Company: AHL
Filing Date: 2025-06-13
Form Type: 6-K
Source: 0001628280-25-031318
Chunk: 1

Company: ASPEN INSURANCE HOLDINGS LTD
Filing Date: 2025-06-13
Form: 6-K
Chunk 1
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 Notes were issued, as well as the rights and obligations of the parties thereto and of the holders of the Notes. Copies of the Base Indenture and the Fifth Supplemental Indenture are filed as Exhibits 4.1 and 4.2 hereto, respectively, and are incorporated herein by reference.

Legal opinions relating to the validity of the Notes are attached hereto as Exhibits 5.1 and 5.2.

### INCORPORATION BY REFERENCE
This report on Form 6-K and the Exhibits hereto shall be deemed to be filed with the Securities and Exchange Commission and are incorporated by reference into the Registration Statement and to be a part thereof from the date on which this report is furnished, to the extent not superseded by documents or reports subsequently filed or furnished.

### EXHIBIT INDEX
| Exhibit 
 1.1     |     | Underwriting Agreement, dated June 10, 2025, among the Company and Citigroup Global Markets Inc., Lloyds Securities Inc. and HSBC Securities (USA) Inc., as representatives of the underwriters named therein                                                                                                        |
|:--------|:----|:---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 4.1     |     | Indenture, dated August 16, 2004, between the Company and Deutsche Bank Trust Company Americas, as trustee (incorporated herein by reference to Exhibit 4.3 to the Company’s Registration Statement on Form F-1 filed with the Securities and Exchange Commission on October 14, 2004 (Registration No. 333-119314)) |
| 4.2     |     | Fifth Supplemental Indenture, dated as of June 13, 2025, to the Indenture, dated as of August 16, 2004, by and between the Company and Deutsche Bank Trust Company Americas, as trustee                                                                                                                              |
| 4.3     |     | Form of Global Note evidencing the 5.750% Senior Notes due 2030 (included in Exhibit 4.2)                                                                                                                                                                                                                            |
| 5.1     |     | Opinion of Sidley Austin LLP                                                                                                                                                                                                                                                                                         |
| 5.2     |     | Opinion of Walkers (Bermuda) Limited                                                                                                                                                                                                                                                                                 |
| 23.1    |     | Consent of Sidley Austin LLP (included as part of Exhibit 5.1)                                                                                                                                                                                                                                                       |
| 23.2    |     |