Aon
AON · NYSE
Who owns AON
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 40.1% of AON’s shares.
- Vanguard Capital Management, LLC6.4%
- Capital World Investors5.5%
- BlackRock Institutional Trust Company, N.A.4.8%
- State Street Investment Management (US)4.4%
- Next 6 largest institutions19.0%
- All other shareholders59.9%
| Holder | Shares | % of shares |
|---|---|---|
| Vanguard Capital Management, LLC | 13.60M | 6.41% |
| Capital World Investors | 11.71M | 5.52% |
| BlackRock Institutional Trust Company, N.A. | 10.17M | 4.80% |
| State Street Investment Management (US) | 9.42M | 4.44% |
| JP Morgan Asset Management | 9.04M | 4.26% |
| Dodge & Cox | 8.59M | 4.05% |
| MFS Investment Management | 7.22M | 3.40% |
| Vanguard Portfolio Management, LLC | 7.20M | 3.40% |
| Geode Capital Management, L.L.C. | 5.18M | 2.44% |
| Morgan Stanley Investment Management Ltd. (UK) | 2.97M | 1.40% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Vanguard Total Stock Market Index Fund | 6.46M | 3.05% |
| Vanguard 500 Index Fund | 5.61M | 2.64% |
| Dodge & Cox Stock Fund | 3.68M | 1.74% |
| American Funds American Balanced Fund | 3.33M | 1.57% |
| iShares Core S&P 500 ETF | 2.85M | 1.34% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders bought $6.55M (6 trades) and sold $1.66M (7 trades) of AON on the open market.
| Insider | Type | Shares | Value |
|---|---|---|---|
| KNIGHT LESTER B | Buy | 367 | $121.30K |
| KNIGHT LESTER B | Buy | 1.44K | $474.75K |
| KNIGHT LESTER B | Buy | 4.14K | $1.36M |
| KNIGHT LESTER B | Buy | 7.21K | $2.36M |
| KNIGHT LESTER B | Buy | 5.10K | $1.66M |
| KNIGHT LESTER B | Buy | 1.74K | $566.27K |
| Zeidel Darren | Sale | 475 | $180.50K |
| Zeidel Darren | Sale | 725 | $274.05K |
| Zeidel Darren | Sale | 700 | $263.20K |
| Zeidel Darren | Sale | 675 | $252.45K |
Congressional trades
Disclosed by members of Congress over the last 12 months
| Member | Type | Amount | Traded |
|---|---|---|---|
| Michael McCaulHouse | Sale | $15K–$50K | Apr 6, 2026 |
| Alan ArmstrongSenator | Purchase | $1K–$15K | Mar 27, 2026 |
| Michael McCaulHouse | Sale | $15K–$50K | Mar 25, 2026 |
| Michael McCaulHouse | Sale | $15K–$50K | Mar 12, 2026 |
| Michael McCaulHouse | Sale | $15K–$50K | Mar 4, 2026 |
| Ro KhannaHouse | Purchase | $1K–$15K | Nov 3, 2025 |
| Michael McCaulHouse | Sale | $1K–$15K | Oct 27, 2025 |
| Ro KhannaHouse | Purchase | $1K–$15K | Oct 21, 2025 |
Short interest
Settled Sep 30, 2026
- Shares short
- 4.22M
- Days to cover
- 1.76
- % of shares outstanding
- 1.99%
- Average daily volume
- 2.40M
- Change since last report
- +14.3%
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