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Berkshire Hathaway Inc: AON position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Berkshire Hathaway Inc on AON, newest first. How the timeline and the estimate are built.

Berkshire Hathaway Inc held 0 AON shares at 2026-03-31 per its 13F-HR filed 2026-05-15.

the latest 13F is the newest step

  1. period ended2026-03-31
    13F 0 shares
    Change vs previous 13F -3,602,995 shares

    13F-HR 0001193125-26-226661 filed by Berkshire Hathaway Inc
    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 ended2025-12-31
    13F 3,602,995 shares
    Change vs previous 13F -497,005 shares

    0.46% of the 13F portfolio, value $1,271,424,876.

    13F-HR 0001193125-26-054580 filed by Berkshire Hathaway Inc
    Filed (acceptance time not in the bulk data set), ingested

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

  3. period ended2025-09-30
    13F 4,100,000 shares
    Change vs previous 13F 0 shares

    0.55% of the 13F portfolio, value $1,461,978,000.

    13F-HR 0001193125-25-282901 filed by Berkshire Hathaway Inc
    Filed (acceptance time not in the bulk data set), ingested

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

  4. period ended2025-06-30
    13F 4,100,000 shares
    Change vs previous 13F 0 shares

    0.57% of the 13F portfolio, value $1,462,716,000.

    13F-HR 0000950123-25-008343 filed by Berkshire Hathaway Inc
    Filed (acceptance time not in the bulk data set), ingested

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

  5. period ended2025-03-31
    13F/A 4,100,000 shares
    Change vs previous 13F 0 shares

    0.63% of the 13F portfolio, value $1,636,269,000.

    13F-HR 0000950123-25-005701 filed by Berkshire Hathaway Inc
    Filed (acceptance time not in the bulk data set), ingested

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

  6. period ended2024-12-31
    13F 4,100,000 shares
    Change vs previous 13F 0 shares

    0.55% of the 13F portfolio, value $1,472,556,000.

    13F-HR 0000950123-25-002701 filed by Berkshire Hathaway Inc
    Filed (acceptance time not in the bulk data set), ingested

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

  7. period ended2024-09-30
    13F 4,100,000 shares
    Change vs previous 13F not available

    0.53% of the 13F portfolio, value $1,418,559,000.

    13F-HR 0000950123-24-011775 filed by Berkshire Hathaway Inc
    Filed (acceptance time not in the bulk data set), ingested

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