Great Lakes Dredge & Dock CORP: insider trades · United States · SEC (Form 4)

About Great Lakes Dredge & Dock CORP

Great Lakes Dredge & Dock CORP (ticker: GLDD) is a U.S.-listed company traded on the Nasdaq in the United States and is the largest provider of dredging services in the country. Founded in 1890 in Illinois as Lydon & Drews Partnership and renamed Great Lakes Dredge & Dock Company in 1905, the business is now headquartered in Houston, Texas. For French-speaking investors, it is best understood as a marine infrastructure and coastal engineering specialist with a long operating history tied to ports, waterways, shoreline protection and environmental restoration. The company’s core business is dredging, including maintenance dredging, capital dredging, beach nourishment, coastal protection and related marine construction services. Great Lakes also participates in projects linked to inland channels, river systems, port deepening and large-scale civil marine works. It operates a diversified fleet of dredges and support vessels, backed by engineering, estimating, production and project management capabilities that allow it to execute technically complex projects. Although the company reports as a single operating segment, its customer base spans public and private markets, with a meaningful dependence on U.S. federal spending, especially through the U.S. Army Corps of Engineers, as well as on port, LNG and coastal infrastructure projects. From a competitive standpoint, Great Lakes holds a leading position in the U.S. dredging market and is commonly described by the company as the largest dredging services provider in the United States. That scale matters because the industry is capital intensive, regulated and project-based, with barriers to entry created by fleet requirements, technical know-how, bonding capacity and long-standing customer relationships. Great Lakes also has substantial overseas experience, which broadens its opportunity set beyond domestic public works. In addition, management has been actively building exposure to offshore energy, particularly offshore wind-related subsea rock installation and cable-protection services. This is a strategic diversification, although dredging remains the dominant earnings driver. Geographically, the company serves the U.S. East Coast, Gulf Coast, Great Lakes region and inland waterways, with marine yards and regional operating bases supporting project execution. Recent developments have been important for the investment case. In 2025, Great Lakes announced multiple dredging awards, including work tied to the Woodside Louisiana LNG project and Mississippi River maintenance contracts. The company also highlighted progress on its newbuild program, including delivery of the Amelia Island hopper dredge and the Acadia vessel, designed for offshore energy and subsea infrastructure markets. Another major recent headline came in 2026, when Great Lakes and Saltchuk Resources announced a transaction that would take the company into Saltchuk’s family of companies, a development that could reshape the equity story for GLDD shareholders.