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Smart Money Score
Composite context from Form 4, 13F and congressional disclosures; not a forecast.
Of the 16 tracked institutions holding AON, 10 have a 3-year clone track record — 7 of them beat the S&P. Average holder's clone alpha: +1.2pt. It's a gauge of who owns the name, not just how many.
Among the 16 tracked institutional investors we monitor, AON (AON PLC) is held with a combined value of $18.28B across 53,846,160 shares. The largest holder is VANGUARD GROUP INC with a position worth $7.12B (0.10% of their portfolio). Fisher Asset Management, LLC opened a new position in the most recent quarter. 10 funds increased their holdings. 4 funds reduced their position.
Total Institutional Value
$18.28B
Total Shares Held
53,846,160
Institutional Holders
16
% of Shares Outstanding
25.4%
of 212.13M shares · SEC 2026-07-28
Days to Cover
3.6-31.5%
3.37M shares short · FINRA 2026-08-14
Tracked 13F institutions hold 25.4% 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 2026-07-28), not a live float.
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
6
$6.55M
5
$1.17M
Total Transactions
11
Last 12 months
| Date | Insider | Code | Type | Shares | Value |
|---|---|---|---|---|---|
| Sep 2, 2026 | LESTER B KNIGHT | P | Purchase | 7,212 | $2.36M |
| Sep 2, 2026 | LESTER B KNIGHT | P | Purchase | 4,145 | $1.36M |
| Sep 2, 2026 | LESTER B KNIGHT | P | Purchase | 1,440 | $474.75K |
| Sep 2, 2026 | LESTER B KNIGHT | P | Purchase | 1,739 | $566.27K |
| Sep 2, 2026 | LESTER B KNIGHT | P | Purchase | 367 | $121.30K |
| Sep 2, 2026 | LESTER B KNIGHT | P | Purchase | 5,097 | $1.66M |
| Jul 28, 2026 | Darren Zeidel | S | Sale | 725 | $274.05K |
| Jul 28, 2026 | Darren Zeidel | S | Sale | 475 | $180.50K |
| Jul 28, 2026 | Darren Zeidel | S | Sale | 700 | $263.20K |
| Jul 17, 2026 | Darren Zeidel | S | Sale | 625 | $231.25K |
Showing 10 of 11 transactions
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | VANGUARD GROUP INC | $7.12B | 0.10% | +1.0% |
| 2 | BlackRock, Inc. | $5.21B | 0.08% | -2.7% |
| 3 | STATE STREET CORP | $3.12B | 0.09% | +2.1% |
| 4 | PRICE T ROWE ASSOCIATES INC /MD/ | $1.04B | 0.10% | +144.9% |
| 5 | AQR CAPITAL MANAGEMENT LLC | $623.01M | 0.22% | +94.5% |
| 6 | VIKING GLOBAL INVESTORS LP | $381.86M | 1.09% | +5.9% |
| 7 | BAUPOST GROUP LLC/MA | $227.87M | 4.21% | -10.7% |
| 8 | FMR LLC | $182.88M | 0.01% | +5.4% |
| 9 | ADAGE CAPITAL PARTNERS GP, L.L.C. | $126.16M | 0.18% | +71.2% |
| 10 | MILLENNIUM MANAGEMENT LLC | $103.55M | 0.07% | +450.8% |
| 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, 16 institutional investors hold AON with a combined value of $18.28B.
In the most recent quarter, 1 fund opened a new position in AON. Additionally, 10 increased their holdings and 4 reduced their positions.
Institutional investors hold $18.28B worth of AON stock across 16 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
$304.69
2026-09-09
YTD
-11.5%
0% of 52-week range
