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Disclosery

Aquamarine Zurich AG: BRK-B position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Aquamarine Zurich AG on BRK-B, newest first. How the timeline and the estimate are built.

Aquamarine Zurich AG held 97,600 BRK-B shares at 2026-06-30 per its 13F-HR filed 2026-07-10.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 97,600 shares
    Change vs previous 13F 0 shares

    33.89% of the 13F portfolio, value $48,838,000.

    13F-HR 0001953324-26-000003 filed by Aquamarine Zurich AG
    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 97,600 shares
    Change vs previous 13F 0 shares

    34.57% of the 13F portfolio, value $46,770,000.

    13F-HR 0001953324-26-000002 filed by Aquamarine Zurich AG
    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 97,600 shares
    Change vs previous 13F -43,000 shares

    33.25% of the 13F portfolio, value $49,059,000.

    13F-HR 0001953324-26-000001 filed by Aquamarine Zurich AG
    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 140,600 shares
    Change vs previous 13F 0 shares

    22.27% of the 13F portfolio, value $70,685,000.

    13F-HR 0001953324-25-000007 filed by Aquamarine Zurich AG
    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/A 140,600 shares
    Change vs previous 13F 0 shares

    22.04% of the 13F portfolio, value $68,299,000.

    13F-HR/A 0001953324-25-000006 filed by Aquamarine Zurich AG
    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/A 140,600 shares
    Change vs previous 13F 0 shares

    25.5% of the 13F portfolio, value $74,881,000.

    13F-HR/A 0001953324-25-000005 filed by Aquamarine Zurich AG
    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 140,600 shares
    Change vs previous 13F 0 shares

    22.16% of the 13F portfolio, value $63,731,000.

    13F-HR 0001953324-25-000001 filed by Aquamarine Zurich AG
    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 140,600 shares
    Change vs previous 13F not available

    22.66% of the 13F portfolio, value $64,713,000.

    13F-HR 0001953324-24-000005 filed by Aquamarine Zurich AG
    Filed (acceptance time not in the bulk data set), ingested

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