Company: AHL
Filing Date: 2025-04-29
Form Type: 6-K
Source: 0001628280-25-020465
Chunk: 0

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

#### Financial Statements
On March 30, 2025, Highlands Bermuda Holdco, Ltd. transferred all 60,395,839 of the issued and outstanding ordinary shares, par value $0.01 per share (“Ordinary Shares”), of Aspen Insurance Holdings Limited (the “Company,” “Aspen,” “our,” “we” or “us”) to us and for consideration of such transfer we issued to Highlands Bermuda Holdco, Ltd. 90,833,333 Class A ordinary shares, par value $0.001 per share (“Class A Ordinary Shares”) (the “Exchange”). The Class A Ordinary Shares have the same voting and economic rights as the Ordinary Shares other than par value. Following the Exchange, our sole issued and outstanding class of ordinary shares is the Class A Ordinary Shares and the Ordinary Shares have been cancelled and cease to exist.

As a result of the Exchange, the Company has made certain retroactive revisions to its consolidated financial statements that were previously contained in Part III, Item 18, “Financial Statements” of its Annual Report on Form 20-F for the year ended December 31, 2024 (the “2024 Form 20-F”), originally filed on March 19, 2025, in Exhibit 99.1 to this Form 6-K. The information in this Form 6-K under “Financial Statements” and Exhibit 99.1 hereto is not an amendment to, or restatement of, the 2024 Form 20-F and does not modify or update the disclosures therein in any