Thomas Desrosier serves as Executive at GENZYME CORP, where they oversee executive responsibilities. Since joining the company, Thomas Desrosier has executed 49 insider transactions totaling $1.1M, demonstrating a bearish approach to their equity position. Their most recent transaction on Nov 15, 2025 involved selling 76 shares valued at $1.3K.
Thomas Desrosier currently holds 7,623 shares of GENZYME CORP (GENZ), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, Thomas Desrosier has been a net seller of GENZ stock. They have purchased $0 and sold $1.1M worth of shares.
Thomas Desrosier's most recent insider trade was on Nov 15, 2025, when they sold 76 shares at $17.30 per share.
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| $N/A |
| Discretionary |
| Nov 15, 2025 | MCRB | $0 | Option Exercise | 132 | $N/A | Discretionary |
| Aug 18, 2025 | MCRB | $1.3K | Sale | 76 | $16.65 | Discretionary |
| Aug 15, 2025 | MCRB | $0 | Option Exercise | 133 | $N/A | Discretionary |
| Aug 15, 2025 | MCRB | $0 | Option Exercise | 111 | $N/A | Discretionary |
| Aug 16, 2024 | MCRB | $733 | Sale | 873 | $0.84 | Planned |
| Aug 15, 2024 | MCRB | $0 | Option Exercise | 2,656 | $N/A | Planned |
| May 15, 2024 | MCRB | $0 | Option Exercise | 2,656 | $N/A | Planned |
| May 15, 2024 | MCRB | $792 | Sale | 843 | $0.94 | Planned |
| Feb 16, 2024 | MCRB | $4.3K | Sale | 3,939 | $1.08 | Planned |
| Feb 15, 2024 | MCRB | $0 | Option Exercise | 10,625 | $N/A | Planned |
| Oct 30, 2023 | MCRB | $5.6K | Sale | 4,156 | $1.35 | Planned |
| Oct 27, 2023 | MCRB | $0 | Option Exercise | 13,501 | $N/A | Planned |
| Jul 5, 2022 | MCRB | $200.0K | Award | 63,492 | $3.15 | Discretionary |
| Jan 26, 2020 | MCRB | $0 | Option Exercise | 25,000 | $N/A | Discretionary |
| Jan 28, 2019 | MCRB | $31.5K | Sale | 5,471 | $5.75 | Discretionary |
| Jan 26, 2019 | MCRB | $0 | Option Exercise | 15,000 | $N/A | Discretionary |
| Jan 26, 2018 | MCRB | $38.3K | Sale | 3,475 | $11.02 | Discretionary |
| Jan 26, 2018 | MCRB | $0 | Option Exercise | 10,000 | $N/A | Discretionary |
| Feb 18, 2016 | ARIA | $0 | Option Exercise | 55,000 | $N/A | Discretionary |
| Feb 18, 2016 | ARIA | $92.4K | Payment | 18,370 | $5.03 | Discretionary |
| Jan 21, 2015 | CBST | $48.9K | Other | 479 | $102.00 | Discretionary |
| Jan 21, 2015 | CBST | $812.6K | Other | 7,967 | $102.00 | Discretionary |
| Dec 31, 2014 | CBST | $8.9K | Other | 148 | $59.96 | Discretionary |
| Dec 31, 2014 | CBST | $11.8K | Other | 278 | $42.59 | Discretionary |
| Dec 29, 2014 | CBST | $825.1K | Option Exercise | 17,975 | $45.90 | Discretionary |
| Dec 29, 2014 | CBST | $1.2M | Payment | 11,978 | $100.71 | Discretionary |
| Sep 30, 2014 | CBST | $3.2K | Other | 48 | $66.34 | Discretionary |
| Jun 30, 2014 | CBST | $6.2K | Other | 89 | $69.82 | Discretionary |