Company: AHL
Filing Date: 2025-05-08
Form Type: 424B4
Source: 0001628280-25-023859
Chunk: 456

Company: ASPEN INSURANCE HOLDINGS LTD
Filing Date: 2025-05-08
Form: 424B4
Chunk 456
---
|:----|:---------------|--------------------------------------:|:----|:--|--------------------------------------:|
|                                            |     | -$ in millions |                                       |     |   |                                       |
| Balance at the beginning of the period     |     | $              |                                 296.2 |     | $ |                                 319.0 |
| Acquisition costs deferred                 |     |                |                                 446.1 |     |   |                                 357.4 |
| Amortization of deferred acquisition costs |     |                |                                -420.2 |     |   |                                -380.2 |
| Balance at the end of the period           |     | $              |                                 322.1 |     | $ |                                 296.2 |

<div align='center'>F-45</div>

#### 10.

#### Reserve for Losses and Loss Adjustment Expenses
The following table represents a reconciliation of beginning and ending consolidated reserve for losses and loss adjustment expenses for the twelve months ended December 31, 2024, 2023 and 2022:

|                                                                      |     | As at December 31, 
 2024               
 ($ in millions)    |          |     | 2023 |          |     | 2022 |          |
|:---------------------------------------------------------------------|:----|:-------------------|---------:|:----|:-----|---------:|:----|:-----|---------:|
| Reserve for losses and LAE at the start of the year                  |     | $                  |  7,810.6 |     | $    |  7,710.9 |     | $    |  7,611.8 |
| Less reinsurance recoverable                                         |     |                    | -4,577.8 |     |      | -4,897.7 |     |      | -3,298.1 |
| Net reserve for losses and LAE at the start of the year              |     |                    |  3,232.8 |     |      |  2,813.2 |     |      |  4,313.7 |
| Net loss and LAE expenses disposed(1)                                |     |                    |        — |     |      |        — |     |      | -1,840.1 |
| Movement in net reserve for losses and LAE for claims incurred:      |     |                    |          |     |      |          |     |      |          |
|