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Of the 17 tracked institutions holding AON, 11 have a 3-year clone track record — 8 of them beat the S&P. Average holder's clone alpha: +2.6pt. It's a gauge of who owns the name, not just how many.
Among the 17 tracked institutional investors we monitor, AON (AON PLC) is held with a combined value of $17.04B across 50,919,549 shares. The largest holder is VANGUARD GROUP INC with a position worth $7.12B (0.10% of their portfolio). 2 funds opened new positions in the most recent quarter. 9 funds increased their holdings. 6 funds reduced their position.
Total Institutional Value
$17.04B
Total Shares Held
50,919,549
Institutional Holders
17
% of Shares Outstanding
23.8%
of 213.58M shares · SEC 2026-04-30
Days to Cover
1.6+2.9%
3.70M shares short · FINRA 2026-06-30
Tracked 13F institutions hold 23.8% of AON's shares outstanding. This is a floor: 13F filings arrive on a ~45-day lag and we track only a subset of institutional filers, so true institutional ownership is higher. Shares-outstanding is the latest SEC cover-page figure (as of 2026-04-30), not a live float.
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
0
$0
2
$447.25K
Total Transactions
2
Last 12 months
| Date | Insider | Code | Type | Shares | Value |
|---|---|---|---|---|---|
| Jul 17, 2026 | Darren Zeidel | S | Sale | 625 | $231.25K |
| Jul 7, 2026 | Darren Zeidel | S | Sale | 600 | $216.00K |
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | VANGUARD GROUP INC | $7.12B | 0.10% | +1.0% |
| 2 | BlackRock, Inc. | $5.21B | 0.09% | -0.5% |
| 3 | STATE STREET CORP | $2.98B | 0.10% | +0.2% |
| 4 | PRICE T ROWE ASSOCIATES INC /MD/ | $413.46M | 0.05% | +121.5% |
| 5 | VIKING GLOBAL INVESTORS LP | $350.90M | 0.98% | +38.7% |
| 6 | AQR CAPITAL MANAGEMENT LLC | $316.25M | 0.14% | +127.8% |
| 7 | BAUPOST GROUP LLC/MA | $248.22M | 4.85% | New |
| 8 | FMR LLC | $168.87M | 0.01% | -61.0% |
| 9 | ADAGE CAPITAL PARTNERS GP, L.L.C. | $71.71M | 0.11% | -63.4% |
| 10 | MARKEL GROUP INC. | $43.83M | 0.37% | +1.3% |
| Member | Type | Date |
|---|---|---|
| Alan Armstrong | Buy | Mar 27, 2026 |
| Thomas H. Jr. Kean | Buy | May 27, 2025 |
| Jefferson Shreve | Sell | May 8, 2025 |
| Kathy Manning | Sell |
As of the latest SEC 13F filings, VANGUARD GROUP INC is the largest institutional holder of AON with a position worth $7.12B, representing 0.10% of their portfolio. In total, 17 institutional investors hold AON with a combined value of $17.04B.
In the most recent quarter, 2 funds opened a new position in AON. Additionally, 9 increased their holdings and 6 reduced their positions.
Institutional investors hold $17.04B worth of AON stock across 17 positions. The largest institutional holder is VANGUARD GROUP INC with $7.12B in holdings.
A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For AON, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.
Get notified when hedge funds change their AON positions.
Alpha = the manager's 3-year clone return minus the S&P 500. A skilled roster is a stronger tell than a crowded one — though even skilled managers' edge doesn't reliably survive the 13F disclosure lag. Why →
| Jul 2, 2024 |
| Kathy Manning | Sell | Jul 2, 2024 |
| Thomas H. Jr. Kean | Buy | May 6, 2024 |
| Kathy Manning | Buy | Jan 23, 2024 |
| Susan M Collins | Sell | Oct 31, 2018 |
Last Close
$361.70
2026-07-24
YTD
+5.1%
80% of 52-week range
