Commercial Risk Solutions was Aon’s largest segment in fiscal 2025, bringing in $8.50B of $17.20B (49%).
| Segment | FY 2017 | FY 2018 | FY 2019 | FY 2020 | FY 2021 | FY 2022 | FY 2023 | FY 2024 | FY 2025 |
|---|---|---|---|---|---|---|---|---|---|
| Commercial Risk Solutions | $6.72B | $7.04B | $7.86B | $8.50B | |||||
| Health Solutions | $2.22B | $2.43B | $3.34B | $3.84B | |||||
| Reinsurance Solutions | $2.19B | $2.48B | $2.66B | $2.79B | |||||
| Retirement Solutions | — | — | — | — | |||||
| Wealth Solutions | $1.37B | $1.43B | $1.87B | $2.07B | |||||
| Data Analytic Services | — | — | — | — | |||||
| Total | $12.50B | $13.39B | $15.73B | $17.20B |
Aon brought in $17.20B from its four segments in fiscal 2025, the year ended December 31, 2025. That was up 9.4% from $15.73B in fiscal 2024. Commercial Risk Solutions was the largest at $8.50B (49.4%), ahead of Health Solutions at $3.84B (22.3%) and Reinsurance Solutions at $2.79B (16.2%). The remaining segment, Wealth Solutions, brought in $2.07B.
Compared with fiscal 2024, Health Solutions grew fastest, up 15.1% to $3.84B. Every segment above 2% of revenue grew. From fiscal 2022 to 2025, combined revenue from these segments grew from $12.50B to $17.20B, a compound annual growth rate of 11.2%. Commercial Risk Solutions' share of the total fell from 53.7% to 49.4%.
U.S was Aon’s largest region in fiscal 2021, bringing in $5.46B of $12.19B (45%).
| Geography | FY 2008 | FY 2009 | FY 2010 | FY 2011 | FY 2012 | FY 2013 | FY 2014 | FY 2017 | FY 2018 | FY 2019 | FY 2020 | FY 2021 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| U.S | $4.68B | $5.02B | $5.03B | $5.46B | ||||||||
| United States | — | — | — | — | ||||||||
| Revenues | — | — | — | — | ||||||||
| Total Revenue | — | — | — | — | ||||||||
| Europe, Middle East, &Amp; Africa Other Than U.K. & Ireland | — | — | — | $2.57B | ||||||||
| Europe, Middle East, Africa Other Than U.K. & Ireland | $2.33B | $2.26B | $2.24B | — | ||||||||
| Europe, Middle East, Africa Other Than United Kingdom | — | — | — | — | ||||||||
| Europe, Middle East & Africa | — | — | — | — | ||||||||
| U.K | $1.56B | $1.50B | $1.58B | $1.68B | ||||||||
| United Kingdom | — | — | — | — | ||||||||
| Asia Pacific | $1.19B | $1.24B | $1.22B | $1.33B | ||||||||
| Americas Other Than U.S | $940.00M | $919.00M | $911.00M | $1.03B | ||||||||
| Ireland | $80.00M | $75.00M | $84.00M | $127.00M | ||||||||
| Total | $10.77B | $11.01B | $11.07B | $12.19B |
Aon brought in $12.19B from its six regions in fiscal 2021, the year ended December 31, 2021. Aon regrouped these regions after fiscal 2020, so the total does not compare directly with that year's $11.07B. U.S was the largest at $5.46B (44.8%), ahead of Europe, Middle East, &Amp; Africa Other Than U.K. & Ireland at $2.57B (21.0%) and U.K at $1.68B (13.8%). The other three regions brought in $2.49B combined.
Compared with fiscal 2020, Americas Other Than U.S grew fastest, up 12.7% to $1.03B. Every region above 2% of revenue grew.
Aon began breaking out Europe, Middle East, &Amp; Africa Other Than U.K. & Ireland in fiscal 2021, when it brought in $2.57B. Aon stopped reporting Europe, Middle East, Africa Other Than U.K. & Ireland as a separate region after fiscal 2020, when it brought in $2.24B.
Calculated Under Revenue Guidance In Effect Before Topic 606 was Aon’s largest revenue line in fiscal 2018, bringing in $10.71B of $10.65B (101%).
| Initial Application Period Cumulative Effect Transition | FY 2018 |
|---|---|
| Calculated Under Revenue Guidance In Effect Before Topic 606 | $10.71B |
| Difference Between Revenue Guidance In Effect Before & After Topic 606 | -$61.00M |
| Total | $10.65B |
Aon brought in $10.65B from its two revenue lines in fiscal 2018, the year ended December 31, 2018. Calculated Under Revenue Guidance In Effect Before Topic 606 was the largest at $10.71B (100.6%).
The total is net of Difference Between Revenue Guidance In Effect Before & After Topic 606, which took $61.00M off revenue in fiscal 2018.
Aon (AON) reports its revenue by segment, by geography and by initial application period cumulative effect transition. In fiscal 2025, Commercial Risk Solutions was its largest segment, bringing in $8.50B (49.4% of the total), followed by Health Solutions at $3.84B (22.3%).
Commercial Risk Solutions was Aon's largest segment in fiscal 2025, bringing in $8.50B, or 49.4% of the $17.20B total across its four segments.
U.S was Aon's largest region in fiscal 2021, bringing in $5.46B, or 44.8% of the $12.19B total across its six regions.
Calculated Under Revenue Guidance In Effect Before Topic 606 was Aon's largest revenue line in fiscal 2018, bringing in $10.71B, or 100.6% of the $10.65B total across its two revenue lines.
Among Aon's segments that make up at least 2% of revenue, Health Solutions grew fastest in fiscal 2025, up 15.1% from $3.34B to $3.84B.
Every figure comes from Aon's annual financial filings, as reported. Each line keeps the name Aon gives it, and years follow its fiscal calendar.
Aon's revenue by segment goes back to fiscal 2017, with figures through fiscal 2025. The latest four fiscal years are free to view, and the full history is available with a Business Quant subscription.