# EDGAR Filing Document

**Accession Number:** 0001372020
**File Stem:** 0001193125-26-136776
**Filing Date:** 2026-4
**Character Count:** 9545
**Document Hash:** 33e572de24bae68fe48fd8fd3a33f2e9
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-136776.hdr.sgml**: 20260401

**ACCESSION NUMBER**: 0001193125-26-136776

**CONFORMED SUBMISSION TYPE**: S-8 POS

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260401

**DATE AS OF CHANGE**: 20260401

**EFFECTIVENESS DATE**: 20260401

**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]
- **ORGANIZATION NAME:** 05 Real Estate & Construction
- **EIN:** 205336063
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** S-8 POS
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-150067
- **FILM NUMBER:** 26826908

**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

**As filed with the Securities and Exchange Commission on April 1, 2026** 

**Registration No. 333-150067** 

**Registration No. 333-185350** 

**Registration No. 333-218242** 

**Registration No. 333-256955** 

**Registration No. 333-287107** 

**Registration No. 333-287108** 

**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION** 

**WASHINGTON, D.C. 20549** 

**Post-Effective Amendment No. 1 to Form S-8 Registration Statement No. 333-150067** 

**Post-Effective Amendment No. 1 to Form S-8 Registration Statement No. 333-185350** 

**Post-Effective Amendment No. 2 to Form S-8 Registration Statement No. 333-218242** 

**Post-Effective Amendment No. 1 to Form S-8 Registration Statement No. 333-256955** 

**Post-Effective Amendment No. 1 to Form S-8 Registration Statement No. 333-287107** 

**Post-Effective Amendment No. 1 to Form S-8 Registration Statement No. 333-287108** 

***UNDER***

***THE SECURITIES ACT OF 1933***

**GREAT LAKES DREDGE & DOCK CORPORATION** 

**(Exact name of registrant as specified in its charter)** 

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| | |
|:---|:---|
| **Delaware** | **20-5336063** |
| **(State or other jurisdiction of**<br> **incorporation or organization)** | **(I.R.S. Employer**<br> **Identification No.)** |

---

**9811 Katy Freeway, Suite 1200** 

**Houston, Texas 77024** 

**(Address of Principal Executive Offices) (Zip Code)** 

**Great Lakes Dredge & Dock Corporation 2007 Long-Term Incentive Plan** 

**Great Lakes Dredge & Dock Corporation Employee Stock Purchase Plan** 

**Great Lakes Dredge & Dock Corporation 2017 Long-Term Incentive Plan** 

**Great Lakes Dredge & Dock Corporation 2021 Long-Term Incentive Plan** 

**Great Lakes Dredge & Dock Corporation 2021 Long-Term Incentive Plan, as Amended** 

**Great Lakes Dredge & Dock Corporation 2025 Employee Stock Purchase Plan** 

**(Full titles of the plans)** 

**Scott Kornblau** 

**Senior Vice President and Chief Financial Officer** 

**Great Lakes Dredge & Dock Corporation** 

**9811 Katy Freeway, Suite 1200** 

**Houston, Texas 77024** 

**(346) 359-1010** 

**(Name, address, including zip code, and telephone number, including area code, of agent for service)** 

***Copies to:***

**Philip Richter** 

**Ryan Messier** 

**Fried, Frank, Harris, Shriver & Jacobson LLP** 

**One New York Plaza** 

**New York, NY 10004** 

**(212) 859-8000** 

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

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| | | | |
|:---|:---|:---|:---|
| Large accelerated filer | ☒ | Accelerated filer | ☐ |
| Non-accelerated filer | ☐ | Smaller reporting company | ☐ |
|  |  | Emerging growth company | ☐ |

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If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐

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**DEREGISTRATION OF SECURITIES** 

These post-effective amendments (the "Post-Effective Amendments"), filed by Great Lakes Dredge & Dock Corporation, a Delaware corporation (the "Company"), remove from registration all shares of common stock, par value $0.0001 per share, of the Company (the "Common Stock") previously registered under the following Registration Statements on Form S-8 filed by the Company (collectively, the "Registration Statements") with the U.S. Securities and Exchange Commission (the "SEC") pertaining to the registration of shares of Common Stock.

---

| |
|:---|
| &nbsp;&nbsp;&nbsp;&nbsp; • [Registration No. 333-150067](http://www.sec.gov/Archives/edgar/data/1372020/000110465908022348/a08-9747_1s8.htm), which was previously filed with the SEC on April 3, 2008, registering 5,800,000 shares of Common Stock under the Great Lakes Dredge & Dock Corporation 2007 Long-Term Incentive Plan;<br>|
| &nbsp;&nbsp;&nbsp;&nbsp; • [Registration No. 333-185350](http://www.sec.gov/Archives/edgar/data/1372020/000119312512495506/d447675ds8.htm), which was previously filed with the SEC on December 7, 2012, registering 2,500,000 shares of Common Stock under the Great Lakes Dredge & Dock Corporation Employee Stock Purchase Plan;<br>|
| &nbsp;&nbsp;&nbsp;&nbsp; • [Registration No. 333-218242](http://www.sec.gov/Archives/edgar/data/1372020/000156459017011707/gldd-s8.htm), which was previously filed with the SEC on May 25, 2017, as amended by the [Post-Effective Amendment No. 1 (No. 333-218242)](http://www.sec.gov/Archives/edgar/data/1372020/000156459021032315/gldd-s8pos.htm), previously filed with the SEC on June 10, 2021, registering 5,000,000 shares of Common Stock under the Great Lakes Dredge & Dock Corporation 2017 Long-Term Incentive Plan;<br>|
| &nbsp;&nbsp;&nbsp;&nbsp; • [Registration No. 333-256955](http://www.sec.gov/Archives/edgar/data/1372020/000156459021032317/gldd-s8.htm), which was previously filed with the SEC on June 10, 2021, registering 1,500,000 shares of Common Stock under the Great Lakes Dredge & Dock Corporation 2021 Long-Term Incentive Plan;<br>|
| &nbsp;&nbsp;&nbsp;&nbsp; • [Registration No. 333-287107](http://www.sec.gov/Archives/edgar/data/1372020/000095017025067241/may_2025_s-8_2021_ltip_a.htm), which was previously filed with the SEC on May 8, 2025, registering 3,000,000 additional shares of Common Stock under the Great Lakes Dredge & Dock Corporation 2021 Long-Term Incentive Plan, as amended; and<br>|
| &nbsp;&nbsp;&nbsp;&nbsp; • [Registration No. 333-287108](http://www.sec.gov/Archives/edgar/data/1372020/000095017025067243/may_2025_s-8_espp_shares.htm), which was previously filed with the SEC on May 8, 2025, registering 2,500,000 shares of Common Stock under the Great Lakes Dredge & Dock Corporation 2025 Employee Stock Purchase Plan.<br>|

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On February 10, 2026, the Company entered into an Agreement and Plan of Merger (the "Merger Agreement") with Saltchuk Resources, Inc., a Washington corporation ("Parent"), and Huron MergeCo., Inc., a Delaware corporation and a wholly owned subsidiary of Parent ("Merger Sub"). On April 1, 2026, pursuant to the Merger Agreement, Merger Sub merged with and into the Company, with the Company surviving as a wholly owned subsidiary of Parent (the "Merger").

As a result of the Merger and the other transactions contemplated by the Merger Agreement, the Company has terminated all offerings of the Company's securities registered pursuant to its existing registration statements under the Securities Act of 1933, as amended, including the Registration Statements. The Company, by filing these Post-Effective Amendments, hereby terminates the effectiveness of the Registration Statements and removes from registration any and all plan interests and any and all securities registered for issuance under the Registration Statements that remain unsold as of the date hereof. This filing is made in accordance with an undertaking made by the Company in each of the Registration Statements to remove from registration by means of a post-effective amendment any securities that had been registered for issuance that remain unsold at the termination of the offering.

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SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused these Post-Effective Amendments to the Registration Statements on Form S-8 to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, State of Texas, on this April 1, 2026.

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| | |
|:---|:---|
| **GREAT LAKES DREDGE & DOCK CORPORATION** | **GREAT LAKES DREDGE & DOCK CORPORATION** |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;By: | /s/ Scott Kornblau |
|  | Name: Scott Kornblau |
|  | Title: Senior Vice President and Chief Financial Officer |

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No other person is required to sign these Post-Effective Amendments in reliance upon Rule 478 under the Securities Act of 1933, as amended.