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
1,232
Shares (Excl. Options)
187,473,201
Price
$322.78
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- Type / Class
- Equity / Class A Ordinary Shares
- Symbol
- AON on NYSE
- Shares outstanding
- 213,748,891
- Price per share
- $321.14
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 187,473,201
- Total reported value
- $60,569,567,983
- % of total 13F portfolios
- 0.04%
- Share change
- -1,688,793
- Value change
- -$773,497,658
- Number of holders
- 1,232
- Price from insider filings
- $321.14
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Key facts
- AON - Aon plc - Class A Ordinary Shares is tracked under CUSIP G0403H108.
- 1232 institutions reported positions in Q1 2026.
- 1 significant owner is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 1,268 to 1,232 between Q4 2025 and Q1 2026.
- Reported value moved from $66,601,748,445 to $60,569,567,983.
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 1232 institutions filings for Q1 2026.
Security key
G0403H108
Latest holder period
Q1 2026
13F holders
1,232
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:
Significant Owners of Aon plc - Class A Ordinary Shares (AON) based on Schedule 13D/G filings
| 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, 1,232 institutional investors reported holding 187,473,201 shares of Aon plc - Class A Ordinary Shares (AON). This represents 88% of the company’s total 213,748,891 outstanding shares.
Top 25 Institutional Shareholders
The largest institutional shareholders of Aon plc - Class A Ordinary Shares (AON) together control 56% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| 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 |
Institutional Holders of Aon plc - Class A Ordinary Shares (AON) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 187,473,201 | $60,569,567,983 | -$773,497,658 | $322.78 | 1,232 |
| 2025 Q4 | 188,819,577 | $66,601,748,445 | +$1,018,525,054 | $352.88 | 1,268 |
| 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 |
| 2019 Q4 | 16,467 | $3,739,228 | +$53,531 | $208.29 | 5 |
| 2019 Q3 | 19,042 | $4,576,587 | +$1,053,408 | $193.57 | 6 |
| 2019 Q2 | 10,768 | $2,542,981 | +$772 | $192.98 | 3 |
| 2019 Q1 | 10,764 | $2,528,908 | +$1,366 | $170.70 | 3 |
| 2018 Q4 | 589 | $85,617 | -$12,000 | $145.36 | 2 |
| 2018 Q3 | 664 | $102,576 | +$12,000 | $153.78 | 3 |
| 2018 Q2 | 589 | $80,793 | $137.17 | 2 | |
| 2018 Q1 | 589 | $82,654 | $140.33 | 2 | |
| 2017 Q4 | 589 | $78,926 | $134.00 | 2 | |
| 2017 Q3 | 589 | $86,053 | $146.10 | 2 | |
| 2017 Q2 | 589 | $78,307 | $132.95 | 2 | |
| 2017 Q1 | 589 | $69,908 | $118.69 | 2 | |
| 2016 Q4 | 589 | $65,691 | $111.53 | 2 | |
| 2016 Q3 | 76 | $8,549 | $112.49 | 1 | |
| 2016 Q2 | 76 | $8,301 | $109.22 | 1 | |
| 2016 Q1 | 76 | $7,938 | $104.45 | 1 |