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Bronte Capital Management Pty Ltd.: BRK-B position timeline

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

Bronte Capital Management Pty Ltd. held 145,847 BRK-B shares at 2026-06-30 per its 13F-HR filed 2026-08-05.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 145,847 shares
    Change vs previous 13F -9,216 shares

    8.22% of the 13F portfolio, value $72,980,380.

    13F-HR 0001471085-26-000004 filed by Bronte Capital Management Pty 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 155,063 shares
    Change vs previous 13F -7,264 shares

    7.9% of the 13F portfolio, value $74,306,190.

    13F-HR 0001471085-26-000002 filed by Bronte Capital Management Pty 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 162,327 shares
    Change vs previous 13F -12,401 shares

    8.53% of the 13F portfolio, value $81,593,667.

    13F-HR 0001471085-26-000001 filed by Bronte Capital Management Pty 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 174,728 shares
    Change vs previous 13F -45,576 shares

    8.84% of the 13F portfolio, value $98,166,318.

    13F-HR 0001471085-25-000008 filed by Bronte Capital Management Pty 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 220,304 shares
    Change vs previous 13F +2,274 shares

    9.48% of the 13F portfolio, value $120,719,513.

    13F-HR 0001471085-25-000005 filed by Bronte Capital Management Pty 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 218,030 shares
    Change vs previous 13F -1,805 shares

    11.03% of the 13F portfolio, value $135,829,382.

    13F-HR 0001471085-25-000003 filed by Bronte Capital Management Pty 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 219,835 shares
    Change vs previous 13F -111,419 shares

    9.22% of the 13F portfolio, value $116,841,762.

    13F-HR 0001471085-25-000001 filed by Bronte Capital Management Pty 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 331,254 shares
    Change vs previous 13F not available

    12.39% of the 13F portfolio, value $152,462,966.

    13F-HR 0001471085-24-000014 filed by Bronte Capital Management Pty Ltd.
    Filed (acceptance time not in the bulk data set), ingested

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