Who owns Aon (AON)
Which tracked institutional funds hold AON, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See AON company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
294 tracked funds added or opened AON while 274 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
AON’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.1% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 0.0pp gap the other way — the median holder sizes AON more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in AON divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 1192 tracked filers holding AON, 578 increased or opened the position and 630 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in AON between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 42
- PineStone Asset Management Inc.$265M
- MARSHALL WACE, LLP$15M
- Weiss Asset Management LP$13M
- VAN ECK ASSOCIATES CORP$11M
- HAWK RIDGE CAPITAL MANAGEMENT LP$10M
- NISSAY ASSET MANAGEMENT CORP /JAPAN$9M
Full exits 112
- Amundi$485M
- Cantillon Capital Management LLC$354M
- Southpoint Capital Advisors LP$161M
- C WorldWide Group Holding A/S$129M
- NATIXIS ADVISORS, LLC$110M
- Prana Capital Management, LP$104M
Largest adds
- JPMORGAN CHASE & CO$2.2B
- VANGUARD PORTFOLIO MANAGEMENT LLC$918M
- PRICE T ROWE ASSOCIATES INC /MD/$627M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$610M
- BlackRock, Inc.$484M
- AQR CAPITAL MANAGEMENT LLC$307M
Largest trims
- UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC$399M
- POLEN CAPITAL MANAGEMENT LLC$383M
- FARALLON CAPITAL MANAGEMENT, L.L.C.$352M
- Sustainable Growth Advisers, LP$259M
- DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main$203M
- MASSACHUSETTS FINANCIAL SERVICES CO /MA/$177M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 15,716,429 | $5.2B | 9.1% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 13,603,465 | $4.5B | 7.9% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 12,175,974 | $4.0B | 7.0% | 2026-Q2 |
| Capital World Investors added | 11,711,650 | $3.9B | 6.8% | 2026-Q2 |
| STATE STREET CORP added | 9,416,039 | $3.1B | 5.5% | 2026-Q2 |
| DODGE & COX added | 8,593,144 | $2.9B | 5.0% | 2026-Q2 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ trimmed | 7,615,397 | $2.6B | 4.5% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 7,202,991 | $2.4B | 4.2% | 2026-Q2 |
| MORGAN STANLEY trimmed | 6,214,787 | $2.1B | 3.6% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 5,180,553 | $1.7B | 3.0% | 2026-Q2 |
| Bank of New York Mellon Corp trimmed | 3,191,212 | $1.1B | 1.8% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 3,136,640 | $1.0B | 1.8% | 2026-Q2 |
| NORGES BANK added | 2,796,760 | $928M | 1.6% | 2026-Q2 |
| Mitsubishi UFJ Asset Management Co., Ltd. added | 2,753,913 | $913M | 1.6% | 2026-Q2 |
| Independent Franchise Partners LLP added | 2,646,943 | $878M | 1.5% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 2,614,754 | $867M | 1.5% | 2026-Q2 |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main trimmed | 2,255,768 | $748M | 1.3% | 2026-Q2 |
| Boston Partners added | 2,089,773 | $696M | 1.2% | 2026-Q2 |
| NORTHERN TRUST CORP trimmed | 2,040,534 | $677M | 1.2% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 1,905,800 | $623M | 1.1% | 2026-Q2 |
| WCM INVESTMENT MANAGEMENT, LLC trimmed | 1,875,859 | $614M | 1.1% | 2026-Q2 |
| Artisan Partners Limited Partnership added | 1,850,623 | $614M | 1.1% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 1,748,801 | $580M | 1.0% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC trimmed | 1,691,729 | $561M | 1.0% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 1,624,970 | $539M | 0.9% | 2026-Q2 |
| Veritas Asset Management LLP trimmed | 1,408,111 | $467M | 0.8% | 2026-Q2 |
| FARALLON CAPITAL MANAGEMENT, L.L.C. trimmed | 1,382,562 | $459M | 0.8% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 1,345,367 | $446M | 0.8% | 2026-Q2 |
| Legal & General Group Plc trimmed | 1,288,852 | $427M | 0.7% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 1,240,634 | $411M | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO trimmed | 1,190,449 | $395M | 0.7% | 2026-Q2 |
| Mawer Investment Management Ltd. trimmed | 1,171,624 | $389M | 0.7% | 2026-Q2 |
| VIKING GLOBAL INVESTORS LP added | 1,151,269 | $382M | 0.7% | 2026-Q2 |
| LAZARD ASSET MANAGEMENT LLC trimmed | 1,122,874 | $372M | 0.7% | 2026-Q2 |
| Diamond Hill Capital Management, LLC (Investment Advisor) trimmed | 1,114,156 | $370M | 0.6% | 2026-Q2 |
| Invesco Ltd. trimmed | 1,069,331 | $355M | 0.6% | 2026-Q2 |
| Nuveen, LLC added | 878,682 | $291M | 0.5% | 2026-Q2 |
| UBS Group AG trimmed | 822,267 | $273M | 0.5% | 2026-Q2 |
| COMGEST GLOBAL INVESTORS S.A.S. added | 820,270 | $272M | 0.5% | 2026-Q2 |
| PineStone Asset Management Inc. new | 799,293 | $265M | 0.5% | 2026-Q2 |
| Capital International Investors trimmed | 793,989 | $263M | 0.5% | 2026-Q2 |
| Longview Partners (Guernsey) LTD trimmed | 768,975 | $255M | 0.4% | 2026-Q2 |
| FIL Ltd added | 753,981 | $250M | 0.4% | 2026-Q2 |
| Wealthspire Advisors, LLC trimmed | 726,424 | $241M | 0.4% | 2026-Q2 |
| Focus Partners Wealth added | 706,903 | $234M | 0.4% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 692,802 | $230M | 0.4% | 2026-Q2 |
| BAUPOST GROUP LLC/MA trimmed | 687,000 | $228M | 0.4% | 2026-Q2 |
| Meritage Group LP added | 684,518 | $227M | 0.4% | 2026-Q2 |
| First Pacific Advisors, LP trimmed | 681,367 | $226M | 0.4% | 2026-Q2 |
| ALTRINSIC GLOBAL ADVISORS LLC trimmed | 646,424 | $214M | 0.4% | 2026-Q2 |
| DEUTSCHE BANK AG\ trimmed | 585,041 | $194M | 0.3% | 2026-Q2 |
| Swiss National Bank trimmed | 574,100 | $190M | 0.3% | 2026-Q2 |
| ROYAL BANK OF CANADA trimmed | 554,705 | $184M | 0.3% | 2026-Q2 |
| FMR LLC added | 551,367 | $183M | 0.3% | 2026-Q2 |
| Vontobel Holding Ltd. trimmed | 540,802 | $179M | 0.3% | 2026-Q2 |
| USS Investment Management Ltd added | 520,768 | $173M | 0.3% | 2026-Q2 |
| National Pension Service added | 484,892 | $161M | 0.3% | 2026-Q2 |
| Vanguard Global Advisers, LLC trimmed | 460,517 | $153M | 0.3% | 2026-Q2 |
| Sumitomo Mitsui Trust Group, Inc. added | 453,213 | $150M | 0.3% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 446,333 | $148M | 0.3% | 2026-Q2 |
| Fiera Capital Corp trimmed | 419,313 | $139M | 0.2% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 408,838 | $136M | 0.2% | 2026-Q2 |
| Douglass Winthrop Advisors, LLC added | 400,635 | $133M | 0.2% | 2026-Q2 |
| BARCLAYS PLC trimmed | 394,135 | $131M | 0.2% | 2026-Q2 |
| FRANKLIN RESOURCES INC added | 389,485 | $129M | 0.2% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 388,097 | $129M | 0.2% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 385,948 | $128M | 0.2% | 2026-Q2 |
| Verition Fund Management LLC added | 385,028 | $128M | 0.2% | 2026-Q2 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. added | 380,369 | $126M | 0.2% | 2026-Q2 |
| JONES FINANCIAL COMPANIES LLLP added | 375,514 | $123M | 0.2% | 2026-Q2 |
| California Public Employees Retirement System trimmed | 370,835 | $123M | 0.2% | 2026-Q2 |
| BLAIR WILLIAM & CO/IL trimmed | 360,607 | $120M | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 360,106 | $119M | 0.2% | 2026-Q2 |
| Cryder Capital Partners LLP added | 352,191 | $117M | 0.2% | 2026-Q2 |
| HSBC HOLDINGS PLC trimmed | 351,616 | $117M | 0.2% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC trimmed | 337,900 | $112M | 0.2% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN trimmed | 336,918 | $112M | 0.2% | 2026-Q2 |
| DAVENPORT & Co LLC trimmed | 336,307 | $111M | 0.2% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 312,198 | $104M | 0.2% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 306,798 | $102M | 0.2% | 2026-Q2 |
| Haverford Trust Co trimmed | 296,930 | $98M | 0.2% | 2026-Q2 |
| BANK OF MONTREAL /CAN/ trimmed | 283,011 | $94M | 0.2% | 2026-Q2 |
| BRISTOL JOHN W & CO INC /NY/ trimmed | 279,586 | $93M | 0.2% | 2026-Q2 |
| AVIVA PLC trimmed | 267,360 | $89M | 0.2% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 260,063 | $86M | 0.2% | 2026-Q2 |
| Bowie Capital Management, LLC trimmed | 250,021 | $83M | 0.1% | 2026-Q2 |
| BloombergSen Inc. trimmed | 245,318 | $81M | 0.1% | 2026-Q2 |
| Sustainable Growth Advisers, LP trimmed | 242,284 | $80M | 0.1% | 2026-Q2 |
| CITIGROUP INC trimmed | 233,032 | $77M | 0.1% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND trimmed | 229,832 | $76M | 0.1% | 2026-Q2 |
| Scharf Investments, LLC trimmed | 226,626 | $75M | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP trimmed | 225,133 | $75M | 0.1% | 2026-Q2 |
| WEITZ INVESTMENT MANAGEMENT, INC. | 213,860 | $71M | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. trimmed | 207,271 | $67M | 0.1% | 2026-Q2 |
| Ensign Peak Advisors, Inc trimmed | 206,469 | $68M | 0.1% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC trimmed | 204,967 | $68M | 0.1% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. trimmed | 198,061 | $66M | 0.1% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT CO LTD added | 195,089 | $65M | 0.1% | 2026-Q2 |
| Assenagon Asset Management S.A. added | 188,821 | $63M | 0.1% | 2026-Q2 |
| NICHOLAS COMPANY, INC. added | 181,267 | $60M | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.