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Chesley Taft & Associates LLC: AON position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Chesley Taft & Associates LLC on AON, newest first. How the timeline and the estimate are built.

Chesley Taft & Associates LLC held 3,105 AON shares at 2026-09-30 per its 13F-HR filed 2026-10-13.

the latest 13F is the newest step

  1. period ended2026-09-30
    13F 3,105 shares
    Change vs previous 13F -976 shares

    0.03% of the 13F portfolio, value $859,371.

    13F-HR 0001164632-26-000006 filed by Chesley Taft & Associates LLC
    Accepted , ingested

  2. period ended2026-06-30
    13F 4,081 shares
    Change vs previous 13F +8 shares

    0.05% of the 13F portfolio, value $1,353,627.

    13F-HR 0001164632-26-000004 filed by Chesley Taft & Associates LLC
    Filed (acceptance time not in the bulk data set), ingested

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

  3. period ended2026-03-31
    13F 4,073 shares
    Change vs previous 13F -5 shares

    0.05% of the 13F portfolio, value $1,314,683.

    13F-HR 0001164632-26-000002 filed by Chesley Taft & Associates LLC
    Filed (acceptance time not in the bulk data set), ingested

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

  4. period ended2025-12-31
    13F 4,078 shares
    Change vs previous 13F +6 shares

    0.06% of the 13F portfolio, value $1,439,045.

    13F-HR 0001164632-26-000001 filed by Chesley Taft & Associates LLC
    Filed (acceptance time not in the bulk data set), ingested

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

  5. period ended2025-09-30
    13F 4,072 shares
    Change vs previous 13F 0 shares

    0.06% of the 13F portfolio, value $1,451,994.

    13F-HR 0001085146-25-005836 filed by Chesley Taft & Associates LLC
    Filed (acceptance time not in the bulk data set), ingested

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

  6. period ended2025-06-30
    13F 4,072 shares
    Change vs previous 13F 0 shares

    0.06% of the 13F portfolio, value $1,452,727.

    13F-HR 0001085146-25-003693 filed by Chesley Taft & Associates LLC
    Filed (acceptance time not in the bulk data set), ingested

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

  7. period ended2025-03-31
    13F 4,072 shares
    Change vs previous 13F +650 shares

    0.08% of the 13F portfolio, value $1,625,094.

    13F-HR 0001085146-25-002016 filed by Chesley Taft & Associates LLC
    Filed (acceptance time not in the bulk data set), ingested

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

  8. period ended2024-12-31
    13F 3,422 shares
    Change vs previous 13F not available

    0.06% of the 13F portfolio, value $1,229,046.

    13F-HR 0001085146-25-000305 filed by Chesley Taft & Associates LLC
    Filed (acceptance time not in the bulk data set), ingested

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