Yarrow Bioscience's three largest insider shareholders as of September 29, 2026 are Fund Group Gp, Llc Rtw (TenPercentOwner, 266.31K shares), David Domzalski (President And Ceo, 6.94K shares), Iain Stuart (Chief Scientific Officer, 1.92K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Fund Group Gp, Llc Rtw | TenPercentOwner | 0 | 266,307 | 266,307 | 95.2% | 30 Jul, 2026 |
| 2 | David Domzalski | President And Ceo | 6,943 | 0 | 6,943 | 2.5% | 24 Jul, 2026 |
| 3 | Iain Stuart | Chief Scientific Officer | 1,919 | 0 | 1,919 | 0.7% | 24 Jul, 2026 |
| 4 | Mutya Harsch | Chief Legal Officer And Gc | 1,918 | 0 | 1,918 | 0.7% | 24 Jul, 2026 |
| 5 | Tyler Zeronda | Chief Financial Officer | 1,498 | 0 | 1,498 | 0.5% | 24 Jul, 2026 |
| 6 | Patrick G Lepore | Director | 1,029 | 0 | 1,029 | 0.4% | 16 Jan, 2025 |
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 |
|---|---|---|---|---|---|---|---|---|
| 29 Jul, 2026 | Fund Group Gp, Llc Rtw | TenPercentOwner | Disposed J | 133,290 | $0.00 | $0 | 266,307 | Indirect |
| 29 Jul, 2026 | Fund Group Gp, Llc Rtw | TenPercentOwner | Acquired J | 133,290 | $0.00 | $0 | 8,949,719 | Indirect |
| 27 Jul, 2026 | Tyler Zeronda | Director | Acquired A | 185,798 | $0.00 | $0 | 3,716 | Direct |
| 27 Jul, 2026 | Mona Ashiya | Director | Acquired A | 15,435 | $0.00 | $0 | 309 | Direct |
| 23 Jul, 2026 | David Domzalski | President And Ceo | Disposed F | 79,391 | $44.88 | $3.56Mn | 6,943 | Direct |
| 23 Jul, 2026 | Iain Stuart | Chief Scientific Officer | Disposed F | 15,405 | $44.88 | $691.38K | 1,919 | Direct |
| 23 Jul, 2026 | Mutya Harsch | Chief Legal Officer And Gc | Disposed F | 22,516 | $44.88 | $1.01Mn | 1,918 | Direct |
| 23 Jul, 2026 | Tyler Zeronda | Chief Financial Officer | Disposed F | 22,516 | $44.88 | $1.01Mn | 1,498 | Direct |
| 30 Jun, 2026 | Tyler Zeronda | Chief Financial Officer | Disposed F | 3,464 | $32.54 | $112.70K | 1,949 | Direct |
| 30 Jun, 2026 | Mutya Harsch | Chief Legal Officer And Gc | Disposed F | 3,464 | $32.54 | $112.70K | 2,369 | Direct |
| 30 Jun, 2026 | David Domzalski | President And Ceo | Disposed F | 12,214 | $32.54 | $397.38K | 8,531 | Direct |
| 30 Jun, 2026 | Iain Stuart | Chief Scientific Officer | Disposed F | 2,370 | $32.54 | $77.11K | 2,227 | Direct |
| 29 May, 2026 | David Domzalski | President And Ceo | Acquired A | 30,791 | $15.50 | $477.26K | 8,776 | Direct |
| 31 Mar, 2026 | Iain Stuart | Chief Scientific Officer | Disposed F | 2,876 | $29.88 | $85.92K | 2,247 | Direct |
| 31 Mar, 2026 | David Domzalski | President And Ceo | Disposed F | 14,232 | $29.88 | $425.18K | 8,040 | Direct |
| 31 Mar, 2026 | Tyler Zeronda | Chief Financial Officer | Disposed F | 4,007 | $29.88 | $119.71K | 1,996 | Direct |
| 31 Mar, 2026 | Mutya Harsch | Chief Legal Officer And Gc | Disposed F | 4,007 | $29.88 | $119.71K | 2,438 | Direct |
| 31 Dec, 2025 | David Domzalski | President And Ceo | Disposed F | 12,684 | $29.01 | $367.90K | 8,324 | Direct |
| 31 Dec, 2025 | Iain Stuart | Chief Scientific Officer | Disposed F | 2,448 | $29.01 | $71.00K | 2,305 | Direct |
| 31 Dec, 2025 | Tyler Zeronda | Chief Financial Officer | Disposed F | 7,858 | $29.01 | $227.92K | 2,076 | Direct |