As of September 29, 2026, the three largest insider holders of DYAI are Mark A Emalfarb (President And Ceo, 12.95Mn shares), Mark A Emalfarb (Ceo, 4.83Mn shares), Trust Under Agreement Dated February 28, 1996 Francisco (TenPercentOwner, 3.28Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Mark A Emalfarb | Ceo | 4,832,667 | 0 | 4,832,667 | 52.2% | 06 Jan, 2026 |
| 2 | Trust Under Agreement Dated February 28, 1996 Francisco | TenPercentOwner | 3,280,272 | 0 | 3,280,272 | 35.4% | 24 Jul, 2026 |
| 3 | Michael P. Tarnok | Director | 281,033 | 0 | 281,033 | 3.0% | 24 Jun, 2025 |
| 4 | Seth Herbst | Director | 202,311 | 0 | 202,311 | 2.2% | 06 Jan, 2026 |
| 5 | Joseph P Hazelton | President Coo | 191,758 | 0 | 191,758 | 2.1% | 06 Jan, 2026 |
| 6 | Ping Wang Rawson | Chief Financial Officer | 170,151 | 0 | 170,151 | 1.8% | 06 Jan, 2026 |
| 7 | Jack Kaye | Director | 81,201 | 0 | 81,201 | 0.9% | 06 Jan, 2026 |
| 8 | Patrick K. Lucy | Director | 72,311 | 0 | 72,311 | 0.8% | 06 Jan, 2026 |
| 9 | Arindam Bose | Director | 61,535 | 0 | 61,535 | 0.7% | 24 Jun, 2025 |
| 10 | Ronen Tchelet | Vp Of Research And Bus. Dvlpmt | 50,897 | 0 | 50,897 | 0.5% | 06 Jan, 2026 |
| 11 | Barry Buckland | Director | 38,967 | 0 | 38,967 | 0.4% | 13 Jun, 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 |
|---|---|---|---|---|---|---|---|---|
| 22 Jul, 2026 | Trust Under Agreement Dated February 28, 1996 Francisco | TenPercentOwner | Disposed S | 38,016 | $1.33 | $50.48K | 3,337,648 | Direct |
| 23 Jul, 2026 | Trust Under Agreement Dated February 28, 1996 Francisco | TenPercentOwner | Disposed S | 54,760 | $1.30 | $71.30K | 3,282,888 | Direct |
| 24 Jul, 2026 | Trust Under Agreement Dated February 28, 1996 Francisco | TenPercentOwner | Disposed S | 2,616 | $1.21 | $3.17K | 3,280,272 | Direct |
| 02 Jan, 2026 | Seth Herbst | Director | Acquired M | 21,552 | — | — | 202,311 | Direct |
| 02 Jan, 2026 | Patrick K. Lucy | Director | Acquired M | 21,552 | — | — | 72,311 | Direct |
| 02 Jan, 2026 | Ronen Tchelet | Vp Of Research And Bus. Dvlpmt | Acquired A | 18,064 | $0.00 | $0 | 50,897 | Direct |
| 02 Jan, 2026 | Jack Kaye | Director | Acquired M | 21,552 | — | — | 81,201 | Direct |
| 02 Jan, 2026 | Ping Wang Rawson | Chief Financial Officer | Acquired A | 29,158 | $0.00 | $0 | 170,151 | Direct |
| 02 Jan, 2026 | Joseph P Hazelton | President Coo | Acquired A | 36,418 | $0.00 | $0 | 191,758 | Direct |
| 02 Jan, 2026 | Mark A Emalfarb | Ceo | Acquired A | 102,609 | $0.00 | $0 | 4,832,667 | Direct |
| 02 Jan, 2026 | Seth Herbst | Director | Disposed M | 21,552 | $0.00 | $0 | 0 | Direct |
| 02 Jan, 2026 | Ping Wang Rawson | Chief Financial Officer | Acquired A | 47,250 | $0.00 | $0 | 47,250 | Direct |
| 02 Jan, 2026 | Ronen Tchelet | Vp Of Research And Bus. Dvlpmt | Acquired A | 47,250 | $0.00 | $0 | 47,250 | Direct |
| 02 Jan, 2026 | Mark A Emalfarb | Ceo | Acquired A | 126,000 | $0.00 | $0 | 126,000 | Direct |
| 02 Jan, 2026 | Patrick K. Lucy | Director | Disposed M | 21,552 | $0.00 | $0 | 0 | Direct |
| 02 Jan, 2026 | Jack Kaye | Director | Disposed M | 21,552 | $0.00 | $0 | 0 | Direct |
| 02 Jan, 2026 | Joseph P Hazelton | President Coo | Acquired A | 67,250 | $0.00 | $0 | 67,250 | Direct |
| 02 Jan, 2026 | Seth Herbst | Director | Acquired A | 50,000 | $0.00 | $0 | 50,000 | Direct |
| 02 Jan, 2026 | Jack Kaye | Director | Acquired A | 67,500 | $0.00 | $0 | 67,500 | Direct |
| 02 Jan, 2026 | Patrick K. Lucy | Director | Acquired A | 67,500 | $0.00 | $0 | 67,500 | Direct |