 | 27,110 | Direct |
| 29 Jul, 2025 | Jennifer M. Johansen | Vp, Quality, Regulatory Govt | Disposed M | 1,380 | $0.00 | $0 | 34 | Direct |
| 29 Jul, 2025 | Glenn Jensen | Vp, Operations | Disposed M | 1,642 | $0.00 | $0 | 34 | Direct |
| 29 Jul, 2025 | Gerald R Cysewski | Other | Disposed M | 1,577 | $0.00 | $0 | 34 | Direct |
| 16 Jun, 2025 | Matthew Keith Custer | President And Ceo | Acquired A | 150,000 | $0.00 | $0 | 150,000 | Direct |
| 16 Jun, 2025 | Matthew Keith Custer | President And Ceo | Acquired A | 64,103 | $0.00 | $0 | 4,679 | Direct |