Aon plc (AON) Ownership
AON ownership summary
as of October 18, 2026- Institutions
- 93.0% of shares outstanding
- Insiders
- 1.01% of shares outstanding
- Shares outstanding
- 212.1M
- Float
- 209.3M shares available to trade
- Short interest
- 2.01% 4.2M shares short
- Days to cover
- 1.86 short interest up 11.7% vs prior month
- Institutions 92.96%
- Insiders 1.01%
- Other investors 6.03%
AON top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 7.41% | 15.7M | $4.60B | −432,078 (−2.7%) | June 30, 2026 |
| 2 | Vanguard Capital Management, LLC | 6.41% | 13.6M | $3.98B | +21,709 (+0.2%) | June 30, 2026 |
| 3 | JPMorgan Chase & Co | 5.74% | 12.2M | $3.56B | +6.5M (+115.8%) | June 30, 2026 |
| 4 | Capital World Investors | 5.52% | 11.7M | $3.43B | +233,862 (+2.0%) | June 30, 2026 |
| 5 | State Street Corp | 4.44% | 9.4M | $2.75B | +196,266 (+2.1%) | June 30, 2026 |
| 6 | Dodge & Cox | 4.05% | 8.6M | $2.51B | +477,049 (+5.9%) | June 30, 2026 |
| 7 | Massachusetts Financial Services Company | 3.59% | 7.6M | $2.23B | −742,700 (−8.9%) | June 30, 2026 |
| 8 | Vanguard Portfolio Management, LLC | 3.40% | 7.2M | $2.11B | +2.6M (+58.0%) | June 30, 2026 |
| 9 | Morgan Stanley - Brokerage Accounts | 2.93% | 6.2M | $1.82B | −160,158 (−2.5%) | June 30, 2026 |
| 10 | Geode Capital Management, LLC | 2.44% | 5.2M | $1.52B | −63,756 (−1.2%) | June 30, 2026 |
| 11 | Bank of New York Mellon Corp | 1.50% | 3.2M | $933.6M | −129,880 (−3.9%) | June 30, 2026 |
| 12 | T. Rowe Price Associates, Inc. | 1.48% | 3.1M | $917.6M | +1.9M (+144.9%) | June 30, 2026 |
| 13 | NORGES BANK | 1.32% | 2.8M | $818.2M | −479,088 (−14.6%) | June 30, 2026 |
| 14 | Mitsubishi UFJ Asset Management Co.,Ltd | 1.30% | 2.8M | $805.7M | +237,276 (+9.4%) | June 30, 2026 |
| 15 | Independent Franchise Partners LLP | 1.25% | 2.6M | $774.4M | +58,941 (+2.3%) | June 30, 2026 |
| 16 | Arrowstreet Capital Limited Partnership | 1.23% | 2.6M | $764.9M | +1.8M (+227.9%) | June 30, 2026 |
| 17 | DZ BANK AG Deutsche Zentral-Genossenschaftsbank Frankfurt am Main | 1.06% | 2.3M | $659.9M | −692,642 (−23.5%) | June 30, 2026 |
| 18 | Boston Partners Global Investors, Inc | 0.99% | 2.1M | $611.4M | +134,741 (+6.9%) | June 30, 2026 |
| 19 | Northern Trust Corp | 0.96% | 2.0M | $597.0M | −41,571 (−2.0%) | June 30, 2026 |
| 20 | AQR Capital Management LLC | 0.90% | 1.9M | $557.5M | +926,045 (+94.5%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 12 holders added 15.1M shares and 8 cut 2.7M.
AON top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 3.04% | 6.4M | $1.89B | −12,900 (−0.2%) | August 31, 2026 |
| 2 | Vanguard 500 Index Investor | 2.63% | 5.6M | $1.63B | −102,795 (−1.8%) | September 30, 2026 |
| 3 | Vanguard MStar Mid Cap Index Instl | 2.14% | 4.5M | $1.33B | +2.3M (+107.0%) | September 30, 2026 |
| 4 | Dodge & Cox Stock I | 1.74% | 3.7M | $1.08B | — | June 30, 2026 |
| 5 | American Funds American Balanced A | 1.57% | 3.3M | $975.6M | — | September 30, 2026 |
| 6 | iShares Core S&P 500 ETF | 1.33% | 2.8M | $826.9M | −4,551 (−0.2%) | September 30, 2026 |
| 7 | Fidelity 500 Index | 1.31% | 2.8M | $811.1M | +10,656 (+0.4%) | August 31, 2026 |
| 8 | State Street® SPDR® S&P 500® ETF | 1.22% | 2.6M | $760.0M | — | September 30, 2026 |
| 9 | Dodge & Cox International Stock I | 1.20% | 2.6M | $746.9M | +303,800 (+13.5%) | June 30, 2026 |
| 10 | Vanguard MStar Value Index Investor | 0.95% | 2.0M | $591.2M | +80,350 (+4.1%) | September 30, 2026 |
| 11 | MFS Value A | 0.93% | 2.0M | $574.6M | −152,120 (−7.2%) | August 31, 2026 |
| 12 | Putnam Large Cap Value A | 0.85% | 1.8M | $528.8M | — | August 31, 2026 |
| 13 | American Funds Washington Mutual A | 0.82% | 1.7M | $510.6M | — | September 30, 2026 |
| 14 | State Street®FinSelSectSPDR®ETF | 0.68% | 1.4M | $419.9M | −9,075 (−0.6%) | September 30, 2026 |
| 15 | Vanguard MStar Mid Cap Value ETF | 0.62% | 1.3M | $387.5M | +667,623 (+101.7%) | September 30, 2026 |
| 16 | MS INVF Global Brands A | 0.57% | 1.2M | $355.9M | −33,086 (−2.6%) | August 31, 2026 |
| 17 | Vanguard Dividend Appreciation ETF | 0.57% | 1.2M | $351.1M | −8,853 (−0.7%) | September 30, 2026 |
| 18 | Vanguard Institutional Index I | 0.53% | 1.1M | $328.2M | −19,667 (−1.7%) | September 30, 2026 |
| 19 | JPMorgan Equity Premium Income ETF | 0.51% | 1.1M | $318.0M | +680 (+0.1%) | September 30, 2026 |
| 20 | American Funds EUPAC A | 0.48% | 1.0M | $299.5M | — | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
AON insider transactions
latest 2| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-02-17 | Darren Zeidel | Sell | $325.79 | 5,040 | $1.6M |
| 2026-02-10 | Lester B Knight | Buy | $319.24 | 4,000 | $1.3M |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
AON shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns AON
Institutional investors own 93.0% of Aon's shares and insiders 1.01%. The largest holder is BlackRock Inc with 7.41% of the shares (15.7M), as of June 30, 2026. Among the top 20 institutions, 12 added shares and 8 reduced their stake in the latest filings. Short interest is 2.01% of the float, or 1.86 days of average trading volume. The share count fell 26.2% since 2014.
Related: AON analyst forecast, AON key metrics, AON dividend history. See the AON stock overview for the latest quote and news.
AON ownership FAQ
Who owns the most Aon stock?
The largest shareholders of Aon are BlackRock Inc (7.41%), Vanguard Capital Management, LLC (6.41%), JPMorgan Chase & Co (5.74%), Capital World Investors (5.52%), State Street Corp (4.44%).
What percentage of Aon is owned by institutions?
Institutions hold 93.0% of Aon's shares outstanding; insiders hold 1.01%.
Which funds own Aon?
The largest fund holders of Aon are Vanguard MStar Total Stk Mkt Idx Invest (3.04%), Vanguard 500 Index Investor (2.63%), Vanguard MStar Mid Cap Index Instl (2.14%), Dodge & Cox Stock I (1.74%), American Funds American Balanced A (1.57%).
What is Aon's short interest?
4.2M shares of Aon were sold short, 2.01% of the float; at the average daily volume it would take 1.86 days to cover.
Are insiders buying or selling Aon?
Of the latest 2 reported insider transactions in Aon (since February 10, 2026), 1 were purchases and 1 were sales.
How many shares of Aon are outstanding?
Aon has 212.1M shares outstanding, of which 209.3M are in the public float.