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BLAIR WILLIAM & CO/IL: MPC position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of BLAIR WILLIAM & CO/IL on MPC, newest first. How the timeline and the estimate are built.

BLAIR WILLIAM & CO/IL held 43,095 MPC shares at 2026-06-30 per its 13F-HR filed 2026-08-11.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 43,095 shares
    Change vs previous 13F +1,963 shares

    0.03% of the 13F portfolio, value $11,018,152.

    13F-HR 0001104659-26-093821 filed by BLAIR WILLIAM & CO/IL
    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 41,132 shares
    Change vs previous 13F -13,217 shares

    0.03% of the 13F portfolio, value $10,043,727.

    13F-HR 0001104659-26-057897 filed by BLAIR WILLIAM & CO/IL
    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 54,349 shares
    Change vs previous 13F +10,039 shares

    0.02% of the 13F portfolio, value $8,838,758.

    13F-HR 0001104659-26-015563 filed by BLAIR WILLIAM & CO/IL
    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 44,310 shares
    Change vs previous 13F -1,096 shares

    0.02% of the 13F portfolio, value $8,540,221.

    13F-HR 0001104659-25-109927 filed by BLAIR WILLIAM & CO/IL
    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 45,406 shares
    Change vs previous 13F -4,763 shares

    0.02% of the 13F portfolio, value $7,542,401.

    13F-HR 0001104659-25-070274 filed by BLAIR WILLIAM & CO/IL
    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 50,169 shares
    Change vs previous 13F -2,982 shares

    0.02% of the 13F portfolio, value $7,309,190.

    13F-HR 0001104659-25-046545 filed by BLAIR WILLIAM & CO/IL
    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 53,151 shares
    Change vs previous 13F +4,908 shares

    0.02% of the 13F portfolio, value $7,414,609.

    13F-HR 0001104659-25-011872 filed by BLAIR WILLIAM & CO/IL
    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 48,243 shares
    Change vs previous 13F not available

    0.02% of the 13F portfolio, value $7,859,290.

    13F-HR 0001104659-24-116499 filed by BLAIR WILLIAM & CO/IL
    Filed (acceptance time not in the bulk data set), ingested

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