Company: HLX
Filing Date: 2025-10-28
Form Type: S-3ASR
Source: 0001140361-25-039546
Chunk: 1

Company: HELIX ENERGY SOLUTIONS GROUP INC
Filing Date: 2025-10-28
Form: S-3ASR
Chunk 1
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 Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box. ☒ If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box.☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

| Large accelerated filer ☒ |     | Accelerated filer☐         |
| Non-accelerated filer☐    |     | Smaller reporting company☐ |
|                           |     | Emerging growth company☐   |

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act.☐

#### TABLE OF CONTENTS

### PROSPECTUS

#### Helix Energy Solutions Group, Inc.

#### Common Stock

#### Preferred Stock

#### Debt Securities

#### Warrants

#### Depositary Shares

#### Purchase Contracts

#### Purchase Units

#### Units
**We may offer and sell from time to time, together or separately, in one or more offerings, any combination of the securities listed above. The securities we may offer may be convertible into or exercisable or exchangeable for other securities. In addition, the selling shareholders named in any supplement to this prospectus may offer and sell shares of our common stock. We or the selling shareholders may offer and sell these securities from time to time in amounts, at prices and on terms to be determined by market conditions and other factors at the time of the offerings. We or the selling shareholders may offer and sell these securities to or through one or more underwriters, dealers and agents, or directly to one or more purchasers, on a continuous or delayed basis.

This prospectus provides you with a general description of these securities and the general manner in which we or the selling shareholders will offer and sell the securities. Each time we or the