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Disclosery

STATE OF MICHIGAN RETIREMENT SYSTEM: BRK-B position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of STATE OF MICHIGAN RETIREMENT SYSTEM on BRK-B, newest first. How the timeline and the estimate are built.

STATE OF MICHIGAN RETIREMENT SYSTEM held 329,329 BRK-B shares at 2026-06-30 per its 13F-HR filed 2026-07-30.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 329,329 shares
    Change vs previous 13F -10,300 shares

    0.73% of the 13F portfolio, value $164,792,938.

    13F-HR 0000762152-26-000012 filed by STATE OF MICHIGAN RETIREMENT SYSTEM
    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 339,629 shares
    Change vs previous 13F -100 shares

    0.86% of the 13F portfolio, value $162,750,217.

    13F-HR 0000762152-26-000009 filed by STATE OF MICHIGAN RETIREMENT SYSTEM
    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 339,729 shares
    Change vs previous 13F -4,300 shares

    0.83% of the 13F portfolio, value $170,764,782.

    13F-HR 0000762152-26-000007 filed by STATE OF MICHIGAN RETIREMENT SYSTEM
    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 344,029 shares
    Change vs previous 13F -2,500 shares

    0.83% of the 13F portfolio, value $172,957,139.

    13F-HR 0000762152-25-000014 filed by STATE OF MICHIGAN RETIREMENT SYSTEM
    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 346,529 shares
    Change vs previous 13F +1,200 shares

    0.87% of the 13F portfolio, value $168,333,392.

    13F-HR 0000762152-25-000008 filed by STATE OF MICHIGAN RETIREMENT SYSTEM
    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 345,329 shares
    Change vs previous 13F +100 shares

    1.06% of the 13F portfolio, value $183,915,319.

    13F-HR 0000762152-25-000005 filed by STATE OF MICHIGAN RETIREMENT SYSTEM
    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 345,229 shares
    Change vs previous 13F -6,600 shares

    0.81% of the 13F portfolio, value $156,485,401.

    13F-HR 0000762152-25-000003 filed by STATE OF MICHIGAN RETIREMENT SYSTEM
    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 351,829 shares
    Change vs previous 13F not available

    0.8% of the 13F portfolio, value $161,932,816.

    13F-HR 0000762152-24-000013 filed by STATE OF MICHIGAN RETIREMENT SYSTEM
    Filed (acceptance time not in the bulk data set), ingested

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