Over the past 12 months, 3 insiders at Amphastar Pharmaceuticals, Inc. filed 9 open-market SEC Form 4 transactions on AMPH: 0 purchases worth $0 and 9 sales worth $971K. Insiders have been net sellers over this period. The most recent filing was on Dec 17, 25.
| Date | Insider | Type | Shares | Price | Value |
|---|---|---|---|---|---|
| Dec 17, 25 | Rong ZhouSENIOR EVP, PRODUCTION CENTER | SELL | 9.8K | $26.20 | $256K |
| Dec 12, 25 | Floyd F. PetersenDirector | SELL | 2.4K | $25.92 | $63K |
| Dec 11, 25 | Floyd F. PetersenDirector | SELL | 1.7K | $25.69 | $45K |
| Nov 25, 25 | Richard K PrinsDirector | SELL | 4.2K | $27.10 | $113K |
| Nov 13, 25 | Floyd F. PetersenDirector | SELL | 16.7K | $26.49 | $442K |
| Nov 3, 25 | Floyd F. PetersenDirector | SELL | 500 | $25.27 | $13K |
| Oct 1, 25 | Floyd F. PetersenDirector | SELL | 500 | $27.20 | $14K |
| Sep 2, 25 | Floyd F. PetersenDirector | SELL | 500 | $30.98 | $15K |
| Aug 1, 25 | Floyd F. PetersenDirector | SELL | 500 | $20.83 | $10K |
| Jul 2, 25 | Floyd F. PetersenDirector | SELL | 500 | $23.47 | $12K |
| Jun 2, 25 | Floyd F. PetersenDirector | SELL | 500 | $25.67 | $13K |
| May 1, 25 | Floyd F. PetersenDirector | SELL | 500 | $24.08 | $12K |
| Apr 1, 25 | Floyd F. PetersenDirector | SELL | 500 | $28.38 | $14K |
| Mar 6, 25 | Floyd F. PetersenDirector | SELL | 1.0K | $27.99 | $28K |
| Mar 4, 25 | William J PetersCFO, EVP & TREASURER | SELL | 4.2K | $27.54 | $117K |
| Dec 13, 24 | Rong ZhouSENIOR EVP, PRODUCTION CENTER | SELL | 8.0K | $45.23 | $362K |
| Dec 12, 24 | Rong ZhouSENIOR EVP, PRODUCTION CENTER | SELL | 7.0K | $44.43 | $311K |
| Dec 9, 24 | Richard K PrinsDirector | SELL | 10.0K | $43.77 | $438K |
| Nov 12, 24 | Richard K PrinsDirector | SELL | 5.0K | $48.80 | $244K |
| Nov 12, 24 | Rong ZhouSENIOR EVP, PRODUCTION CENTER | SELL | 6.9K | $48.88 | $337K |
| Nov 6, 24 | Yakob LiawatidewiEVP CORP ADMIN CENTER | SELL | 5.2K | $52.05 | $271K |
| Nov 6, 24 | William J PetersCFO, EVP & TREASURER | SELL | 7.4K | $52.05 | $387K |
| Sep 13, 24 | Rong ZhouSENIOR EVP, PRODUCTION CENTER | SELL | 3.0K | $48.26 | $145K |
| Sep 5, 24 | Floyd F. PetersenDirector | SELL | 3.0K | $46.47 | $139K |
| Aug 26, 24 | Rong ZhouSENIOR EVP, PRODUCTION CENTER | SELL | 4.0K | $48.35 | $193K |
| Aug 12, 24 | Richard K PrinsDirector | SELL | 17.1K | $43.07 | $737K |
| Jul 31, 24 | William J PetersCFO, EVP & TREASURER | SELL | 10.3K | $44.23 | $455K |
| Jun 27, 24 | William J PetersCFO, EVP & TREASURER | SELL | 3.0K | $41.29 | $121K |
| Jun 10, 24 | Floyd F. PetersenDirector | SELL | 3.0K | $41.40 | $124K |
| Jun 3, 24 | Floyd F. PetersenDirector | SELL | 500 | $42.65 | $21K |
| May 1, 24 | Floyd F. PetersenDirector | SELL | 500 | $41.67 | $21K |
| Apr 1, 24 | Floyd F. PetersenDirector | SELL | 500 | $43.43 | $22K |
| Mar 6, 24 | William J PetersCFO, EVP & TREASURER | SELL | 13.4K | $48.00 | $621K |
| Mar 5, 24 | Michael A ZasloffDirector | SELL | 9.4K | $47.53 | $442K |
| Mar 1, 24 | Floyd F. PetersenDirector | SELL | 451 | $46.53 | $21K |
| Feb 1, 24 | Floyd F. PetersenDirector | SELL | 474 | $53.64 | $25K |
| Jan 10, 24 | Jack Y. ZhangCEO & Chief Scientific Officer | SELL | 78.2K | $57.00 | $4.2M |
| Jan 9, 24 | Mary Z. LuoCOO,Chief Scientist & Chairman | SELL | 50.7K | $58.35 | $2.9M |
| Jan 8, 24 | Mary Z. LuoCOO,Chief Scientist & Chairman | SELL | 41.3K | $63.27 | $2.4M |
| Jan 2, 24 | Floyd F. PetersenDirector | SELL | 353 | $61.70 | $22K |
| Dec 4, 23 | Rong ZhouSenior EVP, Production Center | SELL | 3.5K | $59.58 | $209K |
| Dec 1, 23 | Floyd F. PetersenDirector | SELL | 365 | $58.15 | $21K |
| Dec 1, 23 | Rong ZhouSenior EVP, Production Center | SELL | 4.3K | $58.58 | $253K |
| Nov 17, 23 | Richard K PrinsDirector | SELL | 4.0K | $55.86 | $223K |
| Nov 14, 23 | Gayle DeflinDirector | SELL | 4.2K | $55.45 | $231K |
| Nov 14, 23 | William J PetersCFO, EVP & Treasurer | SELL | 30.2K | $56.53 | $1.7M |
| Nov 13, 23 | Richard K PrinsDirector | SELL | 5.0K | $52.50 | $263K |
| Nov 1, 23 | Floyd F. PetersenDirector | SELL | 500 | $45.30 | $23K |
| Oct 2, 23 | Floyd F. PetersenDirector | SELL | 500 | $45.78 | $23K |
| Sep 6, 23 | William J PetersCFO, EVP & Treasurer | SELL | 60.7K | $52.26 | $3.1M |
Over the past 12 months, insiders at Amphastar Pharmaceuticals, Inc. filed 0 open-market purchases worth $0 and 9 sales worth $971K on AMPH, which makes them net sellers over the period. The most recent Form 4 was filed on Dec 17, 25.
3 different insiders at Amphastar Pharmaceuticals, Inc. filed open-market SEC Form 4 transactions on AMPH over the last 12 months.
InsiderTape plots every AMPH insider buy and sell directly on the price chart and flags new SEC Form 4 filings as they arrive, with cluster detection and buy/sell pressure. The data updates daily from SEC EDGAR.
InsiderTape plots every Amphastar Pharmaceuticals, Inc. insider buy and sell on the price chart, with buy/sell pressure, cluster detection, and alerts the moment new Form 4s hit. Start a free 7-day trial, cancel anytime.
Does it work? In five years of data, insider clusters beat the Russell 2000 about 60% of the time and the CFO's buy was the sharpest signal of all. See the backtest →
START FREE TRIAL →