Insider holders · CIK 0001297184
Amphastar Pharmaceuticals, Inc. · AMPH
Every insider with a reported Table I holding at this company, ranked by their last-reported share count. A balance is only as fresh as its filing — the report date sits next to every row on purpose. ← Back to activity
| Insider | Direct shares | Indirect shares | Total reported | Last report (ET) | From |
|---|---|---|---|---|---|
| Applied Physics & Chemistry Laboratories, Inc.10% Owner | 7,327,679 | — | 7,327,679 | Dec 13, 2018 · 8:05 pm EST | Form 4 |
| Jack Y. ZhangCEO & Chief Scientific Officer | 2,072,317 | 200,000 | 2,272,317 | Dec 17, 2018 · 8:02 pm EST | Form 4 |
| Mary Z. LuoCOO,Chief Scientist & Chairman | 2,072,317 | 200,000 | 2,272,317 | Dec 17, 2018 · 8:02 pm EST | Form 4 |
| Richard KooDirector | 241,928 | 10,000 | 251,928 | Dec 12, 2018 · 8:39 pm EST | Form 4 |
| Rong ZhouSENIOR EVP, PRODUCTION CENTER | 169,203 | 5,000 | 174,203 | Sep 17, 2026 · 6:19 pm EDT | Form 4 |
| William J PetersCFO, EVP & TREASURER | 168,707 | — | 168,707 | Sep 23, 2026 · 6:02 pm EDT | Form 4 |
| Jason B. ShandellPresident and General Counsel | 168,318 | — | 168,318 | Mar 1, 2019 · 8:01 pm EST | Form 4 |
| Howard LeeDirector | 159,350 | — | 159,350 | Jun 3, 2026 · 9:20 pm EDT | Form 4 |
| Floyd F. PetersenDirector | 71,151 | — | 71,151 | Dec 4, 2018 · 9:01 pm EST | Form 4 |
| Marilyn J. Purchaserelationship not stated | 43,263 | 16,044 | 59,307 | Jun 17, 2015 · 6:14 pm EDT | Form 4 |
| Yakob LiawatidewiSVP Corp Admin Center | 35,883 | 6,369 | 42,252 | Feb 14, 2019 · 6:30 pm EST | Form 4 |
| Michael A ZasloffDirector | 37,667 | — | 37,667 | Jun 3, 2026 · 8:34 pm EDT | Form 4 |
| Diane G. GerstDirector | 31,899 | — | 31,899 | Jun 3, 2026 · 8:33 pm EDT | Form 4 |
| Stephen B. ShohetDirector | 30,706 | — | 30,706 | Dec 12, 2018 · 8:37 pm EST | Form 4 |
| Richard K PrinsDirector | 29,625 | — | 29,625 | Aug 12, 2026 · 6:14 pm EDT | Form 4 |
| Gayle DeflinDirector | 19,057 | — | 19,057 | Jun 3, 2026 · 8:29 pm EDT | Form 4 |
| David Russell GaughDirector | 14,447 | — | 14,447 | Jun 3, 2026 · 8:31 pm EDT | Form 4 |
| Anthony T PierceDirector | 7,886 | — | 7,886 | Jul 13, 2026 · 7:38 pm EDT | Form 4 |
Balances come from each insider’s most recent filing that reports a Table I holding; an insider who left the company years ago still appears with their last-known figure and its date. Indirect totals collapse multiple vehicles (trusts, LLCs) into one number — open the filing for the breakdown. Shares as filed, not split-adjusted.