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Bronte Capital Management Pty Ltd.: IBKR position timeline

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

Bronte Capital Management Pty Ltd. held 883,526 IBKR 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 883,526 shares
    Change vs previous 13F -398,205 shares

    8.66% of the 13F portfolio, value $76,902,103.

    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 1,281,731 shares
    Change vs previous 13F -204,563 shares

    9.14% of the 13F portfolio, value $85,965,698.

    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 1,486,294 shares
    Change vs previous 13F -274,877 shares

    9.99% of the 13F portfolio, value $95,583,567.

    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 1,761,171 shares
    Change vs previous 13F -643,478 shares

    12.19% of the 13F portfolio, value $135,428,337.

    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 2,404,649 shares
    Change vs previous 13F +1,878,065 shares

    11.79% of the 13F portfolio, value $150,084,437.

    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 526,584 shares
    Change vs previous 13F -68,460 shares

    8.29% of the 13F portfolio, value $102,062,326.

    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 595,044 shares
    Change vs previous 13F -238,583 shares

    9.73% of the 13F portfolio, value $123,281,412.

    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 833,627 shares
    Change vs previous 13F not available

    9.44% of the 13F portfolio, value $116,174,259.

    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).