RP
Insider
Richard K Prins
DirectorRichard K Prins (Director) filed 2 Form 4 reports in the trailing twelve months (0 purchases, 2 sales), most often in Amphastar Pharmaceuticals, Inc. (AMPH). The largest single filing was $162K of AMPH (7,973 sh × $20.30, as filed), executed Aug 11.
Add to watchlistReturn, ttmiAverage return per filing, trailing twelve months
–
no purchases on file
Delay-adjustediThe same average, entered at disclosure dates
–
returns measure stock purchases only
Filings, ttm
2
0 buys · 2 sells
Median delay
–
execution → disclosure
Volume, ttmiDollar value disclosed in the trailing twelve months
$275K
shares × price, as filed
Last traded
Aug 11
Filed Aug 12
Median ADV $12.0M across their filed names
Open performance→Volume by month
Buys $0
Sells $957K
Shares × price, as filed · by filing month · past 24 months
Sectors filed on
Healthcare
2 filings
Sector per market data · by filing · past 12 months
Most traded names
AMPH
Amphastar Pharmaceuticals, Inc.
AMPH · 0 buys · 4 sells
4 filings
Recent filings
AMPHSALE
Amphastar Pharmaceuticals, Inc.
View filing →
$162K7,973 sh × $20.30
Exec Aug 11
Filed Aug 12 · 6:14 PM ET AMPHSALE Amphastar Pharmaceuticals, Inc. View filing → $113K
4,179 sh × $27.10
Exec Nov 25 2025
Filed Nov 25 2025 · 5:30 PM ET AMPHSALE Amphastar Pharmaceuticals, Inc. View filing → $438K
10,000 sh × $43.77
Exec Dec 9 2024
Filed Dec 11 2024 · 5:30 PM ET AMPHSALE Amphastar Pharmaceuticals, Inc. View filing → $244K
5,000 sh × $48.80
Exec Nov 12 2024
Filed Nov 13 2024 · 5:30 PM ET