SEC Form 4 · accession 0001047579-26-000003
Amphastar Pharmaceuticals, Inc. · AMPH
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Richard K Prins
Director
Period of report
Aug 19, 2024
Accepted (ET)
Jun 3, 2026 · 9:22 pm EDT
Rule 10b5-1 plan
box not checked
Issuer CIK
0001297184
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common StockF1 | Aug 19, 2024 | G | 1,500 | $0.00 | D | 29,455 | D | |
| Common StockF2 | Jun 1, 2026 | A | 8,143 | $0.00 | A | 37,598 | D |
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Stock Option (right to buy)F3 | $18.42 | Jun 1, 2026 | A | 17,365 | A | — | Jun 1, 2036 | Common Stock | 17,365 | 17,365 | D |
Explanation of responses
- F1The number of shares beneficially owned following the reported transaction is as of June 1, 2026 and has been reduced by 4,228 shares to reflect a reconciliation to the reporting person's account records.
- F2The reported shares are represented by restricted stock units, or RSUs, all of which vest on June 1, 2027.
- F3All of the shares subject to the option vest on June 1, 2027.