Why is $AMPH stock down today?
Amphastar Pharmaceuticals, Inc. · Pharmaceutical Preparations
Why is $AMPH down today?
The likely driver
Amphastar Pharmaceuticals, Inc.: Q2 FY2026 results, three months to Jun 30, 2026
Amphastar Pharmaceuticals, Inc.: Q2 FY2026 results, three months to Jun 30, 2026
SEC filing · Aug 6
The numbers behind the move
Short interest
46.3% of float
Days to cover
15.4d
Float
11.1M · Medium
Float rotation
0.1x
AMPH: 46.3% of the float is sold short (15.4 days to cover).
Price
$23.12
Move today
-2.1%
Volume vs avg
0.0x
Scanner alerts today
0
Flagged in 30 days
49
Market cap
$1.0B
Prev close
$23.62
Avg volume
466K
Nothing has triggered on AMPH yet in this session. Our scanner has flagged it 49 times in the last 30 days , most recently on September 15 for big percentage moves, unusual volume, which is why this page is here. See the full AMPH page for the chart and the alert history.
Other stocks moving today
Each opens that stock’s own why-is-it-moving page.
Move and volume are based on the latest market data and refresh live on this page. Scanner alerts are our own real-time unusual-volume signals. This is research, not investment advice.