AMPH
Amphastar P
NASDAQ: AMPH · HEALTHCARE · DRUG MANUFACTURERS - SPECIALTY & GENERIC
$23.90
+2.18% today
Updated 2026-05-06
Market cap
$974.42M
P/E ratio
10.78
P/S ratio
1.35x
EPS (TTM)
$2.03
Dividend yield
—
52W range
$17 – $31
Volume
0.6M
Amphastar P (AMPH) Insider transactions
Net insider activity
Net buying (1,482,075 shares)
Buy transactions
38
Sell transactions
62
All transactions
| Date | Insider | Title | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-03-15 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Sale | 1,225 | $18.18 | $22270.50 |
| 2026-03-15 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Sale | 9,784 | $18.18 | $177873.12 |
| 2026-03-15 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Sale | 2,908 | $18.18 | $52867.44 |
| 2026-03-15 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Sale | 1,973 | $18.18 | $35869.14 |
| 2026-03-15 | LIAWATIDEWI, YAKOB | Director, EVP CORP ADMIN CENTER | Sale | 1,033 | $18.18 | $18779.94 |
| 2026-03-10 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Sale | 2,215 | $18.91 | $41885.65 |
| 2026-03-10 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Sale | 14,785 | $18.91 | $279584.35 |
| 2026-03-10 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Sale | 4,395 | $18.91 | $83109.45 |
| 2026-03-10 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Sale | 3,297 | $18.91 | $62346.27 |
| 2026-03-10 | LIAWATIDEWI, YAKOB | Director, EVP CORP ADMIN CENTER | Sale | 1,870 | $18.91 | $35361.70 |
| 2026-03-09 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Buy | 81,341 | — | — |
| 2026-03-09 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Buy | 39,432 | — | — |
| 2026-03-09 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Buy | 372,338 | — | — |
| 2026-03-09 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Buy | 149,472 | — | — |
| 2026-03-09 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Buy | 180,504 | — | — |
| 2026-03-09 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Buy | 72,462 | — | — |
| 2026-03-09 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Buy | 121,071 | — | — |
| 2026-03-09 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Buy | 58,693 | — | — |
| 2026-03-09 | LIAWATIDEWI, YAKOB | Director, EVP CORP ADMIN CENTER | Buy | 73,126 | — | — |
| 2026-03-09 | LIAWATIDEWI, YAKOB | Director, EVP CORP ADMIN CENTER | Buy | 35,450 | — | — |
| 2026-03-06 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Sale | 1,357 | $19.34 | $26244.38 |
| 2026-03-06 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Sale | 7,773 | $19.34 | $150329.82 |
| 2026-03-06 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Sale | 3,077 | $19.34 | $59509.18 |
| 2026-03-06 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Sale | 2,146 | $19.34 | $41503.64 |
| 2026-03-06 | LIAWATIDEWI, YAKOB | Director, EVP CORP ADMIN CENTER | Sale | 1,144 | $19.34 | $22124.96 |
| 2026-03-04 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Sale | 1,124 | $19.96 | $22435.04 |
| 2026-03-04 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Sale | 5,769 | $19.96 | $115149.24 |
| 2026-03-04 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Sale | 2,432 | $19.96 | $48542.72 |
| 2026-03-04 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Sale | 1,744 | $19.96 | $34810.24 |
| 2026-03-04 | LIAWATIDEWI, YAKOB | Director, EVP CORP ADMIN CENTER | Sale | 965 | $19.96 | $19261.40 |
| 2025-12-17 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Sale | 9,787 | — | — |
| 2025-12-17 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Buy | 9,787 | $11.33 | $110886.71 |
| 2025-12-12 | PETERSEN, FLOYD F. | Director | Sale | 2,426 | $25.92 | $62888.23 |
| 2025-12-11 | PETERSEN, FLOYD F. | Director | Sale | 1,737 | $25.69 | $44620.06 |
| 2025-11-25 | PRINS, RICHARD K | Director | Sale | 4,179 | — | — |
| 2025-11-25 | PRINS, RICHARD K | Director | Sale | 4,179 | $27.10 | $113253.41 |
| 2025-11-13 | PETERSEN, FLOYD F. | Director | Sale | 16,679 | — | — |
| 2025-11-13 | PETERSEN, FLOYD F. | Director | Sale | 16,679 | $26.49 | $441836.72 |
| 2025-11-03 | PETERSEN, FLOYD F. | Director | Sale | 500 | $25.27 | $12633.10 |
| 2025-10-01 | PETERSEN, FLOYD F. | Director | Sale | 500 | $27.20 | $13602.40 |
| 2025-09-02 | PETERSEN, FLOYD F. | Director | Sale | 500 | $30.98 | $15491.65 |
| 2025-08-01 | PETERSEN, FLOYD F. | Director | Sale | 500 | $20.83 | $10415.75 |
| 2025-07-18 | GAUGH, DAVID RUSSELL | Director | Buy | 13,987 | — | — |
| 2025-07-18 | GAUGH, DAVID RUSSELL | Director | Buy | 6,304 | — | — |
| 2025-07-02 | PETERSEN, FLOYD F. | Director | Sale | 500 | $23.47 | $11733.95 |
| 2025-06-13 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Sale | 200,000 | — | — |
| 2025-06-13 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Buy | 200,000 | $13.03 | $2.61M |
| 2025-06-03 | LEE, HOWARD | Director | Sale | 923 | $26.01 | $24007.23 |
| 2025-06-02 | ZASLOFF, MICHAEL A | Director | Buy | 11,402 | — | — |
| 2025-06-02 | ZASLOFF, MICHAEL A | Director | Buy | 5,122 | — | — |
| 2025-06-02 | PRINS, RICHARD K | Director | Buy | 11,402 | — | — |
| 2025-06-02 | PRINS, RICHARD K | Director | Buy | 5,122 | — | — |
| 2025-06-02 | PETERSEN, FLOYD F. | Director | Buy | 11,402 | — | — |
| 2025-06-02 | PETERSEN, FLOYD F. | Director | Buy | 5,122 | — | — |
| 2025-06-02 | PETERSEN, FLOYD F. | Director | Sale | 500 | $25.67 | $12835.05 |
| 2025-06-02 | LEE, HOWARD | Director | Buy | 11,402 | — | — |
| 2025-06-02 | LEE, HOWARD | Director | Buy | 5,122 | — | — |
| 2025-06-02 | GERST, DIANE G. | Director | Buy | 11,402 | — | — |
| 2025-06-02 | GERST, DIANE G. | Director | Buy | 5,122 | — | — |
| 2025-06-02 | DEFLIN, GAYLE | Director | Buy | 11,402 | — | — |
| 2025-06-02 | DEFLIN, GAYLE | Director | Buy | 5,122 | — | — |
| 2025-05-19 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Sale | 273 | $24.79 | $6767.67 |
| 2025-05-01 | PETERSEN, FLOYD F. | Director | Sale | 500 | $24.08 | $12041.45 |
| 2025-04-01 | PETERSEN, FLOYD F. | Director | Sale | 500 | $28.38 | $14190.25 |
| 2025-03-17 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Sale | 1,967 | $27.69 | $54466.23 |
| 2025-03-17 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Sale | 16,150 | $27.69 | $447193.50 |
| 2025-03-17 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Sale | 7,223 | $27.69 | $200004.87 |
| 2025-03-17 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Sale | 3,004 | $27.69 | $83180.76 |
| 2025-03-17 | LIAWATIDEWI, YAKOB | Director, EVP CORP ADMIN CENTER | Sale | 1,731 | $27.69 | $47931.39 |
| 2025-03-15 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Sale | 1,222 | $26.66 | $32578.52 |
| 2025-03-15 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Sale | 9,765 | $26.66 | $260334.90 |
| 2025-03-15 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Sale | 4,115 | $26.66 | $109705.90 |
| 2025-03-15 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Sale | 1,968 | $26.66 | $52466.88 |
| 2025-03-15 | LIAWATIDEWI, YAKOB | Director, EVP CORP ADMIN CENTER | Sale | 1,031 | $26.66 | $27486.46 |
| 2025-03-14 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Sale | 290,477 | — | — |
| 2025-03-14 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Sale | 211,213 | — | — |
| 2025-03-14 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Buy | 290,477 | $14.69 | $4.27M |
| 2025-03-14 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Sale | 226,285 | $26.66 | $6.03M |
| 2025-03-14 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Buy | 211,213 | $14.69 | $3.10M |
| 2025-03-14 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Sale | 162,657 | $26.66 | $4.34M |
| 2025-03-10 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Buy | 52,437 | — | — |
| 2025-03-10 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Buy | 24,692 | — | — |
| 2025-03-10 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Buy | 246,821 | — | — |
| 2025-03-10 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Buy | 104,052 | — | — |
| 2025-03-10 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Buy | 116,226 | — | — |
| 2025-03-10 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Buy | 48,996 | — | — |
| 2025-03-10 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Buy | 78,039 | — | — |
| 2025-03-10 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Buy | 36,747 | — | — |
| 2025-03-10 | LIAWATIDEWI, YAKOB | Director, EVP CORP ADMIN CENTER | Buy | 44,253 | — | — |
| 2025-03-10 | LIAWATIDEWI, YAKOB | Director, EVP CORP ADMIN CENTER | Buy | 20,837 | — | — |
| 2025-03-06 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Sale | 1,354 | $28.32 | $38345.28 |
| 2025-03-06 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Sale | 9,645 | $28.32 | $273146.40 |
| 2025-03-06 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Sale | 3,069 | $28.32 | $86914.08 |
| 2025-03-06 | PETERSEN, FLOYD F. | Director | Sale | 1,000 | $27.99 | $27986.30 |
| 2025-03-06 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Sale | 2,141 | $28.32 | $60633.12 |
| 2025-03-06 | LIAWATIDEWI, YAKOB | Director, EVP CORP ADMIN CENTER | Sale | 1,141 | $28.32 | $32313.12 |
| 2025-03-04 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Sale | 1,121 | $27.62 | $30962.02 |
| 2025-03-04 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Sale | 5,753 | $27.62 | $158897.86 |
| 2025-03-04 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Sale | 2,426 | $27.62 | $67006.12 |
| 2025-03-04 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Sale | 7,490 | — | — |