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SIMPLEX TRADING, LLC: QSI position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of SIMPLEX TRADING, LLC on QSI, newest first. How the timeline and the estimate are built.

SIMPLEX TRADING, LLC held 165,293 QSI shares at 2026-06-30 per its 13F-HR filed 2026-08-12.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 165,293 shares
    Change vs previous 13F +74,762 shares

    <0.01% of the 13F portfolio, value $146,284.

    13F-HR 0001488542-26-000011 filed by SIMPLEX TRADING, LLC
    Filed (acceptance time not in the bulk data set), ingested

    Acceptance time not in the bulk data set (spec §4.2).

  2. period ended2026-03-31
    13F 90,531 shares
    Change vs previous 13F +10,024 shares

    <0.01% of the 13F portfolio, value $70,070.

    13F-HR 0001488542-26-000009 filed by SIMPLEX TRADING, LLC
    Filed (acceptance time not in the bulk data set), ingested

    Acceptance time not in the bulk data set (spec §4.2).

  3. period ended2025-12-31
    13F 80,507 shares
    Change vs previous 13F -73,576 shares

    <0.01% of the 13F portfolio, value $88,557.

    13F-HR 0001488542-26-000002 filed by SIMPLEX TRADING, LLC
    Filed (acceptance time not in the bulk data set), ingested

    Acceptance time not in the bulk data set (spec §4.2).

  4. period ended2025-09-30
    13F 154,083 shares
    Change vs previous 13F +48,549 shares

    <0.01% of the 13F portfolio, value $217,000.

    13F-HR 0001488542-25-000018 filed by SIMPLEX TRADING, LLC
    Filed (acceptance time not in the bulk data set), ingested

    Acceptance time not in the bulk data set (spec §4.2).

  5. period ended2025-06-30
    13F 105,534 shares
    Change vs previous 13F +62,625 shares

    0.01% of the 13F portfolio, value $206,000.

    13F-HR 0001488542-25-000010 filed by SIMPLEX TRADING, LLC
    Filed (acceptance time not in the bulk data set), ingested

    Acceptance time not in the bulk data set (spec §4.2).

  6. period ended2025-03-31
    13F 42,909 shares
    Change vs previous 13F -263,860 shares

    <0.01% of the 13F portfolio, value $51,000.

    13F-HR 0001488542-25-000007 filed by SIMPLEX TRADING, LLC
    Filed (acceptance time not in the bulk data set), ingested

    Acceptance time not in the bulk data set (spec §4.2).

  7. period ended2024-12-31
    13F 306,769 shares
    Change vs previous 13F +280,270 shares

    0.02% of the 13F portfolio, value $828,000.

    13F-HR 0001488542-25-000001 filed by SIMPLEX TRADING, LLC
    Filed (acceptance time not in the bulk data set), ingested

    Acceptance time not in the bulk data set (spec §4.2).

  8. period ended2024-09-30
    13F 26,499 shares
    Change vs previous 13F not available

    <0.01% of the 13F portfolio, value $23,000.

    13F-HR 0001488542-24-000015 filed by SIMPLEX TRADING, LLC
    Filed (acceptance time not in the bulk data set), ingested

    Acceptance time not in the bulk data set (spec §4.2).