Arbuckle Stuart A
SEC insider (Form 3/4/5 filer). CIK 0001557290. Director at RHYTHM PHARMACEUTICALS, INC. (RYTM) and 3 other issuers. 20 reported Form 4/5 transactions since Sep 2024; latest on Jun 24, 2026. Located in BOSTON, MA.
Companies Arbuckle Stuart A has filed insider reports for
- RHYTHM PHARMACEUTICALS, INC. (RYTM): Director
- Praxis Precision Medicines, Inc. (PRAX): Director
- ALNYLAM PHARMACEUTICALS, INC. (ALNY): Director
- VERTEX PHARMACEUTICALS INC / MA (VRTX): Officer, EVP, COO
Arbuckle Stuart A
CIK: 0001557290
Transaction Breakdown
High conviction signal
Position reduction
Derivative conversions
Compensation grants
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Discretionary Trading P&L
Holdings
Transaction History (20 total)
- Jun 24, 2026RYTM
RHYTHM PHARMACEUTICALS, INC.
AwardDirectRestricted Stock Units
2.3K shares- - Jun 24, 2026RYTM
RHYTHM PHARMACEUTICALS, INC.
AwardDirectStock Option (right to buy)
3.7K shares- - Jun 23, 2026RYTM
RHYTHM PHARMACEUTICALS, INC.
ExerciseDirect4.7K shares- - Jun 10, 2026PRAX
Praxis Precision Medicines, Inc.
AwardDirect1.4K shares- - May 20, 2026ALNY
ALNYLAM PHARMACEUTICALS, INC.
AwardDirect671 shares- - Feb 6, 2026PRAX
Praxis Precision Medicines, Inc.
AwardDirect478 shares- - Feb 6, 2026PRAX
Praxis Precision Medicines, Inc.
AwardDirect688 shares- - Jan 5, 2026ALNY
ALNYLAM PHARMACEUTICALS, INC.
AwardDirectStock Option (right to buy)
3.3K shares- - Jul 1, 2025VRTX
VERTEX PHARMACEUTICALS INC / MA
Tax PaymentDirect37.2K shares at avg. $450.23$16.8M - Jun 24, 2025RYTM
RHYTHM PHARMACEUTICALS, INC.
AwardDirectStock Option (right to buy)
7K shares-
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Jun 24, 2026 |  RYTM RHYTHM PHARMACEUTICALS, INC. | Award Restricted Stock Units | 2,324 | - | - | Direct |
| Jun 24, 2026 | RYTM RHYTHM PHARMACEUTICALS, INC. | Award Stock Option (right to buy) | 3,691 | - | - | Direct |
| Jun 23, 2026 | RYTM RHYTHM PHARMACEUTICALS, INC. | Exercise | 4,712 | - | $0 | Direct |
| Jun 10, 2026 |  PRAX Praxis Precision Medicines, Inc. | Award | 1,371 | - | $0 | Direct |
| May 20, 2026 |  ALNY ALNYLAM PHARMACEUTICALS, INC. | Award | 671 | - | $0 | Direct |
| Feb 6, 2026 | PRAX Praxis Precision Medicines, Inc. | Award | 478 | - | $0 | Direct |
| Feb 6, 2026 | PRAX Praxis Precision Medicines, Inc. | Award | 688 | - | $0 | Direct |
| Jan 5, 2026 | ALNY ALNYLAM PHARMACEUTICALS, INC. | Award Stock Option (right to buy) | 3,279 | - | - | Direct |
| Jul 1, 2025 |  VRTX VERTEX PHARMACEUTICALS INC / MA | Tax Payment | 37,243 | $450.23 | $16,767,916 | Direct |
| Jun 24, 2025 | RYTM RHYTHM PHARMACEUTICALS, INC. | Award Stock Option (right to buy) | 7,037 | - | - | Direct |
1-10 of 20 transactions