What percent of CSTL is sold short?

50.8% of Castle (CSTL) trading volume was short last week. Track days-to-cover and borrow rate against insider and hedge fund flow.

Is CSTL a short squeeze candidate?

Compare short volume, days-to-cover, and borrow rate to insider buying — when insiders accumulate against heavy short interest, the squeeze setup gets stronger.

How is short volume different from short interest?

Short volume is daily shorting activity reported by FINRA; short interest is the bi-monthly snapshot of outstanding short positions. We track both for Castle (CSTL).

CSTL Short Volume Hit 50.8%

$35.56

+0.30 (+0.87%)

Weekly Expected Move ±5.0%

$32 $34 $36 $37 $39

NASDAQ · Healthcare · Medical - Diagnostics & Research · Tech Score Buy · Power 64 · $1.1B mcap · 27M float · 1.44% daily turnover · Short 45% of daily vol

Short Volume Summary

2026-10-01

67.9%

Short Ratio

of total volume

45.8%

20-Day Avg

46.4%

50-Day Avg

▲ Rising

5-Day Trend

0.1M

Short Volume

0.1M

Total Volume

Daily Short Volume Ratio

Short Volume vs Total Volume

Exchange Breakdown

2026-10-01

Exchange	Short Volume	Total Volume	Short %
NASDAQ	95,276	140,839	67.6%
NYSE	4,383	6,122	71.6%
BATS	307	366	83.9%

CSTL Short Interest

Short Volume Summary

Daily Short Volume Ratio

Short Volume vs Total Volume

Exchange Breakdown

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