SEC Form 4 · accession 0001645326-26-000014
Amphastar Pharmaceuticals, Inc. · AMPH
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Rong Zhou
Officer — SENIOR EVP, PRODUCTION CENTER
Period of report
Sep 16, 2026
Accepted (ET)
Sep 17, 2026 · 6:19 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 Stock | Sep 16, 2026 | M | 10,000 | $13.35 | A | 179,203 | D | |
| Common StockF1 | Sep 16, 2026 | S | 10,000 | $23.9404 | D | 169,203 | D | |
| Common StockF2 | holding | — | — | — | 99,668 | I | See footnote | |
| Common StockF3 | holding | — | — | — | 5,000 | I | See footnote |
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Employee Stock Option (right to buy)F4 | $13.35 | Sep 16, 2026 | M | 10,000 | D | — | Mar 16, 2027 | Common Stock | 10,000 | 19,424 | D |
Explanation of responses
- F1The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.83 to $24.05, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.
- F2The shares are held of record by the Zhou Family Trust for which the reporting person serves as a trustee.
- F3The shares are held of record by the reporting person's spouse.
- F4Shares subject to the option are fully vested and immediately exercisable.