Briggs Morrison serves as Executive at Syndax Pharmaceuticals Inc, where they oversee executive responsibilities. Since joining the company, Briggs Morrison has executed 72 insider transactions totaling $29.6M, demonstrating a bearish approach to their equity position. Their most recent transaction on Sep 22, 2025 involved purchasing 30,000 shares valued at $227.1K.
Briggs Morrison currently holds 76,021 shares of Syndax Pharmaceuticals Inc (SNDX), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, Briggs Morrison has been a net seller of SNDX stock. They have purchased $830.2K and sold $28.8M worth of shares.
Briggs Morrison's most recent insider trade was on Sep 22, 2025, when they purchased 30,000 shares at $7.57 per share.
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| $N/A |
| Discretionary |
| Feb 7, 2024 | SNDX | $0 | Award | 17,000 | $N/A | Discretionary |
| Aug 9, 2023 | SNDX | $463.5K | Option Exercise | 52,855 | $8.77 | Planned |
| Aug 9, 2023 | SNDX | $965.7K | Sale | 52,855 | $18.27 | Planned |
| Jul 10, 2023 | SNDX | $463.5K | Option Exercise | 52,855 | $8.77 | Planned |
| Jul 10, 2023 | SNDX | $1.1M | Sale | 52,855 | $20.40 | Planned |
| Jun 15, 2023 | ARVN | $0 | Award | 4,121 | $N/A | Discretionary |
| Jun 9, 2023 | SNDX | $248.0K | Option Exercise | 28,273 | $8.77 | Planned |
| Jun 9, 2023 | SNDX | $156.8K | Option Exercise | 24,582 | $6.38 | Planned |
| Jun 9, 2023 | SNDX | $520.6K | Sale | 24,582 | $21.18 | Planned |
| Jun 9, 2023 | SNDX | $598.8K | Sale | 28,273 | $21.18 | Planned |
| May 9, 2023 | SNDX | $1.1M | Sale | 52,855 | $21.41 | Planned |
| May 9, 2023 | SNDX | $337.2K | Option Exercise | 52,855 | $6.38 | Planned |
| Apr 10, 2023 | SNDX | $1.0M | Sale | 52,855 | $19.53 | Planned |
| Apr 10, 2023 | SNDX | $337.2K | Option Exercise | 52,855 | $6.38 | Planned |
| Mar 13, 2023 | SNDX | $337.2K | Option Exercise | 52,854 | $6.38 | Discretionary |
| Mar 13, 2023 | SNDX | $1.2M | Sale | 52,854 | $22.53 | Discretionary |
| Mar 7, 2023 | CARM | $0 | Award | 12,175 | $N/A | Discretionary |
| Feb 6, 2023 | SNDX | $1.4M | Sale | 52,854 | $26.83 | Discretionary |
| Feb 6, 2023 | SNDX | $337.2K | Option Exercise | 52,854 | $6.38 | Discretionary |
| Sep 20, 2022 | SNDX | $1.4M | Sale | 59,649 | $23.25 | Discretionary |
| Sep 20, 2022 | SNDX | $650.2K | Option Exercise | 59,649 | $10.90 | Discretionary |
| Sep 19, 2022 | SNDX | $1.2M | Option Exercise | 114,339 | $10.90 | Discretionary |
| Sep 19, 2022 | SNDX | $2.6M | Sale | 114,339 | $23.03 | Discretionary |
| Sep 16, 2022 | SNDX | $518.2K | Option Exercise | 71,966 | $7.20 | Discretionary |
| Sep 16, 2022 | SNDX | $1.7M | Sale | 71,966 | $23.22 | Discretionary |
| Sep 16, 2022 | SNDX | $1.2M | Sale | 53,034 | $23.22 | Discretionary |
| Sep 16, 2022 | SNDX | $578.1K | Option Exercise | 53,034 | $10.90 | Discretionary |
| Sep 15, 2022 | SNDX | $480.8K | Option Exercise | 66,775 | $7.20 | Discretionary |