Company: AHL
Filing Date: 2025-05-09
Form Type: 6-K
Source: 0001628280-25-024301
Chunk: 0

Company: ASPEN INSURANCE HOLDINGS LTD
Filing Date: 2025-05-09
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 May 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 ¨

#### Closing of Initial Public Offering
On May 9, 2025, Aspen Insurance Holdings Limited (“Aspen”) issued a press release announcing the closing of its upsized initial public offering (the “IPO”) of 13,250,000 of its Class A ordinary shares, par value $0.001 per share (“Class A Ordinary Shares”), at a price to the public of $30.00 per Class A Ordinary Share. The Class A Ordinary Shares were sold by certain entities managed by affiliates of Apollo Global Management, Inc. (the “selling shareholders”). In connection with the offering, the selling shareholders have granted the underwriters a 30-day option to purchase up to an additional 1,987,500 Class A Ordinary Shares. The Class A Ordinary Shares began trading under the ticker symbol “AHL” on the New York Stock Exchange on May 8, 2025. The press release, furnished as Exhibit 99.1 to this Form 6-K, is incorporated by reference as part of this Form 6-K.

#### Termination of Management Consulting Agreement
In connection with the completion of the IPO, the Management Consulting Agreement, dated as of March 27, 2019 (the “Management Consulting Agreement”), by and between Aspen and Apollo Management Holdings, L.P. (“Apollo Management”), was terminated effective as of the closing of the IPO. As a result, no management consulting fees will accrue or be payable to Apollo Management under the Management Consulting Agreement for periods subsequent to the closing of the IPO.

The information included in