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Quantum Portfolio Management LLC: MKSI position timeline

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

Quantum Portfolio Management LLC held 2,295 MKSI 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 2,295 shares
    Change vs previous 13F +901 shares

    0.37% of the 13F portfolio, value $1,020,816.

    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 1,394 shares
    Change vs previous 13F -1,494 shares

    0.14% of the 13F portfolio, value $320,355.

    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 2,888 shares
    Change vs previous 13F -1,873 shares

    0.2% of the 13F portfolio, value $461,502.

    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 4,761 shares
    Change vs previous 13F not available

    0.18% of the 13F portfolio, value $589,269.

    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).