Company: HLX
Filing Date: 2025-10-28
Form Type: S-3ASR
Source: 0001140361-25-039546
Chunk: 16

Company: HELIX ENERGY SOLUTIONS GROUP INC
Filing Date: 2025-10-28
Form: S-3ASR
Chunk 16
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 has been approved by a committee of disinterested directors. |

Helix has opted out of this provision of the MBCA pursuant to its Articles of Incorporation. Transfer Agent and Registrar EQ Shareowner Services is the transfer agent and registrar for our common stock.

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#### TABLE OF CONTENTS

### DESCRIPTION OF DEBT SECURITIES
Any debt securities that we may offer under this prospectus will be our general unsecured obligations. The debt securities will be either senior debt securities or subordinated debt securities. We may issue the debt securities under one or more separate indentures between us and The Bank of New York Mellon Trust Company, N.A., as trustee. Any senior debt securities that we may offer under this prospectus will be issued under the Indenture dated as of August 14, 2020, between us and The Bank of New York Mellon Trust Company, N.A., as trustee (“the senior indenture”) and any subordinated debt securities that we may offer under this prospectus will be issued under a subordinated indenture (the “subordinated indenture”) to be entered into later between the Company and The Bank of New York Mellon Trust Company, N.A. In this description, we sometimes call the senior indenture and the subordinated indenture the “indentures.”

We have summarized certain terms and provisions of the indentures and the debt securities below. The summary is not complete and the terms and provisions of the indentures summarized herein may be modified by adding or removing covenants, events of default or other provisions as reflected in the relevant prospectus supplement for each particular series of debt securities. You should read the indentures for more details regarding the provisions described below and for other provisions that may be important to you. We have filed the senior indenture and the form of the subordinated indenture as exhibits to the registration statement, and we will include the applicable final subordinated indenture and any other instrument establishing the terms of any debt securities we offer as exhibits to a filing we will make with the SEC in connection with that offering. See “Where You Can Find More Information.”

In this summary description of the debt securities, all references to “Helix,” the “Company,” “we,” “us” or “our” mean Helix Energy Solutions Group, Inc. only, unless we state otherwise or the context clearly indicates otherwise.

#### General
The senior debt securities will constitute our senior debt and will rank equally with all of our unsecured and unsubordinated debt. The subordinated debt securities will be