Company: HLX
Filing Date: 2025-10-28
Form Type: S-3ASR
Source: 0001140361-25-039546
Chunk: 2

Company: HELIX ENERGY SOLUTIONS GROUP INC
Filing Date: 2025-10-28
Form: S-3ASR
Chunk 2
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 selling shareholders offer and 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 contained in this prospectus. You should carefully read this prospectus and any accompanying prospectus supplement before you invest in any of our securities.

We will not receive any proceeds from the sales of our common stock by the selling shareholders. See “Selling Shareholders” for a more detailed discussion about the selling shareholders.

Our common stock trades on the New York Stock Exchange (the “NYSE”) under the symbol “HLX.” The last reported sale price of our common stock, as reported on the NYSE on October 27, 2025, was $6.69 per share.

Our principal executive offices are located at 3505 West Sam Houston Parkway North, Suite 400, Houston, Texas 77043, and our telephone number is (281) 618-0400.

Investing in our securities involves a high degree of risk. You should carefully review the risks and uncertainties described under the heading “Risk Factors” contained on page**

#### 3
**herein and in any applicable prospectus supplement and under similar headings in the other documents incorporated by reference into this prospectus.

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.**

#### The date of this prospectus is October 28, 2025
TABLE OF CONTENTS

TABLE OF CONTENTS

| ABOUT THIS PROSPECTUS                                |     |  1 |
| ABOUT HELIX ENERGY SOLUTIONS GROUP, INC.             |     |  2 |
| RISK FACTORS                                         |     |  3 |
| FORWARD-LOOKING STATEMENTS                           |     |  4 |
| USE OF PROCEEDS                                      |     |  7 |
| SELLING SHAREHOLDERS                                 |     |  8 |
| DESCRIPTION OF CAPITAL STOCK                         |     |  9 |
| DESCRIPTION OF DEBT SECURITIES                       |     | 13 |
| DESCRIPTION OF WARRANTS                              |     | 20 |
| DESCRIPTION OF DEPOSITARY SHARES                     |     | 21 |
| DESCRIPTION