As of September 12, 2026, the three largest insider holders of TWST are Emily M. Leproust (Chief Executive Officer, 768.43K shares), William Banyai (See Remark, 345.19K shares), Patrick John Finn (President And Coo, 210.80K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Emily M. Leproust | Chief Executive Officer | 768,427 | 0 | 768,427 | 37.8% | 10 Sep, 2026 |
| 2 | William Banyai | See Remark | 345,188 | 0 | 345,188 | 17.0% | 07 May, 2024 |
| 3 | Patrick John Finn | President And Coo | 210,802 | 0 | 210,802 | 10.4% | 25 Aug, 2026 |
| 4 | Paula Green | Svp Of Human Resources | 117,014 | 0 | 117,014 | 5.8% | 10 Sep, 2026 |
| 5 | Adam Laponis | Chief Financial Officer | 108,633 | 0 | 108,633 | 5.3% | 25 Aug, 2026 |
| 6 | James M Thorburn | Chief Financial Officer | 86,334 | 0 | 86,334 | 4.2% | 04 Jan, 2024 |
| 7 | Dennis Cho | Officer | 73,651 | 0 | 73,651 | 3.6% | 10 Sep, 2026 |
| 8 | Patrick Weiss | Chief Operating Officer | 47,401 | 0 | 47,401 | 2.3% | 01 Apr, 2022 |
| 9 | Robert F. Werner | Chief Accounting Officer | 44,399 | 0 | 44,399 | 2.2% | 10 Sep, 2026 |
| 10 | Nelson Chan | Director | 33,251 | 0 | 33,251 | 1.6% | 09 Feb, 2026 |
| 11 | Xiaoying Mai | Director | 31,057 | 0 | 31,057 | 1.5% | 09 Feb, 2024 |
| 12 | Robert P Ragusa | Director | 28,983 | 0 | 28,983 | 1.4% | 09 Feb, 2026 |
| 13 | Keith Crandell | Director | 27,571 | 0 | 27,571 | 1.4% | 09 Feb, 2026 |
| 14 | Nicolas Barthelemy | Director | 23,021 | 0 | 23,021 | 1.1% | 23 Nov, 2022 |
| 15 | Melissa A. Starovasnik | Director | 22,222 | 0 | 22,222 | 1.1% | 01 Jun, 2026 |
| 16 | Robert Chess | Director | 21,084 | 0 | 21,084 | 1.0% | 11 Aug, 2026 |
| 17 | Jan Johannessen | Director | 17,754 | 0 | 17,754 | 0.9% | 14 May, 2026 |
| 18 | Katryn Blake | Director | 17,208 | 0 | 17,208 | 0.8% | 14 Aug, 2026 |
| 19 | Kevin Bruce Yankton | Chief Accounting Officer | 9,115 | 0 | 9,115 | 0.4% | 19 May, 2023 |
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 |
|---|---|---|---|---|---|---|---|---|
| 08 Sep, 2026 | Paula Green | Svp Of Human Resources | Disposed S | 907 | $122.62 | $111.22K | 117,014 | Direct |
| 08 Sep, 2026 | Emily M. Leproust | Chief Executive Officer | Disposed S | 2,302 | $122.62 | $282.28K | 768,427 | Direct |
| 08 Sep, 2026 | Robert F. Werner | Chief Accounting Officer | Disposed S | 238 | $122.62 | $29.18K | 44,399 | Direct |
| 08 Sep, 2026 | Dennis Cho | Officer | Disposed S | 412 | $122.62 | $50.52K | 73,651 | Direct |
| 25 Aug, 2026 | Emily M. Leproust | Chief Executive Officer | Disposed S | 12,648 | $150.56 | $1.90Mn | 799,651 | Direct |
| 25 Aug, 2026 | Emily M. Leproust | Chief Executive Officer | Disposed S | 12,236 | $151.36 | $1.85Mn | 787,415 | Direct |
| 25 Aug, 2026 | Emily M. Leproust | Chief Executive Officer | Disposed S | 6,412 | $152.75 | $979.43K | 781,003 | Direct |
| 25 Aug, 2026 | Emily M. Leproust | Chief Executive Officer | Disposed S | 9,181 | $153.93 | $1.41Mn | 771,822 | Direct |
| 25 Aug, 2026 | Emily M. Leproust | Chief Executive Officer | Disposed S | 1,093 | $154.45 | $168.81K | 770,729 | Direct |
| 21 Aug, 2026 | Paula Green | Svp Of Human Resources | Disposed S | 1,360 | $139.07 | $189.13K | 117,921 | Direct |
| 21 Aug, 2026 | Patrick John Finn | President And Coo | Disposed S | 4,046 | $139.07 | $562.66K | 210,802 | Direct |
| 21 Aug, 2026 | Robert F. Werner | Chief Accounting Officer | Disposed S | 669 | $139.07 | $93.04K | 45,491 | Direct |
| 21 Aug, 2026 | Emily M. Leproust | Chief Executive Officer | Disposed S | 6,639 | $139.07 | $923.26K | 812,299 | Direct |
| 21 Aug, 2026 | Dennis Cho | Officer | Disposed S | 1,598 | $139.07 | $222.23K | 74,063 | Direct |
| 21 Aug, 2026 | Adam Laponis | Chief Financial Officer | Disposed S | 1,965 | $139.07 | $273.26K | 108,633 | Direct |
| 24 Aug, 2026 | Robert F. Werner | Chief Accounting Officer | Disposed S | 854 | $140.77 | $120.22K | 44,637 | Direct |
| 19 Aug, 2026 | Dennis Cho | Officer | Disposed S | 14,205 | $129.75 | $1.84Mn | 75,661 | Direct |
| 18 Aug, 2026 | Patrick John Finn | President And Coo | Acquired M | 23,355 | $67.85 | $1.58Mn | 293,033 | Direct |
| 18 Aug, 2026 | Patrick John Finn | President And Coo | Disposed S | 33,354 | $115.90 | $3.87Mn | 259,679 | Direct |
| 18 Aug, 2026 | Patrick John Finn | President And Coo | Disposed S | 10,420 | $116.82 | $1.22Mn | 249,259 | Direct |