TWST's three largest insider shareholders as of August 27, 2026 are Emily M. Leproust (Chief Executive Officer, 858.89K shares), Keith Crandell (Director, 559.99K shares), William Banyai (See Remark, 345.19K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Emily M. Leproust | Chief Executive Officer | 812,299 | 0 | 812,299 | 39.0% | 25 Aug, 2026 |
| 2 | William Banyai | See Remark | 345,188 | 0 | 345,188 | 16.6% | 07 May, 2024 |
| 3 | Patrick John Finn | President And Coo | 210,802 | 0 | 210,802 | 10.1% | 25 Aug, 2026 |
| 4 | Paula Green | Svp Of Human Resources | 117,921 | 0 | 117,921 | 5.7% | 25 Aug, 2026 |
| 5 | Adam Laponis | Chief Financial Officer | 112,675 | 0 | 112,675 | 5.4% | 02 Jun, 2026 |
| 6 | James M Thorburn | Chief Financial Officer | 86,334 | 0 | 86,334 | 4.1% | 04 Jan, 2024 |
| 7 | Dennis Cho | Officer | 74,063 | 0 | 74,063 | 3.6% | 25 Aug, 2026 |
| 8 | Patrick Weiss | Chief Operating Officer | 47,401 | 0 | 47,401 | 2.3% | 01 Apr, 2022 |
| 9 | Robert F. Werner | Chief Accounting Officer | 44,637 | 0 | 44,637 | 2.1% | 25 Aug, 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 | 1.3% | 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 |
|---|---|---|---|---|---|---|---|---|
| 21 Aug, 2026 | Emily M. Leproust | Chief Executive Officer | Disposed S | 6,639 | $139.07 | $923.26K | 812,299 | Direct |
| 21 Aug, 2026 | Paula Green | Svp Of Human Resources | Disposed S | 1,360 | $139.07 | $189.13K | 117,921 | Direct |
| 21 Aug, 2026 | Robert F. Werner | Chief Accounting Officer | Disposed S | 669 | $139.07 | $93.04K | 45,491 | Direct |
| 21 Aug, 2026 | Patrick John Finn | President And Coo | Disposed S | 4,046 | $139.07 | $562.66K | 210,802 | Direct |
| 21 Aug, 2026 | Dennis Cho | Officer | Disposed S | 1,598 | $139.07 | $222.23K | 74,063 | 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 |
| 18 Aug, 2026 | Patrick John Finn | President And Coo | Disposed S | 8,868 | $117.70 | $1.04Mn | 240,391 | Direct |
| 18 Aug, 2026 | Patrick John Finn | President And Coo | Disposed S | 4,500 | $119.04 | $535.68K | 235,891 | Direct |
| 18 Aug, 2026 | Patrick John Finn | President And Coo | Disposed S | 12,917 | $119.86 | $1.55Mn | 222,974 | Direct |
| 18 Aug, 2026 | Patrick John Finn | President And Coo | Disposed S | 6,296 | $121.01 | $761.86K | 216,678 | Direct |
| 18 Aug, 2026 | Patrick John Finn | President And Coo | Disposed S | 2,000 | $122.58 | $245.16K | 214,678 | Direct |
| 18 Aug, 2026 | Patrick John Finn | President And Coo | Disposed M | 23,355 | $0.00 | $0 | 0 | Direct |
| 12 Aug, 2026 | Katryn Blake | Director | Disposed S | 2,240 | $122.88 | $275.25K | 17,208 | Direct |
| 12 Aug, 2026 | Emily M. Leproust | Chief Executive Officer | Acquired M | 19,952 | $26.66 | $531.92K | 838,890 | Direct |
| 12 Aug, 2026 | Emily M. Leproust | Chief Executive Officer | Disposed S | 19,952 | $125.08 | $2.50Mn | 818,938 | Direct |
| 12 Aug, 2026 | Emily M. Leproust | Chief Executive Officer | Disposed M | 19,952 | $0.00 | $0 | 133,269 | Direct |