CEO — Todd M. Hornbeck: The filing discloses the execution of new employment agreements for existing executives in connection with a transaction, which is a compensatory arrangement rather than a departure or change in personnel.

Changes in Registrant’s Certifying Accountant. (a) Dismissal of Independent Registered Public Accounting Firm KPMG LLP (“KPMG”) served as the independent registered public accounting firm of Helix prior to completion of the Merger. On September 2, 2026, the audit committee (the “Audit Committee”) of the Company’s board of directors approved the dismissal of KPMG as the Company’s independent registered public accounting firm, effective as of September 2, 2026. KPMG’s audit reports on Helix’s c…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth in

Completion of Acquisition or Disposition of Assets. The information set forth or incorporated by reference in the Introductory Note of this Current Report on Form 8-K (this “ Current Report ”) is incorporated by reference into this

Second Amendment to First Lien Revolving Credit Agreement On August 28, 2026, Legacy Hornbeck entered into that certain Second Amendment (“ First Lien Amendment ”) to the Credit Agreement, dated as of August 13, 2024, as amended by that certain First Amendment to Credit Agreement, dated as of December 27, 2024, by and among Legacy Hornbeck, as borrower, DNB Bank ASA, New York Branch, as administrative agent, Wilmington Trust, National Association, as collateral agent and collateral trustee, a…

Unregistered Sales of Equity Securities. Certain stockholders of Legacy Hornbeck (the “ Consenting Stockholders ”) delivered a written consent adopting the Merger Agreement and approving the transactions contemplated thereby. Pursuant to the Merger Agreement, the Consenting Stockholders were issued an aggregate of 37,818,435 shares of Common Stock (the “ Consenting Stockholder Shares ”). Additionally, an aggregate of 8,617,903 Jones Act Warrants held by the Consenting Stockholders were assume…

Director: The resignations and appointments are part of a merger transaction where the board composition was reconstituted according to the Merger Agreement, representing a corporate restructuring rather than a routine departure or individual executive loss.

Termination of a Material Definitive Agreement. Termination of Helix ABL Credit Facility At the Effective Time, Helix terminated its existing $120 million asset-based credit agreement, dated as of September 30, 2021 (as amended, the “ Helix ABL Facility ”), with Bank of America, N.A., as agent, and the financial institutions party thereto as lenders. In connection with the termination, the liens and guarantees securing the Helix ABL Facility were released. There were no outstanding borrowings…

Material Modification to Rights of Security Holders. The information set forth in the Introductory Note, in

Changes in Control of Registrant. The information set forth under the Introductory Note and

Results of Operations and Financial Condition. On August 6, 2026, Helix Energy Solutions Group, Inc. (“Helix”) issued a press release reporting its financial results for the second quarter 2026. The press release is furnished herewith as Exhibit 99.1 and incorporated herein by reference. ​

Other Events. As previously disclosed, on April 22, 2026, Helix Energy Solutions Group, Inc., a Minnesota corporation (“ Parent ”), Odyssey Sub, Inc., a Delaware corporation and direct, wholly owned subsidiary of Parent (“ Parent Sub ”), Hercules Sub LLC, a Delaware limited liability company and direct, wholly owned subsidiary of Parent (“ LLC Sub ”), and Hornbeck Offshore Services, Inc., a Delaware corporation (the “ Company ”) entered into an Agreement and Plan of Merger (the “ Merger Agree…

Entry into a Material Definitive Agreement. On May 1, 2026, Helix Alliance Decom, LLC, a Delaware ‎limited liability company (“Seller”), a wholly owned subsidiary of Helix Energy Solutions Group, Inc., a Minnesota corporation (NYSE: HLX) (“Helix” or the “Company”), entered into an equity purchase agreement (the “Equity Purchase Agreement”) with C-Dive, L.L.C., a Louisiana limited liability company (“Purchaser”), and completed the sale of all the equity interests of the Alliance group of compa…

Entry into a Material Definitive Agreement. Merger Agreement On April 22, 2026, Helix Energy Solutions Group, Inc., a Minnesota corporation (“ Parent ”), Odyssey Sub, Inc., a Delaware corporation and direct, wholly owned subsidiary of Parent (“ Parent Sub ”), Hercules Sub LLC, a Delaware limited liability company and direct, wholly owned subsidiary of Parent (“ LLC Sub ”), and Hornbeck Offshore Services, Inc., a Delaware corporation (the “ Company ”) entered into an Agreement and Plan of Merg…

Results of Operations and Financial Condition. On April 22, 2026, Helix Energy Solutions Group, Inc. (“Helix”) issued a press release reporting its financial results for the first quarter 2026. The press release is furnished herewith as Exhibit 99.1 and incorporated herein by reference. ​

of this report, including Exhibit 99.1 and Exhibit 99.2, shall not be incorporated by reference into any filing of the registrant, whether made before or after the date hereof, regardless of any general incorporation language in such filing, unless expressly incorporated by specific reference to such filing. The information in this report, including the exhibit hereto, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise…

Results of Operations and Financial Condition. On February 23, 2026, Helix Energy Solutions Group, Inc. (“Helix”) issued a press release reporting its financial results for the fourth quarter and full year 2025. The press release is furnished herewith as Exhibit 99.1 and incorporated herein by reference. ​

Entry into a Material Definitive Agreement. On February 12, 2026, Helix Energy Solutions Group, Inc. (“Helix”), OneSubsea LLC, OneSubsea UK Limited, Schlumberger Technology Corporation, Schlumberger B.V. and Schlumberger Oilfield Holdings Ltd. entered into an amendment (“Amendment No. 2”) to the Strategic Alliance Agreement entered into by the parties on January 5, 2015 (as amended, the “Alliance Agreement”). The Alliance Agreement provides the terms for the parties’ strategic alliance to des…

CEO — Owen Kratz: The CEO announced a planned retirement with an intention to stay until a successor is appointed, indicating an orderly succession rather than a sudden loss of leadership.

Results of Operations and Financial Condition. On October 22, 2025, Helix Energy Solutions Group, Inc. (“Helix”) issued a press release reporting its financial results for the third quarter 2025. The press release is furnished herewith as Exhibit 99.1 and incorporated herein by reference. ​

Results of Operations and Financial Condition. On July 23, 2025, Helix Energy Solutions Group, Inc. (“Helix”) issued a press release reporting its financial results for the second quarter 2025. The press release is furnished herewith as Exhibit 99.1 and incorporated herein by reference. ​

Other Events. Further to the Company’s share repurchase program authorized by its Board of Directors in February 2023, during the second quarter 2025 the Company completed repurchase of approximately $30,000,000 in shares of the Company’s common stock through a written trading plan under Rule 10b5-1 of the Securities and Exchange Act of 1934 (the “Exchange Act”). Additional information regarding share repurchases will be available in the Company’s periodic reports in Form 10-Q and Form 10-K f…

Results of Operations and Financial Condition. On April 23, 2025, Helix Energy Solutions Group, Inc. (“Helix”) issued a press release reporting its financial results for the first quarter 2025. The press release is furnished herewith as Exhibit 99.1 and incorporated herein by reference. ​

Results of Operations and Financial Condition. On February 24, 2025, Helix Energy Solutions Group, Inc. (“Helix”) issued a press release reporting its financial results for the fourth quarter and full year 2024. The press release is furnished herewith as Exhibit 99.1 and incorporated herein by reference. ​

Entry into a Material Definitive Agreement. On February 17, 2025, Helix Energy Solutions Group, Inc. (“Helix”), OneSubsea LLC, Cameron Lux V Sarl, as successor in interest to OneSubsea B.V., OneSubsea UK Limited, Schlumberger Technology Corporation, Schlumberger B.V. and Schlumberger Oilfield Holdings Ltd. entered into an Amendment and Assignment Agreement (the “Amendment”) to the Strategic Alliance Agreement entered into by the parties on January 5, 2015 (as amended, the “Alliance Agreement”…