PETERS WILLIAM J
SEC insider (Form 3/4/5 filer). CIK 0001263136. CFO, EVP & TREASURER at Amphastar Pharmaceuticals, Inc. (AMPH). 18 reported Form 4/5 transactions since Sep 2024; latest on Sep 21, 2026. Located in RANCHO CUCAMONGA, CA.
Companies PETERS WILLIAM J has filed insider reports for
- Amphastar Pharmaceuticals, Inc. (AMPH): Director, Officer, CFO, EVP & TREASURER
PETERS WILLIAM J
CIK: 0001263136
Transaction Breakdown
High conviction signal
Position reduction
Derivative conversions
Compensation grants
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Companies & Roles (1)
Amphastar Pharmaceuticals, Inc.
Discretionary Trading P&L
Holdings
Transaction History (18 total)
- Sep 21, 2026AMPH
Amphastar Pharmaceuticals, Inc.
SaleDirect4.1K shares at avg. $25.00$103K - Aug 7, 2026AMPH
Amphastar Pharmaceuticals, Inc.
SaleDirect8.2K shares at avg. $22.48$184K - Aug 7, 2026AMPH
Amphastar Pharmaceuticals, Inc.
ExerciseDirect5.1K shares at avg. $19.79$100K - Mar 15, 2026AMPH
Amphastar Pharmaceuticals, Inc.
Tax PaymentDirect2K shares at avg. $18.18$36K - Mar 10, 2026AMPH
Amphastar Pharmaceuticals, Inc.
Tax PaymentDirect3.3K shares at avg. $18.91$62K - Mar 9, 2026AMPH
Amphastar Pharmaceuticals, Inc.
AwardDirect58.7K shares- - Mar 6, 2026AMPH
Amphastar Pharmaceuticals, Inc.
Tax PaymentDirect2.1K shares at avg. $19.34$42K - Mar 4, 2026AMPH
Amphastar Pharmaceuticals, Inc.
Tax PaymentDirect1.7K shares at avg. $19.96$35K - May 19, 2025AMPH
Amphastar Pharmaceuticals, Inc.
Tax PaymentDirect273 shares at avg. $24.79$7K - Mar 17, 2025AMPH
Amphastar Pharmaceuticals, Inc.
Tax PaymentDirect3K shares at avg. $27.69$83K
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Sep 21, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Sale | 4,139 | $25.00 | $103,475 | Direct |
| Aug 7, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Sale | 8,180 | $22.48 | $183,886 | Direct |
| Aug 7, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Exercise | 5,053 | $19.79 | $99,999 | Direct |
| Mar 15, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Tax Payment | 1,973 | $18.18 | $35,869 | Direct |
| Mar 10, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Tax Payment | 3,297 | $18.91 | $62,346 | Direct |
| Mar 9, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Award | 58,693 | - | $0 | Direct |
| Mar 6, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Tax Payment | 2,146 | $19.34 | $41,504 | Direct |
| Mar 4, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Tax Payment | 1,744 | $19.96 | $34,810 | Direct |
| May 19, 2025 | AMPH Amphastar Pharmaceuticals, Inc. | Tax Payment | 273 | $24.79 | $6,768 | Direct |
| Mar 17, 2025 | AMPH Amphastar Pharmaceuticals, Inc. | Tax Payment | 3,004 | $27.69 | $83,181 | Direct |
1-10 of 18 transactions