GREAT LAKES

DREDGE & DOCK

CORPORATION

INVESTOR

PRESENTATION

AUGUST 2021

Dredging Worldwide Since 1890.

GREAT LAKES DREDGE & DOCK CORPORATION > INFRASTRUCTURE SOLUTIONS

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SAFE HARBOR

Forward-Looking Statements

This presentation includes "forward-looking" statements within the meaning of Section 27A of the Securities Act of 1933, Section 21E of the Securities Exchange Act of 1934, the Private Securities Litigation Reform Act of 1995 or in releases made by the SEC, all as may be amended from time to time. Such statements include declarations regarding the intent, belief, or current expectations of the Company and its management. The Company cautions that any such forward-looking statements are not guarantees of future performance, and involve a number of risks, assumptions and uncertainties that could cause actual results of the Company and its subsidiaries, or industry results, to differ materially from those expressed or implied by any forward-looking statements contained herein, including, but not limited to, as a result of the factors, risks and uncertainties described in securities filings of the Company made with the SEC, including the Company's most recent Report on Form 10-K and Form 10-Q. You should not place undue reliance upon these forward-looking statements provided herein are made only as of the date

hereof or as a specified date herein and the Company does not have or undertake any obligation to update or revise them, unless required by law.

Non-GAAP Measures

This presentation includes certain non-GAAP measures, including Adjusted EBITDA from continuing operations, Pro Forma Adjusted EBITDA from continuing operations and operational results excluding restructuring. In addition to providing key metrics for management to evaluate the Company's performance, we believe these measurements assist investors in their understanding of period-to-period operating performance and in identifying historical and prospective trends. Reconciliations of these non-GAAP financial measures to the most comparable GAAP measure are available in the Appendix. Investors are urged to consider these non-GAAP measures in addition to, and not in substitution for, measures prepared in accordance with GAAP.

GREAT LAKES DREDGE & DOCK CORPORATION > INFRASTRUCTURE SOLUTIONS

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TABLE OF CONTENTS

COMPANY OVERVIEW

INVESTMENT HIGHLIGHTS

FINANCIAL OVERVIEW

APPENDIX

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COMPANY OVERVIEW

GREAT LAKES DREDGE & DOCK CORPORATION > INFRASTRUCTURE SOLUTIONS

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ABOUT US SNAPSHOT

  • 131 YEAR HISTORY
  • DEEMED ESSENTIAL CRITICAL INFRASTRUCTURE SERVICE DURING COVID-19 PANDEMIC
  • DOMESTIC & INTERNATIONAL DREDGING
  • CAPITAL, COASTAL PROTECTION & RESTORATION
  • PORT DEEPENING, SHORELINE PROTECTION, BARRIER ISLANDS & LAND RECLAMATION
  • AN INCIDENT & INJURY-FREE® (IIF®) COMPANY

LTM REVENUE $696 MILLION

LTM EBITDAª $109 MILLION

COMPANY BACKLOG $454 MILLION

$ as of June 30, 2021

GREAT LAKES DREDGE & DOCK CORPORATION > INFRASTRUCTURE SOLUTIONS

(a) See Appendix for reconciliation of Net Income (Loss) to Pro Forma Adjusted EBITDA

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Great Lakes Dredge & Dock Corporation published this content on 04 August 2021 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 04 August 2021 21:06:07 UTC.