Company: AHL
Filing Date: 2025-04-29
Form Type: 6-K
Source: 0001628280-25-020462
Chunk: 0

Company: ASPEN INSURANCE HOLDINGS LTD
Filing Date: 2025-04-29
Form: 6-K
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### Form 6-K
<div align='center'>REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES</div>

#### EXCHANGE ACT OF 1934
<div align='center'>For the month of April 2025

Commission File Number: 001-31909</div>

### ASPEN INSURANCE HOLDINGS LIMITED
<div align='center'>(Translation of registrant’s name into English)</div>

#### 141 Front Street

#### Hamilton HM 19

#### Bermuda
<div align='center'>(Address of principal executive office)</div>

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ý Form 40-F ¨

On April 29, 2025, Aspen Insurance Holdings Limited (“Aspen,” the “ Company,” “our,” “we” or “us”) reported certain unaudited financial highlights * in connection with the performance of the Company for the three months ended March 31, 2025.

*The financial information as at and/or for the three months ended March 31, 2025 and March 31, 2024 presented herein (i) is based on a number of assumptions that are subject to inherent uncertainties and subject to change, and such variations could be material, (ii) is based on internal management accounts, and (iii) has not been audited, reviewed or verified by our independent registered public accounting firm and such financial information is therefore subject to adjustment. Such financial information may also be revised as a result of management’s further review of such information and any adjustments that may result from the completion of the audit of our consolidated financial statements for the 2025 fiscal year. As such, you should not place undue reliance on the financial information presented herein. Additionally, the financial information presented herein may not be indicative of any future period.

|                                                                |     | Three Months Ended March 31,            
 2025                                    
 Unaudited Results *                     
 ($ in millions, except for percentages) |         |   |     | 2024 |         |   |
|:---------------------------------------------------------------|:----|:----------------------------------------|--------:|:--|:----|:-----|--------:|:--|
| Gross written premiums