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Intangible assets | 9 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible assets | Intangible assets The carrying amount of Intangible Assets as of September 30, 2025 is as follows:
| September 30, 2025 (As Restated) |
| (in thousands)
Cost |  |
Customer relationships | $ | 4,134,107 |  |
Order backlog | 545,922 |  |
Trade names & brands | 204,713 |  |
Patient database | 170,487 |  |
Technology assets | 151,691 |  |
Total cost | 5,206,920 |  |
Accumulated amortization | (1,822,598) |  |
Impairment | (86,739) |  |
Net book value | $ | 3,297,583 |  |
In the three months ended September 30, 2025, the amortization expense recognized by the Company was $58.7 million (three months ended September 30, 2024: $58.0 million). In the nine months ended September 30, 2025, the amortization expense recognized by the Company was $176.7 million (nine months ended September 30, 2024: $291.0 million). An impairment indicator was identified specific to the Company's Data Solutions reporting unit that indicated the carrying amount of the intangible assets in the Data Solutions reporting unit may not be recoverable. This indicator related to the Company’s revised expectations on the future performance of the reporting unit considering specific external market participant factors. As a result, the Company assessed the fair value of the intangible assets based on estimated future discounted cash flows and recorded an impairment charge of $86.7 million. There were no additions to intangible assets during the nine months ended September 30, 2025.

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