DYAI (Dyadic International, Inc.)
Insider Trading Activity
Every open-market purchase and sale reported by DYAI officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-07-24 | Francisco Trust under agreement dated February 28, 1996 | 10%+ Owner | Sell | — | — |
| 2026-07-06 | Francisco Trust under agreement dated February 28, 1996 | 10%+ Owner | Sell | — | — |
| 2026-01-06 | Ping Wang Rawson | Chief Financial Officer | A | — | — |
| 2026-01-06 | Joseph P Hazelton | President & COO | A | — | — |
| 2026-01-06 | Jack Kaye | Director | M | — | — |
| 2026-01-06 | MARK A EMALFARB | CEO | A | — | — |
| 2026-01-06 | RONEN TCHELET | VP of Research and Bus. Dvlpmt | A | — | — |
| 2026-01-06 | Patrick K. Lucy | Director | M | — | — |
| 2026-01-06 | SETH HERBST | Director | M | — | — |
| 2025-12-29 | MARK A EMALFARB | CEO | MIXED | — | — |
| 2025-09-17 | MARK A EMALFARB | CEO | Buy | — | — |
| 2025-08-05 | Joseph P Hazelton | President and COO | Buy | — | — |
| 2025-06-24 | Michael P. Tarnok | Director | M | — | — |
| 2025-06-24 | Arindam Bose | Director | M | — | — |
| 2025-06-06 | Joseph P Hazelton | President and COO | A | — | — |
| 2025-03-07 | Jack Kaye | Director | MIXED | — | — |
| 2025-01-08 | SETH HERBST | Director | M | — | — |
| 2025-01-07 | Joseph P Hazelton | Chief Operating Officer | A | — | — |
| 2025-01-07 | MARK A EMALFARB | President and CEO | A | — | — |
| 2025-01-07 | Patrick K. Lucy | Director | M | — | — |
| 2025-01-07 | Ping Wang Rawson | Chief Financial Officer | A | — | — |
| 2025-01-07 | RONEN TCHELET | VP of Research and Bus. Dvlpmt | A | — | — |
| 2025-01-07 | SETH HERBST | Director | M | — | — |
| 2025-01-07 | Arindam Bose | Director | M | — | — |
| 2025-01-07 | Jack Kaye | Director | M | — | — |
| 2025-01-07 | Michael P. Tarnok | Director | M | — | — |
| 2024-11-25 | Michael P. Tarnok | Director | M | — | — |
| 2024-06-13 | Barry Buckland | Director | M | — | — |
| 2024-05-23 | Michael P. Tarnok | Director | MIXED | — | — |
| 2024-04-15 | Michael P. Tarnok | Director | D | — | — |
| 2024-04-15 | MARK A EMALFARB | President and CEO | A | — | — |
| 2024-04-15 | Patrick K. Lucy | Director | A | — | — |
| 2024-04-15 | RONEN TCHELET | VP of Research and Bus. Dvlpmt | A | — | — |
| 2024-04-15 | Ping Wang Rawson | Chief Financial Officer | A | — | — |
| 2024-04-15 | Joseph P Hazelton | Chief Business Officer | A | — | — |
| 2024-04-15 | Joseph P Hazelton | Chief Business Officer | A | — | — |
| 2024-01-04 | MARK A EMALFARB | President and CEO | A | — | — |
| 2024-01-04 | Joseph P Hazelton | Chief Business Officer | A | — | — |
| 2024-01-04 | Ping Wang Rawson | Chief Financial Officer | A | — | — |
| 2024-01-04 | RONEN TCHELET | VP of Research and Bus. Dvlpmt | A | — | — |
| 2024-01-04 | SETH HERBST | Director | M | — | — |
| 2024-01-04 | Michael P. Tarnok | Director | M | — | — |
| 2024-01-04 | Patrick K. Lucy | Director | M | — | — |
| 2024-01-04 | Jack Kaye | Director | M | — | — |
| 2024-01-04 | Arindam Bose | Director | M | — | — |
| 2024-01-04 | Barry Buckland | Director | M | — | — |
| 2023-01-05 | SETH HERBST | Director | A | — | — |
| 2023-01-05 | Joseph P Hazelton | Chief Business Officer | A | — | — |
| 2023-01-05 | RONEN TCHELET | VP of Research and Bus. Dvlpmt | A | — | — |
| 2023-01-05 | Ping Wang Rawson | Chief Financial Officer | A | — | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| — | CEO | 9,226,682 | — |
| — | 10%+ Owner | 3,337,648 | — |
| — | Director | 281,033 | — |
| — | Director | 202,311 | — |
| — | President & COO | 191,758 | — |
| — | Chief Financial Officer | 176,307 | — |
| — | Director | 81,201 | — |
| — | Director | 72,311 | — |
| — | Director | 61,535 | — |
| — | VP of Research and Bus. Dvlpmt | 50,897 | — |
| — | Director | 38,967 | — |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the DYAI quote page; the site-wide leaderboard is on the insider transactions hub.