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Disclosery

Asset Management One Co., Ltd.: BRK-B position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Asset Management One Co., Ltd. on BRK-B, newest first. How the timeline and the estimate are built.

Asset Management One Co., Ltd. held 619,590 BRK-B 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 619,590 shares
    Change vs previous 13F +27,197 shares

    0.8% of the 13F portfolio, value $310,036,640.

    13F-HR 0001193125-26-318819 filed by Asset Management One Co., Ltd.
    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 592,393 shares
    Change vs previous 13F -3,497 shares

    0.84% of the 13F portfolio, value $283,874,726.

    13F-HR 0001193125-26-213217 filed by Asset Management One Co., Ltd.
    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 595,890 shares
    Change vs previous 13F +9,227 shares

    0.83% of the 13F portfolio, value $298,586,424.

    13F-HR 0001193125-26-023286 filed by Asset Management One Co., Ltd.
    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 586,663 shares
    Change vs previous 13F +10,675 shares

    0.85% of the 13F portfolio, value $294,938,957.

    13F-HR 0001193125-25-245770 filed by Asset Management One Co., Ltd.
    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 575,988 shares
    Change vs previous 13F +9,668 shares

    0.88% of the 13F portfolio, value $279,797,691.

    13F-HR 0000950123-25-006830 filed by Asset Management One Co., Ltd.
    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 566,320 shares
    Change vs previous 13F +38,493 shares

    1.04% of the 13F portfolio, value $301,610,706.

    13F-HR 0000950123-25-003633 filed by Asset Management One Co., Ltd.
    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 527,827 shares
    Change vs previous 13F +7,627 shares

    0.83% of the 13F portfolio, value $240,958,304.

    13F-HR 0000950123-25-000714 filed by Asset Management One Co., Ltd.
    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 520,200 shares
    Change vs previous 13F not available

    0.85% of the 13F portfolio, value $239,427,252.

    13F-HR 0000950123-24-010027 filed by Asset Management One Co., Ltd.
    Filed (acceptance time not in the bulk data set), ingested

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