AMPH insider buying and SEC filings, explained
Amphastar Pharmaceuticals, Inc. · CIK 1297184
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$0
Insiders who bought
0
Sold (not marked 10b5-1)
$345K
Planned sales (10b5-1)
$300K
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Sep 21, 2026 | Planned (10b5-1) | William J. Peters (CFO and Director) sold 4,139 shares at $25.00 ($103K), marked as a 10b5-1 plan trade. Holdings down 2% to 168,707 shares. | SEC filing Filed Sep 23, 2026 |
| Sep 2, 2026 | Sale | Rong Zhou (Senior EVP, Production Center) sold 3,187 shares at about $23.63 ($75K). Holdings down 2% to 169,203 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 3, 2026 |
| Aug 11, 2026 | Sale | Richard K. Prins (Director) sold 7,973 shares at $20.30 ($162K). Holdings down 21% to 29,625 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 12, 2026 |
| Aug 7, 2026 | Planned (10b5-1) | William J. Peters (CFO and Director) sold 8,180 shares at $22.48 ($184K), marked as a 10b5-1 plan trade. Holdings down 5% to 172,846 shares. | SEC filing Filed Aug 11, 2026 |
| Dec 11–12, 2025 | Sale | Floyd F. Petersen (Director) sold 4,163 shares between Dec 11, 2025 and Dec 12, 2025 at about $25.82 ($108K). Holdings down 6% to 71,368 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 15, 2025 |
| Nov 3, 2025 | Planned (10b5-1) | Floyd F. Petersen (Director) sold 500 shares at about $25.27 ($13K), marked as a 10b5-1 plan trade. Holdings down 1% to 75,531 shares. | SEC filing Filed Nov 5, 2025 |
32 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
No cluster buys in the last 12 months.
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
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