BIIB Short Interest
Biogen Inc.
1W: +8.0%
1M: +10.8%
3M: +22.7%
YTD: +41.9%
1Y: +68.1%
3Y: -2.0%
5Y: -6.5%
$252.73
+0.47 (+0.19%)
After Hours: $252.04 (-0.69, -0.27%)
Weekly Expected Move ±4.4%
$229
$240
$251
$262
$273
Credit Risk of going bust: lower than 68% of companies Debt: 18.3% of company value Bonds: $137.0M held by 192 funds, 91 bp over Treasuries → details ▾
Of US companies ranked in the safest four tenths, about 1 in 3,500 filed for bankruptcy within a year (2020-2025).
If the stock fell to about $4.22 (down 98%), Biogen Inc. would be worth roughly what it owes.
Total debt $8.36B against a stock market value of $37.27B.
Distance to default 7.34 (Merton model): prices to 2026-10-26, balance sheet 2026-06-30, debt counted $4.45B (short-term plus half of long-term), stock volatility 33.9%; Altman Z 3.16. A ranking and a back-test, not a forecast.
Bond figures are fund-reported marks (SEC N-PORT) as of Jul 2026. How these are computed.
If the stock fell to about $4.22 (down 98%), Biogen Inc. would be worth roughly what it owes.
Total debt $8.36B against a stock market value of $37.27B.
Distance to default 7.34 (Merton model): prices to 2026-10-26, balance sheet 2026-06-30, debt counted $4.45B (short-term plus half of long-term), stock volatility 33.9%; Altman Z 3.16. A ranking and a back-test, not a forecast.
Bond figures are fund-reported marks (SEC N-PORT) as of Jul 2026. How these are computed.
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Short Volume Summary
2026-10-2673.0%
Short Ratio
of total volume
62.1%
20-Day Avg
62.4%
50-Day Avg
▼ Falling
5-Day Trend
0.3M
Short Volume
0.4M
Total Volume
Daily Short Volume Ratio
Short Volume vs Total Volume
Exchange Breakdown
2026-10-26| Exchange | Short Volume | Total Volume | Short % |
|---|---|---|---|
| NASDAQ | 246,356 | 339,499 | 72.6% |
| NYSE | 8,192 | 9,884 | 82.9% |
| BATS | 3,153 | 3,582 | 88.0% |