AON · Aon plc · Shareholders & Ownership

$306.80 +12.45 (+4.23%)

S&P 500 member Russell 1000 member Rebalance outlook locked

Market Cap

$64.55B

212.13M

Volume · Oct 22 1.64M Avg daily vol (3M) 1.62M

Every disclosed holder of AON in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

How the holder list picks a filing →

Who Owns AON

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

Holder group	Holders	Shares	% Out	Summed
Institutional (13F)	1,241	191,953,183	90.49%	Yes
Insiders (Forms 3, 4, 5)	23	2,027,904	0.96%	Yes
13D/G-only blocks	0	0	0.00%	Yes
Remaining	—	18,144,347	8.55%	Rest
Registered funds (N-PORT, not summed)	247	36,524,675	17.22%	No

Shares outstanding: 212,125,434, the issuer's latest cover-page count restated onto today's split basis.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of AON

One row per holder Every filing By ultimate parent

All 13F Funds Insiders 13D/G Non-US

#	Holder	Shares	% Out	Change	As of	Notes
1	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	15,716,429	7.41%	-432,078	Jun 30, 2026	carried, not yet filed for the newest quarter
1.1	iShares Russell 1000 Value ETF Fund S000004345 · Registered fund · Jun 30, 2026 iShares Trust, not summed	464,810	0.22%	+428,269	Jun 30, 2026	iShares Trust, not summed
1.2	iShares MSCI USA Min Vol Factor ETF Fund S000031838 · Registered fund · Jul 31, 2026 iShares Trust, not summed	315,074	0.15%	-1,456	Jul 31, 2026	iShares Trust, not summed
1.3	iShares Russell 1000 ETF Fund S000004347 · Registered fund · Jun 30, 2026 iShares Trust, not summed	144,766	0.07%	-5,081	Jun 30, 2026	iShares Trust, not summed
1.4	iShares U.S. Financials ETF Fund S000004323 · Registered fund · Jul 31, 2026 iShares Trust, not summed	140,484	0.07%	+24,696	Jul 31, 2026	iShares Trust, not summed
1.5	iShares MSCI ACWI ETF Fund S000021461 · Registered fund · Jul 31, 2026 iShares Trust, not summed	63,962	0.03%	-124	Jul 31, 2026	iShares Trust, not summed
2	JPMORGAN CHASE & CO 13G CIK 19617 · Bank · Sep 30, 2026 Rule 13d-1(b), qualified institution, not summed	14,312,078	6.75%	+2,138,739	Sep 30, 2026	Rule 13d-1(b), qualified institution, not summed
2.1	JPMORGAN CHASE & CO 13F CIK 19617 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	12,175,974	5.74%	+6,534,543	Jun 30, 2026	carried, not yet filed for the newest quarter
3	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	13,603,465	6.41%	+21,709	Jun 30, 2026	carried, not yet filed for the newest quarter
4	Capital World Investors 13F CIK 1422849 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	11,711,650	5.52%	+233,862	Jun 30, 2026	carried, not yet filed for the newest quarter
5	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	9,416,039	4.44%	+196,266	Jun 30, 2026	carried, not yet filed for the newest quarter
6	Dodge & Cox 13F CIK 200217 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	8,593,144	4.05%	+477,049	Jun 30, 2026	carried, not yet filed for the newest quarter
6.1	Dodge & Cox Stock Fund Fund S000011202 · Registered fund · Jun 30, 2026 Dodge & Cox Funds, not summed	3,684,200	1.74%	0	Jun 30, 2026	Dodge & Cox Funds, not summed
6.2	Dodge & Cox International Stock Fund Fund S000011203 · Registered fund · Jun 30, 2026 Dodge & Cox Funds, not summed	2,553,000	1.20%	+303,800	Jun 30, 2026	Dodge & Cox Funds, not summed
6.3	Dodge & Cox Balanced Fund Fund S000011204 · Registered fund · Jun 30, 2026 Dodge & Cox Funds, not summed	357,700	0.17%	0	Jun 30, 2026	Dodge & Cox Funds, not summed
6.4	Dodge & Cox Global Stock Fund Fund S000022057 · Registered fund · Jun 30, 2026 Dodge & Cox Funds, not summed	351,100	0.17%	-36,000	Jun 30, 2026	Dodge & Cox Funds, not summed
7	MASSACHUSETTS FINANCIAL SERVICES CO /MA/ 13F CIK 912938 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	7,615,397	3.59%	-742,700	Jun 30, 2026	carried, not yet filed for the newest quarter
8	VANGUARD PORTFOLIO MANAGEMENT LLC 13F CIK 2100121 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	7,202,991	3.40%	+2,643,956	Jun 30, 2026	carried, not yet filed for the newest quarter
9	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	6,442,152	3.04%	-23,467	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
10	MORGAN STANLEY 13F CIK 895421 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	6,214,787	2.93%	-160,158	Jun 30, 2026	carried, not yet filed for the newest quarter
11	VANGUARD 500 INDEX FUND Fund S000002839 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	5,535,004	2.61%	+85,414	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
12	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	5,180,553	2.44%	-63,756	Jun 30, 2026	carried, not yet filed for the newest quarter
13	Bank of New York Mellon Corp 13F CIK 1390777 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	3,191,212	1.50%	-129,880	Jun 30, 2026	carried, not yet filed for the newest quarter
14	PRICE T ROWE ASSOCIATES INC /MD/ 13F CIK 80255 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,136,640	1.48%	+1,855,714	Jun 30, 2026	carried, not yet filed for the newest quarter
14.1	T. Rowe Price U.S. Equity Research ETF Fund S000071604 · Registered fund · Jun 30, 2026 T. Rowe Price Exchange-Traded Funds, Inc., not summed	37,586	0.02%	+23,472	Jun 30, 2026	T. Rowe Price Exchange-Traded Funds, Inc., not summed
14.2	T. Rowe Price Capital Appreciation Premium Income ETF Fund S000089785 · Registered fund · Jun 30, 2026 T. Rowe Price Exchange-Traded Funds, Inc., not summed	9,756	0.00%	-344	Jun 30, 2026	T. Rowe Price Exchange-Traded Funds, Inc., not summed
14.3	T. Rowe Price Dividend Growth ETF Fund S000067975 · Registered fund · Jun 30, 2026 T. Rowe Price Exchange-Traded Funds, Inc., not summed	8,614	0.00%	-106	Jun 30, 2026	T. Rowe Price Exchange-Traded Funds, Inc., not summed
14.4	T. Rowe Price Financials ETF Fund S000092021 · Registered fund · Jun 30, 2026 T. Rowe Price Exchange-Traded Funds, Inc., not summed	452	0.00%	+95	Jun 30, 2026	T. Rowe Price Exchange-Traded Funds, Inc., not summed
14.5	T. Rowe Price Active Core U.S. Equity ETF Fund S000095884 · Registered fund · Jun 30, 2026 T. Rowe Price Exchange-Traded Funds, Inc., not summed	35	0.00%	-7	Jun 30, 2026	T. Rowe Price Exchange-Traded Funds, Inc., not summed
15	NORGES BANK 13F CIK 1374170 · Non-US institution · Jun 30, 2026 carried, not yet filed for the newest quarter	2,796,760	1.32%	—	Jun 30, 2026	carried, not yet filed for the newest quarter
16	Mitsubishi UFJ Asset Management Co., Ltd. 13F CIK 1466546 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	2,753,913	1.30%	+237,276	Jun 30, 2026	carried, not yet filed for the newest quarter
17	Independent Franchise Partners LLP 13F CIK 1483866 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,646,943	1.25%	+58,941	Jun 30, 2026	carried, not yet filed for the newest quarter
17.1	Independent Franchise Partners US Equity Fund Fund S000032964 · Registered fund · Jun 30, 2026 Advisers Investment Trust, not summed	186,451	0.09%	-27,245	Jun 30, 2026	Advisers Investment Trust, not summed
18	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 13F CIK 1164508 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,614,754	1.23%	+1,817,336	Jun 30, 2026	carried, not yet filed for the newest quarter
19	DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main 13F CIK 1694217 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	2,255,768	1.06%	-692,642	Jun 30, 2026	carried, not yet filed for the newest quarter
20	VANGUARD MID-CAP INDEX FUND Fund S000002844 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	2,198,119	1.04%	—	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
21	Boston Partners 13F CIK 1386060 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,089,773	0.99%	+134,741	Jun 30, 2026	carried, not yet filed for the newest quarter
22	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	2,040,534	0.96%	-41,571	Jun 30, 2026	carried, not yet filed for the newest quarter
22.1	Stock Index Fund Fund S000001247 · Registered fund · Jun 30, 2026 Northern Funds, not summed	63,411	0.03%	-97	Jun 30, 2026	Northern Funds, not summed
22.2	Active M International Equity Fund Fund S000012492 · Registered fund · Jun 30, 2026 Northern Funds, not summed	6,107	0.00%	0	Jun 30, 2026	Northern Funds, not summed
23	VANGUARD VALUE INDEX FUND Fund S000002840 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	1,931,138	0.91%	+48,817	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
24	AQR CAPITAL MANAGEMENT LLC 13F CIK 1167557 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,905,800	0.90%	+926,045	Jun 30, 2026	carried, not yet filed for the newest quarter
25	WCM INVESTMENT MANAGEMENT, LLC 13F CIK 1061186 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,875,859	0.88%	-76,520	Jun 30, 2026	carried, not yet filed for the newest quarter
25.1	WCM Focused International Growth Fund Fund S000032897 · Registered fund · Jun 30, 2026 INVESTMENT MANAGERS SERIES TRUST, not summed	747,970	0.35%	0	Jun 30, 2026	INVESTMENT MANAGERS SERIES TRUST, not summed
26	Artisan Partners Limited Partnership 13F CIK 1466153 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,850,623	0.87%	+206,471	Jun 30, 2026	carried, not yet filed for the newest quarter
27	GOLDMAN SACHS GROUP INC 13F CIK 886982 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	1,748,801	0.82%	+164,810	Jun 30, 2026	carried, not yet filed for the newest quarter
28	NEUBERGER BERMAN GROUP LLC 13F CIK 1465109 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	1,691,729	0.80%	-166,105	Jun 30, 2026	carried, not yet filed for the newest quarter
29	BANK OF AMERICA CORP /DE/ 13F CIK 70858 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	1,624,970	0.77%	+42,290	Jun 30, 2026	carried, not yet filed for the newest quarter
30	Veritas Asset Management LLP 13F CIK 1541448 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,408,111	0.66%	-112,166	Jun 30, 2026	carried, not yet filed for the newest quarter
31	FARALLON CAPITAL MANAGEMENT LLC 13F CIK 909661 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,382,562	0.65%	-1,130,076	Jun 30, 2026	carried, not yet filed for the newest quarter
32	CHARLES SCHWAB INVESTMENT MANAGEMENT INC 13F CIK 884546 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,345,367	0.63%	-9,727	Jun 30, 2026	carried, not yet filed for the newest quarter
33	Case Gregory C Insider CIK 1322803 · Feb 19, 2026 Director, President & CEO, issuer-wide	1,314,360	0.62%	—	Feb 19, 2026	Director, President & CEO, issuer-wide
34	Legal & General Group Plc 13F CIK 764068 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,288,852	0.61%	-52,370	Jun 30, 2026	carried, not yet filed for the newest quarter
35	DIMENSIONAL FUND ADVISORS LP 13F CIK 354204 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,240,634	0.58%	-13,135	Jun 30, 2026	carried, not yet filed for the newest quarter
35.1	Dimensional U.S. Core Equity 2 ETF Fund S000070903 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	222,700	0.11%	+2,636	Jul 31, 2026	Dimensional ETF Trust, not summed
35.2	Dimensional US High Profitability ETF Fund S000075148 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	140,110	0.07%	-8,390	Jul 31, 2026	Dimensional ETF Trust, not summed
35.3	Dimensional U.S. Equity Market ETF Fund S000070902 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	62,151	0.03%	+1,517	Jul 31, 2026	Dimensional ETF Trust, not summed
35.4	Dimensional US Core Equity Market ETF Fund S000069432 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	46,185	0.02%	+3,428	Jul 31, 2026	Dimensional ETF Trust, not summed
35.5	Dimensional US Core Equity 1 ETF Fund S000081780 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	12,957	0.01%	+1,045	Jul 31, 2026	Dimensional ETF Trust, not summed
36	VANGUARD DIVIDEND APPRECIATION INDEX FUND Fund S000011322 · Registered fund · Jul 31, 2026 VANGUARD SPECIALIZED FUNDS, not summed	1,208,405	0.57%	+4,039	Jul 31, 2026	VANGUARD SPECIALIZED FUNDS, not summed
37	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,190,449	0.56%	-35,114	Jun 30, 2026	carried, not yet filed for the newest quarter
38	Mawer Investment Management Ltd. 13F CIK 1538449 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,171,624	0.55%	-105,464	Jun 30, 2026	carried, not yet filed for the newest quarter
39	VANGUARD INSTITUTIONAL INDEX FUND Fund S000002853 · Registered fund · Jun 30, 2026 VANGUARD INSTITUTIONAL INDEX FUNDS, not summed	1,159,435	0.55%	-50,010	Jun 30, 2026	VANGUARD INSTITUTIONAL INDEX FUNDS, not summed
40	VIKING GLOBAL INVESTORS LP 13F CIK 1103804 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,151,269	0.54%	+64,155	Jun 30, 2026	carried, not yet filed for the newest quarter
41	LAZARD ASSET MANAGEMENT LLC 13F CIK 1207017 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,122,874	0.53%	-94,369	Jun 30, 2026	carried, not yet filed for the newest quarter
42	DIAMOND HILL CAPITAL MANAGEMENT INC 13F CIK 1217541 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,114,156	0.53%	-373,731	Jun 30, 2026	carried, not yet filed for the newest quarter
42.1	DIAMOND HILL LARGE CAP FUND Fund S000003155 · Registered fund · Jun 30, 2026 Diamond Hill Funds, not summed	350,501	0.17%	-88,220	Jun 30, 2026	Diamond Hill Funds, not summed
42.2	DIAMOND HILL LONG SHORT FUND Fund S000003156 · Registered fund · Jun 30, 2026 Diamond Hill Funds, not summed	182,842	0.09%	+18,805	Jun 30, 2026	Diamond Hill Funds, not summed
42.3	DIAMOND HILL SELECT FUND Fund S000012191 · Registered fund · Jun 30, 2026 Diamond Hill Funds, not summed	41,071	0.02%	+1,895	Jun 30, 2026	Diamond Hill Funds, not summed
42.4	DIAMOND HILL LARGE CAP CONCENTRATED ETF Fund S000094326 · Registered fund · Jun 30, 2026 Diamond Hill Funds, not summed	15,379	0.01%	+2,763	Jun 30, 2026	Diamond Hill Funds, not summed
43	Invesco Ltd. 13F CIK 914208 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,069,331	0.50%	-417,292	Jun 30, 2026	carried, not yet filed for the newest quarter
43.1	Invesco S&P 500 Equal Weight ETF Fund S000060812 · Registered fund · Jul 31, 2026 Invesco Exchange-Traded Fund Trust, not summed	554,573	0.26%	+21,686	Jul 31, 2026	Invesco Exchange-Traded Fund Trust, not summed
43.2	Invesco KBW Property & Casualty Insurance ETF Fund S000030363 · Registered fund · May 31, 2026 Invesco Exchange-Traded Fund Trust II, not summed	62,952	0.03%	+470	May 31, 2026	Invesco Exchange-Traded Fund Trust II, not summed
43.3	Invesco Equally-Weighted S&P 500 Fund Fund S000027817 · Registered fund · May 31, 2026 AIM Counselor Series Trust (Invesco Counselor Series Trust), not summed	42,425	0.02%	+3,222	May 31, 2026	AIM Counselor Series Trust (Invesco Counselor Series Trust), not summed
43.4	Invesco MSCI USA ETF Fund S000058746 · Registered fund · May 31, 2026 Invesco Exchange-Traded Fund Trust II, not summed	35,403	0.02%	+516	May 31, 2026	Invesco Exchange-Traded Fund Trust II, not summed
43.5	Invesco RAFI US 1000 ETF Fund S000011995 · Registered fund · Jul 31, 2026 Invesco Exchange-Traded Fund Trust, not summed	30,692	0.01%	+2,617	Jul 31, 2026	Invesco Exchange-Traded Fund Trust, not summed
44	Amundi 13F CIK 1330387 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	993,712	0.47%	-509,178	Jun 30, 2026	carried, not yet filed for the newest quarter
45	Nuveen, LLC 13F CIK 1871926 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	878,682	0.41%	+27,601	Jun 30, 2026	carried, not yet filed for the newest quarter
45.1	College Retirement Equities Fund - Total Global Stock Account Fund S000005080 · Registered fund · Jun 30, 2026 College Retirement Equities Fund, not summed	343,583	0.16%	+72,377	Jun 30, 2026	College Retirement Equities Fund, not summed
45.2	Nuveen Equity Index Fund Fund S000005360 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	174,049	0.08%	-1,480	Jul 31, 2026	TIAA-CREF Funds, not summed
45.3	College Retirement Equities Fund - S&P 500 Index Account Fund S000005083 · Registered fund · Jun 30, 2026 College Retirement Equities Fund, not summed	94,678	0.04%	-5,353	Jun 30, 2026	College Retirement Equities Fund, not summed
45.4	Nuveen Large Cap Value Index Fund Fund S000005388 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	76,114	0.04%	+70,125	Jul 31, 2026	TIAA-CREF Funds, not summed
45.5	Nuveen S&P 500 Index Fund Fund S000005361 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	45,505	0.02%	-1,425	Jul 31, 2026	TIAA-CREF Funds, not summed
46	UBS Group AG 13F CIK 1610520 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	822,267	0.39%	-81,661	Jun 30, 2026	carried, not yet filed for the newest quarter
47	COMGEST GLOBAL INVESTORS S.A.S. 13F CIK 1574947 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	820,270	0.39%	+191,570	Jun 30, 2026	carried, not yet filed for the newest quarter
48	Capital International Investors 13F CIK 1562230 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	793,989	0.37%	-13,086	Jun 30, 2026	carried, not yet filed for the newest quarter
49	Longview Partners (Guernsey) LTD 13F CIK 1426092 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	768,975	0.36%	-207,288	Jun 30, 2026	carried, not yet filed for the newest quarter
50	FIL Ltd 13F CIK 318989 · Non-US institution · Jun 30, 2026 carried, not yet filed for the newest quarter	753,981	0.36%	+8,022	Jun 30, 2026	carried, not yet filed for the newest quarter

37 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

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Key facts CIK 315293 CUSIP G0403H108 13F (30d) 238 filings 216 filers Visit website Investor relations