Time on boards
- Boards served
- 3
- Current seats
- 3
- Board service
- 5 years
- Director since
- 2023
5 years of board service in total across 3 boards, counting each seat separately. Longest: Rhythm Pharmaceuticals Inc., 3 years.
Shareholder support
Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
-
Alnylam Pharmaceuticals Inc. May 20, 202695.8%
-
Rhythm Pharmaceuticals Inc. September 18, 202487.5%
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
| Date | Company | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Jun 23, 2026 | Rhythm Pharmaceuticals Inc. | Option exercise | +4,712 | — | — |
| Jun 10, 2026 | Praxis Precision Medicines Inc. | Grant or award | +1,371 | — | — |
| May 20, 2026 | Alnylam Pharmaceuticals Inc. | Grant or award | +671 | — | — |
| Feb 6, 2026 | Praxis Precision Medicines Inc. | Grant or award | +688 | — | — |
| Feb 6, 2026 | Praxis Precision Medicines Inc. | Grant or award | +478 | — | — |
| Jul 1, 2025 | Vertex Pharmaceuticals Incorporated | Shares withheld for tax | −37,243 | $450.23 | $16,767,916 |
| Jun 18, 2025 | Rhythm Pharmaceuticals Inc. | Option exercise | +4,000 | — | — |
| May 13, 2025 | Vertex Pharmaceuticals Incorporated | Grant or award | +37,622 | — | — |
| Feb 26, 2025 | Vertex Pharmaceuticals Incorporated | Shares withheld for tax | −7,071 | $479.61 | $3,391,322 |
| Feb 24, 2025 | Vertex Pharmaceuticals Incorporated | Shares withheld for tax | −4,716 | $483.28 | $2,279,148 |
| Feb 14, 2025 | Vertex Pharmaceuticals Incorporated | Shares withheld for tax | −2,724 | $463.46 | $1,262,465 |
| Feb 12, 2025 | Vertex Pharmaceuticals Incorporated | Grant or award | +7,903 | — | — |
| Feb 10, 2025 | Vertex Pharmaceuticals Incorporated | Shares withheld for tax | −3,220 | $467.98 | $1,506,896 |
| Feb 4, 2025 | Vertex Pharmaceuticals Incorporated | Grant or award | +14,624 | — | — |
| Feb 4, 2025 | Vertex Pharmaceuticals Incorporated | Grant or award | +8,448 | — | — |
Questions about Stuart A. Arbuckle
What boards is Stuart A. Arbuckle on?
Stuart A. Arbuckle sits on the boards of Alnylam Pharmaceuticals Inc., Praxis Precision Medicines Inc. and Rhythm Pharmaceuticals Inc.
How long has Stuart A. Arbuckle served on boards?
Our records show at least 5 years of board service across 3 boards, the earliest from 2023.
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