Chesley Taft & Associates LLC

Position in AON — Aon plc

CIK 1164632 CHICAGO, IL

Position in AON

as of Jun 30, 2026 · filed Jul 8, 2026 Compact

Position Value

$1,353,626

+$38,944 QoQ

Shares Held

4,081

+0.2% QoQ

Ownership

0.002%

of shares outstanding

% of Portfolio

0.07%

of 13F equity value

Holder Rank

#532

of 1,246 holders

Holding Since

Mar 2020

26 quarters on record

Voting authority Sole 54% Shared 0% None 46%

Financial Services · as of Jun 30, 2026

Chesley Taft & Associates LLC holds $10,811,106 across 3 Insurance Brokers names. AON ranks #2 (12.5% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	WTW	Willis Towers Watson PLC	31,336	$8,190,289
2	AON	Aon plc This page	4,081	$1,353,626
3	MRSH	Marsh & Mclennan Companies, Inc.	7,603	$1,267,191

26 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$1,353,626	4,081	+0.2%	Shares	Sole	2026-07-08
2026-03-31	$1,314,682	4,073	-0.1%	Shares	Sole	2026-04-13
2025-12-31	$1,439,044	4,078	+0.1%	Shares	Sole	2026-01-14
2025-09-30	$1,451,993	4,072	0.0%	Shares	Sole	2025-10-08
2025-06-30	$1,452,726	4,072	0.0%	Shares	Sole	2025-07-09
2025-03-31	$1,625,094	4,072	+19.0%	Shares	Sole	2025-04-10
2024-12-31	$1,229,045	3,422	0.0%	Shares	Sole	2025-01-17
2024-09-30	$1,183,977	3,422	-4.2%	Shares	Sole	2024-10-07
2024-06-30	$1,048,667	3,572	-68.5%	Shares	Sole	2024-07-19
2024-03-31	$3,789,724	11,356	-1.1%	Shares	Sole	2024-04-16
2023-12-31	$3,340,327	11,478	-0.4%	Shares	Sole	2024-01-11
2023-09-30	$3,735,338	11,521	-1.7%	Shares	Sole	2023-10-11
2023-06-30	$4,047,815	11,726	+0.5%	Shares	Sole	2023-07-18
2023-03-31	$3,678,173	11,666	+0.7%	Shares	Sole	2023-04-11
2022-12-31	$3,475,921	11,581	+1.2%	Shares	Sole	2023-01-20
2022-09-30	$3,066,307	11,447	+0.7%	Shares	Sole	2022-10-13
2022-06-30	$3,065,452	11,367	+0.7%	Shares	Sole	2022-07-07
2022-03-31	$3,677,013	11,292	+1.3%	Shares	Sole	2022-04-14
2021-12-31	$3,350,342	11,147	+0.2%	Shares	Sole	2022-01-05
2021-09-30	$3,178,333	11,122	+1.0%	Shares	Sole	2021-10-05
2021-06-30	$2,629,225	11,012	+1.1%	Shares	Sole	2021-07-07
2021-03-31	$2,507,508	10,897	+0.6%	Shares	Sole	2021-04-06
2020-12-31	$2,289,532	10,837	-0.1%	Shares	Sole	2021-01-11
2020-09-30	$2,238,767	10,852	-2.1%	Shares	Sole	2020-10-08
2020-06-30	$2,135,356	11,087	-1.5%	Shares	Sole	2020-07-08
2020-03-31	$1,857,855	11,257	—	Shares	Sole	2020-04-15
No filing history on record for this holder in this stock.