$AON

$302.06 -$1.46 (0.48%) Close

$AON Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 212.1M shares outstanding

Who owns AON?

By type of holder

Institutions 90.6% Insiders 0.3% Everyone else 9.1%

Concentration Top 10 holders own 45.9%

BlackRock, Inc. 7.4% · Vanguard Capital Management LLC 6.4%

Institutional ownership

90.6%

+2.4 pts vs last qtr

Institutional holders

1,253

+4 vs last qtr

Net shares bought

+5.1M

by institutions in Q2 2026

New / sold out

138 / 134

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Jpmorgan Chase & Co +6.5M
Norges Bank NEW +2.8M

Biggest sellers in Q2 2026

UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC −1.2M
Polen Capital Management LLC −1.2M

Who is planning to sell?

Notices of proposed sale, last 12 months

$9.87M

8 notices from 3 people

Shares covered

29.1K

0.01% of the company

Arranged in advance

33%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Zeidel Darren Officer $7.75M
Goltermann Lori Officer $1.87M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2016–FY2025

−19.7%

−2.41% a year

Each share's claim on the business

+24.5%

grew without buying or selling a share

Spent on buybacks vs paid in stock

$3.66B vs $3.78B

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years80% 3–5 years3% 1–3 years8% Under 1 year9%

Quarterly turnover

11.1%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting AON on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	15.7M	7.41%	−432.1K (−2.7%)	≤2021	0.1%
Shares held by quarter Peak holding16.2M (Q4'25) Change over 8 quarters+1.5M Share of the company7.410% BlackRock, Inc.'s full portfolio →
VC Vanguard Capital Management LLC	13.6M	6.41%	+21.7K (+0.2%)	≤2021	0.1%
Shares held by quarter Peak holding13.6M (Q2'26) Change over 8 quarters+13.6M Share of the company6.410% Vanguard Capital Management LLC's full portfolio →

BlackRock, Inc.

15.7M

% of company

7.41%

Change vs last qtr

−432.1K (−2.7%)

Held since

≤2021

Vanguard Capital Management LLC

13.6M

% of company

6.41%

Change vs last qtr

+21.7K (+0.2%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Aon PLC, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting AON on Form N-PORT; together they hold 18.0% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$2.14B	6.4M	3.04%	0.09%	June 30, 2026
V5 Vanguard 500 Index Fund Vanguard Index Funds	$1.84B	5.5M	2.61%	0.11%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$2.14B

% of company

3.04%

% of the fund

0.09%

As of

June 30, 2026

Vanguard 500 Index Fund

Vanguard Index Funds

Position value

$1.84B

% of company

2.61%

% of the fund

0.11%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Aon PLC and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
CG Case Gregory C Insider	567.4K	0.27%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.270% Case Gregory C's insider activity →
KL Knight Lester B Insider	134.2K	0.06%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.060% Knight Lester B's insider activity →

Case Gregory C

Insider

567.4K

% of company

0.27%

Change vs last qtr

—

Held since

—

Knight Lester B

Insider

134.2K

% of company

0.06%

Change vs last qtr

—

Held since

—

2 more holders behind a free account

See every insider and 5%+ holder of Aon PLC.

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