Aon Plc (AON) Institutional Shareholders
Aon Plc (AON) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $57.55B in AON holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of AON tracked by InsiderSet, reporting ownership valued at approximately $5.21B in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $5.82B, representing an estimated gain of +11.70% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 49% of the total disclosed AON value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Vanguard Capital Management Llc, Capital World Investors, and several other long-term asset managers with concentrated positions in Aon Plc (AON).
This page ranks the largest institutional AON shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
1,238
Total Reported Value
$57.55B
Largest Holder
Blackrock, Inc.
Largest Position
$5.21B
Insider Transactions (90d)
32
Latest Filing Quarter
Q2 2026
New Institutional Positions
41
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.09% | 16,148,507 | $5,212,414,954 | $5,822,344,199 | +$609,929,245 | +11.70% | |
| Vanguard Capital Management Llc | 0.11% | 13,581,756 | $4,383,919,201 | $4,896,902,126 | +$512,982,925 | +11.70% | |
| Capital World Investors | 0.51% | 11,477,788 | $3,704,816,237 | $4,138,316,463 | +$433,500,226 | +11.70% | |
| State Street Corp | 0.10% | 9,219,773 | $2,976,090,171 | $3,324,189,155 | +$348,098,984 | +11.70% | |
| Massachusetts Financial Services Co | 0.93% | 8,358,097 | $2,752,001,161 | $3,013,511,873 | +$261,510,712 | +9.50% | |
| Dodge & Cox Stock Fund | V. D. Dodge, E. M. Cox | 1.44% | 8,116,095 | $2,619,713,144 | $2,926,258,052 | +$306,544,908 | +11.70% |
| Morgan Stanley | 0.12% | 6,374,945 | $2,057,706,214 | $2,298,486,420 | +$240,780,206 | +11.70% | |
| Geode Capital Management, Llc | 0.10% | 5,244,309 | $1,685,913,492 | $1,890,835,610 | +$204,922,118 | +12.15% | |
| Vanguard Portfolio Management Llc | 0.08% | 4,559,035 | $1,471,565,317 | $1,643,760,069 | +$172,194,752 | +11.70% | |
| Bank Of New York Mellon Corp | 0.20% | 3,321,092 | $1,071,981,874 | $1,197,419,721 | +$125,437,847 | +11.70% | |
| Dz Bank Ag Deutsche Zentral Genossenschafts Bank, Frankfurt Am Main | 0.87% | 2,948,410 | $951,687,779 | $1,063,049,226 | +$111,361,447 | +11.70% | |
| Independent Franchise Partners Llp | 5.85% | 2,588,002 | $835,355,285 | $933,104,121 | +$97,748,836 | +11.70% | |
| Mitsubishi Ufj Asset Management Co., Ltd. | 0.55% | 2,516,637 | $812,320,091 | $907,373,470 | +$95,053,379 | +11.70% | |
| Farallon Capital Management Llc | 5.29% | 2,512,638 | $811,029,294 | $905,931,631 | +$94,902,337 | +11.70% | |
| Northern Trust Corp | 0.09% | 2,082,105 | $672,061,851 | $750,702,958 | +$78,641,107 | +11.70% | |
| Wcm Investment Management, Llc | 1.44% | 1,952,379 | $632,688,017 | $703,930,248 | +$71,242,231 | +11.26% | |
| Boston Partners | 0.66% | 1,955,032 | $631,082,064 | $704,886,788 | +$73,804,724 | +11.69% | |
| Neuberger Berman Group Llc | 0.46% | 1,857,834 | $599,684,142 | $669,842,049 | +$70,157,907 | +11.70% | |
| Storebrand Asset Management As | 0.19% | 2,069,881 | $581,009,732 | $746,295,595 | +$165,285,863 | +28.45% | |
| Artisan Partners Limited Partnership | 0.87% | 1,644,152 | $530,699,383 | $592,799,004 | +$62,099,621 | +11.70% | |
| Goldman Sachs Group Inc | 0.07% | 1,583,991 | $511,280,502 | $571,107,955 | +$59,827,453 | +11.70% | |
| Bank Of America Corp | 0.04% | 1,582,680 | $510,857,447 | $570,635,274 | +$59,777,827 | +11.70% | |
| Veritas Asset Management Llp | 8.31% | 1,520,277 | $490,715,010 | $548,135,872 | +$57,420,862 | +11.70% | |
| Amundi | 0.13% | 1,502,890 | $485,102,834 | $541,866,990 | +$56,764,156 | +11.70% | |
| Diamond Hill Capital Management Inc | 3.00% | 1,487,887 | $480,260,195 | $536,457,658 | +$56,197,463 | +11.70% | |
| Invesco Ltd. | 0.07% | 1,486,623 | $479,852,213 | $536,001,923 | +$56,149,710 | +11.70% | |
| Charles Schwab Investment Management Inc | 0.07% | 1,355,094 | $437,397,241 | $488,579,142 | +$51,181,901 | +11.70% | |
| Polen Capital Management | David M. Polen | 3.02% | 1,354,053 | $437,061,344 | $488,203,809 | +$51,142,465 | +11.70% |
| Legal & General Group Plc | 0.10% | 1,341,222 | $432,919,639 | $483,577,592 | +$50,657,953 | +11.70% | |
| Mawer Investment Management Ltd. | 2.67% | 1,277,088 | $412,218,465 | $460,454,078 | +$48,235,613 | +11.70% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.08% | 1,262,123 | $407,388,062 | $455,058,448 | +$47,670,386 | +11.70% | |
| Dimensional Fund Advisors Lp | 0.08% | 1,253,769 | $404,709,376 | $452,046,413 | +$47,337,037 | +11.70% | |
| Vanguard Fiduciary Trust Co | 0.10% | 1,225,563 | $395,587,225 | $441,876,740 | +$46,289,515 | +11.70% | |
| Lazard Asset Management Llc | 0.65% | 1,217,243 | $392,901,583 | $438,876,964 | +$45,975,381 | +11.70% | |
| Viking Global Investors | Ole Andreas Halvorsen | 0.98% | 1,087,114 | $350,898,657 | $391,958,953 | +$41,060,296 | +11.70% |
| Ameriprise Financial Inc | 0.08% | 1,080,672 | $348,828,968 | $389,636,290 | +$40,807,322 | +11.70% | |
| Sustainable Growth Advisers, Lp | 3.20% | 1,051,805 | $339,501,618 | $379,228,293 | +$39,726,675 | +11.70% | |
| Vontobel Holding Ltd. | 1.11% | 999,176 | $322,514,029 | $360,252,907 | +$37,738,878 | +11.70% | |
| Wealthspire Advisors, Llc | 2.49% | 984,075 | $317,639,641 | $354,808,241 | +$37,168,600 | +11.70% | |
| Aqr Capital Management Llc | 0.14% | 979,755 | $316,245,097 | $353,250,665 | +$37,005,568 | +11.70% | |
| Longview Partners (Guernsey) Ltd | 4.46% | 976,263 | $315,118,171 | $351,991,625 | +$36,873,454 | +11.70% | |
| Ubs Group Ag | 0.05% | 903,928 | $291,769,880 | $325,911,240 | +$34,141,360 | +11.70% | |
| Nuveen, Llc | 0.07% | 851,081 | $274,711,763 | $306,857,255 | +$32,145,492 | +11.70% | |
| Comgest Global Investors S.A.S. | 5.99% | 820,270 | $272,075,356 | $295,748,349 | +$23,672,993 | +8.70% | |
| Pinestone Asset Management Inc. | 1.64% | 799,293 | $265,117,495 | $288,185,091 | +$23,067,596 | +8.70% | |
| Capital International Investors | 0.06% | 807,075 | $260,599,344 | $290,990,891 | +$30,391,547 | +11.66% | |
| Arrowstreet Capital, Limited Partnership | 0.14% | 797,418 | $257,390,582 | $287,509,060 | +$30,118,478 | +11.70% | |
| Fil Ltd | 0.19% | 745,959 | $240,780,646 | $268,955,517 | +$28,174,871 | +11.70% | |
| First Pacific Advisors, Lp | 3.18% | 703,258 | $226,997,617 | $253,559,672 | +$26,562,055 | +11.70% | |
| Royal Bank Of Canada | 0.04% | 688,130 | $222,115,000 | $248,105,272 | +$25,990,272 | +11.70% |
Frequently asked questions about AON
Who owns the most AON stock?
The largest holders of AON are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for Aon Plc (AON).
Is AON widely held by superinvestors?
Many widely followed stocks like AON appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly AON is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.