| 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, 1,235 institutional investors reported holding 188,425,919 shares of Aon plc - Class A Ordinary Shares (AON). This represents 88% of the company’s total 213,748,891 outstanding shares.
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 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 188,425,919 | $66,455,170,152 | +$1,014,701,022 | $352.88 | 1,235 |
| 2025 Q3 | 185,576,801 | $66,168,243,732 | -$1,426,822,164 | $356.58 | 1,232 |
| 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 |