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Polaris Capital Management, LLC: MPC position timeline

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

Polaris Capital Management, LLC held 93,482 MPC shares at 2026-06-30 per its 13F-HR filed 2026-07-27.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 93,482 shares
    Change vs previous 13F -62,350 shares

    2.25% of the 13F portfolio, value $23,900,543.

    13F-HR 0001144969-26-000005 filed by Polaris Capital 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 155,832 shares
    Change vs previous 13F -8,100 shares

    3.11% of the 13F portfolio, value $38,051,058.

    13F-HR 0001144969-26-000004 filed by Polaris Capital 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 163,932 shares
    Change vs previous 13F -30,400 shares

    2.21% of the 13F portfolio, value $26,660,261.

    13F-HR 0001144969-26-000002 filed by Polaris Capital 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 194,332 shares
    Change vs previous 13F +16,500 shares

    2.46% of the 13F portfolio, value $37,455,550.

    13F-HR 0001144969-25-000010 filed by Polaris Capital 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 177,832 shares
    Change vs previous 13F -9,700 shares

    1.97% of the 13F portfolio, value $29,539,674.

    13F-HR 0001144969-25-000005 filed by Polaris Capital 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 187,532 shares
    Change vs previous 13F -23,462 shares

    1.56% of the 13F portfolio, value $27,321,537.

    13F-HR 0001144969-25-000004 filed by Polaris Capital Management, 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 210,994 shares
    Change vs previous 13F -500 shares

    1.42% of the 13F portfolio, value $29,433,663.

    13F-HR 0001144969-25-000001 filed by Polaris Capital Management, 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 211,494 shares
    Change vs previous 13F not available

    1.7% of the 13F portfolio, value $34,454,488.

    13F-HR 0001144969-24-000011 filed by Polaris Capital Management, LLC
    Filed (acceptance time not in the bulk data set), ingested

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