AMPH insider transaction filings
Amphastar Pharmaceuticals, Inc. — 50 most recent Form 4 filings from SEC EDGAR, normalized by FilingPulse. Latest filing: 2026-08-12. Screen AMPH transaction legs live →
| Filed | Form | Insider | Reported transactions | Source |
|---|---|---|---|---|
| 2026-08-12 | 4 | PRINS RICHARD K — Director | Sale (S): 7,973 @ $20.30 | EDGAR |
| 2026-08-11 | 4 | PETERS WILLIAM J — CFO, EVP & TREASURER, Director | Option exercise (M): 5,053 @ $19.79 · Sale (S): 8,180 @ $22.48 · Option exercise (M): 5,053 (derivative) @ $0 | EDGAR |
| 2026-07-13 | 4 | Pierce Anthony T — Director | Grant/award (A): 7,886 @ $0 · Grant/award (A): 16,646 (derivative) @ $0 | EDGAR |
| 2026-06-03 | 4 | Gaugh David Russell — Director | Grant/award (A): 8,143 @ $0 · Grant/award (A): 17,365 (derivative) @ $0 | EDGAR |
| 2026-06-03 | 4 | Deflin Gayle — Director | Grant/award (A): 8,143 @ $0 · Grant/award (A): 17,365 (derivative) @ $0 | EDGAR |
| 2026-06-03 | 4 | Gerst Diane G. — Director | Grant/award (A): 8,143 @ $0 · Grant/award (A): 17,365 (derivative) @ $0 | EDGAR |
| 2026-06-03 | 4 | Lee Howard — Director | Grant/award (A): 8,143 @ $0 · Tax withholding (F): 769 @ $18.45 · Grant/award (A): 17,365 (derivative) @ $0 | EDGAR |
| 2026-06-03 | 4 | PRINS RICHARD K — Director | Gift (G): 1,500 @ $0 · Grant/award (A): 8,143 @ $0 · Grant/award (A): 17,365 (derivative) @ $0 | EDGAR |
| 2026-06-03 | 4 | ZASLOFF MICHAEL A — Director | Grant/award (A): 8,143 @ $0 · Grant/award (A): 17,365 (derivative) @ $0 | EDGAR |
| 2026-03-17 | 4 | Liawatidewi Yakob — EVP CORP ADMIN CENTER, Director | Tax withholding (F): 1,033 @ $18.18 | EDGAR |
| 2026-03-17 | 4 | Zhou Rong — SENIOR EVP, PRODUCTION CENTER | Tax withholding (F): 1,225 @ $18.18 | EDGAR |
| 2026-03-17 | 4 | Zhang Jack Y. — CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% owner Luo Mary Z. — COO, Chief Scientist, Chairman, Director, 10% owner | Tax withholding (F): 9,784 @ $18.18 · Tax withholding (F): 2,908 @ $18.18 | EDGAR |
| 2026-03-17 | 4 | PETERS WILLIAM J — CFO, EVP & TREASURER, Director | Tax withholding (F): 1,973 @ $18.18 | EDGAR |
| 2026-03-11 | 4 | Liawatidewi Yakob — EVP CORP ADMIN CENTER, Director | Grant/award (A): 35,450 @ $0 · Tax withholding (F): 1,870 @ $18.91 · Grant/award (A): 73,126 (derivative) @ $0 | EDGAR |
| 2026-03-11 | 4 | Zhou Rong — SENIOR EVP, PRODUCTION CENTER | Grant/award (A): 39,432 @ $0 · Tax withholding (F): 2,215 @ $18.91 · Grant/award (A): 81,341 (derivative) @ $0 | EDGAR |
| 2026-03-11 | 4 | Zhang Jack Y. — CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% owner Luo Mary Z. — COO, Chief Scientist, Chairman, Director, 10% owner | 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 |
| 2026-03-11 | 4 | PETERS WILLIAM J — CFO, EVP & TREASURER, Director | Grant/award (A): 58,693 @ $0 · Tax withholding (F): 3,297 @ $18.91 · Grant/award (A): 121,071 (derivative) @ $0 | EDGAR |
| 2026-03-10 | 4 | Liawatidewi Yakob — EVP CORP ADMIN CENTER, Director | Tax withholding (F): 1,144 @ $19.34 | EDGAR |
| 2026-03-10 | 4 | Zhou Rong — SENIOR EVP, PRODUCTION CENTER | Tax withholding (F): 1,357 @ $19.34 | EDGAR |
| 2026-03-10 | 4 | Zhang Jack Y. — CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% owner Luo Mary Z. — COO, Chief Scientist, Chairman, Director, 10% owner | Tax withholding (F): 7,773 @ $19.34 · Tax withholding (F): 3,077 @ $19.34 | EDGAR |
| 2026-03-10 | 4 | PETERS WILLIAM J — CFO, EVP & TREASURER, Director | Tax withholding (F): 2,146 @ $19.34 | EDGAR |
| 2026-03-06 | 4 | Liawatidewi Yakob — EVP CORP ADMIN CENTER, Director | Tax withholding (F): 965 @ $19.96 | EDGAR |
| 2026-03-06 | 4 | Zhou Rong — SENIOR EVP, PRODUCTION CENTER | Tax withholding (F): 1,124 @ $19.96 | EDGAR |
| 2026-03-06 | 4 | Zhang Jack Y. — CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% owner Luo Mary Z. — COO, Chief Scientist, Chairman, Director, 10% owner | Tax withholding (F): 5,769 @ $19.96 · Tax withholding (F): 2,432 @ $19.96 | EDGAR |
| 2026-03-06 | 4 | PETERS WILLIAM J — CFO, EVP & TREASURER, Director | Tax withholding (F): 1,744 @ $19.96 | EDGAR |
| 2025-12-18 | 4 | Zhou Rong — SENIOR EVP, PRODUCTION CENTER | Option exercise (M): 9,787 @ $11.33 · Sale (S): 9,787 @ $26.20 · Option exercise (M): 9,787 (derivative) @ $0 | EDGAR |
| 2025-12-15 | 4 | Petersen Floyd F. — Director | Sale (S): 1,737 @ $25.69 · Sale (S): 2,426 @ $25.92 | EDGAR |
| 2025-11-25 | 4 | PRINS RICHARD K — Director | Option exercise (M): 4,179 @ $16.69 · Sale (S): 4,179 @ $27.10 · Option exercise (M): 4,179 (derivative) @ $0 | EDGAR |
| 2025-11-17 | 4 | Petersen Floyd F. — Director | Option exercise (M): 16,679 @ $16.69 · Sale (S): 16,679 @ $26.49 · Option exercise (M): 16,679 (derivative) @ $0 | EDGAR |
| 2025-11-05 | 4 | Petersen Floyd F. — Director | Sale (S): 500 @ $25.27 | EDGAR |
| 2025-10-02 | 4 | Petersen Floyd F. — Director | Sale (S): 500 @ $27.20 | EDGAR |
| 2025-09-03 | 4 | Petersen Floyd F. — Director | Sale (S): 500 @ $30.98 | EDGAR |
| 2025-08-04 | 4 | Petersen Floyd F. — Director | Sale (S): 500 @ $20.83 | EDGAR |
| 2025-07-22 | 4 | Gaugh David Russell — Director | Grant/award (A): 6,304 @ $0 · Grant/award (A): 13,987 (derivative) @ $0 | EDGAR |
| 2025-07-03 | 4 | Petersen Floyd F. — Director | Sale (S): 500 @ $23.47 | EDGAR |
| 2025-06-16 | 4 | Zhang Jack Y. — CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% owner Luo Mary Z. — COO, Chief Scientist, Chairman, Director, 10% owner | Option exercise (M): 200,000 @ $13.03 · Option exercise (M): 200,000 (derivative) @ $0 | EDGAR |
| 2025-06-04 | 4 | Lee Howard — Director | Grant/award (A): 5,122 @ $0 · Tax withholding (F): 923 @ $26.01 · Grant/award (A): 11,402 (derivative) @ $0 | EDGAR |
| 2025-06-04 | 4 | Deflin Gayle — Director | Grant/award (A): 5,122 @ $0 · Grant/award (A): 11,402 (derivative) @ $0 | EDGAR |
| 2025-06-04 | 4 | Gerst Diane G. — Director | Grant/award (A): 5,122 @ $0 · Grant/award (A): 11,402 (derivative) @ $0 | EDGAR |
| 2025-06-04 | 4 | Petersen Floyd F. — Director | Sale (S): 500 @ $25.67 · Grant/award (A): 5,122 @ $0 · Grant/award (A): 11,402 (derivative) @ $0 | EDGAR |
| 2025-06-04 | 4 | PRINS RICHARD K — Director | Grant/award (A): 5,122 @ $0 · Grant/award (A): 11,402 (derivative) @ $0 | EDGAR |
| 2025-06-04 | 4 | ZASLOFF MICHAEL A — Director | Grant/award (A): 5,122 @ $0 · Grant/award (A): 11,402 (derivative) @ $0 | EDGAR |
| 2025-05-20 | 4 | PETERS WILLIAM J — CFO, EVP & TREASURER, Director | Tax withholding (F): 273 @ $24.79 | EDGAR |
| 2025-05-02 | 4 | Petersen Floyd F. — Director | Sale (S): 500 @ $24.08 | EDGAR |
| 2025-04-02 | 4 | Petersen Floyd F. — Director | Sale (S): 500 @ $28.38 | EDGAR |
| 2025-03-18 | 4 | Zhou Rong — SENIOR EVP, PRODUCTION CENTER | Tax withholding (F): 1,222 @ $26.66 · Tax withholding (F): 1,967 @ $27.69 | EDGAR |
| 2025-03-18 | 4 | Zhang Jack Y. — CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% owner Luo Mary Z. — COO, Chief Scientist, Chairman, Director, 10% owner | 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 |
| 2025-03-18 | 4 | Liawatidewi Yakob — EVP CORP ADMIN CENTER, Director | Tax withholding (F): 1,031 @ $26.66 · Tax withholding (F): 1,731 @ $27.69 | EDGAR |
| 2025-03-18 | 4 | PETERS WILLIAM J — CFO, EVP & TREASURER, Director | Tax withholding (F): 1,968 @ $26.66 · Tax withholding (F): 3,004 @ $27.69 | EDGAR |
| 2025-03-12 | 4 | Zhou Rong — SENIOR EVP, PRODUCTION CENTER | Grant/award (A): 24,692 @ $0 · Grant/award (A): 52,437 (derivative) @ $0 | EDGAR |
Recent 8-K events — Amphastar Pharmaceuticals, Inc.
| Filed | Form | Items reported | Source |
|---|---|---|---|
| 2026-08-06 | 8-K | 2.02 — Results of Operations and Financial Condition 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-07-13 | 8-K | 5.02 — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers | EDGAR |
| 2026-07-08 | 8-K | 8.01 — Other Events | EDGAR |
| 2026-06-03 | 8-K | 5.07 — Submission of Matters to a Vote of Security Holders | EDGAR |
| 2026-05-07 | 8-K | 2.02 — Results of Operations and Financial Condition 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-03-16 | 8-K | 8.01 — Other Events | EDGAR |
| 2026-03-06 | 8-K | 5.02 — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-03-06 | 8-K | 1.01 — Entry into a Material Definitive Agreement 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-02-26 | 8-K | 2.02 — Results of Operations and Financial Condition 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-01-12 | 8-K | 1.01 — Entry into a Material Definitive Agreement 7.01 — Regulation FD Disclosure 9.01 — Financial Statements and Exhibits | EDGAR |
Need this as JSON?
GET https://api.filingpulse.io/v1/insider-trades?ticker=AMPH returns every filing on this page — normalized, with footnotes and derivative legs — and webhooks push new ones to you in seconds. API docs →