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SPMB · State Street(R) SPDR(R) Portfolio Mortgage Backed Bond ETF · Short Interest ETF

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$21.36 +0.00 (+0.00%) At close · Oct 21
Volume · Oct 21 1.85M Avg daily vol (3M) 1.66M

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 →

SPMB Latest Reported Short Interest

FINRA reported 409,493 SPMB shares sold short as of the September 30, 2026 settlement date, a decrease of 7,066 shares. Days to cover was 1.00 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
    		 — — — —
    2026-09-30 409,493 416,559 -7,066 1.00
    2026-09-15 416,559 240,258 +176,301 1.00
    2026-08-31 240,258 384,061 -143,803 1.00
    2026-08-14 384,061 895,869 -511,808 1.00
    2026-07-31 895,869 248,013 +647,856 1.00
    2026-07-15 248,013 499,297 -251,284 1.00
    2026-06-30 499,297 219,590 +279,707 1.00
    2026-06-15 219,590 622,852 -403,262 1.00
    2026-05-29 622,852 613,688 +9,164 1.00
    2026-05-15 613,688 844,136 -230,448 1.00
    2026-04-30 844,136 1,144,020 -299,884 1.00
    2026-04-15 1,144,020 451,507 +692,513 1.47
    2026-03-31 451,507 675,935 -224,428 1.00
    2026-03-13 675,935 568,323 +107,612 1.00
    2026-02-27 568,323 239,312 +329,011 1.00
    2026-02-13 239,312 464,560 -225,248 1.00
    2026-01-30 464,560 602,464 -137,904 1.00
    2026-01-15 602,464 491,759 +110,705 1.00
    2025-12-31 491,759 808,661 -316,902 1.00
    2025-12-15 808,661 737,945 +70,716 1.17
    2025-11-28 737,945 607,555 +130,390 1.00
    2025-11-14 607,555 928,567 -321,012 1.00
    2025-10-31 928,567 438,699 +489,868 1.00

    Full FINRA short interest reporting calendar

    Showing 1–23 of 23 settlements