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Disclosery

Heronetta Management, L.P.: MPLX position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Heronetta Management, L.P. on MPLX, newest first. How the timeline and the estimate are built.

Heronetta Management, L.P. held 324,039 MPLX shares at 2026-06-30 per its 13F-HR filed 2026-07-28.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 324,039 shares
    Change vs previous 13F 0 shares

    16.76% of the 13F portfolio, value $18,253,117.

    13F-HR 0000922423-26-000018 filed by Heronetta Management, L.P.
    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 324,039 shares
    Change vs previous 13F +400 shares

    16.88% of the 13F portfolio, value $18,492,906.

    13F-HR 0000922423-26-000014 filed by Heronetta Management, L.P.
    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 323,639 shares
    Change vs previous 13F -32,425 shares

    9.99% of the 13F portfolio, value $17,272,613.

    13F-HR 0000922423-26-000012 filed by Heronetta Management, L.P.
    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 356,064 shares
    Change vs previous 13F 0 shares

    9.74% of the 13F portfolio, value $17,785,397.

    13F-HR 0000922423-25-000048 filed by Heronetta Management, L.P.
    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 356,064 shares
    Change vs previous 13F 0 shares

    10.22% of the 13F portfolio, value $18,340,857.

    13F-HR 0001140361-25-028999 filed by Heronetta Management, L.P.
    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 356,064 shares
    Change vs previous 13F +500 shares

    10.41% of the 13F portfolio, value $19,056,545.

    13F-HR 0000922423-25-000035 filed by Heronetta Management, L.P.
    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 355,564 shares
    Change vs previous 13F -2,800 shares

    9.72% of the 13F portfolio, value $17,017,293.

    13F-HR 0000922423-25-000016 filed by Heronetta Management, L.P.
    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 358,364 shares
    Change vs previous 13F not available

    9.74% of the 13F portfolio, value $15,932,863.

    13F-HR 0000922423-24-000071 filed by Heronetta Management, L.P.
    Filed (acceptance time not in the bulk data set), ingested

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