What percent of BIIB is sold short?

50.9% of Biogen (BIIB) trading volume was short last week. Track days-to-cover and borrow rate against insider and hedge fund flow.

Is BIIB 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 Biogen (BIIB).

BIIB Short Volume Hit 50.9%

Also trades as: 0R1B.L (LSE) · $vol 0M · IDP.DE (XETRA) · $vol 0M · BIIB.SW (SIX)

$193.76

+4.29 (+2.26%)

Weekly Expected Move ±5.8%

$171 $182 $193 $204 $215

NASDAQ · Healthcare · Drug Manufacturers - General · Alpha Radar Buy · Power 58 · $28.6B mcap · 146M float · 0.786% daily turnover · Short 62% of daily vol

Short Volume Summary

2026-05-21

24.4%

Short Ratio

of total volume

63.9%

20-Day Avg

60.6%

50-Day Avg

▼ Falling

5-Day Trend

0.2M

Short Volume

0.9M

Total Volume

Daily Short Volume Ratio

Short Volume vs Total Volume

Exchange Breakdown

2026-05-21

Exchange	Short Volume	Total Volume	Short %
NASDAQ	198,492	842,838	23.6%
NYSE	9,385	11,698	80.2%
BATS	751	1,276	58.9%

BIIB NASDAQ

Short Volume Summary

Daily Short Volume Ratio

Short Volume vs Total Volume

Exchange Breakdown

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