Company: AHL
Filing Date: 2025-06-13
Form Type: 6-K
Source: 0001628280-25-031318
Chunk: 0

Company: ASPEN INSURANCE HOLDINGS LTD
Filing Date: 2025-06-13
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 June 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 ☒ Form 40-F ☐

#### Closing of the Public Offering of Senior Notes
On June 13 , 2025, Aspen Insurance Holdings Limited (the “Company”) closed its offering of $300,000,000 aggregate principal amount of its 5.750 % Senior Notes due 2030 (the “Notes”) , pursuant to an underwriting agreement, dated June 10, 2025 (the “Underwriting Agreement”), entered into by and among the Company and Citigroup Global Markets Inc., Lloyds Securities Inc. and HSBC Securities (USA) Inc., acting on behalf of themselves and as representatives of the underwriters named therein. A copy of the Underwriting Agreement is attached as Exhibit 1.1 hereto and is incorporated herein by reference. The Notes were offered pursuant to an effective shelf registration statement (File No. 333-272650) (the “Registration Statement”). In connection with the offer and sale of the Notes, the Company entered into the Fifth Supplemental Indenture (as defined below).

On June 13, 2025, the Company, as issuer, and Deutsche Bank Trust Company Americas (“Deutsche Bank”), as trustee, entered into a fifth supplemental indenture (the “Fifth Supplemental Indenture”) to that certain Indenture, by and between the Company, as issuer, and Deutsche Bank, as trustee, dated as of August 16, 2004 (the “Base Indenture”). The Base Indenture and the Fifth Supplemental Indenture set forth the terms and conditions under which the