Zhang Jack Y.
SEC insider (Form 3/4/5 filer). CIK 0001611157. CEO & CHIEF SCIENTIFIC OFFICER at Amphastar Pharmaceuticals, Inc. (AMPH). 28 reported Form 4/5 transactions since Sep 2024; latest on Mar 15, 2026. Located in RANCHO CUCAMONGA, CA.
Companies Zhang Jack Y. has filed insider reports for
- Amphastar Pharmaceuticals, Inc. (AMPH): Director, Officer, 10% Owner, CEO & CHIEF SCIENTIFIC OFFICER
Zhang Jack Y.
CIK: 0001611157
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 (28 total)
- Mar 15, 2026AMPH
Amphastar Pharmaceuticals, Inc.
Tax PaymentDirect9.8K shares at avg. $18.18$178K - Mar 15, 2026AMPH
Amphastar Pharmaceuticals, Inc.
Tax PaymentIndirect2.9K shares at avg. $18.18$53K - Mar 10, 2026AMPH
Amphastar Pharmaceuticals, Inc.
Tax PaymentIndirect4.4K shares at avg. $18.91$83K - Mar 10, 2026AMPH
Amphastar Pharmaceuticals, Inc.
Tax PaymentDirect14.8K shares at avg. $18.91$280K - Mar 9, 2026AMPH
Amphastar Pharmaceuticals, Inc.
AwardDirect180.5K shares- - Mar 9, 2026AMPH
Amphastar Pharmaceuticals, Inc.
AwardIndirect72.5K shares- - Mar 6, 2026AMPH
Amphastar Pharmaceuticals, Inc.
Tax PaymentDirect7.8K shares at avg. $19.34$150K - Mar 6, 2026AMPH
Amphastar Pharmaceuticals, Inc.
Tax PaymentIndirect3.1K shares at avg. $19.34$60K - Mar 4, 2026AMPH
Amphastar Pharmaceuticals, Inc.
Tax PaymentIndirect2.4K shares at avg. $19.96$49K - Mar 4, 2026AMPH
Amphastar Pharmaceuticals, Inc.
Tax PaymentDirect5.8K shares at avg. $19.96$115K
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Mar 15, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Tax Payment | 9,784 | $18.18 | $177,873 | Direct |
| Mar 15, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Tax Payment | 2,908 | $18.18 | $52,867 | Indirect |
| Mar 10, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Tax Payment | 4,395 | $18.91 | $83,109 | Indirect |
| Mar 10, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Tax Payment | 14,785 | $18.91 | $279,584 | Direct |
| Mar 9, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Award | 180,504 | - | $0 | Direct |
| Mar 9, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Award | 72,462 | - | $0 | Indirect |
| Mar 6, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Tax Payment | 7,773 | $19.34 | $150,330 | Direct |
| Mar 6, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Tax Payment | 3,077 | $19.34 | $59,509 | Indirect |
| Mar 4, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Tax Payment | 2,432 | $19.96 | $48,543 | Indirect |
| Mar 4, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Tax Payment | 5,769 | $19.96 | $115,149 | Direct |
1-10 of 28 transactions