Company: AHL
Filing Date: 2025-03-20
Form Type: F-1/A
Source: 0001628280-25-014149
Chunk: 415

Company: ASPEN INSURANCE HOLDINGS LTD
Filing Date: 2025-03-20
Form: F-1/A
Chunk 415
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 they relate.

<div align='center'>F-5</div>

|                                          |     | Valuation of incurred but not reported reserve estimates, gross and net of reinsurance                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Description of the Matter                |     | At December 31, 2023, the Company’s reserves for losses and loss adjustment expenses, net of reinsurance, was $3,232 million, of which a significant proportion is incurred but not reported reserves (‘IBNR’). As described in Notes 2(b) and 10 of the consolidated financial statements, losses and loss adjustment expenses represents management’s estimate of the ultimate costs of all reported and unreported losses incurred through the balance sheet date.  There is significant uncertainty inherent in estimating the IBNR, gross and net of reinsurance. In particular, management’s estimate is sensitive to the actuarial methods selected and the significant assumptions applied, including the impact of catastrophe events and other large losses, reinsurance assumptions incorporated into net loss ratios, expected trends in claims severity and frequency, and expected duration of the respective claim’s development period.                                                                                                                                                                                                                                                                                                                     
 Auditing management’s estimate for IBNR reserve estimates, gross and net of reinsurance, was complex and required the involvement of our actuarial specialists, due to the sensitivity of the estimate to the actuarial methods selected and the judgmental nature of the significant assumptions used in the valuation of the estimate, including the netting of IBNR for reinsurance.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| How We Addressed the Matter in Our Audit |     | To assess the actuarial methodologies applied, with the assistance of our actuarial specialists, we compared management’s methods to those used in the industry for similar lines of business. To evaluate the significant assumptions used in the Company’s estimates, with the assistance of our actuarial specialists, our procedures included, among others, comparing the significant assumptions, such as incurred to ultimate loss ratios, and industry loss levels specifically for the catastrophe events and other large losses, expected trends in claims severity and frequency and expected duration of the respective claim’s development period, as well as reinsurance assumptions, to current industry benchmarks, compiled from information in the public domain, as well as those we have developed internally, from our experience with businesses in the same industry as the Company. Our procedures also included using the Company’s historical data to develop our own independent projections and a range of reserve estimates for selected classes of business. We compared our independent projections and