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VIKING GLOBAL INVESTORS LP: AON position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of VIKING GLOBAL INVESTORS LP on AON, newest first. How the timeline and the estimate are built.

VIKING GLOBAL INVESTORS LP held 1,151,269 AON shares at 2026-06-30 per its 13F-HR filed 2026-08-14.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 1,151,269 shares
    Change vs previous 13F +64,155 shares

    1.09% of the 13F portfolio, value $381,864,415.

    13F-HR 0001103804-26-000006 filed by VIKING GLOBAL INVESTORS LP
    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 1,087,114 shares
    Change vs previous 13F +303,464 shares

    0.98% of the 13F portfolio, value $350,898,657.

    13F-HR 0001103804-26-000004 filed by VIKING GLOBAL INVESTORS LP
    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 783,650 shares
    Change vs previous 13F -630,968 shares

    0.73% of the 13F portfolio, value $276,534,412.

    13F-HR 0001103804-26-000002 filed by VIKING GLOBAL INVESTORS LP
    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 1,414,618 shares
    Change vs previous 13F +1,414,618 shares

    1.31% of the 13F portfolio, value $504,424,486.

    13F-HR 0001103804-25-000010 filed by VIKING GLOBAL INVESTORS LP
    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 0 shares
    Change vs previous 13F -720,364 shares

    13F-HR 0001103804-25-000004 filed by VIKING GLOBAL INVESTORS LP
    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.

  6. period ended2024-12-31
    13F 720,364 shares
    Change vs previous 13F +157,337 shares

    0.84% of the 13F portfolio, value $258,725,934.

    13F-HR 0001103804-25-000002 filed by VIKING GLOBAL INVESTORS LP
    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 563,027 shares
    Change vs previous 13F not available

    0.71% of the 13F portfolio, value $194,801,712.

    13F-HR 0001103804-24-000006 filed by VIKING GLOBAL INVESTORS LP
    Filed (acceptance time not in the bulk data set), ingested

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