Other was Icon’s largest revenue line in fiscal 2025, bringing in $2.97B of $8.25B (36%).
| Customer | FY 2018 | FY 2019 | FY 2020 | FY 2021 | FY 2022 | FY 2023 | FY 2024 | FY 2025 |
|---|---|---|---|---|---|---|---|---|
| Other | $2.85B | $2.99B | $3.08B | $2.97B | ||||
| Clients 11-25 | $1.59B | $1.75B | $1.76B | $2.07B | ||||
| Clients 2-5 | $1.51B | $1.45B | $1.42B | $1.47B | ||||
| Clients 6-10 | $1.11B | $1.17B | $1.29B | $1.16B | ||||
| Top Client | $683.55M | $704.03M | $641.66M | $576.27M | ||||
| Total | $7.74B | $8.05B | $8.19B | $8.25B |
Icon brought in $8.25B from its five revenue lines in fiscal 2025, the year ended December 31, 2025. That was up 0.8% from $8.19B in fiscal 2024. Other was the largest at $2.97B (36.0%), ahead of Clients 11-25 at $2.07B (25.1%) and Clients 2-5 at $1.47B (17.8%). The other two revenue lines brought in $1.74B combined.
Compared with fiscal 2024, Clients 11-25 grew fastest, up 17.8% to $2.07B, while Top Client fell the most, down 10.2% to $576.27M. From fiscal 2022 to 2025, combined revenue from these revenue lines grew from $7.74B to $8.25B, a compound annual growth rate of 2.1%. Other's share of the total fell from 36.9% to 36.0%.
Ireland was Icon’s largest region in fiscal 2025, bringing in $3.18B of $8.25B (39%).
| Geography | FY 2016 | FY 2017 | FY 2018 | FY 2019 | FY 2020 | FY 2021 | FY 2022 | FY 2023 | FY 2024 | FY 2025 |
|---|---|---|---|---|---|---|---|---|---|---|
| United States | $3.57B | $3.28B | $2.98B | $2.52B | ||||||
| Ireland | $1.98B | $2.32B | $2.70B | $3.18B | ||||||
| Rest Of Europe | $1.62B | $1.57B | $1.56B | $1.59B | ||||||
| Rest Of World | — | $884.50M | $942.64M | $951.90M | ||||||
| Other | $563.86M | — | — | — | ||||||
| Total | $7.74B | $8.05B | $8.19B | $8.25B |
Icon brought in $8.25B from its four regions in fiscal 2025, the year ended December 31, 2025. That was up 0.8% from $8.19B in fiscal 2024. Ireland was the largest at $3.18B (38.6%), ahead of United States at $2.52B (30.6%) and Rest Of Europe at $1.59B (19.3%). The remaining region, Rest Of World, brought in $951.90M.
Compared with fiscal 2024, Ireland grew fastest, up 17.7% to $3.18B, while United States fell the most, down 15.4% to $2.52B.
Icon began breaking out Rest Of World in fiscal 2023, when it brought in $884.50M. Icon stopped reporting Other as a separate region after fiscal 2022, when it brought in $563.86M.
As Reported was Icon’s largest revenue line in fiscal 2024, bringing in $8.28B of $8.19B (101%).
| Revision of Prior Period | FY 2023 | FY 2024 |
|---|---|---|
| As Reported | $8.12B | $8.28B |
| Adjustments | -$65.25M | -$92.69M |
| Total | $8.05B | $8.19B |
Icon brought in $8.19B from its two revenue lines in fiscal 2024, the year ended December 31, 2024. That was up 1.7% from $8.05B in fiscal 2023. As Reported was the largest at $8.28B (101.1%).
The total is net of Adjustments, which took $92.69M off revenue in fiscal 2024.
Icon (ICLR) reports its revenue by customer, by geography and by revision of prior period. In fiscal 2025, Other was its largest revenue line, bringing in $2.97B (36.0% of the total), followed by Clients 11-25 at $2.07B (25.1%).
Other was Icon's largest revenue line in fiscal 2025, bringing in $2.97B, or 36.0% of the $8.25B total across its five revenue lines.
Ireland was Icon's largest region in fiscal 2025, bringing in $3.18B, or 38.6% of the $8.25B total across its four regions.
Among Icon's revenue lines that make up at least 2% of revenue, Clients 11-25 grew fastest in fiscal 2025, up 17.8% from $1.76B to $2.07B.
Every figure comes from Icon's annual financial filings, as reported. Each line keeps the name Icon gives it, and years follow its fiscal calendar.
Icon's revenue by customer goes back to fiscal 2018, 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.