Aon PLC
Ownership
Ownership Structure
Who owns Aon PLC (AON)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 98.7% of the shares are freely tradable; institutional investors hold 92.0%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 7.41 | 15,716,429 | -2.7 | 06/30/2026 |
| Vanguard Capital Management, LLC | 6.41 | 13,603,465 | +0.2 | 06/30/2026 |
| JPMorgan Chase & Co | 5.74 | 12,175,974 | +115.8 | 06/30/2026 |
| Capital World Investors | 5.52 | 11,711,650 | +2.0 | 06/30/2026 |
| State Street Corp | 4.44 | 9,416,039 | +2.1 | 06/30/2026 |
| Dodge & Cox | 4.05 | 8,593,144 | +5.9 | 06/30/2026 |
| Massachusetts Financial Services Company | 3.59 | 7,615,397 | -8.9 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 3.40 | 7,202,991 | +58.0 | 06/30/2026 |
| Morgan Stanley - Brokerage Accounts | 2.93 | 6,214,787 | -2.5 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 3.18 | 6,736,771 | +4.5 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Knight Lester B | Director | 163,000 | 52,469,700 $ | Sep 2, 2026 | indirect |
| Zeidel Darren | General Counsel | 11,504 | 3,703,169 $ | Jul 28, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 2, 2026 | Knight Lester B | Director | Buy | 367 | 330.51 | 121,297 |
| Sep 2, 2026 | Knight Lester B | Director | Buy | 1,440 | 329.69 | 474,754 |
| Sep 2, 2026 | Knight Lester B | Director | Buy | 4,145 | 328.34 | 1,360,969 |
| Sep 2, 2026 | Knight Lester B | Director | Buy | 7,212 | 327.52 | 2,362,074 |
| Sep 2, 2026 | Knight Lester B | Director | Buy | 5,097 | 326.53 | 1,664,323 |
| Sep 2, 2026 | Knight Lester B | Director | Buy | 1,739 | 325.63 | 566,271 |
| Jul 28, 2026 | Zeidel Darren | General Counsel | Sell | 475 | 380.00 | 180,500 |
| Jul 28, 2026 | Zeidel Darren | General Counsel | Sell | 725 | 378.00 | 274,050 |
| Jul 28, 2026 | Zeidel Darren | General Counsel | Sell | 700 | 376.00 | 263,200 |
| Jul 17, 2026 | Zeidel Darren | General Counsel | Sell | 675 | 374.00 | 252,450 |
| Jul 17, 2026 | Zeidel Darren | General Counsel | Sell | 650 | 372.00 | 241,800 |
| Jul 17, 2026 | Zeidel Darren | General Counsel | Sell | 625 | 370.00 | 231,250 |
| Jul 7, 2026 | Zeidel Darren | General Counsel | Sell | 600 | 360.00 | 216,000 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: October 30, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.