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Disclosery

Summit X, LLC: BRK-B position timeline

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

Summit X, LLC held 0 BRK-B shares at 2025-09-30 per its 13F-HR filed 2025-11-13.

the latest 13F is the newest step

  1. period ended2025-09-30
    13F 0 shares
    Change vs previous 13F -7,144 shares

    13F-HR 0001697729-25-000003 filed by Summit X, LLC
    Filed (acceptance time not in the bulk data set), ingested

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

    Exited: the 13F for this period no longer lists the position.

  2. period ended2025-06-30
    13F 7,144 shares
    Change vs previous 13F +3,747 shares

    0.65% of the 13F portfolio, value $3,468,940.

    13F-HR 0001085146-25-004667 filed by Summit X, LLC
    Filed (acceptance time not in the bulk data set), ingested

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

  3. period ended2025-03-31
    13F 3,397 shares
    Change vs previous 13F -63 shares

    0.38% of the 13F portfolio, value $1,809,421.

    13F-HR 0001085146-25-002572 filed by Summit X, LLC
    Filed (acceptance time not in the bulk data set), ingested

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

  4. period ended2024-12-31
    13F 3,460 shares
    Change vs previous 13F -28 shares

    0.35% of the 13F portfolio, value $1,568,649.

    13F-HR 0001085146-25-000912 filed by Summit X, LLC
    Filed (acceptance time not in the bulk data set), ingested

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

  5. period ended2024-09-30
    13F 3,488 shares
    Change vs previous 13F -775 shares

    0.35% of the 13F portfolio, value $1,421,488.

    13F-HR 0001085146-24-005417 filed by Summit X, LLC
    Filed (acceptance time not in the bulk data set), ingested

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

  6. period ended2024-06-30
    13F 4,263 shares
    Change vs previous 13F +726 shares

    0.39% of the 13F portfolio, value $1,757,154.

    13F-HR 0001085146-24-003754 filed by Summit X, LLC
    Filed (acceptance time not in the bulk data set), ingested

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

  7. period ended2024-03-31
    13F 3,537 shares
    Change vs previous 13F +46 shares

    0.38% of the 13F portfolio, value $1,486,652.

    13F-HR 0001085146-24-002322 filed by Summit X, LLC
    Filed (acceptance time not in the bulk data set), ingested

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

  8. period ended2023-12-31
    13F 3,491 shares
    Change vs previous 13F not available

    0.35% of the 13F portfolio, value $1,245,125.

    13F-HR 0001085146-24-000889 filed by Summit X, LLC
    Filed (acceptance time not in the bulk data set), ingested

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