Release Details

HOUSTON, Texas - September 21, 2026 - HMH Holding Inc. (NASDAQ: HMH) today announced the completion of its acquisition of Deepwater Riser Services, LLC ("DWR"), a leading provider of deepwater riser inspection, recertification, refurbishment and storage services based in Houma, Louisiana.

The acquisition extends HMH's global riser services platform and strengthens its position in the U.S. Gulf of America, an active deepwater basin. DWR's established Louisiana facilities, skilled workforce and long-standing customer relationships complement HMH's global scale, engineering capability, riser intellectual property and installed base, creating a more complete, life-of-field offering for our customers.

"The U.S. Gulf of America is an important deepwater basin, and DWR is a quality-driven, customer-responsive business with an outstanding team and a hard-won reputation. Its capabilities are a natural fit with our riser franchise, and together we can give customers a stronger service partner, supporting both our own equipment and the wider installed base," said Eirik Bergsvik, Chief Executive Officer, HMH.

DWR will operate as "Deepwater Riser Services, an HMH company," and will continue to serve its customers without interruption. HMH intends to leverage the Houma, Louisiana operation as a hub for riser services across the region.

"This is an exciting new chapter for our team and our customers which was part of our vision to align with a major riser OEM like HMH," said John DeBlieux, Vice President, Deepwater Riser Services. "Joining HMH brings our customers and our team the benefit of global scale and engineering depth, while we continue to deliver the responsive, high-quality service DWR is known for."

Financial terms of the transaction were not disclosed.

About HMH

HMH is a leading OEM and provider of highly engineered, mission-critical equipment solutions, providing customers with a comprehensive portfolio of drilling equipment, services, technology and systems utilized in oil and gas drilling operations, both offshore and onshore. HMH's global reach, technical expertise and innovative product offerings, coupled with its integrated operations from manufacturing to aftermarket services, allow HMH to provide customers with first-class technology, engineering, and project management services through the entire asset lifecycle of the equipment it provides. For more information, please visit HMH's website at www.hmhw.com.

About Deepwater Riser Services

Deepwater Riser Services, an HMH company, provides deepwater riser inspection, recertification, refurbishment and storage services to operators and drilling contractors from facilities in Houma, Louisiana, with dockside access to the U.S. Gulf of America.

Forward-Looking Statements

The information in this press release includes forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. These statements generally relate to expectations, beliefs, future events, future expected business, or our future financial or operating performance and prospects, and include statements regarding business plans, objectives and expected operating results. When used in this press release, words such as "may," "could," "should," "will," "plan," "project," "forecast," "guidance," "outlook," "budget," "predict," "pursue," "target," "seek," "objective," "believe," "expect," "anticipate," "intend," "estimate," the negative of these terms and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain such identifying words. Forward-looking statements are based on management's current expectations and assumptions, and are subject to inherent uncertainties, risks and changes in circumstances that are difficult to predict. As a result, actual results could differ materially from those indicated in these forward-looking statements. When considering these forward-looking statements, you should keep in mind the risk factors and other cautionary statements in HMH's filings with the Securities and Exchange Commission (the "SEC"), including the sections titled "Risk Factors" and "Cautionary Statement Regarding Forward-Looking Statements" in HMH's final prospectus filed with the SEC on April 1, 2026 and subsequent Quarterly Reports on Form 10-Q. HMH undertakes no obligation and does not intend to update these forward-looking statements to reflect events or circumstances occurring after this press release, except as required by law. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this press release.

Contacts

Media & Investor Relations: Katina Hargett | Investor Relations, HMH Holding Inc. | investorrelations@hmhw.com | +1 (281) 371-4985