Zhang Jack Y. — SEC Form 4 filings
SEC reporting owner CIK 1611157. 17 Form 4 filings on record with FilingPulse; latest filed 2026-03-17.
Transaction summary — filings shown
Covers all 17 filings on record, filed 2024-01-10 to 2026-03-17. 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): 14 legs across 2 filings — 351,186 shares, $19,970,476 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 52.
- Largest priced transaction: sale of 78,236 shares @ $54.32 ($4,249,967) in Amphastar Pharmaceuticals, Inc., filed 2024-01-11.
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) | CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% owner | 17 | — | 14 legs · 351,186 sh · $19,970,476 | 52 |
Form 4 filings — Zhang Jack Y.
| Filed | Form | Issuer | Reported transactions | Source |
|---|---|---|---|---|
| 2026-03-17 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) jointly with Luo Mary Z. | Tax withholding (F): 9,784 @ $18.18 · Tax withholding (F): 2,908 @ $18.18 | EDGAR |
| 2026-03-11 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) jointly with Luo Mary Z. | Grant/award (A): 180,504 @ $0 · Tax withholding (F): 14,785 @ $18.91 · Grant/award (A): 72,462 @ $0 · Tax withholding (F): 4,395 @ $18.91 · Grant/award (A): 372,338 (derivative) @ $0 · Grant/award (A): 149,472 (derivative) @ $0 | EDGAR |
| 2026-03-10 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) jointly with Luo Mary Z. | Tax withholding (F): 7,773 @ $19.34 · Tax withholding (F): 3,077 @ $19.34 | EDGAR |
| 2026-03-06 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) jointly with Luo Mary Z. | Tax withholding (F): 5,769 @ $19.96 · Tax withholding (F): 2,432 @ $19.96 | EDGAR |
| 2025-06-16 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) jointly with Luo Mary Z. | Option exercise (M): 200,000 @ $13.03 · Option exercise (M): 200,000 (derivative) @ $0 | EDGAR |
| 2025-03-18 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) jointly with Luo Mary Z. | Option exercise (M): 290,477 @ $14.69 · Tax withholding (F): 226,285 @ $26.66 · Tax withholding (F): 9,765 @ $26.66 · Tax withholding (F): 16,150 @ $27.69 · Option exercise (M): 211,213 @ $14.69 · Tax withholding (F): 162,657 @ $26.66 · +4 more | EDGAR |
| 2025-03-12 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) jointly with Luo Mary Z. | Grant/award (A): 116,226 @ $0 · Grant/award (A): 48,996 @ $0 · Grant/award (A): 246,821 (derivative) @ $0 · Grant/award (A): 104,052 (derivative) @ $0 | EDGAR |
| 2025-03-10 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) jointly with Luo Mary Z. | Tax withholding (F): 9,645 @ $28.32 · Tax withholding (F): 3,069 @ $28.32 | EDGAR |
| 2025-03-06 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) jointly with Luo Mary Z. | Tax withholding (F): 5,753 @ $27.62 · Tax withholding (F): 2,426 @ $27.62 | EDGAR |
| 2024-11-12 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) jointly with Luo Mary Z. | Gift (G): 125,000 @ $0 · Gift (G): 125,000 @ $0 | EDGAR |
| 2024-09-16 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) jointly with Luo Mary Z. | Option exercise (M): 100,000 @ $14.69 · Option exercise (M): 100,000 (derivative) @ $0 | EDGAR |
| 2024-06-11 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) jointly with Luo Mary Z. | Option exercise (M): 100,000 @ $14.69 · Option exercise (M): 100,000 (derivative) @ $0 | EDGAR |
| 2024-03-19 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) jointly with Luo Mary Z. | Option exercise (M): 722,046 @ $12.46 · Tax withholding (F): 408,721 @ $43.05 · Tax withholding (F): 15,768 @ $43.05 · Option exercise (M): 310,930 @ $12.46 · Tax withholding (F): 202,658 @ $43.05 · Tax withholding (F): 7,052 @ $43.05 · +2 more | EDGAR |
| 2024-03-08 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) jointly with Luo Mary Z. | Tax withholding (F): 7,031 @ $46.31 · Tax withholding (F): 2,990 @ $46.31 | EDGAR |
| 2024-03-06 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) jointly with Luo Mary Z. | Grant/award (A): 64,310 @ $0 · Grant/award (A): 27,110 @ $0 · Grant/award (A): 135,473 (derivative) @ $0 · Grant/award (A): 57,109 (derivative) @ $0 | EDGAR |
| 2024-01-11 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) jointly with Luo Mary Z. | Sale (S): 78,236 @ $54.32 · Sale (S): 50,514 @ $54.89 · Sale (S): 920 @ $55.95 · Sale (S): 1,716 @ $57.00 | EDGAR |
| 2024-01-10 | 4 | Amphastar Pharmaceuticals, Inc. (AMPH) jointly with Luo Mary Z. | Sale (S): 18,858 @ $56.98 · Sale (S): 41,282 @ $58.25 · Sale (S): 37,865 @ $59.24 · Sale (S): 27,563 @ $59.99 · Sale (S): 4,261 @ $61.19 · Sale (S): 1,663 @ $61.81 · +4 more | EDGAR |
FilingPulse's Form 4 archive currently extends back to 2024-01-10 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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