Latest Period
Q1 2026
Security Snapshot
Aon plc - Class A Ordinary Shares (AON) Institutional Ownership
CUSIP: G0403H108
13F Institutional Holders and Ownership History from Q1 2016 to Q1 2026
Institutions Reporting
1,242
Shares (Excl. Options)
187,553,683
Price
$322.78
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- Security type / class
- Equity / Class A Ordinary Shares
- Symbol
- AON on NYSE
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 187,553,683
- Total 13F value
- $60,595,546,131
- Portfolio coverage rank
- 0.04%
- Share change
- -1,692,742
- Value change
- -$774,772,520
- Number of holders
- 1,242
- Shares outstanding
- 213,748,891
- SEC-reported price per share
- $324.22
- Insider filing price
- $324.22
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- AON - Aon plc - Class A Ordinary Shares is tracked under CUSIP G0403H108.
- 1242 institutions reported positions in Q1 2026.
- 1 significant owner is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 1,270 to 1,242 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $66,602,828,601 to $60,595,546,131.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 1242 institutions filings for Q1 2026.
Security key
G0403H108
Latest holder period
Q1 2026
13F holders
1,242
13D/G owners
1
CIK / CUSIP context first
Open Q1 2026 holders
AON full holder history
Aon plc SEC filings
Aon plc company facts
Aon plc insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP G0403H108:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
1
Security
AON
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 4.6% | $3,302,227,997 | 9,832,449 | Massachusetts Financial Services Company | 31 Mar 2025 |
As of 31 Mar 2026, 1,242 institutional investors reported holding 187,553,683 shares of Aon plc - Class A Ordinary Shares (AON). This represents 88% of the company’s total 213,748,891 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
56%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 7.6% | 16,148,507 | -0.54% | 0.09% | $5,212,414,954 |
| VANGUARD CAPITAL MANAGEMENT LLC | 6.4% | 13,581,756 | 0% | 0.11% | $4,383,919,201 |
| Capital World Investors | 5.4% | 11,477,788 | -6.3% | 0.51% | $3,704,816,237 |
| STATE STREET CORP | 4.3% | 9,219,773 | +0.17% | 0.1% | $2,976,090,171 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 3.9% | 8,358,097 | -2.2% | 0.97% | $2,752,001,161 |
| Dodge & Cox | 3.8% | 8,116,095 | +3.4% | 1.4% | $2,619,713,144 |
| MORGAN STANLEY | 3% | 6,374,945 | +14% | 0.12% | $2,057,706,214 |
| JPMORGAN CHASE & CO | 2.6% | 5,641,431 | +77% | 0.12% | $1,828,162,855 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.5% | 5,244,309 | +2% | 0.1% | $1,685,913,492 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 2.1% | 4,559,035 | 0% | 0.08% | $1,471,565,317 |
| Bank of New York Mellon Corp | 1.6% | 3,321,092 | -4.5% | 0.2% | $1,071,981,874 |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | 1.4% | 2,948,410 | +22% | 0.87% | $951,687,779 |
| Independent Franchise Partners LLP | 1.2% | 2,588,002 | +22% | 5.8% | $835,355,285 |
| Mitsubishi UFJ Asset Management Co., Ltd. | 1.2% | 2,516,637 | +39% | 0.55% | $812,320,091 |
| FARALLON CAPITAL MANAGEMENT LLC | 1.2% | 2,512,638 | -5.7% | 5.3% | $811,029,294 |
| NORTHERN TRUST CORP | 0.97% | 2,082,105 | -0.84% | 0.09% | $672,061,851 |
| Boston Partners | 0.91% | 1,955,032 | +20% | 0.66% | $631,082,064 |
| WCM INVESTMENT MANAGEMENT, LLC | 0.91% | 1,952,379 | -1.7% | 1.4% | $632,688,017 |
| NEUBERGER BERMAN GROUP LLC | 0.87% | 1,857,834 | +3% | 0.46% | $599,684,142 |
| Artisan Partners Limited Partnership | 0.77% | 1,644,152 | +47% | 0.87% | $530,699,383 |
| GOLDMAN SACHS GROUP INC | 0.74% | 1,583,991 | +12% | 0.07% | $511,280,502 |
| BANK OF AMERICA CORP /DE/ | 0.74% | 1,582,680 | +16% | 0.04% | $510,857,447 |
| Veritas Asset Management LLP | 0.71% | 1,520,277 | -24% | 8.3% | $490,715,010 |
| Amundi | 0.7% | 1,502,890 | +23% | 0.13% | $485,102,834 |
| DIAMOND HILL CAPITAL MANAGEMENT INC | 0.7% | 1,487,887 | -6.8% | 3% | $480,260,195 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
41
Latest
Q1 2026
Rows shown
1-25 of 41
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 187,553,683 | $60,595,546,131 | -$774,772,520 | $322.78 | 1,242 |
| 2025 Q4 | 188,822,638 | $66,602,828,601 | +$1,017,832,703 | $352.88 | 1,270 |
| 2025 Q3 | 185,578,549 | $66,168,867,034 | -$1,428,985,869 | $356.58 | 1,233 |
| 2025 Q2 | 193,803,967 | $69,114,264,150 | +$824,711,581 | $356.76 | 1,210 |
| 2025 Q1 | 191,456,033 | $76,204,395,920 | -$79,841,731 | $399.09 | 1,253 |
| 2024 Q4 | 191,857,609 | $68,879,464,589 | +$390,817,099 | $359.16 | 1,173 |
| 2024 Q3 | 189,740,974 | $65,657,607,450 | +$1,123,217,468 | $345.99 | 1,130 |
| 2024 Q2 | 188,039,170 | $55,200,997,498 | +$4,947,770,572 | $293.58 | 1,095 |
| 2024 Q1 | 171,335,880 | $57,146,952,089 | +$380,525,454 | $333.72 | 1,067 |
| 2023 Q4 | 170,590,442 | $49,635,116,331 | -$914,310,510 | $291.02 | 1,048 |
| 2023 Q3 | 173,485,949 | $56,245,969,960 | -$1,089,310,633 | $324.22 | 1,029 |
| 2023 Q2 | 176,411,103 | $60,830,438,597 | +$299,365,357 | $345.20 | 1,006 |
| 2023 Q1 | 175,828,109 | $55,427,031,219 | +$492,490,942 | $315.29 | 994 |
| 2022 Q4 | 174,881,399 | $52,495,174,967 | -$1,399,952,425 | $300.14 | 1,014 |
| 2022 Q3 | 180,194,038 | $48,296,882,905 | -$738,928,077 | $267.87 | 926 |
| 2022 Q2 | 182,574,562 | $49,227,391,620 | -$942,510,898 | $269.68 | 937 |
| 2022 Q1 | 186,968,158 | $60,864,804,673 | +$69,133,410 | $325.63 | 957 |
| 2021 Q4 | 186,590,632 | $56,046,602,243 | -$3,586,959,629 | $300.56 | 967 |
| 2021 Q3 | 198,914,605 | $56,824,552,864 | -$6,396,401,166 | $285.77 | 888 |
| 2021 Q2 | 222,288,630 | $53,060,908,361 | +$233,292,685 | $238.76 | 884 |
| 2021 Q1 | 222,036,826 | $51,077,860,032 | -$83,947,311 | $230.11 | 882 |
| 2020 Q4 | 221,347,782 | $46,727,506,080 | +$435,423,752 | $211.27 | 828 |
| 2020 Q3 | 219,584,614 | $45,288,574,344 | +$1,522,216,262 | $206.30 | 767 |
| 2020 Q2 | 212,172,294 | $40,853,206,939 | +$35,594,675,580 | $192.60 | 698 |
| 2020 Q1 | 27,276,244 | $4,501,660,418 | +$4,500,378,509 | $165.03 | 91 |