What Marinex Construction Inc does

Marinex Construction, Inc. is a privately held marine construction company founded in 1991 by F. Hammond Johnson and headquartered in Charleston, South Carolina. The company specializes in channel and fill dredging, river and harbor improvements, shoreline protection and beach renourishment, environmental restoration, and containment area management for federal, state, and local government customers along the U.S. Southeast coast from Norfolk, Virginia to Tampa, Florida.

Its core technical capability rests on two purpose-built cutter suction dredges, the Hampton Roads (19-inch, 5,800 HP) and the Savannah (24-inch, 9,500 HP), supported by 3D Modeling and Road Works tooling for project execution and partner coordination. The company places approximately 750,000 cubic yards of beach nourishment material per project and moves 3 to 6 million cubic yards on harbor maintenance scopes.

Revenue is generated through project-based government contracts awarded via competitive bidding, with the U.S. Army Corps of Engineers (Charleston, Savannah, and Jacksonville districts) as the primary contracting authority and coastal municipalities as secondary buyers. Disclosed contract values range from $8.3 million to $24.6 million, with multi-year performance horizons. Marinex employs more than 100 people, many with 30+ years of dredging experience, and operates without resellers or third-party distribution channels.

Name

Marinex Construction Inc

Legal name

Marinex Construction, Inc.

Website

https://marinexconstruction.com

Company type

Private

Founded year

1991

Operating status

Operating

Headcount range

11–50 employees

Short description

Marinex Construction is a privately held marine construction company founded in 1991 in Charleston, South Carolina, specializing in dredging, harbor improvements, and beach nourishment for federal and local government clients along the U.S. Southeast coast.

Ownership category

akta.pro rank

Product category

Marine Construction and Dredging Services

NAICS

Support Activities for Water Transportation (4883)

SIC

Heavy Construction Other Than Bldg Const - Contractors (1600)

akta.pro primary industry

Dredging & Channel Deepening (Capital & Maintenance) (IMAFAJAB)

akta.pro secondary industries

Port & Harbor Construction (Quays, Wharves, Berths) (IMAFAJAA), Marine Terminals & Cargo Handling Infrastructure (RoRo, Bulk, Container) (IMAFAJAF), Port Rehabilitation, Maintenance & Asset Renewal (Repairs, Strengthening) (IMAFAJAL)

Keywords

• Marine construction services
• Channel dredging
• Harbor improvements
• Beach nourishment
• Shoreline protection

Headquarters

HQ city

Charleston

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Infrastructure, Operations, Supply Chain

Revenue model

1. Government Construction Contracts: Marinex generates revenue through awarded government contracts for marine construction, dredging, and beach nourishment projects. Contracts are typically awarded through competitive bidding by U.S. Army Corps of Engineers and local government agencies. Revenue is project-based and varies by contract size.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels2 records

Core offering

Marinex Construction, Inc. provides marine construction and dredging services to government clients, including channel and fill dredging, harbor deepening and improvements, shoreline protection and beach nourishment, river and channel maintenance, environmental restoration, and containment area management. Services are delivered directly through awarded government contracts, primarily with the U.S. Army Corps of Engineers and coastal municipalities in the Southeast U.S., executed using the company's own fleet of cutter suction dredges (Hampton Roads and Savannah).

Product overview

Marinex Construction Inc is a marine construction company that operates as a unified service provider rather than a modular software platform. The company offers a portfolio of interconnected dredging and marine construction services, including channel and fill dredging, river and harbor improvements, shoreline protection and beach nourishment, environmental restoration, and containment area management. The services are supported by the company's two primary dredging assets: the Hampton Roads Dredge (a 19-inch cutter suction vessel with 5,800 HP) and the Savannah Dredge (a 24-inch cutter suction vessel with 9,500 HP). The company uses state-of-the-art equipment and cutting-edge technology including 3D Modeling and Road Works to enhance projects and communication with partners.

Differentiator

Problem solved

Functional benefit

Quantifiable outcome

• Places approximately 750,000 cubic yards of material for beach nourishment projects
• +2 more outcomes

Named customers4 records

Segments1 record

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

One partnership is on record.

• Crowder Construction CompanyminorStrategic or Co-development Partner · 1 January 2017Marinex and Crowder Construction Company worked simultaneously on the Edisto Beach restoration project. Marinex handled beach renourishment (moving sand from offshore) while Crowder repaired and extended 26 groins. The companies coordinated closely on the combined beach protection effort.

Scale indicators7 records

Recent moves5 records

Expansion highlights3 records

Direct peers

• Callan Marine: Gulf Coast dredging contractor performing navigation and beach nourishment projects for USACE districts, with comparable cutter suction and mechanical dredging capacity. Comparable in operational profile and bid-comp set.
• Taylor Dredging LLC: Specialty contractor focused on dredging and marine infrastructure for federal and municipal clients on the U.S. East and Gulf Coasts. Comparable in core capability and customer profile.
• Manson Construction Co. Privately held marine construction and dredging contractor performing channel deepening, beach nourishment, and harbor work for USACE and ports nationwide. Directly comparable in services, fleet profile, and federal contracting approach.
• Cashman Dredging & Marine Contracting: East Coast-based dredging and marine contractor performing channel deepening, harbor improvements, and beach nourishment for federal and state clients. Highly comparable in geography, fleet, and competitive set.
• Weeks Marine: Long-established family-owned marine construction and dredging company with cutter suction and hopper dredges executing USACE navigation, beach nourishment, and coastal restoration work. Closely comparable in scale, fleet, and customer base.
• Norfolk Dredging Company: Mid-Atlantic marine construction and dredging firm with similar service portfolio (channel work, beach nourishment, harbor improvement) for federal and municipal customers. Closely comparable in scope and contract size.
• Halmar International / Halmar LLC: Marine and heavy civil contractor performing dredging, pier construction, and coastal protection for USACE and port authorities along the East Coast. Comparable in fleet, services, and federal procurement experience.

Broad incumbents

• Great Lakes Dredge & Dock Corporation: Largest U.S. dredging contractor (Nasdaq: GLDD) operating the same core business — capital, coastal protection, and maintenance dredging — for USACE and other federal clients. Directly comparable business model and customer set, but with national scale and a public-market capital structure.
• Orion Group Holdings: Public marine and heavy civil contractor (NYSE: ORN) with a dedicated dredging and marine construction segment serving USACE, ports, and energy customers. Comparable in core dredging scope with broader cross-segment capability.

Regional players

• Cottrell Contracting Corporation: Virginia-based marine construction and dredging firm working along the Mid-Atlantic coast on similar channel, beach, and harbor scopes for USACE districts that overlap with Marinex's footprint. Comparable in service mix but more regionally focused.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat3 records

Key risks1 record

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/marinex-construction-inc

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Marinex Construction Inc