| Schedule of Finite-Lived Intangible Assets |
| | | | | | | Estimated Useful Life | | Customer relationships | 8 - 23 years | | Order backlog | 3 - 5 years | | | | Patient database | 7 years | | Technology assets | 5 years |
The carrying amount of Intangible Assets as of June 30, 2025 and December 31, 2024 is as follows:
| | | | | | | | | | | | | June 30,
2025 | December 31,
2024 | | (in thousands) | | Cost | | | | Customer relationships | $ | 4,134,482 | | $ | 4,129,501 | | | Order backlog | 545,993 | | 543,933 | | | Trade names & brands | 204,717 | | 204,588 | | | Patient database | 170,563 | | 170,324 | | | Technology assets | 151,718 | | 150,658 | | | | | | | | | | | | Total cost | 5,207,473 | | 5,199,004 | | | Accumulated amortization | (1,764,377) | | (1,639,212) | | | | | | Net book value | $ | 3,443,096 | | $ | 3,559,792 | |
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