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Disclosery

PEAK6 LLC: BRK-B position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of PEAK6 LLC on BRK-B, newest first. How the timeline and the estimate are built.

PEAK6 LLC held 18,325 BRK-B shares at 2026-06-30 per its 13F-HR filed 2026-08-13.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 18,325 shares
    Change vs previous 13F +17,068 shares

    0.22% of the 13F portfolio, value $9,169,647.

    13F-HR 0001389958-26-000014 filed by PEAK6 LLC
    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 1,257 shares
    Change vs previous 13F -3,020 shares

    0.02% of the 13F portfolio, value $602,130.

    13F-HR 0001389958-26-000013 filed by PEAK6 LLC
    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/A 4,277 shares
    Change vs previous 13F +3,162 shares

    0.06% of the 13F portfolio, value $2,150,005.

    13F-HR/A 0001389958-26-000008 filed by PEAK6 LLC
    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/A 1,115 shares
    Change vs previous 13F -3,765 shares

    0.01% of the 13F portfolio, value $560,475.

    13F-HR/A 0001389958-26-000011 filed by PEAK6 LLC
    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 4,880 shares
    Change vs previous 13F +4,877 shares

    0.08% of the 13F portfolio, value $2,370,722.

    13F-HR/A 0001389958-26-000010 filed by PEAK6 LLC
    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 3 shares
    Change vs previous 13F 0 shares

    <0.01% of the 13F portfolio, value $1,428.

    13F-HR 0001389958-25-000011 filed by PEAK6 LLC
    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 3 shares
    Change vs previous 13F not available

    <0.01% of the 13F portfolio, value $1,529.

    13F-HR 0001389958-25-000006 filed by PEAK6 LLC
    Filed (acceptance time not in the bulk data set), ingested

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