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

Company: HELIX ENERGY SOLUTIONS GROUP INC
Filing Date: 2025-10-28
Form: S-3ASR
Chunk 3
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 OF PURCHASE CONTRACTS AND PURCHASE UNITS |     | 22 |
| DESCRIPTION OF UNITS                                 |     | 23 |
| PLAN OF DISTRIBUTION                                 |     | 24 |
| LEGAL MATTERS                                        |     | 27 |
| EXPERTS                                              |     | 27 |
| WHERE YOU CAN FIND MORE INFORMATION                  |     | 27 |

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#### TABLE OF CONTENTS

### ABOUT THIS PROSPECTUS
**This prospectus is part of a registration statement on Form S-3 that we have filed with the U.S. Securities and Exchange Commission (the “SEC”) using a “shelf” registration process. Under this shelf registration process, we may offer and sell from time to time, together or separately, in one or more offerings, any combination of the securities described in this prospectus, and the selling shareholders to be named in a supplement to this prospectus may offer and sell from time to time, in one or more offerings, shares of common stock as described in this prospectus.

This prospectus provides you with a general description of us and the securities offered under this prospectus. Each time we or the selling shareholders offer to sell securities under this prospectus, we or the selling shareholders will provide a prospectus supplement that will contain specific information about the terms of that offering and the securities being offered. A prospectus supplement also may add, update or change information in this prospectus. If there is any inconsistency between the information in this prospectus and any prospectus supplement, you should rely on the information in that prospectus supplement. You should read carefully this prospectus, the related exhibits filed with the SEC, any prospectus supplement and the additional information described below under the heading “Where You Can Find More Information.” This prospectus contains forward-looking statements that are subject to a number of risks and uncertainties, many of which are beyond our control. Please read “Risk Factors” and “Forward-Looking Statements.”

This prospectus contains summaries of certain provisions contained in some of the documents described herein, but reference is made to the actual documents for complete information. All of the summaries are qualified in their entirety by reference to the actual documents. For additional information about our business, operations and financial results, please read the documents incorporated by reference herein under the heading “Where You Can Find More Information.”

Unless otherwise indicated or the context otherwise requires, all references in this prospectus to “Helix,” the “Company,” “we,” “us,” or “our” relate to Hel