AMPH
Amphastar Pharmaceuticals, Inc. · Healthcare · Market cap $1.1B
Insiders sold $764K net in the last 90 days ·3 sellers, 0 buyers· 2 of 5 sales under Rule 10b5-1 plans· latest Form 4 filed Sep 23, 2026
Insider Buying
$0
reported purchases (SEC code P)
Insider Selling
$1.7M
reported sales (SEC code S)
Unique Insiders
4
in the rolling window
Latest filing
Sep 23, 2026
PETERS WILLIAM J
Amphastar Pharmaceuticals, Inc. (AMPH) has 33 SEC Form 4 filings (50 transaction rows) in the rolling window, disclosed by 4 distinct insiders. Most recent filing: Sep 23, 2026.
Inside the rolling window, 4 insiders at Amphastar Pharmaceuticals, Inc. reported no open-market purchases and 11 open-market sales totaling $1.7M. The most active filer is Director Petersen Floyd F. with 4 filings. Insiders have net sold $764K over the trailing 6 months. The most recent open-market filing is a sale of 4,139 shares by CFO, EVP & TREASURER PETERS WILLIAM J, dated Sep 21, 2026, worth $103K.
- Industry:Drug Manufacturers - Specialty & Generic
- CEO:Yongfeng Zhang
- Employees:1,976
- HQ:Rancho Cucamonga, CA, US
- IPO:2014-06-25
| Source | |||||||
|---|---|---|---|---|---|---|---|
| CFO, EVP & TREASURER | Sale | 4,139 | $103K | Sep 23 | +5.5% | SEC ↗ | |
| SENIOR EVP, PRODUCTION CENTER | Sale | 10,000 | $239K | Sep 17 | +10.5% | SEC ↗ | |
Zhou RongFirst in 9 months | SENIOR EVP, PRODUCTION CENTER | Sale | 3,187 | $75K | Sep 3 | +10.4% | SEC ↗ |
PRINS RICHARD KFirst in 9 months | Director | Sale | 7,973 | $162K | Aug 12 | +31.8% | SEC ↗ |
PETERS WILLIAM JFirst filing | CFO, EVP & TREASURER | Sale | 8,180 | $184K | Aug 11 | +28.9% | SEC ↗ |
Zhou RongFirst filing | SENIOR EVP, PRODUCTION CENTER | Sale | 9,787 | $256K | Dec 18 | -0.6% | SEC ↗ |
| Director | Sale | 1,737 | $45K | Dec 15 | +0.1% | SEC ↗ | |
| Director | Sale | 2,426 | $63K | Dec 15 | +0.1% | SEC ↗ | |
PRINS RICHARD KFirst filing | Director | Sale | 4,179 | $113K | Nov 25 | -4.9% | SEC ↗ |
| Director | Sale | 16,679 | $442K | Nov 17 | +1.2% | SEC ↗ | |
Petersen Floyd F.First filing | Director | Sale | 500 | $13K | Nov 5 | — | SEC ↗ |
Earnings: last 7 quarters
Frequently asked questions
How many SEC Form 4 insider filings does AMPH have?
Amphastar Pharmaceuticals, Inc. (AMPH) has 33 SEC Form 4 filings (50 transaction rows) in the rolling 365-day window, disclosed by 4 distinct insiders. Most recent filing: Sep 23, 2026.
When was the most recent SEC Form 4 filing for AMPH?
The most recent Form 4 filing for AMPH on Tracefour is dated Sep 23, 2026.
Who is the most active insider at AMPH?
The most active SEC Form 4 filer at AMPH in the rolling window is Director Petersen Floyd F., with 4 filings.
What is the net insider flow at AMPH over the last 6 months?
Over the trailing 180 days, insiders at AMPH have net sold $764K based on SEC Form 4 disclosures.
What is the total insider buy and sell value at AMPH in the current window?
Inside the rolling window, insiders at AMPH bought $0 and sold $1.7M based on SEC Form 4 filings.
Can I get alerts for AMPH insider trading?
Yes. Tracefour sends a free email when a new SEC Form 4 purchase or sale is filed at Amphastar Pharmaceuticals, Inc. (AMPH). Alerts are set per company from the page itself, there is no paid tier, and each email links to the original filing on SEC EDGAR.
Related companies
Amphastar Pharmaceuticals, Inc. is in the Healthcare sector.