WHITEBOX ADVISORS LLC - 01 Sep 2026 Form 3 Insider Report for HORNBECK OFFSHORE SERVICES, INC. (HOS)

Reporting relationship: 10%+ Owner
Issuer ticker: HOS
Reported as of: 01 Sep 2026
Net transaction value: $0
SEC form: 3
Accepted by SEC: 11 Sep 2026, 17:02:10 UTC
Prior SEC filing: 10 Mar 2022
Source filing: View source filing
Reporting owner signature: Whitebox Advisors LLC By: /s/ Muqu Karim, Chief Operating Officer & Chief Financial Officer

Key filing fact

WHITEBOX ADVISORS LLC filed Form 3 for HORNBECK OFFSHORE SERVICES, INC. (HOS) on 11 Sep 2026.

Key facts

This page summarizes WHITEBOX ADVISORS LLC's Form 3 filing for HORNBECK OFFSHORE SERVICES, INC. (HOS).
0 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 11 Sep 2026, 17:02.

Change

Previous filing in this sequence was filed on 10 Mar 2022.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Official SEC source

Ownership activity is grounded in SEC Form 3 disclosures.

View source filing

Reporting Owners (2)

CIK 0001257391 Primary reporting owner

WHITEBOX ADVISORS LLC

Relationship: 10%+ Owner
Address: 3033 EXCELSIOR BLVD., SUITE 500, MINNEAPOLIS
Signature: Whitebox Advisors LLC By: /s/ Muqu Karim, Chief Operating Officer & Chief Financial Officer
Signature date: 11 Sep 2026

CIK 0001650272

WHITEBOX GENERAL PARTNER LLC

Relationship: 10%+ Owner
Address: 3033 EXCELSIOR BLVD., SUITE 500, MINNEAPOLIS
Signature: Whitebox General Partner LLC By: /s/ Muqu Karim, Authorized Signatory
Signature date: 11 Sep 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

HOS holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 8,239,303
Date: 01 Sep 2026
Ownership: See Footnotes
Footnotes: F1, F2

HOS holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 8,239,303
Date: 01 Sep 2026
Ownership: See Footnotes
Footnotes: F1, F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

HOS holding Derivative

Warrants (right to buy)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
Date: 01 Sep 2026
Ownership: See Footnotes
Underlying class: Common Stock
Underlying amount: 29,634,393
Exercise price
Footnotes: F1, F2, F3, F4, F5, F6

HOS holding Derivative

Warrants (right to buy)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
Date: 01 Sep 2026
Ownership: See Footnotes
Underlying class: Common Stock
Underlying amount: 29,634,393
Exercise price
Footnotes: F1, F2, F3, F4, F5, F6

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 6 footnotes

Footnote F1

These securities are directly owned by certain private investment funds (the "Private Funds") and may be deemed to be beneficially owned by (a) Whitebox Advisors LLC by virtue of its role as the investment manager of the Private Funds and (b) Whitebox General Partner LLC by virtue of its role as the general partner of the Private Funds.

Footnote F2

Each Reporting Person disclaims beneficial ownership of the reported securities except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

Footnote F3

These warrants (the "Jones Act Warrants") are immediately exercisable, subject to certain restrictions on ownership of the Issuer's capital stock by non-U.S. citizens, including a beneficial ownership limitation (the "Beneficial Ownership Limitation") that prevents any holder that cannot establish to the Issuer's reasonable satisfaction that it is a "U.S. Citizen" within the meaning of the U.S. citizenship and cabotage laws commonly referred to as the "Jones Act" (principally 46 U.S.C. Section 50501(a), (b), and (d) and 46 U.S.C. Chapters 121 and 551) from exercising the Jones Act Warrants to the extent that, after giving effect to the issuance of shares of Common Stock upon such exercise, the holder would beneficially own more than 4.9% of the shares of Common Stock outstanding.

Footnote F4

These warrants have no expiration date.

Footnote F5

The Private Funds own an aggregate 2,885,061 Jones Act Warrants, each exercisable for 10.27167 shares of Common Stock, without giving effect to the Beneficial Ownership Limitation. Based solely on the application of the Beneficial Ownership Limitation to each Private Fund individually, and based on 222,166,587 shares of Common Stock outstanding as of September 9, 2026, provided by the Issuer, the Jones Act Warrants held by the Private Funds would be exercisable for up to an aggregate 21,435,064 shares of Common Stock.

Footnote F6

The exercise price of these warrants is $0.00001 per share.