How many institutional investors hold AON?

7 tracked institutional investors disclosed a position in AON (AON PLC) in their most recent 13F filing.

Who is the largest institutional holder of AON?

Andreas Halvorsen, Viking Global Investors, holds the largest disclosed position in AON, valued at $351M.

What sector is AON in?

AON PLC is classified in the Financial Services GICS sector, Insurance Brokers industry.

Where does this AON ownership data come from?

SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.

AON — AON PLC

Name: AON PLC (AON) — Institutional Ownership
Creator: InvestorLens
License: https://www.sec.gov/about/website-policies

Financial Services · Insurance Brokers

For educational research only.InvestorLens analyzes public regulatory filings (SEC EDGAR, STOCK Act PTRs) that may be delayed by 45 days or more. Information shown is historical and is not financial, legal, or tax advice, nor a recommendation or solicitation to buy or sell any security. Always do your own research.

InvestorLens aggregates public filing data to show which tracked investors reported holdings in this stock. Dollar values represent reported position values, not market capitalization, and may be delayed up to 45 days. Not a recommendation.

Sourced from SEC EDGAR public filings

About AON PLC (AON)

AON PLC (AON) appears in the most recent 13F filings of 7 tracked institutional investors. AON PLC is classified in the Financial Services sector (Insurance Brokers industry). The largest disclosed position is held by Andreas Halvorsen (Viking Global Investors), valued at $351M. Across recent filings, tracked investors recorded 11 new positions, 2 increased, 1 reduced, and 1 exited. All data sourced from SEC 13F filings.

Smart Money Consensus™

Based on recent institutional activity in AON

/100

Strong Institutional Accumulation

Added / Increased13

Reduced1

Exited1

BearishBullish

Crowded Trade Score™

How many top investors track AON

/100

Moderate Interest

7investors

Several tracked investors have exposure.

UndiscoveredCrowded

151015+

AON Ownership Composition

How AON PLC is held across tracked investor types, based on reported 13F positions.

Dominant Type

Other

98% of tracked value

Institutions

tracked investors

Total Reported

$678.9M

combined 13F value

Other98.2%
Hedge Funds1.6%
Value Investors0.2%

Other(5)

98.2%

Hedge Funds(1)

1.6%

Value Investors(1)

0.2%

Tracked investors reporting AON

Investor	Firm	Shares	Market value	% of portfolio	As of
Andreas Halvorsen	Viking Global Investors	1.1M	$350.9M	0.98%	Mar 31, 2026
Seth Klarman	Baupost Group	769K	$248.2M	4.85%	Mar 31, 2026
Izzy Englander	Millennium Management	56.7K	$18.3M	0.01%	Mar 31, 2026
Steve Cohen	Point72 Asset Management	33.3K	$10.7M	0.01%	Mar 31, 2026
Ken Griffin	Citadel Advisors	132.9K	$42.9M	0.01%	Mar 31, 2026
Ray Dalio	Bridgewater Associates	20.2K	$6.5M	0.03%	Mar 31, 2026
Warren Buffett	Berkshire Hathaway	3.6M	$1.3M	0.00%	Dec 31, 2025

Andreas HalvorsenMar 31, 2026
Viking Global Investors
Shares
1.1M
Value
$350.9M
% Portfolio
0.98%
Seth KlarmanMar 31, 2026
Baupost Group
Shares
769K
Value
$248.2M
% Portfolio
4.85%
Izzy EnglanderMar 31, 2026
Millennium Management
Shares
56.7K
Value
$18.3M
% Portfolio
0.01%
Steve CohenMar 31, 2026
Point72 Asset Management
Shares
33.3K
Value
$10.7M
% Portfolio
0.01%
Ken GriffinMar 31, 2026
Citadel Advisors
Shares
132.9K
Value
$42.9M
% Portfolio
0.01%
Ray DalioMar 31, 2026
Bridgewater Associates
Shares
20.2K
Value
$6.5M
% Portfolio
0.03%
Warren BuffettDec 31, 2025
Berkshire Hathaway
Shares
3.6M
Value
$1.3M
% Portfolio
0.00%

Recent activity

Investor	Action	Δ %	Current value	Filing date
Izzy Englander	New	—	$233.8M	Feb 17, 2026
Izzy Englander	New	—	$18.3M	May 15, 2026
Steve Cohen	New	—	$67.2M	Feb 17, 2026
Ken Griffin	New	—	$42.9M	May 15, 2026
Andreas Halvorsen	New	—	$276.5M	Feb 17, 2026
Andreas Halvorsen	New	—	$350.9M	May 15, 2026
Steve Cohen	New	—	$10.7M	May 15, 2026
Ray Dalio	Increased	51.25%	$6.5M	May 15, 2026
Warren Buffett	Sold	-100.00%	$0	May 15, 2026
Seth Klarman	New	—	$248.2M	May 14, 2026
Ray Dalio	Increased	134.32%	$4.7K	Feb 13, 2026
Warren Buffett	Reduced	-12.12%	$1.3M	Feb 17, 2026
Ken Griffin	New	—	$407.6K	Nov 14, 2025
Ray Dalio	New	—	$2K	Nov 13, 2025
Warren Buffett	New	—	$1.5M	Nov 14, 2025

Izzy Englander
New
$233.8MFeb 17, 2026
Izzy Englander
New
$18.3MMay 15, 2026
Steve Cohen
New
$67.2MFeb 17, 2026
Ken Griffin
New
$42.9MMay 15, 2026
Andreas Halvorsen
New
$276.5MFeb 17, 2026
Andreas Halvorsen
New
$350.9MMay 15, 2026
Steve Cohen
New
$10.7MMay 15, 2026
Ray Dalio
Increased
$6.5M(51.25%)May 15, 2026
Warren Buffett
Sold
$0(-100.00%)May 15, 2026
Seth Klarman
New
$248.2MMay 14, 2026
Ray Dalio
Increased
$4.7K(134.32%)Feb 13, 2026
Warren Buffett
Reduced
$1.3M(-12.12%)Feb 17, 2026
Ken Griffin
New
$407.6KNov 14, 2025
Ray Dalio
New
$2KNov 13, 2025
Warren Buffett
New
$1.5MNov 14, 2025

Frequently asked questions

How many institutional investors hold AON?: 7 tracked institutional investors disclosed a position in AON (AON PLC) in their most recent 13F filing.
Who is the largest institutional holder of AON?: Andreas Halvorsen, Viking Global Investors, holds the largest disclosed position in AON, valued at $351M.
Did institutional ownership of AON increase or decrease?: Across recent 13F filings, tracked investors recorded 11 new positions, 2 increased, 1 reduced, and 1 fully exited AON.
What sector is AON in?: AON PLC is classified in the Financial Services GICS sector, Insurance Brokers industry.
Where does this AON ownership data come from?: SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.