Who owns AON
Institutions that file 13Fs hold 91% of the shares
Shares they hold, quarter on quarter
+2.8%
137 new, 437 added, 424 cut, 136 sold out
Top 10 holders
51%
of the shares institutions hold
A 13F lists the long positions of managers with more than $100M in US stocks. It shows the last day of a quarter and is filed up to 45 days later. Two managers can report the same shares, so totals can count some shares twice.
Two kinds of filings agree
Smart money agrees
13F: Dodge & Cox added +6%, Andreas Halvorsen added +6%, Jensen Investment added +1%, Yacktman added +2% in the quarter ending Jun 30, 2026.
Form 4: KNIGHT LESTER B (Director) bought $6.5M in the open market since 2026-04-01.
Institutional owners
The 25 biggest holders
| Holder | Shares | Value | % of company | From Mar 31, 2026 |
|---|---|---|---|---|
| BlackRock, Inc. | 15.72M | $5.2B | 7.41% | Reduced -2.7% |
| VANGUARD CAPITAL MANAGEMENT LLC | 13.60M | $4.5B | 6.41% | Held |
| JPMORGAN CHASE & CO | 12.18M | $4.0B | 5.74% | Added +115.8% |
| Capital World Investors | 11.71M | $3.9B | 5.52% | Added +2.0% |
| STATE STREET CORP | 9.42M | $3.1B | 4.44% | Added +2.1% |
| Dodge & Cox | 8.59M | $2.9B | 4.05% | Added +5.9% |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 7.62M | $2.6B | 3.59% | Reduced -8.9% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 7.20M | $2.4B | 3.40% | Added +58.0% |
| MORGAN STANLEY | 6.21M | $2.1B | 2.93% | Reduced -2.5% |
| GEODE CAPITAL MANAGEMENT, LLC | 5.18M | $1.7B | 2.44% | Reduced -1.2% |
| Bank of New York Mellon Corp | 3.19M | $1.1B | 1.50% | Reduced -3.9% |
| PRICE T ROWE ASSOCIATES INC /MD/ | 3.14M | $1.0M | 1.48% | Added +144.9% |
| NORGES BANK | 2.80M | $927.7M | 1.32% | New |
| Mitsubishi UFJ Asset Management Co., Ltd. | 2.75M | $913.4M | 1.30% | Added +9.4% |
| Independent Franchise Partners LLP | 2.65M | $878.0M | 1.25% | Added +2.3% |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 2.61M | $867.3M | 1.23% | Added +227.9% |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | 2.26M | $748.2M | 1.06% | Reduced -23.5% |
| Boston Partners | 2.09M | $695.8M | 0.99% | Added +6.9% |
| NORTHERN TRUST CORP | 2.04M | $676.8M | 0.96% | Reduced -2.0% |
| AQR CAPITAL MANAGEMENT LLC | 1.91M | $623.0M | 0.90% | Added +94.5% |
| WCM INVESTMENT MANAGEMENT, LLC | 1.88M | $614.5M | 0.88% | Reduced -3.9% |
| Artisan Partners Limited Partnership | 1.85M | $613.8M | 0.87% | Added +12.6% |
| GOLDMAN SACHS GROUP INC | 1.75M | $580.1M | 0.82% | Added +10.4% |
| NEUBERGER BERMAN GROUP LLC | 1.69M | $561.1M | 0.80% | Reduced -8.9% |
| BANK OF AMERICA CORP /DE/ | 1.62M | $539.0M | 0.77% | Added +2.7% |
Show the other 15 holders
This quarter
Who bought and who sold the most shares
Bought the most shares
- JPMORGAN CHASE & CO +6.53M
- NORGES BANK +2.80M, new
- VANGUARD PORTFOLIO MANAGEMENT LLC +2.64M
- PRICE T ROWE ASSOCIATES INC /MD/ +1.86M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP +1.82M
- AQR CAPITAL MANAGEMENT LLC +926K
- PineStone Asset Management Inc. +799K, new
- Dodge & Cox +477K
- Assenagon Asset Management S.A. +369K
- MILLENNIUM MANAGEMENT LLC +292K
Sold the most shares
- UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC -1.24M
- POLEN CAPITAL MANAGEMENT LLC -1.19M
- FARALLON CAPITAL MANAGEMENT, L.L.C. -1.13M
- Cantillon Capital Management LLC -1.10M, sold out
- Sustainable Growth Advisers, LP -810K
- MASSACHUSETTS FINANCIAL SERVICES CO /MA/ -743K
- DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main -693K
- Amundi -509K
- Southpoint Capital Advisors LP -500K, sold out
- Vontobel Holding Ltd. -458K
Superinvestors
Superinvestors holding AON
| Investor | Quarter | Shares | Value | % of portfolio | Last quarter |
|---|---|---|---|---|---|
| Dodge & Cox Dodge & Cox | Jun 30, 2026 | 8.59M | $2.9B | 1.53% | Added +5.9% |
| Andreas Halvorsen Viking Global Investors | Jun 30, 2026 | 1.15M | $381.9M | 1.09% | Added +5.9% |
| Seth Klarman Baupost Group | Jun 30, 2026 | 687K | $227.9M | 4.62% | Reduced -10.7% |
| Wally Weitz Weitz Investment Management | Jun 30, 2026 | 214K | $70.9M | 5.26% | Held |
| Polen Capital Polen Capital Management | Jun 30, 2026 | 164K | $54.4M | 0.50% | Reduced -87.9% |
| Tom Gayner Markel Group | Sep 30, 2026 | 136K | $37.6M | 0.32% | Held |
| Jensen Investment Jensen Investment Management | Jun 30, 2026 | 26K | $8.6M | 0.21% | Added +0.9% |
| Yacktman Yacktman Asset Management | Sep 30, 2026 | 13K | $3.6M | 0.04% | Added +1.9% |
Sold out last quarter: William von Mueffling
More than 5%
13D filings: owners who may push for change
No Schedule 13D about AON in the last year.