Why is CSTL stock up today?

Castle Biosciences, Inc. Common Stock (CSTL) is up 0.0% today. Our scanner flagged it 7 times today on unusual volume. A recent SEC filing (CASTLE BIOSCIENCES INC: Q2 FY2026 results, three months to Jun 30, 2026) may be a factor. Volume is running about 0.0x its recent daily average.

Why is $CSTL stock moving today?

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

Why is $CSTL moving 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

6.5% of float

Days to cover

5.0d

Float

30.5M · Medium

Float rotation

0.0x

Price

$34.99

Move today

+0.0%

Volume vs avg

0.0x

Scanner alerts today

Flagged in 30 days

Market cap

$1.1B

Prev close

$34.99

Avg volume

397K

Today’s scanner timeline

3:15 PMUnusual volume (RVOL) alert
2:20 PMUnusual volume (RVOL) alert
12:56 PMUnusual volume (RVOL) alert
12:54 PMBig % mover alert
12:23 PMBig % mover alert
10:57 AMBig % mover alert
10:51 AMUnusual volume (RVOL) alert

Unusual-volume alerts often fire before the news is widely reported. This is when our scanner first flagged CSTL today.

Full $CSTL page →Live chart Trending stocks

Other stocks moving today

$ISOU -11.1%$MNDR -11.1%$FIAT -10.2%$GOSS -10.1%$NGEN -9.7%$INDP -9.7%$PMI -9.3%$WETO -9.1%

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.