ORION GROUP HOLDINGS, INC.

Exhibit 99.1

ORION GROUP HOLDINGS REPORTS

FIRST QUARTER 2026 RESULTS

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.

Highlights for the quarter ended March 31, 2026

●Revenue of $216 million, GAAP net income of $4.7 million or $0.12 per diluted share, Adjusted EBITDA of $8.7 million and Adjusted EPS of $0.05 per diluted share

●Cash flow from operations of $4.9 million

●Booked awards and change orders of $219 million in the quarter

●Reaffirming full-year 2026 guidance

“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.”

“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.”

“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.”

“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.

First Quarter 2026 Results


	Quarter Ended
	March 31,			March 31,
	2026			2025
Revenue	$	216.3		$	188.7
GAAP Net Income (Loss)	$	4.7		$	(1.4)
GAAP EPS	$	0.12		$	(0.04)
Adjusted EBITDA	$	8.7		$	8.2
Adjusted EPS	$	0.05		$	0.01

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

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.

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.

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.

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.

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.

Backlog


	March 31,		December 31,
	2026		2025
Marine	$	494	$	480
Concrete		174		160
Total	$	668	$	640

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.

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.

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.

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

●

Revenue in the range of $900 million to $950 million, 8.6% annual growth at the midpoint

●

Adjusted EBITDA in the range of $54 million to $58 million, 24% annual growth at the midpoint

●

Adjusted EPS in the range of $0.36 to $0.42, 56% annual growth at the midpoint

●

Capital expenditures in the range of $25 million to $35 million

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.

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.

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.

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.

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.

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.

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.

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.

Contact:

Margaret Boyce

346-278-3762

[email protected]

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)


		Three Months Ended
		March 31,
		2026			2025
Contract revenues		$	216,301		$	188,653
Costs of contract revenues			190,422			165,638
Gross profit			25,879			23,015
Selling, general and administrative expenses			26,319			22,545
Amortization of intangible assets			390			—
Gain on disposal of assets, net			(35)			(363)
Operating (loss) income			(795)			833
Other (expense) income:
Interest expense			(1,531)			(2,334)
Other income			161			227
Other expense, net			(1,370)			(2,107)
Loss before income taxes			(2,165)			(1,274)
Income tax (benefit) expense			(6,852)			140
Net income (loss)		$	4,687		$	(1,414)

Basic income (loss) per share		$	0.12		$	(0.04)
Diluted income (loss) per share		$	0.12		$	(0.04)
Shares used to compute income (loss) per share
Basic			40,110,047			39,056,396
Diluted			40,133,155			39,056,396

Orion Group Holdings, Inc. and Subsidiaries

Reconciliation of Adjusted Net Income (Loss)

(In thousands except per share information)

(Unaudited)


		Three Months Ended
		March 31,
		2026			2025
Net income (loss)		$	4,687		$	(1,414)
Adjusting items and the tax effects:
Non-cash share-based compensation			1,387			1,123
ERP implementation			81			605
Severance			—			30
Process improvement initiatives			—			138
Acquisition and integration costs			1,613			—
Amortization of purchased intangibles			390			—
Tax rate of 23% applied to adjusting items⁽¹⁾			(798)			(436)
Reversal of the impact of valuation allowances			(5,395)			214
Adjusted net income		$	1,965		$	260
Adjusted EPS		$	0.05		$	0.01

(1)	Items are taxed discretely using the Company's blended tax rate.

Orion Group Holdings, Inc. and Subsidiaries

Adjusted EBITDA and Adjusted EBITDA Margin Reconciliations

(In Thousands, Except Margin Data)

(Unaudited)


		Three Months Ended
		March 31,
		2026			2025
Net income (loss)		$	4,687		$	(1,414)
Income tax (benefit) expense			(6,852)			140
Interest expense, net			1,444			2,141
Depreciation and amortization			6,387			5,403
EBITDA⁽¹⁾			5,666			6,270
Non-cash share-based compensation			1,387			1,123
ERP implementation			81			605
Severance			—			30
Process improvement initiatives			—			138
Acquisition and integration costs			1,613			—
Adjusted EBITDA⁽²⁾		$	8,747		$	8,166
Adjusted EBITDA margin⁽²⁾			4.0	%		4.3	%

(1)	EBITDA is a non-GAAP measure that represents earnings before interest, taxes, depreciation and amortization.

(2)

Adjusted EBITDA is a non-GAAP measure that represents EBITDA adjusted for non-cash share-based compensation, ERP implementation, severance, process improvement initiatives and acquisition and integration costs. Adjusted EBITDA margin is a non-GAAP measure calculated by dividing Adjusted EBITDA by contract revenues.

Orion Group Holdings, Inc. and Subsidiaries

Adjusted EBITDA and Adjusted EBITDA Margin Reconciliations by Segment

(In Thousands, Except Margin Data)

(Unaudited)


	For the three months ended March 31, 2026
	Marine			Concrete			General Corporate		Consolidated
Contract revenues	$	110,129		$	106,172		$	—	$	216,301

Operating income (loss)		6,580			7,736			(15,111)		(795)
Other income		22			—			52		74
Depreciation and amortization		4,981			700			706		6,387
EBITDA⁽¹⁾		11,583			8,436			(14,353)		5,666
Non-cash share-based compensation		335			176			876		1,387
ERP implementation		—			—			81		81
Acquisition and integration costs		—			—			1,613		1,613
Adjusted EBITDA⁽²⁾	$	11,918		$	8,612		$	(11,783)	$	8,747
Adjusted EBITDA margin⁽²⁾		10.8	%		8.1	%				4.0	%


	For the three months ended March 31, 2025
	Marine			Concrete			General Corporate		Consolidated
Contract revenues	$	127,163		$	61,490		$	—	$	188,653

Operating income (loss)		12,322			1,809			(13,298)		833
Other income		—			10			24		34
Depreciation and amortization		4,378			872			153		5,403
EBITDA⁽¹⁾		16,700			2,691			(13,121)		6,270
Non-cash share-based compensation		280			91			752		1,123
ERP implementation		—			—			605		605
Severance		—			16			14		30
Process improvement initiatives								138		138
Adjusted EBITDA⁽²⁾	$	16,980		$	2,798		$	(11,612)	$	8,166
Adjusted EBITDA margin⁽²⁾		13.4	%		4.6	%				4.3	%

(1)	EBITDA is a non-GAAP measure that represents earnings before interest, taxes, depreciation and amortization.

(2)

Orion Group Holdings, Inc. and Subsidiaries

Condensed Consolidated Statements of Cash Flows

(In Thousands)

(Unaudited)


		Three months ended March 31,
		2026			2025
Cash flows from operating activities
Net income (loss)		$	4,687		$	(1,414)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization			4,384			3,175
Amortization of right-of-use ("ROU") operating leases			1,402			2,477
Amortization of ROU finance leases			2,003			2,228
Amortization of deferred debt issuance costs			84			395
Deferred income taxes			(6,829)			(11)
Share-based compensation			1,387			1,123
Gain on disposal of assets, net			(35)			(363)
Allowance for credit losses			(18)			232
Change in operating assets and liabilities:
Accounts receivable			33,737			(35,266)
Income tax receivable			14			47
Inventory			(288)			63
Prepaid expenses and other			2,627			1,319
Contract assets			(10,457)			20,827
Accounts payable			(13,948)			13,747
Accrued liabilities			(11,779)			(6,174)
Operating lease liabilities			(1,495)			(1,219)
Income tax payable			79			(14)
Contract liabilities			(630)			(4,615)
Net cash provided by (used in) operating activities			4,925			(3,443)
Cash flows from investing activities:
Proceeds from sale of property and equipment			60			341
Purchase of property and equipment			(8,575)			(9,033)
Business acquisition, net cash acquired			(44,000)			—
Net cash used in investing activities			(52,515)			(8,692)
Cash flows from financing activities:
Borrowings on credit facilities			53,000			3,047
Payments on credit facilities			(40,000)			(3,148)
Proceeds from term loan			40,000			—
Proceeds from deemed financing obligation			4,221			—
Principal payments on deemed financing obligation			(1,226)			(729)
Loan costs related to credit facilities			(419)			(323)
Payments of finance lease liabilities			(2,507)			(2,517)
Employee stock plans, net activity			(813)			445
Net cash provided by (used in) financing activities			52,256			(3,225)
Net change in cash, cash equivalents and restricted cash			4,666			(15,360)
Cash, cash equivalents and restricted cash at beginning of period			3,285			28,316
Cash, cash equivalents and restricted cash at end of period		$	7,951		$	12,956

Orion Group Holdings, Inc. and Subsidiaries

Condensed Consolidated Balance Sheets

(In Thousands, Except Share and Per Share Information)


		March 31,			December 31,
		2026			2025
		(Unaudited)
ASSETS
Current assets:
Cash and cash equivalents		$	6,254		$	1,588
Restricted cash			1,697			1,697
Accounts receivable:
Trade, net of allowance for credit losses of $3,443 and $3,461, respectively			140,130			175,695
Retainage			54,484			49,194
Income taxes receivable			241			256
Other current			3,648			3,531
Inventory			2,760			2,432
Contract assets			42,633			31,083
Prepaid expenses and other			9,574			12,686
Total current assets			261,421			278,162
Property and equipment, net of accumulated depreciation			125,444			88,210
Operating lease right-of-use assets, net of accumulated amortization			24,391			20,397
Financing lease right-of-use assets, net of accumulated amortization			16,361			18,360
Inventory, non-current			6,484			6,395
Other non-current			2,566			3,128
Goodwill			32,742			—
Intangible Assets			9,314			—
Total assets		$	478,723		$	414,652
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Current debt, net of debt issuance costs		$	5,849		$	1,789
Accounts payable:
Trade			95,025			107,433
Retainage			1,372			1,699
Accrued liabilities			19,610			31,750
Income taxes payable			275			197
Contract liabilities			52,379			49,104
Current portion of operating lease liabilities			4,698			4,418
Current portion of financing lease liabilities			6,000			7,517
Total current liabilities			185,208			203,907
Long-term debt, net of debt issuance costs			66,336			6,085
Operating lease liabilities			28,314			24,695
Financing lease liabilities			5,461			5,878
Other long-term liabilities			26,736			15,055
Total liabilities			312,055			255,620
Stockholders’ equity:
Accumulated other comprehensive loss			(23)			—
Preferred stock -- $0.01 par value, 10,000,000 authorized, none issued			—			—
Common stock -- $0.01 par value, 50,000,000 authorized, 41,190,509 and 40,612,139 issued; 40,479,278 and 39,900,908 outstanding at March 31, 2026 and December 31, 2025, respectively			412			406
Treasury stock, 711,231 shares, at cost, as of March 31, 2026 and December 31, 2025, respectively			(6,540)			(6,540)
Additional paid-in capital			229,335			226,369
Retained loss			(56,516)			(61,203)
Total stockholders’ equity			166,668			159,032
Total liabilities and stockholders’ equity		$	478,723		$	414,652

Orion Group Holdings, Inc. and Subsidiaries

Guidance – Adjusted EBITDA Reconciliation

(In Thousands)

(Unaudited)


	Year Ending
	December 31, 2026
		Low Estimate		High Estimate
Net income	$	11,500	$	15,300
Income tax expense		400		600
Interest expense, net		7,700		7,700
Depreciation and amortization		25,400		25,400
EBITDA⁽¹⁾		45,000		49,000
Non-cash share-based compensation		7,200		7,200
ERP implementation		1,800		1,800
Acquisition and integration costs⁽²⁾		—		—
Adjusted EBITDA⁽³⁾	$	54,000	$	58,000

(1)

EBITDA is a non-GAAP measure that represents earnings before interest, taxes, depreciation and amortization.

(2)

Amounts related to acquisition and integration costs are not yet available because the purchase accounting for the acquisition is still in process. Accordingly, these amounts have not been included in this reconciliation and will be reflected in a future period once the purchase accounting is finalized.

(3)

Adjusted EBITDA is a non-GAAP measure that represents EBITDA adjusted for non-cash share-based compensation, ERP implementation, and acquisition and integration costs.

Orion Group Holdings, Inc. and Subsidiaries

Guidance – Adjusted EPS Reconciliation

(In Thousands except per share information)

(Unaudited)


	Year Ending
	December 31, 2026
		Low Estimate		High Estimate
Net income	$	11,500	$	15,300
Adjusting items and the tax effects:
Non-cash share-based compensation		7,200		7,200
ERP implementation		1,800		1,800
Acquisition and integration costs⁽¹⁾		—		—
Amortization of purchased intangibles⁽¹⁾		—		—
Tax rate of 23% applied to adjusting items⁽²⁾		(2,100)		(2,100)
Reversal of the impact of valuation allowances		(3,700)		(5,000)
Adjusted net income⁽³⁾	$	14,700	$	17,200
Adjusted EPS⁽³⁾	$	0.36	$	0.42

(1)

Amounts related to acquisition and integration costs and amortization of purchased intangibles are not yet available because the purchase accounting for the acquisition is still in process. Accordingly, these amounts have not been included in this reconciliation and will be reflected in a future period once the purchase accounting is finalized.

(2)

Items are taxed discretely using the Company's blended tax rate.

(3)

Adjusted net income and Adjusted EPS are non-GAAP measures that represent net income adjusted for non-cash share-based compensation, ERP implementation, acquisition and integration costs and amortization of purchased intangibles.

Exhibit 99.2

MARINE | CONCRETE | ENGINEERING & CONSULTING Investor Presentation April 2026

2 DISCLAIMER This presentation contains, and the officers and directors of the Company may from time to time make, statements that are considered forward looking statements within the meaning of the Securities Act of 1933 and the Securities Exchange Act of 1934. These forward-looking statements are subject to a number of risks and uncertainties, many of which are beyond our control, which may include statements about: our business strategy; our financial strategy; our industry outlook; and our expected margin growth; our pipeline of opportunity; the expected benefits, results, growth and integration of our acquisition of J.E. McAmis; and our plans, objectives, expectations, forecasts, outlook and intentions. All of these types of statements, other than statements of historical fact included in this presentation, are forward-looking statements. In some cases, forward-looking statements can be identified by terminology such as “may,” “will,” “could,” “should,” “expect,” “plan,” “project,” “intend,” “anticipate,” “believe,” “estimate,” “predict,” “potential,” “pursue,” “target,” “continue,” the negative of such terms or other comparable terminology. The forward-looking statements contained in this presentation are largely based on our expectations, which reflect estimates and assumptions made by our management. These estimates and assumptions reflect our best judgment based on currently known market conditions and other factors. Although we believe such estimates and assumptions to be reasonable, they are inherently uncertain and involve a number of risks and uncertainties that are beyond our control. In addition, management’s assumptions about future events may prove to be inaccurate. Management cautions all readers that the forward-looking statements contained in this presentation are not guarantees of future performance, and we cannot assure any reader that such statements will be realized or the forward-looking events and circumstances will occur. Actual results may differ materially from those anticipated or implied in the forward-looking statements due to factors listed in the “Risk Factors” section in our filings with the U.S. Securities and Exchange Commission and elsewhere in those filings. Additional factors or risks that we currently deem immaterial, that are not presently known to us or that arise in the future could also cause our actual results to differ materially from our expected results. Given these uncertainties, investors are cautioned that many of the assumptions upon which our forward-looking statements are based are likely to change after the date the forward-looking statements are made. The forward-looking statements speak only as of the date made, and we undertake no obligation to publicly update or revise any forward-looking statements for any reason, whether as a result of new information, future events or developments, changed circumstances, or otherwise, notwithstanding any changes in our assumptions, changes in business plans, actual experience or other changes. These cautionary statements qualify all forward-looking statements attributable to us or persons acting on our behalf. This presentation may contain the financial measures: adjusted net income, EBITDA, adjusted EBITDA, and adjusted EPS, which are not calculated in accordance with U.S. GAAP. If presented, a reconciliation of the non-GAAP financial measures to the most directly comparable GAAP financial measure will be provided in the Appendix to this presentation.

AT A GLANCE Orion is a leading specialty construction company focused on mission-critical projects on, over, and under the water KEY STATISTICS $852M 2025 Revenue $45M 2025 Adj. EBITDA $668M March 2026 Backlog ~2,000 Employees Marine Comprehensive engineering, construction, jetty & breakwater construction, dredging and specialty services SERVICES Concrete Construction services for commercial, structural, high-rise residential and industrial SAFETY RECORD AND RECOGNITIONS $900M - $950M 2026 Revenue Guidance $54M - $58M 2026 Adj. EBITDA Guidance World-class safety record 2025 Lost Time Incident Rate (LTIR): 0.13 vs. industry average of 2.3 Recognitions • #2 in Marine Ports (ENR) - 2025 • #15 in Concrete (ENR) - 2025 • NASA Causeway: 2025 ENR Best Project in the Southeast • CEO Travis Boone named EY Entrepreneur Of The Year® 2025 Finalist

4 ORION INVESTMENT APPEALS Mission critical specialty construction provider with sustainable competitive advantages 1 Poised to benefit from multiple powerful demand drivers and a robust, growing $24B pipeline 2 Clear, disciplined strategy built on strengthened foundation to drive increased value creation 3 Strong balance sheet that provides flexibility for strategic investment Experienced management team focused on strategy, execution and growth 4 5

High Barriers to Entry • Jones Act prohibits foreign competition in the U.S. marine market • Marine specialty equipment is unique and requires significant upfront investment to enter the market • Orion owns 1000+ pieces of specialty equipment with a replacement value of $600M • Legacy of high customer satisfaction on complex concrete projects • Long-standing, deep customer relationships Why We Win MISSION-CRITICAL SPECIALTY CONSTRUCTION PROVIDER WITH COMPETITIVE ADVANTAGES • Over 100 years of marine and civil engineering experience • Over 40 years of concrete construction expertise for a variety of industries • World-class safety record • Excellent reputation for delivering on time, on budget, with quality • Creative problem solver leveraging engineering group to deliver custom solutions • High-caliber leadership team and skilled workforce driving disciplined execution and growth

6 LARGE MARKET OPPORTUNITY WITH STRONG, DIVERSE TAILWINDS SUPPORTS $24B PIPELINE $1.2T Infrastructure Act Multi-year catalyst for public sector projects: transportation funding, ports, waterways, water infrastructure and bridges Port Expansion and Maintenance Larger ships via expanded Panama Canal require upgraded shipping channels and expanded infrastructure U.S. Navy Pacific Expansion U.S. Navy investments in infrastructure across Pacific to support DOD strategy Coastal Rehabilitation & Remediation Increased disaster recovery from regional weather events, environmental remediation and sea level rise Energy and Petrochem Security Investment in domestic energy, LNG, chemical and petrochemical facilities Data Center Demand AI driving need for more data centers and power generation across US U.S. Manufacturing Re-Shoring Tariff and tax incentives driving reshoring initiatives across the U.S. and demand for new structures Strong Political Tailwinds OBBBA and White House directives prioritizing restoration of maritime dominance with investment in shipyards, vessel upgrades, drydocks

7 MASSIVE U.S. NAVY OPPORTUNITY IN THE PACIFIC • U.S. Navy is procuring Multiple Award Construction Contracts for many billions in infrastructure projects throughout the Pacific • Scope includes new facilities, repair/renovation and upgrades to existing facilities, including wharves/piers, dredging, aprons, and more • Orion (with our partners) was selected on several MACC1 contracts, allowing ORN to compete on future task orders, limiting competition landscape Orion anticipates U.S. Navy funding for Pacific Deterrence and shipyard renovations to accelerate and continue for several years 1. MACC, or ‘Multiple Award Construction Contract’ is Indefinite-Delivery/Indefinite-Quantity (IDIQ) vehicle used by NAVFAC (Naval Facilities Engineering Systems Command) to award construction projects—such as waterfront work, piers, dredging support, facilities upgrades, utilities, etc.—to a pool of pre-qualified contractors.

• Strategic, accretive M&A Criteria: • Augment, add or enhance a capability • Strategic SMEs or equipment • Geographic expansion • Disciplined valuation • Earnings accretive • Capitalize on improving Marine construction opportunities driven by multiple tailwinds • Strong Concrete construction market in multiple sectors, led by data centers 8 CLEAR, DISCIPLINED STRATEGY BUILT ON A STRENGTHENED FOUNDATION TO DRIVE GROWTH • Expand geographically and into adjacent market offerings • Leverage an investment-light approach to expansion through strong client/partner relationships Driving organic growth Geographic Expansion Disciplined Operational Foundation Strategic Acquisitions • Focus on high-quality projects at healthy margins • Integrate all businesses onto unified platform to drive scale and efficiency • Improve project management and execution to increase margins • Recruit, develop, and retain highly-skilled talent

Deploy capital to drive profitable organic growth Maintain leverage ratio <2.5x Capitalize on strategic opportunities Structure and execute to maximize long-term shareholder value 9 40% savings Improvement in interest rate on bank debt(b) $52M March 31, 2026 Total Liquidity (c) Dec 2030 Senior Credit Facility Maturity a) Net Leverage Ratio calculated as Total Debt less Cash, divided by TTM Adjusted EBITDA b) Current annual weighted average interest rate for UMB credit agreement is 6.47% compared to the 2025 weighted average interest rate for our previous senior credit agreement of 10.7% c) Book cash plus excess availability on Revolving line of credit under the UMB credit agreement OPTIMIZING CAPITAL DEPLOYMENT FOR FUTURE GROWTH AND SHAREHOLDER VALUE Capital Deployment Priorities1 2 3 4 1.5x Net Leverage as of Mar 31, 2026(a)

Heavy Civil | Jetty & Breakwater | Marine | Environmental • 50 years of experience delivering Federal heavy civil construction-- recognized as jetty construction experts and “go-to” provider in harsh environments • Extends and strengthens geographic footprint in Washington, Oregon, Canada, Florida, Alaska, and Hawaii • Augments Orion’s equipment fleet with strategic, high-value marine assets, including multiple Jones Act Vessels • High cultural and values alignment • Consideration paid of $60M, plus additional contingent consideration; expected to be accretive to adj. EBITDA and margin • Closed February 3, 2026 Acquisition of J.E. MCAMIS, Strengthening Marine Capabilities

11 EXPERIENCED MANAGEMENT TEAM FOCUSED ON GROWTH AND FINANCIAL PERFORMANCE Travis Boone, PE Chief Executive Officer • Transformational leader with significant leadership and management experience across the civil, utility / pipeline and commercial building engineering and construction industries • Prior to joining Orion, served as Regional Chief Executive of AECOM (NYSE:ACM) Travis Boone, PE Chief Executive Officer 30 Years of Experience • Multi-disciplinary finance leader across accounting, tax, FP&A, treasury, financial systems, investor relations, and government compliance. • Further experience in mergers, acquisitions and financial transactions • Former CAO of KBR, Inc. (NYSE:KBR) and previously held leadership positions within KBR finance organization Alison Vasquez Chief Financial Officer 25 Years of Experience • Experience spans global legal, compliance, risk management and oversight across multiple industries • Further experience in corporate and securities law, M&A, corporate governance, legal operations, compliance and contract management • Previous roles have included GC of Newpark Resources and Bristow Group and executive leadership at Transocean Chip Earle General Counsel 25 Years of Experience • Senior Vice President of Strategy & Growth since July 2023 • Experience spans project development, business development leadership, organizational efficiency and innovative & alternative delivery • Prior to joining Orion, held leadership positions at AECOM, most notably as VP of Business Development for ten years Alan Eckman Senior Vice President, Strategy & Growth 25 Years of Experience • SVP of Operations since 2019 • Prior experience in implementing cost savings strategies and project forecasting / controls improvements • Has held multiple construction, project management positions with companies including Kiewit and Zachry Construction Ardell Allred Executive Vice President, Concrete 30 Years of Experience • Most recently SVP at Texas Sterling Construction • Executive-level experience in restructuring, negotiation and resolution as well as division level management with profit and loss responsibilities • Previously held construction and project management positions at companies including Kiewit, Zachry Construction Scott Cromack Executive Vice President, Marine 30 Years of Experience

12 MISSION-CRITICAL MARINE INFRASTRUCTURE PLATFORM ALIGNED WITH LONG-TERM DEFENSE AND PORT INVESTMENT Construction Dredging Specialty General construction, restoration, maintenance & repair of ports and docks, jetty & breakwater, marine pipelines, marine transportation facilities, bridges and environmental structures Removal of soil, sand and rock from waterways to enhance and preserve navigability Design, salvage, demolition, towing and diving as well as underwater inspection, excavation, repair and engineering $545M $480M $80M 14.7% 2025 Revenue December Backlog 2025 Adj. EBITDA 2025 Adj. EBITDA Margin Construction solutions spanning port expansion & maintenance, jetty & breakwater, bridge, causeway and marine infrastructure construction services to customers across diversified end markets in the U.S., Pacific Islands, Western Canada, and Caribbean $120M Grand Bahama Shipyard contract: building the first floating dry docks in Atlantic to lift the largest cruise ships in the world $460M U.S. Navy contract to build submarine dry dock at Pearl Harbor 2025 Results

Data centers, office buildings and complexes, tilt wall warehouses, airport facilities, medical facilities, retail sites, cold storage, and education facilities High-rise buildings, complexes, and stadiums Commercial Structural Wastewater treatment, tank foundations, site work, and terminals and manufacturing sites Industrial Turnkey concrete construction services including place and finish, site work, layout, forming and rebar for clients across manufacturing, data center, institutional, industrial, commercial construction, and multi-family construction end markets with hubs in Texas, Florida, and Arizona 13 DIVERSIFIED CONCRETE CAPABILITIES ALIGNED WITH DATA CENTER, INDUSTRIAL AND COMMERCIAL GROWTH Data centers and campuses High Rise Buildings 50+ 2025 Results $307M $160M $12M 3.9% 2025 Revenue December Backlog 2025 Adj. EBITDA 2025 Adj. EBITDA Margin

FINANCIAL PERFORMANCE 14

$17 $23 $24 $42 2021 2022 2023 2024 2025 2026E Adjusted EBITDA $45 $56 15 HISTORICAL ANNUAL FINANCIAL SUMMARY ($ in millions) $601 $748 $712 $796 $852 $925 2021 2022 2023 2024 2025 2026E Revenue 2021 Guidance Midpoint Guidance Midpoint • 2026 Revenue guidance midpoint signals expected growth • 2026 Revenue guidance represents 54% growth since 2021 • 9% CAGR from 2021-2026 • 2026 Adjusted EBITDA guidance more than triples from 2021 • Adjusted EBITDA guidance represents 27% CAGR from 2021-2026

16 FIRST QUARTER 2026 RESULTS Q1 2026 Q1 2025 Growth Revenue $216M $189M 15% GAAP EPS $0.12 ($0.04) +$0.16 Adjusted EBITDA $8.7M $8.2M 7% Adjusted EPS $0.05 $0.01 +$0.04 Adjusted EBITDA Margin 4.0% 4.3% __

17 RECORD $24B OPPORTUNITY PIPELINE TO SUPPORT FUTURE GROWTH $5B $7B $12B $0-$50M $50M-$200M $200M+ Total Pipeline by Anticipated Opportunity Size 75% 25% Total Pipeline by Sector Public Private Total Pipeline by Segment Marine Concrete 10% 90% $8B $8B $8B 2026 2027 Beyond Total Pipeline by Anticipated Award Date

18 FISCAL YEAR 2026 GUIDANCE (AS OF APRIL 28, 2026) FY2026 Revenue $900M to $950M, a 9% annual increase at the midpoint Adjusted EBITDA $54M to $58M, a 24% annual increase at the midpoint Adjusted EPS $0.36 to $0.42, a 56% annual increase at the midpoint Capex $25M to $35M

0 100 200 300 400 500 600 700 800 900 1000 New management joined Orion 19 RECENT EVOLUTION OF BACKLOG BACKLOG ($ in millions) RECENT WINS Manufacturing Facilities USACE Sargent Beach Jetty and Beach Renourishment Project Bridge Replacement Terminal Wharf Expansion Contract in Texas

APPENDIX 20

21 VALUED PARTNER TO HIGHLY DIVERSIFIED CUSTOMER BASE ENERGY DATA CENTERS GOVERNMENT OTHER Long-tenured relationships with customers across federal, state & local government and private enterprise

NON-GAAP SUPPLEMENTAL INFORMATION 22 Orion Group Holdings, Inc. and Subsidiaries Adjusted EBITDA and Adjusted EBITDA Margin Reconciliations (In Thousands, Except Margin Data) (Unaudited) Three Months Ended March 31, 2026 2025 Net income (loss) $ 4,687 $ (1,414) Income tax (benefit) expense (6,852) 140 Interest expense, net 1,444 2,141 Depreciation and amortization 6,387 5,403 EBITDA(1) 5,666 6,270 Non-cash share-based compensation 1,387 1,123 ERP implementation 81 605 Severance — 30 Process improvement initiatives — 138 Acquisition and integration costs 1,613 — Adjusted EBITDA(2) $ 8,747 $ 8,166 Adjusted EBITDA margin(2) 4.0 % 4.3 % (1) EBITDA is a non-GAAP measure that represents earnings before interest, taxes, depreciation and amortization. (2) Adjusted EBITDA is a non-GAAP measure that represents EBITDA adjusted for non-cash share-based compensation, ERP implementation, severance, process improvement initiatives and acquisition and integration costs. Adjusted EBITDA margin is a non-GAAP measure calculated by dividing Adjusted EBITDA by contract revenues.

NON-GAAP SUPPLEMENTAL INFORMATION 23 Orion Group Holdings, Inc. and Subsidiaries Reconciliation of Adjusted Net Income (Loss) (In thousands except per share information) (Unaudited) Three Months Ended March 31, 2026 2025 Net income (loss) $ 4,687 $ (1,414) Adjusting items and the tax effects: Non-cash share-based compensation 1,387 1,123 ERP implementation 81 605 Severance — 30 Process improvement initiatives — 138 Acquisition and integration costs 1,613 — Amortization of purchased intangibles 390 — Tax rate of 23% applied to adjusting items(1) (798) (436) Reversal of the impact of valuation allowances (5,395) 214 Adjusted net income $ 1,965 $ 260 Adjusted EPS $ 0.05 $ 0.01 (1) Items are taxed discretely using the Company's blended tax rate.

NON-GAAP SUPPLEMENTAL INFORMATION 24 For the three months ended March 31, 2026 Marine Concrete General Corporate Consolidated Contract revenues $ 110,129 $ 106,172 $ - $ 216,301 Operating income (loss) 6,580 7,736 (15,111) (795) Other income 22 — 52 74 Depreciation and amortization 4,981 700 706 6,387 EBITDA(1) 11,583 8,436 (14,353) 5,666 Non-cash share-based compensation 335 176 876 1,387 ERP implementation — — 81 81 Acquisition and integration costs — — 1,613 1,613 Adjusted EBITDA(2) $ 11,918 $ 8,612 $ (11,783) $ 8,747 Adjusted EBITDA margin(2) 10.8 % 8.1 % 4.0 % For the three months ended March 31, 2025 Marine Concrete General Corporate Consolidated Contract revenues $ 127,163 $ 61,490 $ - $ 188,653 Operating income (loss) 12,322 1,809 (13,298) 833 Other income — 10 24 34 Depreciation and amortization 4,378 872 153 5,403 EBITDA(1) 16,700 2,691 (13,121) 6,270 Non-cash share-based compensation 280 91 752 1,123 ERP implementation — — 605 605 Severance — 16 14 30 Process improvement initiatives 138 138 Adjusted EBITDA(2) $ 16,980 $ 2,798 $ (11,612) $ 8,166 Adjusted EBITDA margin(2) 13.4 % 4.6 % 4.3 % (1) EBITDA is a non-GAAP measure that represents earnings before interest, taxes, depreciation and amortization. (2) Adjusted EBITDA is a non-GAAP measure that represents EBITDA adjusted for non-cash share-based compensation, ERP implementation, severance, process improvement initiatives and acquisition and integration costs. Adjusted EBITDA margin is a non-GAAP measure calculated by dividing Adjusted EBITDA by contract revenues. Orion Group Holdings, Inc. and Subsidiaries Adjusted EBITDA and Adjusted EBITDA Margin Reconciliations (In Thousands, Except Margin Data) (Unaudited)

NON-GAAP SUPPLEMENTAL INFORMATION 25 Orion Group Holdings, Inc. and Subsidiaries Adjusted EBITDA and Adjusted EBITDA Margin Reconciliations (In Thousands, Except Margin Data) (Unaudited) Year Ending December 31, 2021 2022 2023 2024 2025 Net (loss) income $ (14,560) $ (12,612) $ (17,875) $ (1,644) $ 2,488 Income tax expense 502 429 330 348 419 Interest expense, net 4,940 4,352 11,556 13,174 8,223 Depreciation and amortization 25,430 24,057 23,878 22,765 22,262 EBITDA(1) 16,312 16,226 17,889 34,643 33,392 Non-cash share-based compensation 2,401 2,754 2,042 4,009 5,450 Net gain on Port Lavaca South Yard property sale — — (5,202) — — ERP implementation 4,925 1,867 1,378 2,129 1,367 Professional fees related to management transition — 1,118 — — — Severance 96 948 809 104 620 Intangible asset impairment loss — — 6,890 — — Process improvement initiatives — — — 982 138 Acquisition and integration — — — — 494 Loss on extinguishment of debt — — — — 3,777 Net gain on Tampa property sale (6,435) — — — — Adjusted EBITDA(2) $ 17,299 $ 22,913 $ 23,806 $ 41,867 $ 45,238 Adjusted EBITDA margin(2) 2.9 % 3.1 % 5.3 % 5.3 % 5.3 % (1) EBITDA is a non-GAAP measure that represents earnings before interest, taxes, depreciation and amortization. (2) Adjusted EBITDA is a non-GAAP measure that represents EBITDA adjusted for non-cash share-based compensation, net gain on Port Lavaca South Yard property sale, ERP implementation, professional fees related to management transition, severance, intangible impairment loss, process improvement initiatives, acquisition and integration, loss on extinguishment of debt and net gain on Tampa property sale. Adjusted EBITDA margin is a non-GAAP measure calculated by dividing Adjusted EBITDA by contract revenues.

NON-GAAP SUPPLEMENTAL INFORMATION 26 Orion Group Holdings, Inc. and Subsidiaries Adjusted EBITDA and Adjusted EBITDA Margin Reconciliations (In Thousands, Except Margin Data) (Unaudited) For the three months ended June 30, 2025 Marine Concrete General Corporate Consolidated Contract revenues $ 135,302 $ 69,984 $ - $ 205,286 Operating income (loss) 13,661 2,593 (12,822) 3,432 Other income — 1 23 24 Depreciation and amortization 4,226 858 147 5,231 EBITDA(1) 17,887 3,452 (12,652) 8,687 Non-cash share-based compensation 242 133 1,144 1,519 ERP implementation — — 225 225 Severance — — 547 547 Adjusted EBITDA(2) $ 18,129 $ 3,585 $ (10,736) $ 10,978 Adjusted EBITDA margin(2) 13.4 % 5.1 % 5.3 % For the three months ended September 30, 2025 Marine Concrete General Corporate Consolidated Contract revenues $ 142,944 $ 82,154 $ - $ 225,098 Operating income (loss) 19,444 481 (14,604) 5,321 Other income 100 2 109 211 Depreciation and amortization 4,404 811 677 5,892 EBITDA(1) 23,948 1,294 (13,818) 11,424 Non-cash share-based compensation 303 179 894 1,376 ERP implementation — — 301 301 Severance — — 31 31 Adjusted EBITDA(2) $ 24,251 $ 1,473 $ (12,592) $ 13,132 Adjusted EBITDA margin(2) 17.0 % 1.8 % 5.8 %

NON-GAAP SUPPLEMENTAL INFORMATION 27 Orion Group Holdings, Inc. and Subsidiaries Adjusted EBITDA and Adjusted EBITDA Margin Reconciliations (In Thousands, Except Margin Data) (Unaudited) For the three months ended December 31, 2025 Marine Concrete General Corporate Consolidated Contract revenues $ 139,422 $ 93,801 $ - $ 233,223 Operating income (loss) 16,282 3,273 (14,530) 5,025 Loss on extinguishment of debt — — (3,777) (3,777) Other income — 1 26 27 Depreciation and amortization 4,304 738 694 5,736 EBITDA(1) 20,586 4,012 (17,587) 7,011 Non-cash share-based compensation 348 181 903 1,432 ERP implementation — — 236 236 Severance — — 12 12 Acquisition and integration costs — — 494 494 Loss on extinguishment of debt — — 3,777 3,777 Adjusted EBITDA(2) $ 20,934 $ 4,193 $ (12,165) $ 12,962 Adjusted EBITDA margin(2) 15.0 % 4.5 % 5.6 % For the year ended December 31, 2025 Marine Concrete General Corporate Consolidated Contract revenues $ 544,831 $ 307,429 $ - $ 852,260 Operating income (loss) 61,709 8,156 (55,254) 14,611 Loss on extinguishment of debt — — (3,777) (3,777) Other income 100 14 182 296 Depreciation and amortization 17,312 3,279 1,671 22,262 EBITDA(1) 79,121 11,449 (57,178) 33,392 Non-cash share-based compensation 1,173 584 3,693 5,450 ERP implementation — — 1,367 1,367 Severance — 16 604 620 Process improvement initiatives — — 138 138 Acquisition and integration costs — — 494 494 Loss on extinguishment of debt — — 3,777 3,777 Adjusted EBITDA(2) $ 80,294 $ 12,049 $ (47,105) $ 45,238 Adjusted EBITDA margin(2) 14.7% % 3.9% % 5.3% % (1) EBITDA is a non-GAAP measure that represents earnings before interest, taxes, depreciation and amortization. (2) Adjusted EBITDA is a non-GAAP measure that represents EBITDA adjusted for non-cash share-based compensation, ERP implementation, severance, process improvement initiatives, acquisition and integration costs and loss on extinguishment of debt. Adjusted EBITDA margin is a non-GAAP measure calculated by dividing Adjusted EBITDA by contract revenues.

NON-GAAP SUPPLEMENTAL INFORMATION 28 Orion Group Holdings, Inc. and Subsidiaries Guidance – Adjusted EBITDA Reconciliation (In Thousands) (Unaudited) Year Ending December 31, 2026 Low Estimate High Estimate Net income $ 11,500 $ 15,300 Income tax expense 400 600 Interest expense, net 7,700 7,700 Depreciation and amortization 25,400 25,400 EBITDA(1) 45,000 49,000 Non-cash share-based compensation 7,200 7,200 ERP implementation 1,800 1,800 Acquisition and integration costs(2) — — Adjusted EBITDA(3) $ 54,000 $ 58,000 (1) EBITDA is a non-GAAP measure that represents earnings before interest, taxes, depreciation and amortization. (2) Amounts related to acquisition and integration costs are not yet available because the purchase accounting for the acquisition is still in process. Accordingly, these amounts have not been included in this reconciliation and will be reflected in a future period once the purchase accounting is finalized. (3) Adjusted EBITDA is a non-GAAP measure that represents EBITDA adjusted for share-based compensation, ERP implementation, and acquisition and integration costs.

NON-GAAP SUPPLEMENTAL INFORMATION 29 Orion Group Holdings, Inc. and Subsidiaries Guidance – Adjusted EPS Reconciliation (In Thousands except per share information) (Unaudited) Year Ending December 31, 2026 Low Estimate High Estimate Net income $ 11,500 $ 15,300 Adjusting items and the tax effects: Non-cash share-based compensation 7,200 7,200 ERP implementation 1,800 1,800 Acquisition and integration costs(1) — — Amortization of purchased intangibles(1) — — Tax rate of 23% applied to adjusting items(2) (2,100) (2,100) Reversal of the impact of valuation allowances (3,700) (5,000) Adjusted net income(3) $ 14,700 $ 17,200 Adjusted EPS(3) $ 0.36 $ 0.42 (1) Amounts related to acquisition and integration costs and amortization of purchased intangibles are not yet available because the purchase accounting for the acquisition is still in process. Accordingly, these amounts have not been included in this reconciliation and will be reflected in a future period once the purchase accounting is finalized. (2) Items are taxed discretely using the Company's blended tax rate. (3) Adjusted net income and Adjusted EPS are non-GAAP measures that represent net income adjusted for share-based compensation, ERP implementation, acquisition and integration costs and amortization of purchased intangibles.


Delaware	1-33891	26-0097459
(State or other jurisdiction of incorporation)	(Commission File Number)	(IRS Employer Identification Number)


Title of Each Class		Trading Symbol(s)		Name of Each Exchange on Which Registered
Common stock, $0.01 par value per share		ORN		The New York Stock Exchange
Common stock, $0.01 par value per share		ORN		NYSE Texas


Exhibit No.	Description

99.1	Press Release of Orion Group Holdings, Inc. dated April 28, 2026.
99.2	Investor Presentation, dated April 2026.
104	Cover Page Interactive Data File (embedded within the Inline XBRL document).


Exhibit No.	Description

99.1	Press Release of Orion Group Holdings, Inc. dated April 28, 2026.
99.2	Investor Presentation, dated April 2026.
104	Cover Page Interactive Data File (embedded within the Inline XBRL document).


	Orion Group Holdings, Inc.
Dated: April 29, 2026	By:	/s/ Travis J. Boone
		President and Chief Executive Officer