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IBB · iShares Biotechnology ETF · Short Interest ETF

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$207.74 -1.80 (-0.86%) At close · Oct 23
Volume · Oct 23 830.81K Avg daily vol (3M) 1.58M

Shares sold short and not yet covered, reported twice monthly. Days to cover is the reported short position divided by average daily volume.

Pull short interest history through the short interest API or MCP →

IBB Latest Reported Short Interest

FINRA reported 11,555,499 IBB shares sold short as of the September 30, 2026 settlement date, a decrease of 711,671 shares. Days to cover was 8.00 based on FINRA's reported average daily volume.

Official FINRA short-interest data · share counts are restated for subsequent splits of this listing

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    • Short Interest History

    Settlement Date Current Position Previous Position Change Days to Cover
    2026-10-30 Scheduled
    FINRA publishes Nov 10
    		 — — — —
    2026-10-15 Scheduled
    FINRA publishes Oct 26
    		 — — — —
    2026-09-30 11,555,499 12,267,170 -711,671 8.00
    2026-09-15 12,267,170 10,985,379 +1,281,791 7.85
    2026-08-31 10,985,379 10,440,435 +544,944 6.63
    2026-08-14 10,440,435 10,042,470 +397,965 7.36
    2026-07-31 10,042,470 11,909,708 -1,867,238 7.06
    2026-07-15 11,909,708 12,108,341 -198,633 6.42
    2026-06-30 12,108,341 12,435,411 -327,070 7.08
    2026-06-15 12,435,411 13,243,596 -808,185 8.73
    2026-05-29 13,243,596 13,009,363 +234,233 8.78
    2026-05-15 13,009,363 13,267,269 -257,906 9.67
    2026-04-30 13,267,269 12,584,040 +683,229 9.08
    2026-04-15 12,584,040 13,298,650 -714,610 9.39
    2026-03-31 13,298,650 14,315,391 -1,016,741 7.84
    2026-03-13 14,315,391 14,892,958 -577,567 7.65
    2026-02-27 14,892,958 15,059,984 -167,026 9.32
    2026-02-13 15,059,984 12,721,468 +2,338,516 6.94
    2026-01-30 12,721,468 12,700,561 +20,907 7.48
    2026-01-15 12,700,561 12,595,742 +104,819 6.17
    2025-12-31 12,595,742 13,378,601 -782,859 8.52
    2025-12-15 13,378,601 12,218,668 +1,159,933 8.09
    2025-11-28 12,218,668 12,364,326 -145,658 4.09
    2025-11-14 12,364,326 11,794,089 +570,237 4.81
    2025-10-31 11,794,089 11,702,478 +91,611 6.03

    Full FINRA short interest reporting calendar

    Showing 1–23 of 23 settlements