Form 4 for AMPH Amphastar Pharmaceuticals, Inc.
Accepted 2026-03-11 00:00:00 ET · period of report 2026-03-09 · accession 0000889740-26-000005 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| D | 2026-03-11 | 2026-03-09 | AMPH | Zhang Jack Y. | CEO, CSO, Dir, 10% | A - Grant | $0.00 | +180.5K | 3.01M | +6% | $0 |
| DI | 2026-03-11 | 2026-03-10 | AMPH | Zhang Jack Y. | CEO, CSO, Dir, 10% | F - Tax | $18.91 | -4,395 | 1.25M | -0.4% | -$83.1K |
| DI | 2026-03-11 | 2026-03-09 | AMPH | Zhang Jack Y. | CEO, CSO, Dir, 10% | A - Grant | $0.00 | +72.5K | 1.25M | +6% | $0 |
| D | 2026-03-11 | 2026-03-10 | AMPH | Zhang Jack Y. | CEO, CSO, Dir, 10% | F - Tax | $18.91 | -14.8K | 3.00M | -0.5% | -$279.6K |
| D | 2026-03-11 | 2026-03-09 | AMPH | Zhang Jack Y. | CEO, CSO, Dir, 10% | A - Grant | $0.00 | +372.3K | 372.3K | New | $0 |
| DI | 2026-03-11 | 2026-03-09 | AMPH | Zhang Jack Y. | CEO, CSO, Dir, 10% | A - Grant | $0.00 | +149.5K | 149.5K | New | $0 |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Common Stock | 2026-03-09 | A | A | 180,504 | $0.00 | 3,014,621 | D | — | — | (F1) The reported shares are represented by restricted stock units, or RSUs, which vest in four equal annual installments beginning on March 9, 2027. |
| 2 | Common | Common Stock | 2026-03-10 | F | D | 4,395 | $18.91 | 1,248,033 | I See footnote | — | — | (F2) The reported shares were withheld to satisfy the reporting person's tax liability in connection with the vesting of RSUs. (F3) The securities are held of record by Mary Z. Luo. The reporting persons are husband and wife. |
| 3 | Common | Common Stock | 2026-03-09 | A | A | 72,462 | $0.00 | 1,252,428 | I See footnote | — | — | (F1) The reported shares are represented by restricted stock units, or RSUs, which vest in four equal annual installments beginning on March 9, 2027. (F3) The securities are held of record by Mary Z. Luo. The reporting persons are husband and wife. |
| 4 | Common | Common Stock | 2026-03-10 | F | D | 14,785 | $18.91 | 2,999,836 | D | — | — | (F2) The reported shares were withheld to satisfy the reporting person's tax liability in connection with the vesting of RSUs. |
| 5 | Derivative | Employee Stock Option (right to buy) | 2026-03-09 | A | A | 372,338 | $0.00 | 372,338 | D | $19.21 · — to 2036-03-09 | 372,338 Common Stock | (F5) The shares subject to the option vest in four equal annual installments beginning on March 9, 2027. |
| 6 | Derivative | Employee Stock Option (right to buy) | 2026-03-09 | A | A | 149,472 | $0.00 | 149,472 | I See footnote | $19.21 · — to 2036-03-09 | 149,472 Common Stock | (F3) The securities are held of record by Mary Z. Luo. The reporting persons are husband and wife. (F5) The shares subject to the option vest in four equal annual installments beginning on March 9, 2027. |