Main Iron Works
Main Iron Works is a Houma, Louisiana shipyard founded in 1947 that builds, repairs, and refurbishes tugboats, push boats, barges, and scallop boats for commercial marine transportation operators, with an ABS-certified machine shop and Subchapter M vessel construction capability.
- Company typePrivate
- Founded1947
- HeadquartersHouma, United States
- Headcount51–100
- GTM typeB2B
- OfferingHardware or Manufacturing
What Main Iron Works does
Main Iron Works, LLC is a privately held shipyard headquartered at the 50-mile marker of the Intracoastal Waterway in Houma, Louisiana, operating since 1947. The company specializes in construction, repair, and repowering of marine vessels, with core capabilities in tugboat construction (including ASD tractor tugs, Z-drive tugs, and conventional tugs), push boat construction, barge construction and refurbishing, and scallop boat fabrication. The company also operates a state-of-the-art, American Bureau of Shipping (ABS) certified machine shop housed in a 300' x 125' facility, equipped with overhead hoists, manual lathes (handling shafts up to 40'), a 400-ton shaft straightening press, CNC waterjet cutting table, and sub-arc welding machines, providing propeller shaft construction, rudder shaft services, steering components, water jetting, and specialized pump and prop repair. Main Iron Works holds Subchapter M certification for inland towing vessels and is capable of building Tier 4 emissions-compliant vessels.
The company's primary customers are large commercial marine transportation operators, with active or recent contracts with Bisso Towboat Inc. (12+ tugs historically), Kirby Inland Marine (three 2,680-hp Subchapter M-certified towboats), and Ingram Marine Group (ten tugs through 2024). The company is owned by Arlen "Benny" Cenac Jr. and operates as an independent entity under the Cenac Marine Services umbrella, which acquired it in July 2015. Revenue is generated through project-based custom vessel construction contracts and recurring ship repair, refurbishing, dry docking, and machine shop services, with pricing determined by vessel specifications, horsepower, and regulatory compliance requirements. The go-to-market model is direct enterprise sales targeting towboat, tugboat, and barge operators, with customer acquisition driven by industry reputation, long-term relationships, and repeat orders rather than active marketing.
Main Iron Works firmographics
Firmographics- Name
- Main Iron Works
- Legal name
- Main Iron Works, LLC
- Website
- https://mainironworks.com
- Company type
- Private
- Founded year
- 1947
- Operating status
- Operating
- Headcount range
- 51–100 employees
- Short description
- Main Iron Works is a Houma, Louisiana shipyard founded in 1947 that builds, repairs, and refurbishes tugboats, push boats, barges, and scallop boats for commercial marine transportation operators, with an ABS-certified machine shop and Subchapter M vessel construction capability.
- Ownership category
- akta.pro rank
Main Iron Works industry classification
Industry- Product category
- Shipbuilding & Marine Vessel Construction
- NAICS
- Ship Building and Repairing (336611)
- SIC
- Ship & Boat Building & Repairing (3730)
- akta.pro primary industry
- Steelwork & Fabrication Facilities (Plate/Section Processing, Welding Lines) (IMAJALAH)
- akta.pro secondary industries
- Mechanical Systems Repair (Engines, Propulsion, Pumps) (TLAKAKAF), Heavy Lifting & Material Handling Infrastructure (Goliath Cranes, Jib Cranes, Hoists) (IMAJALAD)
Keywords
Where Main Iron Works is headquartered
LocationHeadquarters
- HQ city
- Houma
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
Main Iron Works business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Personnel, Operations, Infrastructure, Supply Chain, Marketing or Sales
Revenue model
- New Vessel Construction: Building new tugboats, push boats, barges, and scallop boats for marine transportation companies. Projects include custom builds such as the 100' 6,008-hp Tier 4-compliant ASD tractor tug for Bisso Towboat and 2,680-hp towboats for Kirby Inland Marine.
- Ship Repair and Refurbishing: Dry docking, dockside repairs, refurbishes, rebuilds, and material upgrades for existing vessels. Includes barge construction and refurbishing services.
- Machine Shop Services: General machine work, propeller shaft construction and repair, rudder shaft services, steering components, water jetting, and specialized pump and prop repair services for external customers.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Multi-year contract | Custom vessel construction pricing based on vessel specifications, horsepower, and features |
Go-to-market motion2 records
Distribution channels1 record
Marketing channels3 records
Main Iron Works product offering
Product offeringCore offering
Main Iron Works is a Houma, Louisiana-based Tier II shipyard that builds, refurbishes, and repairs commercial marine vessels for inland waterway and coastal operators. Core deliveries include custom new construction of tugboats (ASD tractor tugs, Z-drive, and conventional tugs), push boats, barges, and scallop boats, alongside full-service ship repair, dry docking, dockside repairs, and ABS-certified machine shop services for propeller shafts, rudders, steering components, and specialized pump/prop repair.
Product overview
Main Iron Works is a shipbuilding and refurbishing company that operates as a single unified shipyard offering a comprehensive portfolio of marine vessel construction and repair services. The core offering centers on tug construction (including ASD tractor tugs, Z-drive tugs, and conventional tugs) along with push boat construction, barge construction/refurbishing, and scallop boat building. The company provides supporting services including dry docking, dockside repairs, ship refurbishing/rebuilds, material upgrades, and a certified machine shop. The shipyard has been operational since 1947 and is located in Houma, Louisiana at the 50-mile marker of the Intracoastal Waterway.
Differentiator
Problem solved
Functional benefit
Products and services
- Tug Construction Custom construction of tugboats including ASD tractor tugs, Z-drive tugs, and conventional tugs. Main Iron Works has built over 12 tugboats for Bisso Towboat Inc. and other marine transportation customers.
- Push Boat Construction Construction of push boats for inland waterway operations, including Subchapter M-certified vessels such as the 2,680-hp towboats built for Kirby Inland Marine.
- Scallop Boat Construction Specialty fishing vessel construction for the scallop harvesting industry.
- Barge Construction and Refurbishing Construction and refurbishing of flat-bottomed barges used for transporting heavy goods through rivers and canals.
- Ship Refurbishing and Rebuilds Refurbishing and rebuilding services for marine vessels, returning aging ships to operational condition with modern upgrades, systems, and material replacements.
- Dry Docking Dry dock services for marine vessels of various capacities, allowing hull repairs, maintenance, and inspection below the waterline.
- Dockside Repairs On-water repair services allowing vessels to receive maintenance and repairs without entering dry dock.
- Machine Shop Services American Bureau of Shipping certified machine shop offering general machine work, propeller shaft construction and repair, rudder shaft services, steering components, water jetting of parts, and specialized pump and prop repair for external marine customers.
Companies that use Main Iron Works
Customer profileNamed customers4 records
Segments3 records
Ideal customer profiles2 records
Main Iron Works technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature3 records
Main Iron Works partnerships and signals
Strategic signalPartnerships
Five partnerships are on record, tiered flagship, minor and core.
- Ingram Marine GroupflagshipMajor vessel construction partnership for 10 tugs. First vessel The Adrienne M. Moore delivered March 2021. Design collaboration between Main Iron Works, Ingram Marine Group, and Ashraf Degedy PE. Vessels feature Caterpillar C32 Tier 3 engines and Michigan special propellers. Plans include deliveries through 2024.
- South Louisiana Community College (SLCC)minorBenny Cenac donated a fully refurbished barge to SLCC's Maritime training program in November 2017. Cenac Marine captains serve as tankerman instructors during off time, certified through the state of Louisiana. The partnership supports maritime workforce development in the Houma community.
- Louisiana Workers Compensation Corporation (LWCC)coreLWCC is the largest workers compensation carrier in Louisiana, insuring over 16,000 entities. Main Iron Works (under Cenac Marine Services) is recognized as one of the top 70 safest policyholders. The partnership involves insurance coverage and workplace safety recognition programs.
- Kirby Inland MarineflagshipConstruction partnership for three 2,680-hp towboats. Kirby Inland Marine, one of the nation's largest tank barge operators with about 1,000 inland tank barges and 300 towboats, contracted Main Iron Works for Subchapter M-certified towboat construction. Vessel MV. Bailey delivered February 2019.
- Bisso Towboat Inc.flagshipLongstanding partnership building tugboats for Bisso Towboat. Contract for 100', 6,008-hp Tier 4-compliant ASD tractor tug announced August 2018. This was Main Iron Works' 12th tugboat built for Bisso. 'We are proud to partner with Bisso as they build the most powerful ship-assist tug on the Mississippi River.' - Benny Cenac
Scale indicators5 records
Recent moves6 records
Expansion highlights5 records
Main Iron Works competitors and assessment
Company assessmentRegional players
- Quality Marine Services: Gulf Coast marine vessel repair and refit yard serving towboats, push boats, and offshore vessels. Comparable to Main Iron Works' dry docking and dockside repair service line, with overlapping regional customers in the inland marine market.
Direct peers
- Silver Ships: Theodore, Alabama-based builder of aluminum workboats, patrol boats, and support craft; explicitly cited alongside Main Iron Works in Gulf Coast Tier II shipyard coverage. Comparable scale and Gulf Coast positioning, though tilted toward smaller aluminum craft.
- Steiner Shipyard: Gulf Coast (Bayou La Batre, Alabama) Tier II shipyard explicitly named in regional coverage as expanding alongside Main Iron Works. Builds fishing vessels, tugboats, and offshore support vessels for similar inland and Gulf marine customers.
- Conrad Shipyard: Louisiana-based shipbuilder of tugboats, towboats, and offshore vessels. Serves overlapping inland and offshore marine customers with similar vessel types and regulatory build requirements.
- Eastern Shipbuilding Group: Panama City, Florida shipbuilder constructing commercial vessels including tugs, ATBs, and offshore support vessels. Comparable Tier II Gulf Coast positioning and serves similar marine transportation customers.
- Master Boat Builders: Coden, Alabama-based shipbuilder constructing tugboats, push boats, and offshore vessels for Gulf Coast marine operators. Comparable size and scope, with overlapping customer relationships in the inland towing sector.
- Leevac Industries: Louisiana-based shipbuilder with tug, towboat, and barge construction capabilities serving Gulf Coast marine operators. Directly comparable in size, geography, and product mix to Main Iron Works.
- C&G Boatbuilders: Mobile, Alabama vessel builder constructing tugboats, crew boats, and offshore vessels. Comparable Tier II Gulf Coast shipyard with overlapping customer segments in marine transportation.
Broad incumbents
- Bollinger Shipyards: Large Louisiana-based shipyard group with coast-wide footprint building and repairing tugs, barges, and military vessels. Comparable vessel classes and Gulf Coast customer base to Main Iron Works, but at materially greater scale and with broader vessel portfolio.
- Birdon America: Denver/Portland shipbuilder named alongside Main Iron Works as a Gulf Coast Tier II yard expanding for military and commercial demand. Broader geographic and product scope but overlapping demand for military and commercial vessel capacity.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks6 records
Key highlights7 records
Customer concentration
Main Iron Works social profiles
Digital presenceMain Iron Works compliance and trust
Trust signalCompliance1 record
Main Iron Works financial estimates
Financial estimateRevenue estimate
Valuation estimate
Main Iron Works leadership team
Management profileNumber of profiles
Profiles1 record
Main Iron Works funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Main Iron Works M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Main Iron Works
What does Main Iron Works do?
Main Iron Works is a Houma, Louisiana-based Tier II shipyard that builds, refurbishes, and repairs commercial marine vessels for inland waterway and coastal operators. Core deliveries include custom new construction of tugboats (ASD tractor tugs, Z-drive, and conventional tugs), push boats, barges, and scallop boats, alongside full-service ship repair, dry docking, dockside repairs, and ABS-certified machine shop services for propeller shafts, rudders, steering components, and specialized pump/prop repair.
Is Main Iron Works a public or private company?
Main Iron Works is a private company. It is classified as family owned and is currently operating.
When was Main Iron Works founded?
Main Iron Works was founded in 1947. It employs 51 to 100 people.
Where is Main Iron Works based?
Main Iron Works is headquartered in Houma, United States, in the North America region.
How does Main Iron Works make money?
Three revenue lines are on record. New Vessel Construction is the primary driver. The others are ship Repair and Refurbishing and machine Shop Services.
Who are Main Iron Works's main competitors?
Quality Marine Services is listed as a regional player. Direct peers are Silver Ships, Steiner Shipyard, Conrad Shipyard, Eastern Shipbuilding Group, Master Boat Builders, Leevac Industries and C&G Boatbuilders. Broad incumbents are Bollinger Shipyards and Birdon America.
Does Main Iron Works have an API?
No public API is recorded for Main Iron Works.
What industry is Main Iron Works in?
Main Iron Works's product category is Shipbuilding & Marine Vessel Construction. Its primary akta.pro industry code is IMAJALAH, Steelwork & Fabrication Facilities (Plate/Section Processing, Welding Lines), with a secondary code of TLAKAKAF, Mechanical Systems Repair (Engines, Propulsion, Pumps). Its NAICS code is 336611 and its SIC code is 3730.