Aon PLC AON
$334.81 −$9.59 (-2.78%)
Pre-market · Nov 9, 4:50 am ET · After hours $334.81 0.00%
Open$333.62
Prev close$344.40
Day range$332.12 – $338.81
Volume977.9K
Market cap$71.03B
P/E (TTM)18.3
Dividend yield0.93%
Ownership & positioning
Who holds it, who is betting against it, and where the big money is moving
Institutional ownership90.7%-1.58 pts vs. prior quarter
Institutions holding1,454-53 vs. prior quarter
Insider trades (recent)21 buys / 27 sellsNet selling
Short interest1.60% of floatDays to cover 2.0 · as of 15 Oct 2026
Short-sale volume share21.9%5-day average of daily volume
Short-sale volume as % of daily volume
Large-order net flow, last 20 sessions
Net of large-order buying minus selling, in USD. Over this window: −$105.95M (6 inflow days, 14 outflow days).
Net flow by order size, last 20 sessions
Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.
The five largest holders on file together own 29.8% of shares outstanding.
Largest holders
By investor type
Reported short interest has fallen from 2.32% to 1.60% of float over the last 6 biweekly reports (31 Jul 2026 to 15 Oct 2026).
Recent institutional activity
| Holder | Type | Period | Share change | New stake |
|---|---|---|---|---|
| J.P. Morgan Asset Management, Inc. | Mutual Fund | 2026/Q3 | +5,565,974 | 5.0% |
| Vanguard Portfolio Management, LLC | Mutual Fund | 2026/Q3 | +2,643,956 | 3.4% |
| T. Rowe Price Group, Inc. | Mutual Fund | 2026/Q3 | +1,855,329 | 1.5% |
| Arrowstreet Capital, Limited Partnership | Mutual Fund | 2026/Q3 | +1,817,336 | 1.2% |
| JPMorgan Chase & Co. | Public Company | 2026/Q3 | +955,722 | 0.8% |
| AQR Capital Management | Hedge Fund | 2026/Q3 | +907,969 | 0.9% |
| PineStone Asset Management Inc. | Mutual Fund | 2026/Q3 | +683,624 | 0.4% |
| Dodge & Cox | Mutual Fund | 2026/Q3 | +477,049 | 4.1% |
| Millennium Management LLC | Hedge Fund | 2026/Q3 | +292,222 | 0.1% |
| Mitsubishi UFJ Asset Management | Mutual Fund | 2026/Q3 | +237,276 | 1.3% |
| Capital Research | Mutual Fund | 2026/Q3 | +216,462 | 6.0% |
| Artisan Partners Limited Partnership | Mutual Fund | 2026/Q3 | +206,471 | 0.9% |
| State Street Global Advisors | Mutual Fund | 2026/Q3 | +196,266 | 4.4% |
| Comgest S.A. | Mutual Fund | 2026/Q3 | +191,570 | 0.4% |
| The Goldman Sachs Group, Inc. | Public Company | 2026/Q3 | +182,227 | 0.3% |
Institutional buy/sell activity by reporting period, largest moves first.
Insider transactions
| Date | Insider | Title | Transaction | Shares | Price | Held after |
|---|---|---|---|---|---|---|
| 1 Sep 2026 | Lester Knight | Independent Non-Executive Chairperson | Open Market Acquisition | +20,000 | $330.51 | 318,864 |
| 16 Aug 2026 | Nadin Virani | Interim Chief Financial Officer | Initial Statement of Beneficial | +0 | – | 2,010 |
| 27 Jul 2026 | Darren Zeidel | Executive VP, General Counsel & Company Secretary | Automatic Disposition | -1,900 | $380.00 | 11,504 |
| 16 Jul 2026 | Darren Zeidel | Executive VP, General Counsel & Company Secretary | Automatic Disposition | -1,950 | $374.00 | 13,404 |
| 6 Jul 2026 | Darren Zeidel | Executive VP, General Counsel & Company Secretary | Automatic Disposition | -600 | $360.00 | 15,354 |
| 30 Jun 2026 | Edmund Reese | Senior Advisor | Derivative Exercise and Sale | -2,198 | $343.56 | 3,901 |
| 30 Jun 2026 | Edmund Reese | Senior Advisor | Derivative Exercise and Retained | +1,776 | – | 3,901 |
| 24 Jun 2026 | Richard Notebaert | Independent Non-Executive Director | Sale to Issuer | -186 | $315.95 | 28,328 |
| 24 Jun 2026 | Richard Notebaert | Independent Non-Executive Director | Other Acquisition | +776 | – | 28,328 |
| 24 Jun 2026 | Lester Knight | Independent Non-Executive Chairperson | Other Acquisition | +1,488 | – | 326,739 |
| 24 Jun 2026 | Cheryl Francis | Independent Non-Executive Director | Sale to Issuer | -186 | $315.95 | 29,294 |
| 24 Jun 2026 | Cheryl Francis | Independent Non-Executive Director | Other Acquisition | +776 | – | 29,294 |
| 24 Jun 2026 | Gloria Santona | Independent Non-Executive Director | Sale to Issuer | -186 | $315.95 | 40,198 |
| 24 Jun 2026 | Gloria Santona | Independent Non-Executive Director | Other Acquisition | +776 | – | 40,198 |
| 24 Jun 2026 | Jeffrey Campbell | Independent Director | Sale to Issuer | -186 | $315.95 | 12,621 |
| 24 Jun 2026 | Jeffrey Campbell | Independent Director | Other Acquisition | +776 | – | 12,621 |
| 24 Jun 2026 | Sarah Elisabeth Smith | Independent Director | Sale to Issuer | -186 | $315.95 | 2,127 |
| 24 Jun 2026 | Sarah Elisabeth Smith | Independent Director | Other Acquisition | +776 | – | 2,127 |
| 24 Jun 2026 | Jose Alvarez | Independent Director | Sale to Issuer | -372 | $315.95 | 1,270 |
| 24 Jun 2026 | Jose Alvarez | Independent Director | Other Acquisition | +776 | – | 1,270 |
From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.
Short interest, by report
| Report date | Shares short | % of float | Days to cover |
|---|---|---|---|
| 15 Oct 2026 | 3,394,895 | 1.6% | 2.0 |
| 30 Sep 2026 | 4,223,243 | 2.0% | 1.8 |
| 15 Sep 2026 | 3,695,919 | 1.7% | 1.8 |
| 31 Aug 2026 | 3,780,451 | 1.8% | 4.4 |
| 14 Aug 2026 | 3,368,629 | 1.6% | 3.6 |
| 31 Jul 2026 | 4,919,769 | 2.3% | 3.1 |
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