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Quantum Portfolio Management LLC: STX position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Quantum Portfolio Management LLC on STX, newest first. How the timeline and the estimate are built.

Quantum Portfolio Management LLC held 1,781 STX shares at 2026-06-30 per its 13F-HR filed 2026-08-14.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 1,781 shares
    Change vs previous 13F -334 shares

    0.62% of the 13F portfolio, value $1,718,665.

    13F-HR 0001420506-26-001701 filed by Quantum Portfolio Management 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/A 2,115 shares
    Change vs previous 13F +67 shares

    0.36% of the 13F portfolio, value $828,572.

    13F-HR/A 0001172661-26-001580 filed by Quantum Portfolio Management 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 2,048 shares
    Change vs previous 13F 0 shares

    0.25% of the 13F portfolio, value $563,999.

    13F-HR 0001172661-26-000672 filed by Quantum Portfolio Management 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 2,048 shares
    Change vs previous 13F not available

    0.14% of the 13F portfolio, value $483,451.

    13F-HR 0001172661-25-004476 filed by Quantum Portfolio Management LLC
    Filed (acceptance time not in the bulk data set), ingested

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