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Closing prices for September 17, 2026
The series is stated in the current share scale after splits; dividends are not included in the price
| Date | Open | High | Low | Close | Volume, shares |
|---|---|---|---|---|---|
| September 17, 2026 | 299.54 | 302.12 | 295.78 | 296.05 | 3m |
| September 16, 2026 | 303.40 | 304.06 | 298.48 | 300.57 | 3m |
| September 15, 2026 | 311.60 | 311.98 | 304.59 | 304.67 | 2m |
| September 14, 2026 | 308.08 | 312.39 |
Based on reports through December 31, 2025
Aon is an insurance broker and risk adviser: it places other people's risk for a commission without taking it on.
A broker selects cover for a corporate client, negotiates terms with insurers and handles claims. Commission is proportional to the premium, so rising insurance prices raise the broker's income without raising its own risk.
Beyond insurance the company advises on pension programmes, workforce matters and reinsurance. Serving large corporations requires expertise that cannot be reproduced quickly, and changing broker is a rare decision, so the client base is stable.
Risks: a softening insurance market where premiums and commissions fall, competition for talent, and integrating large acquisitions. The company pays a dividend and buys back stock actively.
Address:15 GEORGES QUAY, DUBLIN 2, D02 VR98, IE
| 130m |
| BROBrown & Brown, Inc. | 65.12 | −1.15 % | 123m |
| ARXAccelerant Holdings | 19.82 | −0.10 % | 99m |
| BWINThe Baldwin Insurance Group, Inc. | 31.98 | −20.30 % | 85m |
| ERIEErie Indemnity Company | 242.59 | −121.80 % | 70m |
| 305.92 |
| 311.54 |
| 3m |
| September 11, 2026 | 310.85 | 311.89 | 302.44 | 302.69 | 2m |
| September 10, 2026 | 304.97 | 310.04 | 304.20 | 307.77 | 2m |
| September 09, 2026 | 313.45 | 315.67 | 303.59 | 304.69 | 2m |
| September 08, 2026 | 316.78 | 321.57 | 314.95 | 315.79 | 2m |
| September 04, 2026 | 328.18 | 328.84 | 321.49 | 323.09 | 1m |
| September 03, 2026 | 332.00 | 336.45 | 325.68 | 327.00 | 1m |
| September 02, 2026 | 327.70 | 331.60 | 324.79 | 330.88 | 2m |
| September 01, 2026 | 321.42 | 328.52 | 312.92 | 326.30 | 2m |
| August 31, 2026 | 340.00 | 343.26 | 320.21 | 321.52 | 2m |
| August 28, 2026 | 350.96 | 358.71 | 349.76 | 355.40 | 669,100 |
| August 27, 2026 | 350.51 | 352.88 | 348.03 | 349.56 | 688,200 |
| August 26, 2026 | 354.63 | 356.46 | 353.19 | 353.98 | 594,200 |
| August 25, 2026 | 357.00 | 360.30 | 354.14 | 354.83 | 616,300 |
| August 24, 2026 | 358.52 | 361.73 | 356.50 | 359.10 | 627,200 |
| August 21, 2026 | 352.39 | 356.86 | 350.57 | 355.11 | 747,000 |
| August 20, 2026 | 348.90 | 356.12 | 346.32 | 351.93 | 733,300 |