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Quantum Portfolio Management LLC: GPK position timeline

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

Quantum Portfolio Management LLC held 11,157 GPK 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 11,157 shares
    Change vs previous 13F -6,733 shares

    0.04% of the 13F portfolio, value $117,929.

    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 17,890 shares
    Change vs previous 13F +1,010 shares

    0.08% of the 13F portfolio, value $177,827.

    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 16,880 shares
    Change vs previous 13F +1,269 shares

    0.11% of the 13F portfolio, value $254,213.

    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 15,611 shares
    Change vs previous 13F +800 shares

    0.09% of the 13F portfolio, value $305,507.

    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).

  5. period ended2025-06-30
    13F 14,811 shares
    Change vs previous 13F +4,735 shares

    0.15% of the 13F portfolio, value $312,068.

    13F-HR 0001172661-25-003208 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).

  6. period ended2025-03-31
    13F 10,076 shares
    Change vs previous 13F not available

    0.13% of the 13F portfolio, value $261,573.

    13F-HR 0001172661-25-001852 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).