Security key
G0403H108
Aon plc - Class A Ordinary Shares $0.01 nominal value (AON)
CUSIP: G0403H108
Q3 2025 13F Holders as of 30 Sep 2025
- Security type / class
- Equity / Class A Ordinary Shares $0.01 nominal value
- Total 13F shares
- 185,578,549
- Total 13F value
- $66,168,867,034
- Share change
- -4,018,043
- Put/Call ratio
- 17%
- SEC-reported price per share
- $356.58
- Number of holders
- 1,233
- Value change
- -$1,428,985,869
- Number of buys
- 590
- Number of sells
- 484
- Shares outstanding
- 217,381,054
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q3 2025
Institutions
1,233
Top holders
10
AON full security history
Ownership snapshot
Full 13F holder table
Aon plc SEC filings
Aon plc company facts
Broader feeds
Ownership snapshot
Top reported holders of AON - Aon plc - Class A Ordinary Shares $0.01 nominal value (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
MASSACHUSETTS FINANCIAL S...
Disclosed value leader
VANGUARD GROUP INC
Comparable rows
15/15
Latest evidence
30 Jun 2025
13D/G
13F
Lead comparable stake: 4.6%
13D/G row: MASSACHUSETTS FINANCIAL SERVICES CO /MA/
Showing 1-6 of 15 holder rows.
Quick read
MASSACHUSETTS FINANCIAL SERVICES CO /MA/ leads the comparable SEC ownership view at 4.6%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens MASSACHUSETTS FINANCIAL SERVICES CO /MA/'s linked filing trail.
Comparable ownership
Top 5
MASSACHUSETTS FINANCIAL SERVICES ...
4.6%
VANGUARD GROUP INC
9.3%
BlackRock, Inc.
7.3%
Capital World Investors
5.6%
MORGAN STANLEY
4.4%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ |
13D/G
13F
Massachusetts Financial Services Company · Company
|
4.6%
|
$3,302,227,997
9,832,449 shares
|
$0 | 31 Mar 2025 |
| VANGUARD GROUP INC |
13F
Company
|
9.3%
|
$7,238,568,713
20,289,743 shares
|
— | 30 Jun 2025 |
| BlackRock, Inc. |
13F
Company
|
7.3%
|
$5,683,458,025
15,930,760 shares
|
— | 30 Jun 2025 |
| Capital World Investors |
13F
Company
|
5.6%
|
$4,332,531,115
12,144,237 shares
|
— | 30 Jun 2025 |
| MORGAN STANLEY |
13F
Company
|
4.4%
|
$3,377,594,708
9,467,412 shares
|
— | 30 Jun 2025 |
| STATE STREET CORP |
13F
Company
|
4.2%
|
$3,255,193,885
9,124,310 shares
|
— | 30 Jun 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q3 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
1,233
Shares
185,578,549
Rows available
1,233
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q3 2025 vs Q2 2025 Across Filers
Q2 2025 holders
1,210
Q3 2025 holders
1,233
Holder diff
23
| Investor | Q2 2025 Shares | Q3 2025 Shares | Share Diff | Share Chg % | Q2 2025 value | Q3 2025 value | Value change | Value Chg % |
|---|