# EDGAR Filing Document

**Accession Number:** 0001372020
**File Stem:** 0000950170-23-009731
**Filing Date:** 2023-3
**Character Count:** 4716
**Document Hash:** e5998f8553e3165cfcd624f58d335c8f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000950170-23-009731.hdr.sgml**: 20230324

**ACCESSION NUMBER**: 0000950170-23-009731

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 4

**FILED AS OF DATE**: 20230324

**DATE AS OF CHANGE**: 20230324

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Great Lakes Dredge & Dock CORP
- **CENTRAL INDEX KEY:** 0001372020
- **STANDARD INDUSTRIAL CLASSIFICATION:** HEAVY CONSTRUCTION OTHER THAN BUILDING CONST - CONTRACTORS [1600]
- **IRS NUMBER:** 205336063
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-33225
- **FILM NUMBER:** 23759990

**BUSINESS ADDRESS:**
- **STREET 1:** 9811 KATY FREEWAY
- **STREET 2:** SUITE 1200
- **CITY:** HOUSTON
- **STATE:** TX
- **ZIP:** 77024
- **BUSINESS PHONE:** (346) 359-1010

**MAIL ADDRESS:**
- **STREET 1:** 9811 KATY FREEWAY
- **STREET 2:** SUITE 1200
- **CITY:** HOUSTON
- **STATE:** TX
- **ZIP:** 77024

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Great Lakes Dredge & Dock Holdings Corp.
- **DATE OF NAME CHANGE:** 20060808

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION<br>Washington, D.C. 20549**

**SCHEDULE 14A**

Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

(Amendment No.)

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐ Preliminary Proxy Statement

☐ **Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))**

☐ Definitive Proxy Statement

☒ Definitive Additional Materials

☐ Soliciting Material Pursuant to §240.14a-12

![img151656124_0.jpg](img151656124_0.jpg)

**Great Lakes Dredge & Dock Corporation**

**(Name of Registrant as Specified In Its Charter)**

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):

☒ No fee required.

☐ Fee paid previously with preliminary materials.

☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

(Continued and to be signed on reverse side)

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![img151656124_1.jpg](img151656124_1.jpg)

Your Vote Counts! GREAT LAKES DREDGE & DOCK CORPORATION C/O BROADRIDGE CORPORATE ISSUER SOLUTIONS, INC. PO BOX 1342 BRENTWOOD, NY 11717 GREAT LAKES DREDGE & DOCK CORPORATION 2023 Annual Meeting Vote by May 2, 2023 11:59 PM ET You invested in GREAT LAKES DREDGE & DOCK CORPORATION and it's time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the stockholder meeting to be held on May 3, 2023. You are encouraged to access and review the proxy materials before voting. Vote Virtually at the Meeting\* May 3, 2023 1:00 P.M. Central Time Virtually at: www.virtualshareholdermeeting.com/GLDD2023 \*Please check the meeting materials for any special requirements for meeting attendance. Smartphone users Point your camera here and vote without entering a control number V1.1 For complete information and to vote, visit www.ProxyVote.com Control # D98491-P87551 Get informed before you vote View the Notice and Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to April 19, 2023. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy.

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![img151656124_2.jpg](img151656124_2.jpg)

THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. Vote at www.ProxyVote.com Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click "Sign up for E-delivery". Voting Items Board Recommends D98492-P87551 1 Year 1. Election of Directors Nominees: 2. To ratify Deloitte & Touche LLP as the Company's independent registered public accounting firm for the year ending December 31, 2023. 1a. Elaine J. Dorward-King 1b. Ryan J. Levenson 3. To approve, on a non-binding advisory basis, the Company's executive compensation. 4. To conduct an advisory vote on the frequency of an advisory vote on executive compensation. For For For For NOTE: Such other business as may properly come before the meeting or any adjournment thereof.

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