| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 4.6% | $3,628,370,330 | 9,832,449 | Massachusetts Financial Services Company | 31 Mar 2025 |
As of 30 Sep 2025, 1,224 institutional investors reported holding 185,526,900 shares of Aon plc - Class A Ordinary Shares (AON). This represents 87% of the company’s total 213,748,891 outstanding shares.
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 |
|---|---|---|---|---|---|
| VANGUARD GROUP INC | 9.3% | 19,979,391 | -1.5% | 0.11% | $7,124,251,244 |
| BlackRock, Inc. | 7.4% | 15,846,586 | -0.53% | 0.1% | $5,650,575,693 |
| Capital World Investors | 5.6% | 12,076,697 | -0.56% | 0.59% | $4,306,285,230 |
| STATE STREET CORP | 4.3% | 9,229,464 | +1.2% | 0.11% | $3,291,047,763 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 4.1% | 8,757,686 | -2.2% | 0.97% | $3,122,815,673 |
| MORGAN STANLEY | 2.9% | 6,136,386 | -35% | 0.13% | $2,188,114,114 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.4% | 5,113,297 | -8.5% | 0.12% | $1,818,651,090 |
| Berkshire Hathaway Inc | 1.9% | 4,100,000 | 0% | 0.55% | $1,461,978,000 |
| Bank of New York Mellon Corp | 1.7% | 3,715,346 | +5.9% | 0.24% | $1,324,818,079 |
| Dodge & Cox | 1.6% | 3,464,683 | 0.67% | $1,235,436,664 | |
| JPMORGAN CHASE & CO | 1.6% | 3,347,197 | -29% | 0.08% | $1,193,559,822 |
| Mawer Investment Management Ltd. | 1.2% | 2,498,089 | -16% | 4.6% | $890,768,575 |
| POLEN CAPITAL MANAGEMENT LLC | 1.2% | 2,490,167 | -9.3% | 2.9% | $887,943,817 |
| NEUBERGER BERMAN GROUP LLC | 1.1% | 2,330,363 | +12% | 0.61% | $830,945,128 |
| EAGLE CAPITAL MANAGEMENT LLC | 1.1% | 2,284,151 | -0% | 2.6% | $814,482,459 |
| FARALLON CAPITAL MANAGEMENT LLC | 1.1% | 2,278,017 | +15% | 4.6% | $812,295,302 |
| NORTHERN TRUST CORP | 1% | 2,213,069 | -2.5% | 0.1% | $789,136,144 |
| Independent Franchise Partners LLP | 0.98% | 2,096,486 | +42% | 4.9% | $747,564,977 |
| Veritas Asset Management LLP | 0.96% | 2,053,673 | +19% | 7.8% | $732,298,718 |
| WCM INVESTMENT MANAGEMENT, LLC | 0.95% | 2,037,843 | -0.12% | 1.5% | $722,659,938 |
| Mitsubishi UFJ Asset Management Co., Ltd. | 0.85% | 1,823,442 | -33% | 0.47% | $650,202,948 |
| Capital International Investors | 0.82% | 1,756,457 | +3.1% | 0.1% | $626,179,147 |
| Boston Partners | 0.8% | 1,711,250 | +16% | 0.63% | $610,986,080 |
| DIAMOND HILL CAPITAL MANAGEMENT INC | 0.73% | 1,563,821 | -0.68% | 2.6% | $557,627,314 |
| BANK OF AMERICA CORP /DE/ | 0.67% | 1,435,375 | +0.8% | 0.04% | $511,825,955 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 1,660,954 | $586,150,333 | -$77,866,381 | $352.88 | 142 |
| 2025 Q3 | 185,526,900 | $66,150,450,907 | -$1,434,183,815 | $356.58 | 1,224 |
| 2025 Q2 | 193,803,967 | $69,114,264,150 | +$824,711,598 | $356.76 | 1,210 |
| 2025 Q1 | 191,337,542 | $76,157,107,092 | -$83,326,111 | $399.09 | 1,247 |
| 2024 Q4 | 191,455,806 | $68,735,086,508 | +$954,798,883 | $359.16 | 1,159 |
| 2024 Q3 | 188,073,316 | $65,080,627,001 | +$558,686,877 | $345.99 | 1,129 |
| 2024 Q2 | 188,258,393 | $55,265,347,636 | +$5,487,508,523 | $293.58 | 1,088 |
| 2024 Q1 | 169,760,726 | $56,621,289,519 | -$402,876,324 | $333.72 | 1,064 |
| 2023 Q4 | 2,669,908 | $776,995,060 | -$215,654,607 | $291.02 | 17 |
| 2023 Q3 | 171,827,728 | $55,702,643,549 | -$1,094,080,241 | $324.22 | 1,011 |
| 2023 Q2 | 173,047,631 | $59,669,362,090 | -$40,304,459 | $345.20 | 992 |
| 2023 Q1 | 175,198,061 | $55,228,386,866 | +$492,395,335 | $315.29 | 977 |
| 2022 Q4 | 173,592,685 | $52,108,394,659 | -$1,266,876,198 | $300.14 | 999 |
| 2022 Q3 | 176,956,954 | $47,429,763,994 | -$894,415,364 | $267.87 | 908 |
| 2022 Q2 | 180,154,632 | $48,558,795,138 | -$909,118,366 | $269.68 | 917 |
| 2022 Q1 | 184,848,467 | $60,174,704,164 | +$175,214,234 | $325.63 | 943 |
| 2021 Q4 | 184,427,547 | $55,396,909,157 | -$3,350,936,259 | $300.56 | 955 |
| 2021 Q3 | 198,148,375 | $56,605,325,819 | -$6,387,651,439 | $285.77 | 878 |
| 2021 Q2 | 221,517,229 | $52,876,724,884 | +$380,435,247 | $238.76 | 873 |
| 2021 Q1 | 219,164,131 | $50,415,503,929 | -$93,128,804 | $230.11 | 872 |
| 2020 Q4 | 219,563,811 | $46,350,475,624 | +$358,703,486 | $211.27 | 817 |
| 2020 Q3 | 219,272,724 | $45,224,231,188 | +$1,516,033,811 | $206.30 | 759 |
| 2020 Q2 | 210,567,077 | $40,544,042,243 | +$35,277,792,184 | $192.60 | 688 |
| 2020 Q1 | 27,273,353 | $4,501,184,418 | +$4,501,068,741 | $165.04 | 90 |
| 2019 Q4 | 16,467 | $3,739,228 | +$53,531 | $208.29 | 5 |
| 2019 Q3 | 16,210 | $3,596,743 | +$1,053,408 | $193.57 | 5 |
| 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 | $0 | $137.17 | 2 |
| 2018 Q1 | 589 | $82,654 | $0 | $140.33 | 2 |
| 2017 Q4 | 589 | $78,926 | $0 | $134.00 | 2 |
| 2017 Q3 | 589 | $86,053 | $0 | $146.10 | 2 |
| 2017 Q2 | 589 | $78,307 | $0 | $132.95 | 2 |
| 2017 Q1 | 589 | $69,908 | $0 | $118.69 | 2 |
| 2016 Q4 | 589 | $65,691 | $0 | $111.53 | 2 |
| 2016 Q3 | 76 | $8,549 | $0 | $112.49 | 1 |
| 2016 Q2 | 76 | $8,301 | $0 | $109.22 | 1 |
| 2016 Q1 | 76 | $7,938 | $0 | $104.45 | 1 |