Exhibit 99.1

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ORION GROUP HOLDINGS REPORTS

FIRST QUARTER 2026 RESULTS

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HOUSTON – April 28, 2026 – Orion Group Holdings, Inc. (NYSE: ORN) (the “Company” or “Orion”), a leading specialty construction company, today reported its financial results for the first quarter ended March 31, 2026.

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Highlights for the quarter ended March 31, 2026

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“We delivered a solid start to the year, supported by disciplined operational performance and a healthy $24 billion pipeline of opportunities. This translated into top- and bottom-line growth and good cash flow generation,” said Travis Boone, President and Chief Executive Officer of Orion. “Our teams continue to execute at a high level, positioning us well for the remainder of 2026.”

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“In our Marine segment, demand for mission-critical waterfront infrastructure continues to build, particularly across defense and port modernization projects. We are seeing an uptick in opportunities with the U.S. Coast Guard and the Department of War, underpinned by sustained federal investment in marine infrastructure outlined in the President’s Budget released in early April. We are making good progress integrating J.E. McAmis, leveraging their technical skillset to expand our opportunities and enhance project execution.”

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“Our Concrete segment had a fantastic quarter across all key metrics and delivered strong revenue and adjusted EBITDA growth. Data center development continues to serve as a primary market driver, supported by sustained investment from hyperscalers and enterprise customers, with expanding opportunities in growing end markets such as cold storage and advanced manufacturing.”  

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“Our backlog is growing and our pursuit pipeline remains healthy, with broad-based opportunities across both segments as we move through the year. This combination supports affirmation of our full year 2026 guidance,” concluded Boone.

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First Quarter 2026 Results

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See definitions and reconciliation of non-GAAP measures elsewhere in this release.

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Contract revenues of $216.3 million in the first quarter of 2026 increased $27.6 million, or 15%, from $188.7 million in the first quarter of last year, primarily due to strong demand and expansion of services in the Concrete segment.

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Gross profit was $25.9 million in the first quarter of 2026, an increase of $2.9 million, or 12%, from $23.0 million in the first quarter of 2025. The increase was primarily driven by the increase in revenue, strong project execution and favorable completions.

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Selling, general and administrative expenses were $26.3 million for the first quarter of 2026, up from $22.5 million in the first quarter of last year, primarily to support business growth and the acquisition of J.E. McAmis during the quarter.

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GAAP net income for the quarter ended March 31, 2026 was $4.7 million, or $0.12 per diluted share, compared to a net loss of $1.4 million, or $0.04 per diluted share, in the first quarter last year.

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Adjusted EBITDA for the first quarter of 2026 was $8.7 million, an increase of 7% compared to the first quarter of 2025. The year-over-year increase was primarily attributable to revenue growth and strong project execution.

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Backlog

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First quarter 2026 backlog included approximately $219 million in new awards. Recent Marine awards included maintenance dredging and a road bridge project for the Army in Hawaii, and a petroleum terminal expansion project. Recent Concrete awards included multiple data centers and expanded site work as well as numerous other commercial buildings.

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Balance Sheet Update

As of March 31, 2026, current assets were $261 million, including unrestricted cash and cash equivalents of $6.3 million. Total debt outstanding was $72 million, with $53 million of outstanding borrowings under the UMB Credit Facility. The Company incurred borrowings of approximately $47 million under the UMB Credit Facility in connection with its acquisition of J.E. McAmis.

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Guidance

The following forward-looking guidance reflects the Company’s current expectations and beliefs as of April 27, 2026, and is subject to change. The following statements apply only as of the date of this disclosure and are expressly qualified in their entirety by the cautionary statements included elsewhere in this document.

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For the full year 2026, Orion reaffirms its previous guidance of:

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Conference Call Details

Orion Group Holdings will host a conference call to discuss the first quarter 2026 financial results at 9:00 a.m. Eastern Time/8:00 a.m. Central Time on Wednesday, April 29, 2026. To participate, please call (844) 481-2994 and ask for the Orion Group Holdings Conference Call. A live audio webcast of the call will also be available on the Investor Relations section of Orion’s website at https://www.oriongroupholdingsinc.com/investor/ and will be archived for replay.

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About Orion Group Holdings

Orion Group Holdings, Inc., a leading specialty construction company serving the infrastructure, industrial and building sectors, provides services both on and off the water in the continental United States, Alaska, Hawaii, Canada and the Caribbean Basin through its marine segment and its concrete segment. The Company’s Marine segment provides construction and dredging services relating to marine transportation facility construction, marine pipeline construction, marine environmental structures, dredging of waterways, channels and ports, environmental dredging, design and specialty services. Its Concrete segment provides turnkey concrete construction services including place and finish, site prep, layout, forming, and rebar placement for large commercial, structural and other associated business areas. The Company is headquartered in Houston, Texas. The Company’s website is located at: https://www.oriongroupholdingsinc.com.

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Backlog Definition

Backlog consists of projects under contract that have either (a) not been started, or (b) are in progress but are not yet complete. The Company cannot guarantee that the revenue implied by its backlog will be realized, or, if realized, will result in earnings or profitability. Backlog can fluctuate from period to period due to the timing and execution of contracts. The typical duration of the Company’s Concrete projects ranges from six to twelve months and Marine projects range from 18 to 24 months. The Company's backlog at any point in time includes both revenue it expects to realize during the next twelve-month period as well as revenue it expects to realize in future years.

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Non-GAAP Financial Measures

This press release includes the financial measures “adjusted net income/loss,” “adjusted earnings/loss per share,” “EBITDA,” “Adjusted EBITDA,” and “Adjusted EBITDA margin.”  These measurements are “non-GAAP financial measures” under rules of the Securities and Exchange Commission, including Regulation G. The non-GAAP financial information may be determined or calculated differently by other companies that use similarly titled measures. By reporting such non-GAAP financial information, the Company does not intend to give such information greater prominence than comparable GAAP financial information. Investors are urged to consider these non-GAAP measures in addition to and not in substitute for measures prepared in accordance with GAAP.

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Adjusted net income/loss and adjusted earnings/loss per share should not be viewed as an equivalent financial measure to net income/loss or earnings/loss per share. Adjusted net income/loss and adjusted earnings/loss per share exclude certain items that management believes are one-time items or items whose timing or amount cannot be reasonably estimated. The Company believes these adjusted financial measures are a useful supplement to earnings/loss calculated in accordance with GAAP.

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Orion defines EBITDA as net income/loss before net interest expense, income taxes, depreciation and amortization. Adjusted EBITDA is calculated by adjusting EBITDA for certain items that management believes are one-time items or items whose timing or amount cannot be reasonably estimated. Adjusted EBITDA margin is calculated by dividing Adjusted EBITDA for the period by contract revenues for the period. The GAAP financial measure that is most directly comparable to EBITDA and Adjusted EBITDA is net income, while the GAAP financial measure that is most directly comparable to Adjusted EBITDA margin is operating margin, which represents operating income divided by contract revenues. EBITDA, Adjusted EBITDA and Adjusted EBITDA margin are used internally to evaluate current operating expense, operating efficiency, and operating profitability on a variable cost basis, by excluding the depreciation and amortization expenses, primarily related to capital expenditures and acquisitions, and net interest and tax expenses. Additionally, EBITDA, Adjusted EBITDA and Adjusted EBITDA margin provide useful information regarding the Company's ability to meet future debt service and working capital requirements while providing an overall evaluation of the Company's financial condition. In addition, EBITDA is used internally for incentive compensation purposes. The Company includes EBITDA, Adjusted EBITDA and Adjusted EBITDA margin to provide transparency to investors as they are commonly used by investors and others in assessing performance. EBITDA, Adjusted EBITDA and Adjusted EBITDA margin have certain limitations as analytical tools and should not be used as a substitute for operating margin, net income, cash flows, or other data prepared in accordance with GAAP, or as a measure of the Company's profitability or liquidity.

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Forward-Looking Statements

The matters discussed in this press release may constitute or include projections or other forward-looking statements within the meaning of the “safe harbor” provisions of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, of which provisions the Company is availing itself. Certain forward-looking statements can be identified by the use of forward-looking terminology, such as “believes,” ”expects,” “may,” ”will,” ”could,” ”should,” ”seeks,” ”approximately,” ”intends,” “plans,” ”estimates,” or ”anticipates,” or the negative thereof or other comparable terminology, or by discussions of strategy, plans, objectives, intentions, estimates, forecasts, guidance, outlook, assumptions, or goals. In particular, statements regarding our pipeline of opportunities, achievement of strategic priorities, position for growth, financial guidance and future operations or results, including those set forth in this press release, and any other statement, express or implied, concerning financial guidance or future operating results or the future generation of or ability to generate revenues, income, net income, gross profit, EBITDA, Adjusted EBITDA, Adjusted EBITDA margin, or cash flow, including to service debt or maintain compliance with debt covenants, and including any estimates, guidance, forecasts or assumptions regarding future

revenues or revenue growth, are forward-looking statements. Forward-looking statements also include project award announcements, estimated project start dates, ramp-up of contract activity and contract options, which may or may not be awarded in the future. Forward-looking statements involve risks, including those associated with the Company's fixed price contracts that impacts profits, unforeseen productivity delays that may alter the final profitability of the contract, cancellation of the contract by the customer for unforeseen reasons, delays or decreases in funding by the customer, levels and predictability of government funding or other governmental budgetary constraints, and any potential contract options that may or may not be awarded in the future, and are at the sole discretion of award by the customer. Past performance is not necessarily an indicator of future results. Considering these and other uncertainties, the inclusion of forward-looking statements in this press release should not be regarded as a representation by the Company that the Company's plans, estimates, forecasts, goals, intentions, or objectives will be achieved or realized. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date hereof. The Company assumes no obligation to update information contained in this press release whether as a result of new developments or otherwise, except as required by law.

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Please refer to the Company's 2025 Annual Report on Form 10-K, filed on March 4, 2026 which is available on its website at www.oriongroupholdingsinc.com or at the SEC's website at www.sec.gov, and filings and press releases subsequent to such Annual Report on Form 10-K for additional and more detailed discussion of risk factors that could cause actual results to differ materially from our current expectations, estimates or forecasts.

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Contact:

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Margaret Boyce

346-278-3762

mboyce@orn.net

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Source: Orion Group Holdings, Inc.

Orion Group Holdings, Inc. and Subsidiaries

Condensed Consolidated Statements of Operations

(In Thousands, Except Share and Per Share Information)

(Unaudited)

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Orion Group Holdings, Inc. and Subsidiaries

Reconciliation of Adjusted Net Income (Loss)

(In thousands except per share information)

(Unaudited)

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Orion Group Holdings, Inc. and Subsidiaries

Adjusted EBITDA and Adjusted EBITDA Margin Reconciliations

(In Thousands, Except Margin Data)

(Unaudited)

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Orion Group Holdings, Inc. and Subsidiaries

Adjusted EBITDA and Adjusted EBITDA Margin Reconciliations by Segment

(In Thousands, Except Margin Data)

(Unaudited)

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Orion Group Holdings, Inc. and Subsidiaries

Condensed Consolidated Statements of Cash Flows

(In Thousands)

(Unaudited)

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Orion Group Holdings, Inc. and Subsidiaries

Condensed Consolidated Balance Sheets

(In Thousands, Except Share and Per Share Information)

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Orion Group Holdings, Inc. and Subsidiaries

Guidance – Adjusted EBITDA Reconciliation

(In Thousands)

(Unaudited)

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Orion Group Holdings, Inc. and Subsidiaries

Guidance – Adjusted EPS Reconciliation

(In Thousands except per share information)

(Unaudited)

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