Why is $CSTL stock down today?

Castle Biosciences, Inc. Common Stock · Services-Medical Laboratories

Why is $CSTL down today?

The likely driver

CASTLE BIOSCIENCES INC: Q2 FY2026 results, three months to Jun 30, 2026

SEC filing · Jul 30

The numbers behind the move

Short interest

6.2% of float

Days to cover

7.4d

Float

30.5M · Medium

Float rotation

0.0x

Price

$33.04

Move today

-1.0%

Volume vs avg

0.0x

Scanner alerts today

Flagged in 30 days

Market cap

$1.0B

Prev close

$33.36

Avg volume

404K

Nothing has triggered on CSTL yet in this session. Our scanner has flagged it 57 times in the last 30 days , most recently on October 6 for big percentage moves, unusual volume, which is why this page is here. See the full CSTL page for the chart and the alert history.

Full $CSTL page →Live chart Trending stocks

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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.