Company: AHL
Filing Date: 2025-03-20
Form Type: F-1/A
Source: 0001628280-25-014149
Chunk: 204

Company: ASPEN INSURANCE HOLDINGS LTD
Filing Date: 2025-03-20
Form: F-1/A
Chunk 204
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 inaccurate, produce loss estimates which take longer to converge with the final settlement value of loss.

• Loss development (“Chain Ladder”) method: This method uses actual loss data and the historical development profiles on older accident years to project more recent, less developed years to their ultimate position.

• Exposure-based method: This method is typically used for specific large catastrophic events such as a major hurricane. All exposure is identified and we work with known market information and information from our cedants to determine a percentage of the exposure to be taken as the ultimate loss.

In addition to these methodologies, our actuaries may use other approaches depending upon the characteristics of the class of business and available data. In addition, as required pursuant to Bermuda law, we have appointed a third party as loss reserve specialist for Aspen Bermuda Limited and as group actuary in relation to Aspen Holdings, in each case to provide an external view on the Company’s reserves.

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Table of C ontents

In general terms, the IELR method is most appropriate for classes of business and/or accident years where the actual paid or reported loss experience is not yet mature enough to modify our initial expectations of the ultimate loss ratios. Typical examples would be recent accident years for classes of business in casualty reinsurance. The BF method is generally appropriate where there are few reported claims and a relatively less stable pattern of reported losses. Typical examples would be our treaty risk excess class of business in our Reinsurance segment and marine hull class of business in our Insurance segment. The Chain Ladder method is appropriate when there are relatively stable patterns of loss emergence and a relatively large number of reported claims. Typical examples are the U.K. commercial property and U.K. commercial liability classes of business in our international insurance business.

Reserving Procedures and Process

Our actuaries calculate the IELR, BF and Chain Ladder and, if appropriate, other methods for each class of business and each accident year. They then calculate a single point actuarial central estimate (“ultimate”) for each class of business. The actuarial methodologies involve significant subjective judgments reflecting many factors, including but not limited to, changes in legislative conditions, changes in judicial interpretation of legal liability policy coverages and heightened inflation. Our actuaries collaborate with our underwriting, claims, legal and finance teams in identifying factors which are incorporated in their range of ultimates in which management’s best estimate is most likely to fall.

There are no differences between our year-end and our quarterly internal reserving procedures and processes because our actu