Latest Period
Q4 2025
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
1,265
Shares (Excl. Options)
188,685,813
Price
$352.88
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- Type / Class
- Equity / Class A Ordinary Shares
- Symbol
- AON on NYSE
- Shares outstanding
- 213,748,891
- Price per share
- $325.40
- All holders as of 31 Dec 2025
- Q4 2025
- Total 13F shares
- 188,685,813
- Total reported value
- $66,554,545,977
- % of total 13F portfolios
- 0.04%
- Share change
- +2,902,414
- Value change
- +$1,022,333,518
- Number of holders
- 1,265
- Price from insider filings
- $325.40
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Quick Takeaways
- AON - Aon plc - Class A Ordinary Shares is tracked under CUSIP G0403H108.
- 1265 institutions reported positions in Q4 2025.
- 1 significant owner is listed from Schedule 13D/13G reporting.
What Changed
- Holder count moved from 1,265 to 435 between Q4 2025 and Q1 2026.
- Reported value moved from $66,554,545,977 to $2,219,537,038.
Why This Matters
- 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.
Source Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 1265 institutions filings for Q4 2025.
Investment Quick Answers
What is CUSIP G0403H108?
CUSIP G0403H108 identifies AON - Aon plc - Class A Ordinary Shares in SEC 13F datasets.
Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.
Next ownership checks
Use the next link that matches the question you still need to answer about this security.
- Latest 13F filings when you want to inspect fresh institutional portfolio moves.
- Latest Schedule 13D/13G reports when you need large-owner changes outside the 13F cycle.
- All institutional ownership pages to compare this security with other holder-history pages.
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 Dec 2025, 1,265 institutional investors reported holding 188,685,813 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 58% 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 |
|---|---|---|---|---|---|
| VANGUARD GROUP INC | 9.4% | 20,171,049 | +0.96% | 0.1% | $7,117,959,771 |
| BlackRock, Inc. | 7.6% | 16,236,934 | +2.5% | 0.1% | $5,729,689,450 |
| Capital World Investors | 5.7% | 12,252,904 | +1.5% | 0.59% | $4,323,850,187 |
| STATE STREET CORP | 4.3% | 9,203,973 | -0.28% | 0.11% | $3,247,903,482 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 4% | 8,545,036 | -2.4% | 0.97% | $3,015,372,303 |
| Dodge & Cox | 3.7% | 7,852,456 | +127% | 1.5% | $2,770,974,673 |
| MORGAN STANLEY | 2.6% | 5,570,506 | -9.2% | 0.12% | $1,965,721,026 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.4% | 5,141,363 | +0.55% | 0.11% | $1,810,725,639 |
| Berkshire Hathaway Inc | 1.7% | 3,602,995 | -12% | 0.46% | $1,271,424,876 |
| Bank of New York Mellon Corp | 1.6% | 3,479,061 | -6.4% | 0.22% | $1,227,690,862 |
| NORGES BANK | 1.5% | 3,275,848 | 0.12% | $1,155,981,242 | |
| JPMORGAN CHASE & CO | 1.5% | 3,192,216 | -4.6% | 0.08% | $1,126,469,628 |
| FARALLON CAPITAL MANAGEMENT LLC | 1.2% | 2,665,238 | +17% | 5.4% | $940,509,185 |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | 1.1% | 2,415,006 | +8948% | 0.75% | $852,207,318 |
| EAGLE CAPITAL MANAGEMENT LLC | 1.1% | 2,269,414 | -0.65% | 2.5% | $800,830,660 |
| Independent Franchise Partners LLP | 0.99% | 2,115,523 | +0.91% | 4.7% | $746,525,756 |
| NORTHERN TRUST CORP | 0.98% | 2,099,652 | -5.1% | 0.09% | $740,925,198 |
| Veritas Asset Management LLP | 0.93% | 1,992,453 | -3% | 7.2% | $703,096,815 |
| WCM INVESTMENT MANAGEMENT, LLC | 0.93% | 1,986,128 | -2.5% | 1.5% | $708,034,853 |
| POLEN CAPITAL MANAGEMENT LLC | 0.86% | 1,846,294 | -26% | 2.8% | $651,520,305 |
| Mitsubishi UFJ Asset Management Co., Ltd. | 0.85% | 1,812,888 | -0.58% | 0.42% | $624,122,952 |
| NEUBERGER BERMAN GROUP LLC | 0.84% | 1,804,303 | -23% | 0.47% | $636,733,167 |
| Boston Partners | 0.76% | 1,635,007 | -4.5% | 0.6% | $576,316,555 |
| DIAMOND HILL CAPITAL MANAGEMENT INC | 0.75% | 1,596,315 | +2.1% | 2.9% | $563,307,659 |
| Mawer Investment Management Ltd. | 0.69% | 1,477,693 | -41% | 2.9% | $521,448,306 |
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 | 6,880,208 | $2,219,537,038 | +$51,532,398 | $322.78 | 435 |
| 2025 Q4 | 188,685,813 | $66,554,545,977 | +$1,022,333,518 | $352.88 | 1,265 |
| 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 |