Aon plc

AON • NYSE

Aon plc is a insurance - brokers company in the financial services sector on NYSE, led by Gregory C. Case, with a market cap of $74.7B. As of Q3 2025, 86% of shares are held by 1,218 institutional investors, with VANGUARD GROUP INC as the largest holder at 9.27%.

Chief Executive OfficerGregory C. Case

Market Cap$74.7B

Insurance - Brokers

Financial Services

Employees50.0K

Websiteaon.com

Country

United States of America

Overview

Overview of institutional ownership in AON as of Q3 2025 with a market cap of $76.9B

All Institutions

Institutions: 1,218
Value Held: $66.1B
Shares Held: 185.3M
Avg Position: $54.2M
Median Position: $960.4K

Hedge Funds

Hedge Funds: 77
Value Held: $3.8B
Shares Held: 10.7M
Avg Position: $49.5M
Median Position: $3.8M

Ownership Breakdown

Institutional (non-HF)

80.97%

$62.3B

Hedge Funds

4.95%

$3.8B

Retail & Other

14.08%

$10.8B

Based on market cap of $76.9B as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in AON as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
VANGUARD GROUP INC Institution	Salim Ramji CEO	$7.1B 0.11% of portfolio	9.27% 20.0M shares	≤ Q2 2013 Held for 12y 5m+	$6.69T
B BlackRock, Inc. Institution	-	$5.7B 0.10% of portfolio	7.35% 15.8M shares	≤ Q2 2013 Held for 12y 5m+	$5.67T
C Capital World Investors Institution	-	$4.3B 0.59% of portfolio	5.60% 12.1M shares	Q3 2018 Held for 7y 2m	$730.00B
STATE STREET CORP Institution	Ronald P. O'Hanley CEO	$3.3B 0.11% of portfolio	4.28% 9.2M shares	≤ Q2 2013 Held for 12y 5m+	$2.88T
MASSACHUSETTS FINANCIAL SERVICES CO /MA/ Long Only Manager	Edward Murray Maloney CEO	$3.1B 0.97% of portfolio	4.06% 8.8M shares	≤ Q2 2013 Held for 12y 5m+	$322.72B
MORGAN STANLEY RIA/Wealth	Jed Finn CEO	$2.2B 0.13% of portfolio	2.85% 6.1M shares	≤ Q2 2013 Held for 12y 5m+	$1.65T
GEODE CAPITAL MANAGEMENT LLC ETF Provider	David Kenneth Lane CEO	$1.8B 0.12% of portfolio	2.37% 5.1M shares	≤ Q2 2013 Held for 12y 5m+	$1.57T
BERKSHIRE HATHAWAY INC Institution	Warren E. Buffett CEO	$1.5B 0.55% of portfolio	1.90% 4.1M shares	Q1 2021 Held for 4y 8m	$267.33B
Bank of New York Mellon Corp Institution	Robin Vince CEO	$1.3B 0.24% of portfolio	1.72% 3.7M shares	≤ Q2 2013 Held for 12y 5m+	$556.34B
DODGE & COX Long Only Manager	Dana Morton Emery CEO	$1.2B 0.67% of portfolio	1.61% 3.5M shares	Q3 2025 Held for 2 months	$185.33B

Net Capital Flow

Institutional buying and selling activity for AON in Q3 2025

Net Flow: −$2.7B
Buyers: 499
Sellers: 478
Total Bought: +$3.2B
Total Sold: −$5.9B
Avg Position: $52.8M

Biggest Buyers

Institution	Net Bought	Current Position
BALYASNY ASSET MANAGEMENT LLC Hedge Fund•Multi-Strategy	+$301.9M +846.7K shares	$301.9M 846.7K shares
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	+$277.5M +778.1K shares	$323.6M 907.6K shares
Independent Franchise Partners LLP Long Only Manager	+$219.5M +615.6K shares	$747.6M 2.1M shares
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	+$174.5M +489.5K shares	$177.1M 496.6K shares
V Vontobel Holding Ltd. Institution	+$152.7M +428.4K shares	$317.1M 889.3K shares
A Amundi Institution	+$144.1M +394.0K shares	$505.8M 1.4M shares
A ADAGE CAPITAL PARTNERS GP LLC Institution	+$122.6M +343.8K shares	$230.4M 646.1K shares
Veritas Asset Management LLP Long Only Manager	+$118.6M +332.7K shares	$732.3M 2.1M shares
R ROYAL BANK OF CANADA Institution	+$105.5M +296.0K shares	$337.3M 945.8K shares
FARALLON CAPITAL MANAGEMENT LLC Hedge Fund•Multi-Strategy	+$104.0M +291.6K shares	$812.3M 2.3M shares

Biggest Sellers

Institution	Net Sold	Current Position
MORGAN STANLEY RIA/Wealth	−$1.2B −3.3M shares	$2.2B 6.1M shares
JPMORGAN CHASE & CO Institution	−$482.2M −1.4M shares	$1.2B 3.3M shares
Artisan Partners Limited Partnership Long Only Manager	−$324.2M −909.3K shares	$451.7M 1.3M shares
M Mitsubishi UFJ Asset Management Co., Ltd. Institution	−$315.0M −883.5K shares	$650.2M 1.8M shares
FMR LLC Institution	−$311.8M −874.4K shares	$208.0M 583.3K shares
TWO SIGMA ADVISERS, LLC Hedge Fund•Multi-Strategy	−$258.4M −724.4K shares	Sold Off 0 shares
WELLINGTON MANAGEMENT CO LLP Long Only Manager	−$238.4M −668.5K shares	$158.8M 445.2K shares
LAZARD ASSET MANAGEMENT LLC Long Only Manager	−$200.6M −562.5K shares	$449.4M 1.3M shares
TWO SIGMA INVESTMENTS LLC Hedge Fund•Multi-Strategy	−$190.4M −533.9K shares	$34.1M 95.7K shares
Sustainable Growth Advisers, LP Long Only Manager	−$188.9M −529.8K shares	$469.7M 1.3M shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited AON in Q3 2025

New Positions: 48
New Value: $1.3B
Exited Positions: 84
Exited Value: $429.6M

New Positions

Institution	Position Value
DODGE & COX Long Only Manager	$1.2B 3.5M shares
Cinctive Capital Management LP Hedge Fund•Multi-Strategy	$12.0M 33.7K shares
Berman McAleer LLC RIA/Wealth	$6.5M 18.1K shares
C COMGEST GLOBAL INVESTORS S.A.S. Institution	$4.7M 13.1K shares
Point72 Ltd RIA/Wealth	$4.2M 11.6K shares
FJ Capital Management LLC Hedge Fund•Long/Short	$1.5M 4.2K shares
Cambria Investment Management, L.P. ETF Provider	$1.1M 3.1K shares
H Her Majesty the Queen in Right of the Province of Alberta as represented by Alberta Investment Management Corp Institution	$1.1M 3.0K shares
P PINNBROOK CAPITAL MANAGEMENT LP Hedge Fund•Global Macro	$1.0M 2.8K shares
Foundation Wealth Management, LLC RIA/Wealth	$941.0K 2.6K shares

Exited Positions

Institution	Previous Position
TWO SIGMA ADVISERS, LLC Hedge Fund•Multi-Strategy	$258.4M 724.4K shares
JUPITER ASSET MANAGEMENT LTD Long Only Manager	$46.9M 131.5K shares
Cercano Management LLC Family Office	$29.7M 83.2K shares
A AXA Institution	$16.6M 46.5K shares
U Unio Capital LLC Hedge Fund•Long/Short	$15.9M 44.6K shares
Select Equity Group, L.P. Hedge Fund•Multi-Strategy	$10.0M 28.0K shares
B Baader Bank INC Institution	$5.8M 16.3K shares
T TEXAS PERMANENT SCHOOL FUND Institution	$5.4M 15.2K shares
Point72 Europe LLP Digital Asset Manager	$3.3M 9.2K shares
Portfolio 21 Investments RIA/Wealth	$3.0M 8.5K shares

Options Activity

Institutions with the largest Call and Put options positions in AON as of Q3 2025

Call Positions: 28
Call Value: $284.1M
Put Positions: 20
Put Value: $48.4M

Call Positions

Institution	Position Value
Oribel Capital Management, LP Hedge Fund•Long/Short	$75.8M 2.1K contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$74.3M 2.1K contracts
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$59.7M 1.7K contracts
J JANE STREET GROUP, LLC Institution	$22.6M 635.0 contracts
W WOLVERINE TRADING, LLC Institution	$16.2M 456.0 contracts
BOOTHBAY FUND MANAGEMENT, LLC Fund of Funds	$14.2M 399.0 contracts
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	$5.6M 158.0 contracts
CAPITAL FUND MANAGEMENT S.A. Hedge Fund•Quant Macro	$3.6M 101.0 contracts
A Allianz Asset Management AG Institution	$2.6M 73.0 contracts
H HSBC HOLDINGS PLC Institution	$2.2M 61.0 contracts

Put Positions

Institution	Position Value
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$18.1M 507.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$9.6M 270.0 contracts
H HSBC HOLDINGS PLC Institution	$6.1M 171.0 contracts
A Allianz Asset Management AG Institution	$5.4M 151.0 contracts
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	$2.2M 62.0 contracts
BANK OF AMERICA CORP /DE/ Institution	$1.9M 52.0 contracts
W WOLVERINE TRADING, LLC Institution	$1.5M 42.0 contracts
J JANE STREET GROUP, LLC Institution	$1.2M 34.0 contracts
C Cubist Systematic Strategies, LLC Institution	$641.8K 18.0 contracts
Sequoia Financial Advisors, LLC RIA/Wealth	$463.6K 13.0 contracts

Most Committed Institutions

Institutions with AON as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
DiMeo Schneider & Associates, L.L.C. Pension/Endowment	Sabrina Marie Bailey CEO	11.13% $94.6M	0.12% 265.2K shares	Q2 2024 Held for 1y 5m	$849.4M
L LFL Advisers, LLC Hedge Fund•Value	Peter Clarke Lewis CCO	11.13% $32.1M	0.04% 90.1K shares	Q4 2020 Held for 4y 11m	$288.9M
A Aryeh Capital Management Ltd. Institution	-	9.64% $11.5M	0.01% 32.3K shares	Q2 2024 Held for 1y 5m	$119.5M
ALTRINSIC GLOBAL ADVISORS LLC Long Only Manager	John Douglas Hock CEO	9.01% $243.5M	0.32% 682.9K shares	Q2 2024 Held for 1y 5m	$2.7B
B BloombergSen Inc. Institution	Richard J Bloom President	8.57% $100.9M	0.13% 283.1K shares	≤ Q2 2013 Held for 12y 5m+	$1.2B
L LTS One Management LP Institution	-	7.94% $22.3M	0.03% 62.5K shares	Q1 2024 Held for 1y 8m	$280.7M
Veritas Asset Management LLP Long Only Manager	Antony Paul Burgess Managing Partner	7.82% $732.3M	0.95% 2.1M shares	Q1 2024 Held for 1y 8m	$9.4B
GLUSKIN SHEFF & ASSOC INC Long Only Manager	John Karl Mack Managing Partner	7.65% $60.5M	0.08% 169.8K shares	Q2 2018 Held for 7y 5m	$791.6M
G GFI Investment Counsel Ltd. RIA/Wealth	Daniel Todd Goodman CEO	6.22% $59.8M	0.08% 167.6K shares	Q2 2023 Held for 2y 5m	$960.1M
Broad Run Investment Management, LLC Long Only Manager	Ira Mitchell Rothberg Managing Partner	6.22% $38.0M	0.05% 106.6K shares	≤ Q2 2013 Held for 12y 5m+	$610.9M

Hedge Fund Spotlight

Discover hedge funds investing in AON

VIKING GLOBAL INVESTORS LP

Hedge Fund • Long/Short

Portfolio ManagerOle Andreas Halvorsen

Portfolio Value: $38.5B
Positions: 77
Last Reported: Q3 2025

Sector Allocation

Position in Aon plc

Market Value: $504.4M
Shares Held: 1.4M
Portfolio Weight: 1.31%
Owned Since: 2025-Q3

Top Holding	Sector	Market Value	Weight
1 PNC Financial Services PNC	Banks - Regional Financial Services	$1.6B	4.16%
2 JPMorgan Chase JPM	Banks - Diversified Financial Services	$1.6B	4.15%
3 Charles Schwab Corporation SCHW	Financial - Capital Markets Financial Services	$1.6B	4.12%

View full profile

Aon plc

Overview

All Institutions

Hedge Funds

Ownership Breakdown

Biggest Investors

Net Capital Flow

Biggest Buyers

Biggest Sellers

Entry and Exit Activity

New Positions

Exited Positions

Options Activity

Call Positions

Put Positions

Most Committed Institutions

Hedge Fund Spotlight

Position in Aon plc

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