ORION GROUP HOLDINGS REPORTS THIRD QUARTER 2026 RESULTS

ORION GROUP HOLDINGS REPORTS THIRD QUARTER 2026 RESULTS HOUSTON – October 27, 2026 – Orion Group Holdings, Inc. (NYSE: ORN; NYSE TX: ORN) (the “Company” or “Orion”), a leading specialty construction company, today reported its financial results for the third quarter ended September 30, 2026. Highlights for the quarter ended September 30, 2026 ●Revenue of $256.2 million, GAAP net income of $5.5 million, or $0.14 per diluted share, Adjusted EBITDA of $17.9 million, and Adjusted EPS of $0.12 per diluted share ●Booked awards and change orders of $179 million; won positions on two additional U.S. Navy Multiple Award Construction Contracts (“MACC”) ●Reiterated full year 2026 financial guidance “We delivered a strong third quarter, marked by double-digit revenue growth, expanding profitability and margins, and solid bookings and awards. These results reflect the health of our end markets and our commitment to delivering with predictable excellence,” said Travis Boone, President and Chief Executive Officer of Orion. “We expect this momentum to continue into the fourth quarter, and we are pleased to reiterate our 2026 annual guidance.” “The Concrete segment delivered an outstanding quarter, highlighted by top- and bottom-line growth with excellent margin expansion benefitted by strong execution. Activity remains robust across mission-critical and large-scale infrastructure markets, supported by our geographic growth, broader site civil services, and a diverse mix of project awards.” “In Marine, end markets remain strong, and we are actively engaging early on large, complex projects, sharpening our competitive positioning. Our recent selection on two additional U.S. Navy MACC contract vehicles broadens our access to significant federal opportunities. Continued investment in defense, port, and maritime infrastructure reinforces our confidence in Orion’s outlook and our ability to create long-term shareholder value,” concluded Boone. 1 Third Quarter 2026 Results Quarter Ended Amounts in millions, except per share information September 30, September 30, 2026 2025 Revenue $ 256.2 $ 225.1 GAAP Net Income $ 5.5 $ 3.3 GAAP Earnings Per Share (“EPS”) $ 0.14 $ 0.08 Adjusted EBITDA $ 17.9 $ 13.1 Adjusted EPS $ 0.12 $ 0.09 See definitions and reconciliation of non-GAAP measures elsewhere in this release. Contract revenues of $256.2 million in the third quarter of 2026 increased $31.1 million, or 14%, from $225.1 million in the third quarter of last year. The increase was driven by double-digit growth in both operating segments reflecting highly active projects, disciplined execution, favorable operating conditions, and the acquisition of J.E. McAmis. Gross profit was $33.1 million in the third quarter of 2026, an increase of $3.3 million, or 11%, from $29.8 million in the third quarter of 2025. The increase was primarily driven by higher revenue volume and increased profitability in our Concrete segment attributable to strong execution, partially offset by Marine close-out benefits in 2025 that did not recur in 2026. Selling, general and administrative expenses were $24.7 million for the third quarter of 2026, down from $25.1 million in the third quarter of last year. GAAP net income for the quarter ended September 30, 2026, was $5.5 million, or $0.14 per diluted share, compared to $3.3 million, or $0.08 per diluted share, in the third quarter of last year. Adjusted EBITDA for the third quarter of 2026 increased 37% to $17.9 million, compared to $13.1 million in the third quarter of 2025. Backlog Amounts in millions September 30, December 31, 2026 2025 Marine $ 506 $ 480 Concrete 139 160 Total $ 645 $ 640 Third quarter 2026 backlog included approximately $179 million in new awards. Third quarter Marine awards included a significant wharf repair for the U.S. Navy, the next phase of construction on the North Jetty project, and two projects in Hawaii. Recent Concrete awards included a large concrete paving package, new phases of data center campuses, a college research building, and a water treatment plant. 2 The Company won positions on two new MACC contract vehicles. The first is on the $9 billion U.S. Navy VENTI MACC, the largest procurement action in Naval Facilities Engineering Systems Command (“NAVFAC”) Northwest's history that encompasses a broad range of major construction projects across the region. The second is on the $700 million NAVFAC Northwest Waterfront MACC that is focused on the construction, repair and modernization of piers, wharves and other critical waterfront infrastructure. These programs are strategically important because they limit the pool of qualified contractors competing for future potential task orders under large federal programs. Balance Sheet Update As of September 30, 2026, working capital was $81 million, including unrestricted cash and cash equivalents of $5.7 million. Total debt outstanding was $109 million, with $83 million of outstanding borrowings under the UMB Credit Facility. FY 2026 Guidance The following forward-looking guidance reflects the Company’s current expectations and beliefs as of October 27, 2026, and is subject to change. The following statements apply only as of the date of this press release and are expressly qualified in their entirety by the cautionary statements included elsewhere in this press release. Estimated Range for Full-Year Ended December 31, 2026 Amounts in millions, except per share information and percentages Low High Annual Growth Estimate Estimate at Midpoint Revenue $ 900 $ 950 9 % Adjusted EBITDA $ 50 $ 54 15 % Adjusted EPS $ 0.23 $ 0.30 6 % Capital Expenditures $ 25 $ 35 — Conference Call Details Orion Group Holdings will host a conference call to discuss the third quarter 2026 financial results at 9:00 a.m. Eastern Time/8:00 a.m. Central Time on Wednesday, October 28, 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. 3 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 determined by methods other than in accordance with U.S. generally accepted accounting principles (“GAAP”) and are “non-GAAP financial measures” under rules of the U.S. 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 whose timing or amount cannot be reasonably estimated, or items not indicative of core operating performance 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, such as non-cash share-based compensation, enterprise resource planning implementation, severance, process improvement initiatives and acquisition and integration costs. 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. 4 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 exercise of 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 impact 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, integration risk, availability of liquidity, labor availability, labor-cost inflation, subcontractor performance, equipment availability, and supply-chain disruptions. The selection of the Company as one of multiple qualified contractors on MACC contracts may not result in the Company being awarded work or generating revenues or profit from any awarded work. 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 mboyce@orn.net Source: Orion Group Holdings, Inc. 5 Orion Group Holdings, Inc. and Subsidiaries Condensed Consolidated Statements of Operations (In Thousands, Except Share and Per Share Information) (Unaudited) Three Months Ended Nine Months Ended September 30, September 30, 2026 2025 2026 2025 Contract revenues $ 256,152 $ 225,097 $ 694,331 $ 619,037 Costs of contract revenues 223,012 195,345 612,385 540,473 Gross profit 33,140 29,752 81,946 78,564 Selling, general and administrative expenses 24,727 25,059 75,831 70,378 Gain on disposal of assets, net (108) (628) (296) (1,400) Operating income 8,521 5,321 6,411 9,586 Other (expense) income: Interest expense (2,950) (2,120) (6,986) (7,373) Other income 290 417 600 761 Other expense, net (2,660) (1,703) (6,386) (6,612) Income before income taxes 5,861 3,618 25 2,974 Income tax expense (benefit) 388 317 (5,990) 246 Net income $ 5,473 $ 3,301 $ 6,015 $ 2,728 Basic income per share $ 0.14 $ 0.08 $ 0.15 $ 0.07 Diluted income per share $ 0.14 $ 0.08 $ 0.15 $ 0.07 Shares used to compute income per share Basic 40,512,146 39,776,096 40,368,555 39,535,151 Diluted 40,518,633 39,787,227 40,385,830 39,544,405 6 Orion Group Holdings, Inc. and Subsidiaries Reconciliation of Adjusted Net Income (In Thousands, Except Per Share Information) (Unaudited) Three Months Ended Nine Months Ended September 30, September 30, 2026 2025 2026 2025 Net income $ 5,473 $ 3,301 $ 6,015 $ 2,728 Adjusting items and the tax effects: Non-cash share-based compensation 2,094 1,376 5,487 4,018 Enterprise resource planning (“ERP”) implementation — 301 135 1,131 Severance 21 31 21 608 Process improvement initiatives — — — 138 Acquisition and integration costs 187 — 1,821 — Amortization of purchased intangibles 471 — 1,256 — Tax rate of 23% applied to adjusting items (1) (638) (393) (2,006) (1,356) Reversal of the impact of valuation allowances (2,625) (1,157) (4,812) (867) Adjusted net income $ 4,983 $ 3,459 $ 7,917 $ 6,400 Adjusted EPS $ 0.12 $ 0.09 $ 0.20 $ 0.16 (1) Items are taxed discretely using the Company's blended tax rate. 7 Orion Group Holdings, Inc. and Subsidiaries Adjusted EBITDA and Adjusted EBITDA Margin Reconciliations (In Thousands, Except Margin Data) (Unaudited) Three Months Ended Nine Months Ended September 30, September 30, 2026 2025 2026 2025 Net income $ 5,473 $ 3,301 $ 6,015 $ 2,728 Income tax expense (benefit) 388 317 (5,990) 246 Interest expense, net 2,881 1,914 6,774 6,881 Depreciation and amortization 6,873 5,892 20,264 16,526 EBITDA (1) 15,615 11,424 27,063 26,381 Non-cash share-based compensation 2,094 1,376 5,487 4,018 ERP implementation — 301 135 1,131 Severance 21 31 21 608 Process improvement initiatives — — — 138 Acquisition and integration costs 187 — 1,821 — Adjusted EBITDA (2) $ 17,917 $ 13,132 $ 34,527 $ 32,276 Adjusted EBITDA margin (2) 7.0 % 5.8 % 5.0 % 5.2 % (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. 8 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 September 30, 2026 Marine Concrete General Corporate Consolidated Contract revenues $ 161,193 $ 94,959 $ — $ 256,152 Operating income (loss) 12,626 9,387 (13,492) 8,521 Other income 94 — 127 221 Depreciation and amortization 5,509 623 741 6,873 EBITDA (1) 18,229 10,010 (12,624) 15,615 Non-cash share-based compensation 516 260 1,318 2,094 Severance 10 — 11 21 Acquisition and integration costs — — 187 187 Adjusted EBITDA (2) $ 18,755 $ 10,270 $ (11,108) $ 17,917 Adjusted EBITDA margin (2) 11.6 % 10.8 % 7.0 % For the Three Months Ended September 30, 2025 Marine Concrete General Corporate Consolidated Contract revenues $ 142,943 $ 82,154 $ — $ 225,097 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 % (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. 9 Orion Group Holdings, Inc. and Subsidiaries Adjusted EBITDA and Adjusted EBITDA Margin Reconciliations by Segment (In Thousands, Except Margin Data) (Unaudited) For the Nine Months Ended September 30, 2026 Marine Concrete General Corporate Consolidated Contract revenues $ 402,165 $ 292,166 $ — $ 694,331 Operating income (loss) 26,908 21,321 (41,818) 6,411 Other income 190 — 198 388 Depreciation and amortization 16,015 2,090 2,159 20,264 EBITDA (1) 43,113 23,411 (39,461) 27,063 Non-cash share-based compensation 1,360 694 3,433 5,487 ERP implementation — — 135 135 Severance 10 — 11 21 Acquisition and integration costs — — 1,821 1,821 Adjusted EBITDA (2) $ 44,483 $ 24,105 $ (34,061) $ 34,527 Adjusted EBITDA margin (2) 11.1 % 8.3 % 5.0 % For the Nine Months Ended September 30, 2025 Marine Concrete General Corporate Consolidated Contract revenues $ 405,409 $ 213,628 $ — $ 619,037 Operating income (loss) 45,427 4,883 (40,724) 9,586 Other income 100 13 156 269 Depreciation and amortization 13,008 2,541 977 16,526 EBITDA (1) 58,535 7,437 (39,591) 26,381 Non-cash share-based compensation 825 403 2,790 4,018 ERP implementation — — 1,131 1,131 Severance — 16 592 608 Process improvement initiatives — — 138 138 Adjusted EBITDA (2) $ 59,360 $ 7,856 $ (34,940) $ 32,276 Adjusted EBITDA margin (2) 14.6 % 3.7 % 5.2 % (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. 10 Orion Group Holdings, Inc. and Subsidiaries Condensed Consolidated Statements of Cash Flows (In Thousands) (Unaudited) Nine Months Ended September 30, 2026 2025 Cash flows from operating activities Net income $ 6,015 $ 2,728 Adjustments to reconcile net income to net cash (used in) provided by operating activities: Depreciation and amortization 15,137 10,036 Amortization of right-of-use (“ROU”) operating leases 3,798 6,727 Amortization of ROU finance leases 5,127 6,490 Amortization of deferred debt issuance costs 250 900 Non-cash interest expense on seller note 1,025 — Deferred income taxes (6,007) 29 Share-based compensation 5,487 4,018 Gain on disposal of assets, net (296) (1,400) Allowance for credit losses 60 2,449 Change in operating assets and liabilities: Accounts receivable 32,638 (73,808) Income tax receivable (86) (255) Inventory (316) 637 Prepaid expenses and other 2,234 3,958 Contract assets (52,029) 43,889 Accounts payable (2,645) 11,550 Accrued liabilities (5,679) 4,765 Operating lease liabilities (4,169) (4,591) Income tax payable (43) (353) Contract liabilities (11,223) (3,509) Net cash (used in) provided by operating activities (10,722) 14,260 Cash flows from investing activities: Proceeds from sale of property and equipment 767 1,732 Purchase of property and equipment (28,109) (25,510) Business acquisition, net cash acquired (42,871) — Net cash used in investing activities (70,213) (23,778) Cash flows from financing activities: Borrowings on credit facilities 140,000 138,138 Payments on credit facilities (111,000) (138,451) Proceeds from term loan 55,011 — Payments on term loan (84) — Proceeds from deemed financing obligation 9,723 1,600 Principal payments on deemed financing obligation (2,556) (7,463) Loan costs related to credit facilities (419) (323) Payments of finance lease liabilities (7,074) (7,847) Employee stock plans, net activity (280) 465 Net cash provided by (used in) financing activities 83,321 (13,881) Net change in cash, cash equivalents and restricted cash 2,386 (23,399) Cash, cash equivalents and restricted cash at beginning of period 3,285 28,316 Cash, cash equivalents and restricted cash at end of period $ 5,671 $ 4,917 11 Orion Group Holdings, Inc. and Subsidiaries Condensed Consolidated Balance Sheets (In Thousands, Except Share and Per Share Information) September 30, December 31, 2026 2025 (Unaudited) ASSETS Current assets: Cash and cash equivalents $ 5,671 $ 1,588 Restricted cash — 1,697 Accounts receivable: Trade, net of allowance for credit losses of $3,283 and $3,461, respectively 128,792 175,695 Retainage 65,859 49,194 Income taxes receivable 342 256 Other current 4,611 3,531 Inventory 2,239 2,432 Contract assets 84,205 31,083 Prepaid expenses and other 8,067 12,686 Total current assets 299,786 278,162 Property and equipment, net of accumulated depreciation 137,558 88,210 Operating lease ROU assets, net of accumulated amortization 22,396 20,397 Finance lease ROU assets, net of accumulated amortization 21,709 18,360 Inventory, non-current 6,905 6,395 Other non-current 4,711 3,128 Goodwill 45,076 — Intangible assets, net of accumulated amortization 6,484 — Total assets $ 544,625 $ 414,652 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities: Current debt, net of debt issuance costs $ 9,408 $ 1,789 Accounts payable: Trade 105,815 107,433 Retainage 2,760 1,699 Accrued liabilities 43,913 31,750 Income taxes payable 154 197 Contract liabilities 43,572 49,104 Current portion of operating lease liabilities 4,316 4,418 Current portion of finance lease liabilities 8,855 7,517 Total current liabilities 218,793 203,907 Long-term debt, net of debt issuance costs 99,360 6,085 Operating lease liabilities 26,565 24,695 Finance lease liabilities 7,899 5,878 Other long-term liabilities 18,847 15,055 Total liabilities 371,464 255,620 Stockholders’ equity: Accumulated other comprehensive income 509 — Preferred stock -- $0.01 par value, 10,000,000 authorized, none issued — — Common stock -- $0.01 par value, 50,000,000 authorized, 41,307,485 and 40,612,139 issued; 40,596,254 and 39,900,908 outstanding at September 30, 2026 and December 31, 2025, respectively 413 406 Treasury stock, 711,231 shares, at cost, as of September 30, 2026 and December 31, 2025, respectively (6,540) (6,540) Additional paid-in capital 233,967 226,369 Retained loss (55,188) (61,203) Total stockholders’ equity 173,161 159,032 Total liabilities and stockholders’ equity $ 544,625 $ 414,652 12 Orion Group Holdings, Inc. and Subsidiaries Guidance – Adjusted EBITDA Reconciliation (In Thousands) (Unaudited) Year Ending December 31, 2026 Low Estimate High Estimate Net income $ 8,079 $ 12,079 Income tax benefit (5,400) (5,400) Interest expense, net 9,000 9,000 Depreciation and amortization 29,000 29,000 EBITDA (1) 40,679 44,679 Non-cash share-based compensation 7,300 7,300 Acquisition and integration costs 1,800 1,800 ERP implementation 200 200 Severance 21 21 Adjusted EBITDA (2) $ 50,000 $ 54,000 (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, acquisition and integration costs, ERP implementation and severance. 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 $ 8,079 $ 12,079 Adjusting items and the tax effects: Non-cash share-based compensation 7,300 7,300 Amortization of purchased intangibles 1,800 1,800 Acquisition and integration costs 1,800 1,800 ERP implementation 200 200 Severance 21 21 Tax rate of 23% applied to adjusting items (1) (2,600) (2,600) Reversal of the impact of valuation allowances (7,440) (8,340) Adjusted net income (2) $ 9,160 $ 12,260 Adjusted EPS (2) $ 0.23 $ 0.30 (1) Items are taxed discretely using the Company's blended tax rate. (2) Adjusted net income and Adjusted EPS are non-GAAP measures that represent net income adjusted for non-cash share-based compensation, amortization of purchased intangibles, acquisition and integration costs, ERP implementation and severance. 13