Stephen Williamson serves as Executive at THERMO FISHER SCIENTIFIC INC., where they oversee executive responsibilities. Since joining the company, Stephen Williamson has executed 155 insider transactions totaling $82.8M, demonstrating a bearish approach to their equity position. Their most recent transaction on Jan 2, 2026 involved receiving (via award) 306.31 shares valued at $60.0K.
Stephen Williamson currently holds 1,028.51 shares of THERMO FISHER SCIENTIFIC INC. (TMO), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, Stephen Williamson has been a net seller of TMO stock. They have purchased $0 and sold $82.8M worth of shares.
Stephen Williamson's most recent insider trade was on Jan 2, 2026, when they sold 306.31 shares at $195.88 per share.
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| $N/A |
| Discretionary |
| Aug 28, 2025 | TMO | $107.5K | Payment | 219.51 | $489.74 | Discretionary |
| Aug 28, 2025 | TMO | $116.5K | Payment | 237.88 | $489.74 | Discretionary |
| Aug 28, 2025 | TMO | $54.5K | Payment | 111.21 | $489.74 | Discretionary |
| Aug 28, 2025 | TMO | $105.1K | Payment | 214.67 | $489.74 | Discretionary |
| Aug 28, 2024 | TMO | $87.5K | Payment | 142.63 | $613.14 | Discretionary |
| Aug 28, 2024 | TMO | $112.7K | Payment | 183.73 | $613.14 | Discretionary |
| Aug 28, 2024 | TMO | $131.6K | Payment | 214.67 | $613.14 | Discretionary |
| Aug 23, 2024 | TMO | $246.2K | Payment | 406.14 | $606.12 | Discretionary |
| May 28, 2024 | TMO | $0 | Gift | 1,112 | $N/A | Discretionary |
| May 14, 2024 | TMO | $0 | Gift | 12,674 | $N/A | Planned |
| May 14, 2024 | TMO | $0 | Gift | 12,674 | $N/A | Planned |
| May 14, 2024 | TMO | $0 | Gift | 3,297 | $N/A | Planned |
| May 13, 2024 | TMO | $4.6M | Option Exercise | 21,925 | $210.68 | Planned |
| May 13, 2024 | TMO | $13.0M | Sale | 21,925 | $591.27 | Planned |
| Feb 28, 2024 | TMO | $441.2K | Payment | 771.36 | $572.03 | Discretionary |
| Feb 23, 2024 | TMO | $230.6K | Payment | 408.3 | $564.71 | Discretionary |
| Feb 21, 2024 | TMO | $0 | Award | 1,966 | $N/A | Discretionary |
| Aug 28, 2023 | TMO | $60.1K | Payment | 110.24 | $545.19 | Discretionary |
| Aug 28, 2023 | TMO | $97.5K | Payment | 178.9 | $545.19 | Discretionary |
| Aug 25, 2023 | TMO | $332.0K | Payment | 613.08 | $541.59 | Discretionary |
| Aug 23, 2023 | TMO | $221.4K | Payment | 406.14 | $545.24 | Discretionary |
| Aug 1, 2023 | TMO | $7.8M | Sale | 14,100 | $550.00 | Planned |
| Aug 1, 2023 | TMO | $2.7M | Option Exercise | 14,100 | $190.59 | Planned |
| Jul 31, 2023 | TMO | $2.9M | Option Exercise | 15,000 | $190.59 | Planned |
| Jul 31, 2023 | TMO | $8.4M | Sale | 15,000 | $557.42 | Planned |
| Feb 28, 2023 | TMO | $452.4K | Payment | 835 | $541.76 | Discretionary |
| Feb 23, 2023 | TMO | $473.3K | Payment | 859 | $550.95 | Discretionary |
| Feb 23, 2023 | TMO | $435.3K | Payment | 790 | $550.95 | Discretionary |