Exhibit 8.1
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609 Main Street
Houston, TX 77002
United States
+1 713 836 3600
www.kirkland.com
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Facsimile:
+1 713 836 3601
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[●], 2026
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Hornbeck Offshore Services, Inc.
103 Northpark Boulevard, Suite 300
Covington, Louisiana 70433
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Ladies and Gentlemen:
We have acted as counsel to Hornbeck Offshore
Services, Inc., a Delaware corporation (“Hornbeck”), in connection with the Mergers, as defined in the Agreement and Plan of Merger (the “Merger Agreement”),
dated as of April 22, 2026, by and among Hornbeck, Helix Energy Solutions Group, Inc., a Delaware corporation (“Helix”), Odyssey Sub, Inc., a Delaware corporation and
direct, wholly owned subsidiary of Helix (“Parent Sub”) and Hercules Sub LLC, a Delaware limited liability company and direct and wholly owned Subsidiary of Helix (“LLC Sub”). All capitalized terms used but not otherwise defined herein have the meaning ascribed to
them in the Merger Agreement.
At your request, and in connection with the filing of the Form S-4 by Hornbeck with the
Securities and Exchange Commission (File No. [●]) (the “Registration Statement”), including the joint proxy statement/prospectus forming a part thereof (“Proxy
Statement/Prospectus”), we are rendering our opinion regarding certain U.S. federal income tax matters.
This opinion is based on various facts and assumptions and is conditioned upon certain representations made by Hornbeck and Helix
through certificates of officers of both Hornbeck and Helix (each an “Officer’s Certificate”).
Additionally, in connection with this opinion, and with your consent, we have reviewed
and relied upon the accuracy and completeness, without independent investigation or verification, of the following: (i) the Merger Agreement and the documents referenced therein; (ii) the Registration Statement, including the Proxy Statement/Prospectus; (iii) the Officer’s Certificates, dated as of the date hereof and delivered to us for purposes of this opinion; and
(iv) such other documents, information and materials as we have deemed necessary or appropriate.
Hornbeck Offshore Services, Inc.
[●], 2026
Page 2
In rendering this opinion, we have assumed, with your permission, that: (1) all parties to the Merger Agreement, and to any other
documents reviewed by us, have acted and will act in accordance with the terms of the Merger Agreement and such other documents; (2) the Mergers will be consummated pursuant to and in accordance with the terms and conditions set forth in the Merger
Agreement and the documents referenced therein, without the waiver or modification of any such terms and conditions, and as described in the Registration Statement; (3) all facts, information, statements, covenants, representations, warranties and
agreements made by or on behalf of Hornbeck, Helix, Parent Sub, and LLC Sub in the Merger Agreement and the documents referenced therein, the Registration Statement and the Officer’s Certificates are and, at all times up to the effective time of the
Second Company Merger, will continue to be true, complete and correct; (4) all facts, information, statements, covenants, representations, warranties and agreements made by or on behalf of Hornbeck, Helix, Parent Sub, and LLC Sub in the Merger
Agreement and the documents referenced therein, the Registration Statement and the Officer’s Certificates that are qualified by the knowledge, intention, expectation and/or belief of any person or entity are and, at all times up to the effective time
of the Second Company Merger, will continue to be true, complete and correct as though not so qualified; (5) as to all matters as to which any person or entity represents that it is not a party to, does not have, or is not aware of any plan, intention,
understanding or agreement, there is in fact no plan, intention, understanding or agreement and, at all times up to the effective time of the Second Company Merger, there will be no plan, intention, understanding or agreement; and (6) Hornbeck, Helix,
Parent Sub, and LLC Sub will report the Mergers for all U.S. federal income tax reporting purposes in a manner consistent with this opinion. We also have assumed the authenticity of original documents, the accuracy of copies, the genuineness of
signatures and the legal capacity of signatories. Moreover, we have assumed that all facts, information, statements and representations contained in the documents we have reviewed were true, complete and correct at the time made and will continue to be
true, complete and correct at all times up to the effective time of the Second Company Merger, and that all such facts, information, statements and representations can be established to the Internal Revenue Service or courts, if necessary, by clear and
convincing evidence. If any of the assumptions described above are untrue for any reason, or if the Mergers are consummated other than in accordance with the terms and conditions set forth in the Merger Agreement and the documents referenced therein,
our opinion as expressed below may be adversely affected.
Our opinion is based on the Code, the Treasury Regulations, case law and published rulings and other pronouncements of the Internal
Revenue Service, as in effect on the date hereof. No assurances can be given that such authorities will not be amended or otherwise changed at any time, possibly with retroactive effect. We assume no obligation to advise you of any such subsequent
changes, or to update or supplement this opinion to reflect any change in facts, circumstances or law after the date hereof. Any change in the applicable law or regulations, or any new administrative or judicial interpretation of the applicable law or
regulations, may affect the continuing validity of our opinion.
Hornbeck Offshore Services, Inc.
[●], 2026
Page 3
Based upon the foregoing and subject to the assumptions, exceptions, limitations and qualifications set forth herein and in the Proxy Statement/Prospectus
under the heading “The Mergers—Material U.S. Federal Income Tax Consequences,” we are of the opinion that the Mergers, taken together, will qualify as a “reorganization” within the meaning of Section 368(a) of
the Code.
Our opinion relates solely to the specific matters set forth above, and no opinion is expressed, or should be inferred, as to any other
U.S. federal, state, local or non-U.S. income, estate, gift, transfer, sales, use or other tax consequences that may result from the Mergers. Our opinion is limited to legal rather than factual matters and has no official status or binding effect of
any kind. Accordingly, we cannot assure you that the Internal Revenue Service or a court will agree with our opinion.
The opinion expressed herein is being furnished in connection with the filing of the Registration Statement and may not be used or relied upon for any other
purpose without our prior written consent. We hereby consent to the filing of this opinion with the Securities and Exchange Commission as Exhibit 8.1 to the Registration Statement and to the references to this opinion in the Registration Statement. In
giving this consent, we do not admit that we are within the category of persons whose consent is required under Section 7 of the Securities Act of 1933, as amended, or the rules or regulations of the Securities and Exchange Commission promulgated
thereunder.
Hornbeck Offshore Services, Inc.
[●], 2026
Page 4
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Very truly yours,
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_________________________________
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Kirkland & Ellis LLP
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