DYAI · Insider Trading
Dyadic International, Inc.
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.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-07-24 | Francisco Trust under agreement dated February 28, 1996 | 10%+ Owner | Sell | −95,392 | −$124.96K |
| 2026-07-06 | Francisco Trust under agreement dated February 28, 1996 | 10%+ Owner | Sell | −172,864 | −$343.76K |
| 2026-01-06 | Ping Wang Rawson | Chief Financial Officer | A | +29,158 | — |
| 2026-01-06 | Joseph P Hazelton | President & COO | A | +36,418 | — |
| 2026-01-06 | Jack Kaye | Director | M | +21,552 | — |
| 2026-01-06 | Mark A Emalfarb | CEO | A | +102,609 | — |
| 2026-01-06 | Ronen Tchelet | VP of Research and Bus. Dvlpmt | A | +18,064 | — |
| 2026-01-06 | Patrick K. Lucy | Director | M | +21,552 | — |
| 2026-01-06 | Seth Herbst | Director | M | +21,552 | — |
| 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 | +26,000 | +$24.70K |
| 2025-06-24 | Michael P. Tarnok | Director | M | +10,776 | — |
| 2025-06-24 | Arindam Bose | Director | M | +10,776 | — |
| 2025-06-06 | Joseph P Hazelton | President and COO | A | +25,000 deriv. | — |
| 2025-03-07 | Jack Kaye | Director | MIXED | +2,483 | +$0 |
| 2025-01-08 | Seth Herbst | Director | M | +25,000 | +$24.25K |
| 2025-01-07 | Joseph P Hazelton | Chief Operating Officer | A | +30,172 | — |
| 2025-01-07 | Mark A Emalfarb | President and CEO | A | +73,111 | — |
| 2025-01-07 | Patrick K. Lucy | Director | M | +23,585 | — |
| 2025-01-07 | Ping Wang Rawson | Chief Financial Officer | A | +20,776 | — |
| 2025-01-07 | Ronen Tchelet | VP of Research and Bus. Dvlpmt | A | +8,980 | — |
| 2025-01-07 | Seth Herbst | Director | M | +23,585 | — |
| 2025-01-07 | Arindam Bose | Director | M | +23,585 | — |
| 2025-01-07 | Jack Kaye | Director | M | +23,585 | — |
| 2025-01-07 | Michael P. Tarnok | Director | M | +23,585 | — |
| 2024-11-25 | Michael P. Tarnok | Director | M | +25,000 | +$24.25K |
| 2024-06-13 | Barry Buckland | Director | M | +11,793 | +$18.75K |
| 2024-05-23 | Michael P. Tarnok | Director | MIXED | +5,569 | +$0 |
| 2024-04-15 | Michael P. Tarnok | Director | D | −13,125 deriv. | — |
| 2024-04-15 | Mark A Emalfarb | President and CEO | A | +124,454 | — |
| 2024-04-15 | Patrick K. Lucy | Director | A | +13,125 deriv. | — |
| 2024-04-15 | Ronen Tchelet | VP of Research and Bus. Dvlpmt | A | +11,169 | — |
| 2024-04-15 | Ping Wang Rawson | Chief Financial Officer | A | +35,366 | — |
| 2024-04-15 | Joseph P Hazelton | Chief Business Officer | A | +41,720 | — |
| 2024-04-15 | Joseph P Hazelton | Chief Business Officer | A | +20,000 deriv. | — |
| 2024-01-04 | Mark A Emalfarb | President and CEO | A | +200,000 deriv. | — |
| 2024-01-04 | Joseph P Hazelton | Chief Business Officer | A | +75,000 deriv. | — |
| 2024-01-04 | Ping Wang Rawson | Chief Financial Officer | A | +75,000 deriv. | — |
| 2024-01-04 | Ronen Tchelet | VP of Research and Bus. Dvlpmt | A | +37,500 deriv. | — |
| 2024-01-04 | Seth Herbst | Director | M | +27,174 | — |
| 2024-01-04 | Michael P. Tarnok | Director | M | +27,174 | — |
| 2024-01-04 | Patrick K. Lucy | Director | M | +27,174 | — |
| 2024-01-04 | Jack Kaye | Director | M | +27,174 | — |
| 2024-01-04 | Arindam Bose | Director | M | +27,174 | — |
| 2024-01-04 | Barry Buckland | Director | M | +27,174 | — |
| 2023-01-05 | Seth Herbst | Director | A | +62,174 deriv. | — |
| 2023-01-05 | Joseph P Hazelton | Chief Business Officer | A | +57,448 | +$79.28K |
| 2023-01-05 | Ronen Tchelet | VP of Research and Bus. Dvlpmt | A | +12,684 | +$17.50K |
| 2023-01-05 | Ping Wang Rawson | Chief Financial Officer | A | +39,351 | +$54.30K |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Mark A Emalfarb | CEO | 9,226,682 | $3.51M |
| Francisco Trust under agreement dated February 28, 1996 | 10%+ Owner | 3,337,648 | $1.27M |
| Michael P. Tarnok | Director | 281,033 | $106.85K |
| Seth Herbst | Director | 202,311 | $76.92K |
| Joseph P Hazelton | President & COO | 191,758 | $72.91K |
| Ping Wang Rawson | Chief Financial Officer | 176,307 | $67.03K |
| Jack Kaye | Director | 81,201 | $30.87K |
| Patrick K. Lucy | Director | 72,311 | $27.49K |
| Arindam Bose | Director | 61,535 | $23.40K |
| Ronen Tchelet | VP of Research and Bus. Dvlpmt | 50,897 | $19.35K |
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.
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.