RZ
Rong Zhou (SENIOR EVP, PRODUCTION CENTER) 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 $256K of AMPH (9,787 sh × $26.20, as filed), executed Dec 17 2025. Data as of Nov 8 2026.
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
–
measured on stock purchases
Volume, ttmiDollar value disclosed in the trailing twelve months
$496K
shares × price, as filed
Last traded
Sep 16
Filed Sep 17
Median ADV $12.0M across their filed names
Open performance→Volume by month
Buys $0
Sells $1.2M
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 →
$239K10,000 sh × $23.94
Exec Sep 16
Filed Sep 17 · 6:19 PM ET AMPHSALE Amphastar Pharmaceuticals, Inc. View filing → $256K
9,787 sh × $26.20
Exec Dec 17 2025
Filed Dec 18 2025 · 5:30 PM ET AMPHSALE Amphastar Pharmaceuticals, Inc. View filing → $673K
15,000 sh across 2 lots
Exec Dec 12 2024
Filed Dec 16 2024 · 5:30 PM ET AMPHSALE Amphastar Pharmaceuticals, Inc. View filing → $337K
6,893 sh × $48.88
Exec Nov 12 2024
Filed Nov 13 2024 · 5:30 PM ET