Rong Zhou
CIK: 0001645326
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 (23 total)
- Sep 16, 2026AMPH
Amphastar Pharmaceuticals, Inc.
Exercise(M)Direct10K shares at avg. $13.35$134K - Sep 16, 2026AMPH
Amphastar Pharmaceuticals, Inc.
Sale(S)Direct10K shares at avg. $23.94$239K - Sep 2, 2026AMPH
Amphastar Pharmaceuticals, Inc.
Sale(S)Direct3.2K shares at avg. $23.63$75K - Mar 15, 2026AMPH
Amphastar Pharmaceuticals, Inc.
Tax Payment(F)Direct1.2K shares at avg. $18.18$22K - Mar 10, 2026AMPH
Amphastar Pharmaceuticals, Inc.
Tax Payment(F)Direct2.2K shares at avg. $18.91$42K - Mar 9, 2026AMPH
Amphastar Pharmaceuticals, Inc.
Award(A)Direct39.4K shares- - Mar 6, 2026AMPH
Amphastar Pharmaceuticals, Inc.
Tax Payment(F)Direct1.4K shares at avg. $19.34$26K - Mar 4, 2026AMPH
Amphastar Pharmaceuticals, Inc.
Tax Payment(F)Direct1.1K shares at avg. $19.96$22K - Dec 17, 2025AMPH
Amphastar Pharmaceuticals, Inc.
Sale(S)Direct9.8K shares at avg. $26.20$256K - Dec 17, 2025AMPH
Amphastar Pharmaceuticals, Inc.
Exercise(M)Direct9.8K shares at avg. $11.33$111K - Mar 17, 2025AMPH
Amphastar Pharmaceuticals, Inc.
Tax Payment(F)Direct2K shares at avg. $27.69$54K - Mar 15, 2025AMPH
Amphastar Pharmaceuticals, Inc.
Tax Payment(F)Direct1.2K shares at avg. $26.66$33K - Mar 10, 2025AMPH
Amphastar Pharmaceuticals, Inc.
Award(A)Direct24.7K shares- - Mar 6, 2025AMPH
Amphastar Pharmaceuticals, Inc.
Tax Payment(F)Direct1.4K shares at avg. $28.32$38K - Mar 4, 2025AMPH
Amphastar Pharmaceuticals, Inc.
Tax Payment(F)Direct1.1K shares at avg. $27.62$31K - Dec 13, 2024AMPH
Amphastar Pharmaceuticals, Inc.
Exercise(M)Direct8K shares at avg. $11.33$91K - Dec 13, 2024AMPH
Amphastar Pharmaceuticals, Inc.
Sale(S)Direct8K shares at avg. $45.23$362K - Dec 12, 2024AMPH
Amphastar Pharmaceuticals, Inc.
Exercise(M)Direct7K shares at avg. $11.33$79K - Dec 12, 2024AMPH
Amphastar Pharmaceuticals, Inc.
Sale(S)Direct7K shares at avg. $44.42$311K - Nov 12, 2024AMPH
Amphastar Pharmaceuticals, Inc.
Exercise(M)Direct6.9K shares at avg. $14.95$103K - Nov 12, 2024AMPH
Amphastar Pharmaceuticals, Inc.
Sale(S)Direct6.9K shares at avg. $48.88$337K - Sep 13, 2024AMPH
Amphastar Pharmaceuticals, Inc.
Sale(S)Direct3K shares at avg. $48.26$145K - Sep 13, 2024AMPH
Amphastar Pharmaceuticals, Inc.
Exercise(M)Direct3K shares at avg. $14.95$45K
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Sep 16, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Exercise(M) | 10,000 | $13.35 | $133,500 | Direct |
| Sep 16, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Sale(S) | 10,000 | $23.94 | $239,404 | Direct |
| Sep 2, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Sale(S) | 3,187 | $23.63 | $75,306 | Direct |
| Mar 15, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Tax Payment(F) | 1,225 | $18.18 | $22,271 | Direct |
| Mar 10, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Tax Payment(F) | 2,215 | $18.91 | $41,886 | Direct |
| Mar 9, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Award(A) | 39,432 | - | $0 | Direct |
| Mar 6, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Tax Payment(F) | 1,357 | $19.34 | $26,244 | Direct |
| Mar 4, 2026 | AMPH Amphastar Pharmaceuticals, Inc. | Tax Payment(F) | 1,124 | $19.96 | $22,435 | Direct |
| Dec 17, 2025 | AMPH Amphastar Pharmaceuticals, Inc. | Sale(S) | 9,787 | $26.20 | $256,379 | Direct |
| Dec 17, 2025 | AMPH Amphastar Pharmaceuticals, Inc. | Exercise(M) | 9,787 | $11.33 | $110,887 | Direct |
| Mar 17, 2025 | AMPH Amphastar Pharmaceuticals, Inc. | Tax Payment(F) | 1,967 | $27.69 | $54,466 | Direct |
| Mar 15, 2025 | AMPH Amphastar Pharmaceuticals, Inc. | Tax Payment(F) | 1,222 | $26.66 | $32,579 | Direct |
| Mar 10, 2025 | AMPH Amphastar Pharmaceuticals, Inc. | Award(A) | 24,692 | - | - | Direct |
| Mar 6, 2025 | AMPH Amphastar Pharmaceuticals, Inc. | Tax Payment(F) | 1,354 | $28.32 | $38,345 | Direct |
| Mar 4, 2025 | AMPH Amphastar Pharmaceuticals, Inc. | Tax Payment(F) | 1,121 | $27.62 | $30,962 | Direct |
| Dec 13, 2024 | AMPH Amphastar Pharmaceuticals, Inc. | Exercise(M) | 8,000 | $11.33 | $90,640 | Direct |
| Dec 13, 2024 | AMPH Amphastar Pharmaceuticals, Inc. | Sale(S) | 8,000 | $45.23 | $361,840 | Direct |
| Dec 12, 2024 | AMPH Amphastar Pharmaceuticals, Inc. | Exercise(M) | 7,000 | $11.33 | $79,310 | Direct |
| Dec 12, 2024 | AMPH Amphastar Pharmaceuticals, Inc. | Sale(S) | 7,000 | $44.42 | $310,975 | Direct |
| Nov 12, 2024 | AMPH Amphastar Pharmaceuticals, Inc. | Exercise(M) | 6,893 | $14.95 | $103,050 | Direct |
| Nov 12, 2024 | AMPH Amphastar Pharmaceuticals, Inc. | Sale(S) | 6,893 | $48.88 | $336,930 | Direct |
| Sep 13, 2024 | AMPH Amphastar Pharmaceuticals, Inc. | Sale(S) | 3,000 | $48.26 | $144,785 | Direct |
| Sep 13, 2024 | AMPH Amphastar Pharmaceuticals, Inc. | Exercise(M) | 3,000 | $14.95 | $44,850 | Direct |
1-23 of 23 transactions
About Zhou Rong
Zhou Rong (SEC CIK 0001645326) files insider reports with the SEC as SENIOR EVP, PRODUCTION CENTER of Amphastar Pharmaceuticals, Inc. (AMPH).
Signal8 holds 14 ownership filings by Zhou Rong, all Form 4s, filed between Sep 17, 2024 and Sep 17, 2026. Those filings report 23 transactions, from Sep 13, 2024 to Sep 16, 2026. Signal8's Form 4 history starts in Sep 2024.
The business address on Zhou Rong's filings is in RANCHO CUCAMONGA, CA.
Recent filings by Zhou Rong
- Sep 16, 2026: Option exercise of AMPH shares (Form 4, code M).
- Sep 16, 2026: Open-market sale of AMPH shares (Form 4, code S).
- Sep 2, 2026: Open-market sale of AMPH shares (Form 4, code S).
- Mar 15, 2026: Tax withholding of AMPH shares (Form 4, code F).
- Mar 10, 2026: Tax withholding of AMPH shares (Form 4, code F).
Other insiders filing for Amphastar Pharmaceuticals, Inc. (AMPH)
- PETERS WILLIAM J, CFO, EVP & TREASURER
- PRINS RICHARD K, Director
- Pierce Anthony T, Director
- Lee Howard, Director
- ZASLOFF MICHAEL A, Director
- Gerst Diane G., Director