Amphastar Pharmaceuticals, Inc. (AMPH)
Data as of , from SEC Form 4 filings.
Net insider selling (90d)Watch AMPH
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About Amphastar Pharmaceuticals, Inc. (AMPH)
The SEC lists Amphastar Pharmaceuticals, Inc. under CIK 0001297184, in pharmaceutical preparations. We track it alongside the rest of the Health Care sector.
AMPH Form 4 activity by transaction type, last 90 days
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Open-market sale | 5 | 33,479 | $764K |
| Option exercise | 4 | 30,106 |
Dollar totals cover purchases and sales only (codes P and S). Grants, option exercises, gifts and tax withholding are counted in shares, because none of them is a trade at a market price.
AMPH insider transactions (Form 4)
6153 Form 4 filings on record, the earliest from Nov 8, 2024, newest first. Filing history page 1 of 2.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| William J. Peters - Officer | Open-market sale | Common Stock | 4,139 | $25.00 | $103K | |
| Rong Zhou - Officer | Option exercise | Common Stock | 10,000 | $13.35 | $134K | |
| Rong Zhou - Officer | Open-market sale | Common Stock | 10,000 | $23.94 footnote F1 | $239K | |
| Rong Zhou - Officer | Option exercise | Employee Stock Option (right to buy) | 10,000 | $0.00 | - | |
| ||||||
| Rong Zhou - Officer | Open-market sale | Common Stock | 3,187 | $23.63 footnote F1 | $75K | |
| ||||||
| Richard K. Prins - Director | Open-market sale | Common Stock | 7,973 | $20.30 | $162K | |
| William J. Peters - Officer | Option exercise | Common Stock | 5,053 | $19.79 | $100K | |
| William J. Peters - Officer | Open-market sale | Common Stock | 8,180 | $22.48 | $184K | |
| William J. Peters - Officer | Option exercise | Employee Stock Option (right to buy) | 5,053 | $0.00 | - | |
| Anthony T. Pierce | Grant or award | Common Stock | 7,886 footnote F1 | $0.00 | - | |
| Anthony T. Pierce | Grant or award | Stock Option (right to buy) | 16,646 | $0.00 | - | |
| ||||||
| Richard K. Prins | Gift | Common Stock | 1,500 | $0.00 | - | |
| Richard K. Prins | Grant or award | Common Stock | 8,143 footnote F2 | $0.00 | - | |
| Richard K. Prins | Grant or award | Stock Option (right to buy) | 17,365 | $0.00 | - | |
| ||||||
| Howard Lee | Grant or award | Common Stock | 8,143 footnote F1 | $0.00 | - | |
| Howard Lee | Tax withholding / forfeiture | Common Stock | 769 footnote F2 | $18.45 | $14K | |
| Howard Lee | Grant or award | Stock Option (right to buy) | 17,365 | $0.00 | - | |
| ||||||
| Michael A. Zasloff | Grant or award | Common Stock | 8,143 footnote F1 | $0.00 | - | |
| Michael A. Zasloff | Grant or award | Common Stock | 17,365 | $0.00 | - | |
| ||||||
| Diane G. Gerst | Grant or award | Common Stock | 8,143 footnote F1 | $0.00 | - | |
| Diane G. Gerst | Grant or award | Stock Option (right to buy) | 17,365 | $0.00 | - | |
| ||||||
| David Russell Gaugh | Grant or award | Common Stock | 8,143 footnote F1 | $0.00 | - | |
| David Russell Gaugh | Grant or award | Stock Option (right to buy) | 17,365 | $0.00 | - | |
| ||||||
| Gayle Deflin | Grant or award | Common Stock | 8,143 footnote F1 | $0.00 | - | |
| Gayle Deflin | Grant or award | Stock Option (right to buy) | 17,365 | $0.00 | - | |
| ||||||
| Yakob Liawatidewi - Officer | Tax withholding / forfeiture | Common Stock | 1,033 footnote F1 | $18.18 | $19K | |
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| Rong Zhou - Officer | Tax withholding / forfeiture | Common Stock | 1,225 footnote F1 | $18.18 | $22K | |
| ||||||
| William J. Peters - Officer | Tax withholding / forfeiture | Common Stock | 1,973 footnote F1 | $18.18 | $36K | |
| ||||||
| Jack Y. Zhang - Officer | Tax withholding / forfeiture | Common Stock | 9,784 footnote F1 | $18.18 | $178K | |
| Jack Y. Zhang - Officer | Tax withholding / forfeiture | Common Stock | 2,908 footnote F1 | $18.18 | $53K | |
| ||||||
| William J. Peters - Officer | Grant or award | Common Stock | 58,693 footnote F1 | $0.00 | - | |
| William J. Peters - Officer | Tax withholding / forfeiture | Common Stock | 3,297 footnote F2 | $18.91 | $62K | |
| William J. Peters - Officer | Grant or award | Employee Stock Option (right to buy) | 121,071 | $0.00 | - | |
| ||||||
| Rong Zhou - Officer | Grant or award | Common Srock | 39,432 footnote F1 | $0.00 | - | |
| Rong Zhou - Officer | Tax withholding / forfeiture | Common Stock | 2,215 footnote F2 | $18.91 | $42K | |
| Rong Zhou - Officer | Grant or award | Employee Stock Option (right to buy) | 81,341 | $0.00 | - | |
| ||||||
| Yakob Liawatidewi - Officer | Grant or award | Common Stock | 35,450 footnote F1 | $0.00 | - | |
| Yakob Liawatidewi - Officer | Tax withholding / forfeiture | Common Stock | 1,870 footnote F2 | $18.91 | $35K | |
| Yakob Liawatidewi - Officer | Grant or award | Employee Stock Option (right to buy) | 73,126 | $0.00 | - | |
| ||||||
| Jack Y. Zhang - Officer | Grant or award | Common Stock | 180,504 footnote F1 | $0.00 | - | |
| Jack Y. Zhang - Officer | Tax withholding / forfeiture | Common Stock | 14,785 footnote F2 | $18.91 | $280K | |
| Jack Y. Zhang - Officer | Grant or award | Common Stock | 72,462 footnote F1 | $0.00 | - | |
| Jack Y. Zhang - Officer | Tax withholding / forfeiture | Common Stock | 4,395 footnote F2 | $18.91 | $83K | |
| Jack Y. Zhang - Officer | Grant or award | Employee Stock Option (right to buy) | 372,338 | $0.00 | - | |
| Jack Y. Zhang - Officer | Grant or award | Employee Stock Option (right to buy) | 149,472 | $0.00 | - | |
| ||||||
| William J. Peters - Officer | Tax withholding / forfeiture | Common Stock | 2,146 footnote F1 | $19.34 | $42K | |
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| Rong Zhou - Officer | Tax withholding / forfeiture | Common Stock | 1,357 footnote F1 | $19.34 | $26K | |
| ||||||
| Yakob Liawatidewi - Officer | Tax withholding / forfeiture | Common Stock | 1,144 footnote F1 | $19.34 | $22K | |
| ||||||
| Jack Y. Zhang - Officer | Tax withholding / forfeiture | Common Stock | 7,773 footnote F1 | $19.34 | $150K | |
| Jack Y. Zhang - Officer | Tax withholding / forfeiture | Common Stock | 3,077 footnote F1 | $19.34 | $60K | |
| ||||||
| Jack Y. Zhang - Officer | Tax withholding / forfeiture | Common Stock | 5,769 footnote F1 | $19.96 | $115K | |
| Jack Y. Zhang - Officer | Tax withholding / forfeiture | Common Stock | 2,432 footnote F1 | $19.96 | $49K | |
| ||||||
| Rong Zhou - Officer | Tax withholding / forfeiture | Common Stock | 1,124 footnote F1 | $19.96 | $22K | |
| ||||||
| Yakob Liawatidewi - Officer | Tax withholding / forfeiture | Common Stock | 965 footnote F1 | $19.96 | $19K | |
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| William J. Peters - Officer | Tax withholding / forfeiture | Common Stock | 1,744 footnote F1 | $19.96 | $35K | |
| ||||||
| Richard K. Prins | Option exercise | Common Stock | 4,179 | $16.69 | $70K | |
| Richard K. Prins | Open-market sale | Common Stock | 4,179 | $27.10 footnote F1 | $113K | |
| Richard K. Prins | Option exercise | Stock Option (right to buy) | 4,179 | $0.00 | - | |
| ||||||
 Floyd F. Petersen | Option exercise | Common Stock | 16,679 | $16.69 | $278K | |
| Floyd F. Petersen | Open-market sale | Common Stock | 16,679 | $26.49 footnote F1 | $442K | |
| Floyd F. Petersen | Option exercise | Stock Option (right to buy) | 16,679 | $0.00 | - | |
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Item 2.02, 9.01
Item 5.02
Item 8.01
Item 5.07
Recent AMPH Form 144 notices of proposed sale
3An insider files Form 144 before selling restricted or control stock. It announces a planned sale. If the sale goes ahead, it shows up later on a Form 4.
| Filed | Filer | Relationship | Shares | Market value | Notice |
|---|---|---|---|---|---|
| PETERS WILLIAM J | Officer | 4,139 | $103K | View on EDGAR | |
| Rong Zhou | Vice President | 13,187 | $290K |
AMPH insider trading FAQ
What is the latest insider trade for AMPH?
Amphastar Pharmaceuticals, Inc. (AMPH) had 5 insider filings in the last 90 days, with the most recent on 2026-09-23. The full record for AMPH runs to 53 Form 4 filings, the earliest from 2024-11-08. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.
How many insiders are buying AMPH stock?
No insider purchases of AMPH were filed in the last 90 days.
How many insiders are selling AMPH stock?
5 insider sales of AMPH were filed in the last 90 days, totaling $764K.
Where can I see AMPH SEC filings (Form 4, 10-K, 10-Q, 8-K)?
This page collects AMPH Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
More Health Care companies with insider activity
Recent insider filings
10The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.
- - William J. Peters view on EDGAR
- - Rong Zhou view on EDGAR
- - Rong Zhou view on EDGAR
- - Richard K. Prins view on EDGAR
- - William J. Peters view on EDGAR
- - Anthony T. Pierce view on EDGAR
- - Richard K. Prins view on EDGAR
- - Howard Lee view on EDGAR
- - Michael A. Zasloff view on EDGAR
Related companies with recent insider activity
Learn more
- Insider selling: signal or noise?
- Why most insider sales are routine, and the few patterns worth a second look.
- Form 144 vs Form 4
- A Form 144 announces a planned sale; the Form 4 reports it after it happens.
- Insider activity in Health Care
- Where AMPH's peers are being bought and sold.
- Every recent Form 4
- The market-wide feed, updated as filings arrive from SEC EDGAR.
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