As of June 06, 2026, the three largest insider holders of TWST are Emily M. Leproust (Chief Executive Officer, 858.89K shares), Keith Crandell (Director, 559.99K shares), William Banyai (See Remark, 345.19K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Keith Crandell | - | 0 | 559,989 | 13 Aug, 2021 |
| Robert P Ragusa | - | 28,983 | 0 | 09 Feb, 2026 |
| Jan Johannessen | - | 17,754 | 0 | 09 Feb, 2026 |
| Robert Chess | - | 21,084 | 0 | 19 Mar, 2026 |
| Nelson Chan | - | 33,251 | 0 | 09 Feb, 2026 |
| James M Thorburn | Chief Financial Officer | 86,334 | 0 | 04 Jan, 2024 |
| Nicolas Barthelemy | - | 23,021 | 0 | 23 Nov, 2022 |
| Katryn Blake | - | 19,448 | 0 | 09 Feb, 2026 |
| Robert F. Werner | Chief Accounting Officer | 54,799 | 0 | 10 Mar, 2026 |
| Kevin Bruce Yankton | Chief Accounting Officer | 9,115 | 0 | 19 May, 2023 |
| Emily M. Leproust | Chief Executive Officer | 858,887 | 0 | 24 Mar, 2026 |
| William Banyai | See Remark | 345,188 | 0 | 07 May, 2024 |
| Paula Green | Svp Of Human Resources | 124,104 | 0 | 24 Mar, 2026 |
| Xiaoying Mai | - | 31,057 | 0 | 09 Feb, 2024 |
| Patrick Weiss | Chief Operating Officer | 47,401 | 0 | 01 Apr, 2022 |
| Patrick John Finn | President And Coo | 284,129 | 0 | 25 Feb, 2026 |
| Adam Laponis | Chief Financial Officer | 118,694 | 0 | 21 Apr, 2026 |
| Melissa A. Starovasnik | - | 25,722 | 0 | 03 Apr, 2026 |
| Dennis Cho | - | 137,903 | 0 | 24 Mar, 2026 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 17 Apr, 2026 | Adam Laponis | Common Stock | D | 4,000 | $60.00 | 118,694 | D | S |
| 09 Apr, 2026 | Adam Laponis | Common Stock | D | 2,597 | $49.89 | 125,694 | D | S |
| 01 Apr, 2026 | Melissa A. Starovasnik | Common Stock | D | 1,000 | $51.00 | 25,722 | D | S |
| 20 Mar, 2026 | Emily M. Leproust | Common Stock | D | 1,742 | $43.79 | 858,887 | D | S |
| 20 Mar, 2026 | Paula Green | Common Stock | D | 297 | $43.79 | 124,104 | D | S |
| 20 Mar, 2026 | Dennis Cho | Common Stock | D | 354 | $43.79 | 137,903 | D | S |
| 17 Mar, 2026 | Robert Chess | Common Stock | A | 10,000 | $11.89 | 31,084 | D | M |
| 17 Mar, 2026 | Robert Chess | Common Stock | D | 10,000 | $47.00 | 21,084 | D | S |
| 17 Mar, 2026 | Robert Chess | Stock Option (right to buy) | D | 10,000 | $0.00 | 18,417 | D | M |
| 06 Mar, 2026 | Robert F. Werner | Common Stock | D | 246 | $46.43 | 54,799 | D | S |
| 06 Mar, 2026 | Robert F. Werner | Common Stock | D | 246 | $46.43 | 54,799 | D | S |
| 06 Mar, 2026 | Robert F. Werner | Common Stock | D | 246 | $46.43 | 54,799 | D | S |
| 06 Mar, 2026 | Robert F. Werner | Common Stock | D | 246 | $46.43 | 54,799 | D | S |
| 06 Mar, 2026 | Emily M. Leproust | Common Stock | D | 2,423 | $46.43 | 860,629 | D | S |
| 06 Mar, 2026 | Paula Green | Common Stock | D | 935 | $46.43 | 124,401 | D | S |
| 06 Mar, 2026 | Robert F. Werner | Common Stock | D | 246 | $46.43 | 54,799 | D | S |
| 06 Mar, 2026 | Robert F. Werner | Common Stock | D | 246 | $46.43 | 54,799 | D | S |
| 06 Mar, 2026 | Dennis Cho | Common Stock | D | 425 | $46.43 | 138,257 | D | S |
| 23 Feb, 2026 | Robert F. Werner | Common Stock | D | 1,693 | $46.71 | 55,045 | D | S |
| 23 Feb, 2026 | Robert F. Werner | Common Stock | D | 1,693 | $46.71 | 55,045 | D | S |