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BIIB · Biogen Inc. · Short Volume

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$243.10 +9.62 (+4.12%) At close · Oct 20
S&P 500 member Russell 1000 member Rebalance outlook locked
Market Cap
$35.75B
Shares
147.64M
Volume · Oct 20 1.49M Avg daily vol (3M) 1.01M

Daily short-sale volume published by FINRA from its trade-reporting facilities. It measures how many shares were sold short each day as a share of total volume — a daily flow, not the total outstanding short position.

Pull daily short volume through the short interest API or MCP →
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    • Short Volume

    Date Short Volume Short Exempt Total Volume Short %
    2026-10-20 446,578 0 635,170 70.3%
    2026-10-19 225,594 0 356,957 63.2%
    2026-10-16 423,756 0 546,778 77.5%
    2026-10-15 451,045 365 576,664 78.2%
    2026-10-14 452,487 0 670,781 67.5%
    2026-10-13 277,062 100 383,698 72.2%
    2026-10-12 354,549 239 690,332 51.4%
    2026-10-09 182,556 362 348,775 52.3%
    2026-10-08 218,666 0 478,221 45.7%
    2026-10-07 278,272 14 528,154 52.7%
    2026-10-06 298,059 0 425,703 70.0%
    2026-10-05 223,179 0 407,863 54.7%
    2026-10-02 202,352 0 303,895 66.6%
    2026-10-01 380,080 0 747,360 50.9%
    2026-09-30 273,434 125 763,136 35.8%
    2026-09-29 245,687 1 470,627 52.2%
    2026-09-28 315,068 0 501,596 62.8%
    2026-09-25 228,211 301 301,342 75.7%
    2026-09-24 256,289 46 374,069 68.5%
    2026-09-23 337,873 10 486,863 69.4%
    2026-09-22 252,375 69 401,552 62.8%
    2026-09-21 201,429 0 334,416 60.2%
    2026-09-18 206,013 0 281,507 73.2%
    2026-09-17 110,876 190 245,597 45.1%
    2026-09-16 117,789 734 197,638 59.6%
    2026-09-15 161,470 284 284,081 56.8%
    2026-09-14 142,884 1 228,501 62.5%
    2026-09-11 288,634 0 469,844 61.4%
    2026-09-10 263,536 0 405,751 65.0%
    2026-09-09 141,422 360 261,781 54.0%
    2026-09-08 169,248 305 240,263 70.4%
    2026-09-04 136,129 0 204,055 66.7%
    2026-09-03 140,319 92 190,206 73.8%
    2026-09-02 297,120 20 482,277 61.6%
    2026-09-01 164,826 248 270,605 60.9%
    2026-08-31 133,701 12 221,231 60.4%
    2026-08-28 120,406 1 170,843 70.5%
    2026-08-27 137,221 40 182,711 75.1%
    2026-08-26 207,337 0 254,815 81.4%
    2026-08-25 127,646 96 214,867 59.4%
    2026-08-24 118,602 27 220,221 53.9%
    2026-08-21 128,332 600 262,528 48.9%
    2026-08-20 150,804 1 307,969 49.0%
    2026-08-19 143,202 0 279,202 51.3%
    2026-08-18 170,957 0 287,245 59.5%
    2026-08-17 130,239 406 224,826 57.9%
    2026-08-14 111,700 0 187,952 59.4%
    2026-08-13 176,913 1 327,651 54.0%
    2026-08-12 178,874 101 293,644 60.9%
    2026-08-11 183,210 310 362,621 50.5%
    Showing 1–50 of 65 days
    Key facts CIK 875045 CUSIP 09062X103 13F (30d) 190 filings 175 filers Visit website Investor relations