Zhou Rong — SEC Form 4 filings
SEC reporting owner CIK 1645326. 18 Form 4 filings on record with FilingPulse; latest filed 2026-09-17.
Transaction summary — filings shown
Covers all 18 filings on record, filed 2024-03-06 to 2026-09-17. Counts and totals are arithmetic on values as filed — descriptive data, not a recommendation.
- Open-market purchases (code P, non-derivative): none reported.
- Open-market sales (code S, non-derivative): 8 legs across 7 filings — 51,867 shares, $1,919,019 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 32.
- Largest priced transaction: sale of 8,000 shares @ $45.23 ($361,840) in Amphastar Pharmaceuticals, Inc., filed 2024-12-16.
By issuer — same filings
Open-market purchase/sale legs on non-derivative securities, grouped by issuer. Role is as filed on the newest filing for that issuer. Dollar totals cover priced legs only (shares × price as filed). Ordered by priced transaction value, largest first.
| Issuer | Role (as filed) | Filings | Purchases (P) | Sales (S) | Other legs |
|---|---|---|---|---|---|
| Amphastar Pharmaceuticals, Inc. (AMPH) | SENIOR EVP, PRODUCTION CENTER | 18 | — | 8 legs · 51,867 sh · $1,919,019 | 32 |
Form 4 filings — Zhou Rong
| Filed | Form | Issuer | Reported transactions | Source |
|---|---|---|---|---|
| 2026-09-17 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) | Option exercise (M): 10,000 @ $13.35 · Sale (S): 10,000 @ $23.94 · Option exercise (M): 10,000 (derivative) @ $0 | EDGAR |
| 2026-09-03 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) | Sale (S): 3,187 @ $23.63 | EDGAR |
| 2026-03-17 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) | Tax withholding (F): 1,225 @ $18.18 | EDGAR |
| 2026-03-11 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) | Grant/award (A): 39,432 @ $0 · Tax withholding (F): 2,215 @ $18.91 · Grant/award (A): 81,341 (derivative) @ $0 | EDGAR |
| 2026-03-10 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) | Tax withholding (F): 1,357 @ $19.34 | EDGAR |
| 2026-03-06 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) | Tax withholding (F): 1,124 @ $19.96 | EDGAR |
| 2025-12-18 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) | Option exercise (M): 9,787 @ $11.33 · Sale (S): 9,787 @ $26.20 · Option exercise (M): 9,787 (derivative) @ $0 | EDGAR |
| 2025-03-18 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) | Tax withholding (F): 1,222 @ $26.66 · Tax withholding (F): 1,967 @ $27.69 | EDGAR |
| 2025-03-12 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) | Grant/award (A): 24,692 @ $0 · Grant/award (A): 52,437 (derivative) @ $0 | EDGAR |
| 2025-03-10 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) | Tax withholding (F): 1,354 @ $28.32 | EDGAR |
| 2025-03-06 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) | Tax withholding (F): 1,121 @ $27.62 | EDGAR |
| 2024-12-16 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) | Option exercise (M): 7,000 @ $11.33 · Sale (S): 7,000 @ $44.42 · Option exercise (M): 8,000 @ $11.33 · Sale (S): 8,000 @ $45.23 · Option exercise (M): 7,000 (derivative) @ $0 · Option exercise (M): 8,000 (derivative) @ $0 | EDGAR |
| 2024-11-13 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) | Option exercise (M): 6,893 @ $14.95 · Sale (S): 6,893 @ $48.88 · Option exercise (M): 6,893 (derivative) @ $0 | EDGAR |
| 2024-09-17 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) | Option exercise (M): 3,000 @ $14.95 · Sale (S): 3,000 @ $48.26 · Option exercise (M): 3,000 (derivative) @ $0 | EDGAR |
| 2024-08-27 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) | Option exercise (M): 4,000 @ $14.95 · Sale (S): 4,000 @ $48.35 · Option exercise (M): 4,000 (derivative) @ $0 | EDGAR |
| 2024-03-19 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) | Tax withholding (F): 1,219 @ $43.05 · Tax withholding (F): 2,355 @ $43.05 · Tax withholding (F): 1,961 @ $43.05 | EDGAR |
| 2024-03-08 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) | Tax withholding (F): 1,390 @ $46.31 | EDGAR |
| 2024-03-06 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) | Grant/award (A): 12,521 @ $0 · Grant/award (A): 26,378 (derivative) @ $0 | EDGAR |
FilingPulse's Form 4 archive currently extends back to 2024-01-11 and is expanding backward through EDGAR history — earlier filings by this insider may not be indexed yet. Names and roles are shown as filed.
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