Notice of Proposed Sale · 144

Hornbeck Offshore Services, Inc.

HOSNYSEEQUITYCurrent

Notice of Proposed Sale

Filed Sep 9, 2026Accepted Sep 9, 2026, 4:29 PM EDTFiling CIK 866829Accession 0001959173-26-006839

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Structured filing — 144

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Notice of proposed sale. The proposed amounts below do not establish that a sale occurred.

Proposed-sale notice

Issuer: HORNBECK OFFSHORE SERVICES, INC.
Issuer CIK: 0000866829
SEC file number: 001-32936
Phone: 985-727-2000
Person for whose account securities are to be sold: Staffeldt Erik
Relationships to issuer: Officer
Street: 103 NORTHPARK BOULEVARD
Street (continued): SUITE 300
City: COVINGTON
State / country code: LA
Postal code: 70433

Securities proposed for sale

Securities proposed for sale · 1 reported row
Security	Proposed units	Aggregate market value	Units outstanding	Approximate sale date	Exchange	Broker / market maker
Common	107,081	976,149.08	147,382,447	09/09/2026	NYSE	Fidelity Brokerage Services LLC

Broker / market maker — proposed row 1, entry 1

Name: Fidelity Brokerage Services LLC
Street: 900 Salem Street
City: Smithfield
State / country code: RI
Postal code: 02917

Acquisition of securities to be sold

Acquisition of securities to be sold · 2 reported rows
Security	Acquired	Nature of acquisition	Acquired from	Amount acquired	Gift transaction	Payment date	Nature of payment
Common	01/01/2020	Restricted Stock Vesting	Issuer	2,596	N	01/01/2020	Compensation
Common	01/02/2025	Restricted Stock Vesting	Issuer	104,485	N	01/02/2025	Compensation

Sales reported in the preceding three months

Sales reported in the preceding three months · 3 reported rows
Seller	Security	Sale date	Amount sold	Gross proceeds
Erik S. Staffeldt	Common	09/02/2026	117,619	1,222,070.09
Erik S. Staffeldt	Common	09/03/2026	130,635	1,275,873.45
Erik S. Staffeldt	Common	09/08/2026	50,911	464,512.11

Seller — prior-sale row 1, entry 1

Name: Erik S. Staffeldt
Street: 103 Northpark Boulevard
Street (continued): Suite 300
City: Covington
State / country code: LA
Postal code: 70433

Seller — prior-sale row 2, entry 1

Name: Erik S. Staffeldt
Street: 103 Northpark Boulevard
Street (continued): Suite 300
City: Covington
State / country code: LA
Postal code: 70433

Seller — prior-sale row 3, entry 1

Name: Erik S. Staffeldt
Street: 103 Northpark Boulevard
Street (continued): Suite 300
City: Covington
State / country code: LA
Postal code: 70433

Prior-sale reporting

Nothing to report for the preceding three months: N

Notice signature

Notice date: 09/09/2026
Signed: /s/ Daniel Tucci, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Erik Staffeldt

Company context

Hornbeck Offshore Services, Inc. is a global offshore services leader, providing innovative and integrated marine and subsea solutions to customers across the deepwater oilfield, defense and renewables industries.

Current securities

HOSNYSE · EQUITY · Current

Historical securities (1)

HLXNYSE · EQUITY · Historical · closed Sep 1, 2026

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