What JMU Amtec Co. does

JMU Amtec Co., Ltd. (株式会社JMUアムテック) is a Japanese shipbuilder and maritime steel structure fabricator headquartered in Aioi City, Hyogo Prefecture. The company constructs and repairs small vessels, workboats, caisson production floating docks, non-self-propelled barges, marine crane vessels, and specialized government ships such as marine environmental maintenance vessels. It operates three dry docks — including the No.3 Repair Dock measuring 340.0m x 56.0m with four cranes — plus marine platforms and outfitting yards that support both new construction and large-vessel repair. Founded in 1907 as Harima Shipyard, the current entity was formed in 1990 as IHI AMTEC and was reorganized under Japan Marine United (JMU) in January 2013, inheriting more than a century of shipbuilding heritage.

The company's product portfolio spans four main streams: (1) new ship construction (cargo ships, work platforms, floating docks, special ships for government and private marine operators); (2) ship repair and refurbishment including accident recovery and special modification work; (3) fabrication of living quarters modules and hull blocks (bow/stern sections) delivered to other shipyards nationwide; and (4) steel structures including floating piers, breakwaters, and intake structures for power plants. JMU Amtec uses modern CAD systems and 3D scanning reverse engineering for fabrication, and participates in the seven-company MILES consortium (with Mitsubishi Shipbuilding, Imabari Shipbuilding, K LINE, MOL, NYK Line, and NSY) to develop standard design frameworks for LCO2 carriers and alternative-fuel ships, as well as in a 10-organization consortium building an Integrated Simulation Platform for digitalized ship design and construction.

JMU Amtec generates revenue through project-based contracts with two primary customer segments: Japanese government maritime agencies (e.g., Ministry of Land, Infrastructure, Transport and Tourism regional bureaus) and private maritime/construction companies (e.g., Nitto Tag, Fukada Salvage Construction, Takeyama Construction, Aomi Construction, Ipponmatsu Logistics). Pricing is quoted per project based on vessel specifications, scale, and complexity and is not publicly disclosed. Sales are conducted directly through the company's Sales Department. The company is a privately held subsidiary of JMU (Japan Marine United), employs an estimated 300-400 people, and hosts the Aioi Technical Training Center — one of six nationwide shipbuilding skill training centers — supporting workforce development for the broader Japanese shipbuilding industry.

Name

JMU Amtec Co.

Legal name

株式会社JMUアムテック

Website

https://jmu-amtec.co.jp

Company type

Private

Founded year

1907

Operating status

Operating

Headcount range

251–500 employees

Short description

JMU Amtec Co., Ltd. is a Japanese shipbuilder in Aioi, Hyogo Prefecture that constructs and repairs small vessels, workboats, floating docks, and coastal steel structures for government maritime agencies and private marine construction clients across Japan.

Ownership category

akta.pro rank

Product category

Shipbuilding and Maritime Construction

NAICS

Ship Building and Repairing (336611), Ship and Boat Building (3366)

SIC

Ship & Boat Building & Repairing (3730)

akta.pro primary industry

Landing Craft & Amphibious Workboats (LCM/LCT-style, Beaching Craft) (IMAJADAK)

akta.pro secondary industries

Engine & Mechanical Overhaul (Main/Aux Engines, Pumps, Valves, Compressors) (TLAHAMAD), Fabrication & Prefab Modules for Repair (Spools, Steel/Aluminum Sections) (IMAJAFAL), Piping, HVAC & Auxiliary Systems Repair (TLAKAKAH)

Keywords

• Small vessel construction
• Workboat shipbuilding
• Ship repair services
• Hull block fabrication
• Floating steel structures

Headquarters

HQ city

Aioi

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Infrastructure, Operations, Technology or R&D, Supply Chain, Marketing or Sales

Revenue model

1. New ship construction: JMU Amtec builds new small craft and work vessels including cargo ships, marine crane ships, various public-works platform vessels, ocean environment maintenance ships, floating docks, and special ships. Revenue is project-based, generated upon delivery of completed vessels.
2. Ship repair and refurbishment: The company conducts interim inspections, scheduled inspections, accident-at-sea repairs, and special refurbishment work on vessels. Revenue is generated through service contracts and per-project repair engagements.
3. Living quarters and hull block fabrication: JMU Amtec fabricates ship living quarters (accommodation modules) and hull blocks (bow, stern sections) for delivery to other shipyards domestically and internationally. Revenue is generated through fabrication contracts.
4. Steel structures and can manufacturing: Production of floating piers, floating breakwaters, and various floating structures, as well as land-based steel structures for maritime and port infrastructure applications.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels5 records

Core offering

JMU Amtec constructs new small vessels and workboats (cargo ships, marine crane vessels, public-works platform vessels, ocean environment maintenance ships, floating docks, and special ships), performs ship repair and refurbishment services (inspections, accident-at-sea repairs, special modifications), fabricates ship living quarters modules and hull blocks (bow and stern sections) for delivery to other shipyards domestically and internationally, and produces floating and land-based steel structures.

Product overview

JMU Amtec Co. is a shipbuilding and maritime steel structure company offering a comprehensive portfolio of vessels, vessel components, and related services. The product portfolio includes: (1) New ship construction (cargo ships, marine crane vessels, work platforms, ocean environmental vessels, floating docks, special ships), (2) Ship repair services (inspections, accident repairs, modifications), (3) Living quarters modules and hull blocks (bow and stern sections) for delivery to shipyards nationwide, and (4) Steel structures including floating piers and breakwaters. The company operates the Aioi Technical Training Center for workforce development. Recent notable vessels include the 33.5m marine environmental cleanup vessel 'Mizuki', the 850-ton crane vessel 'Kirishima', and various floating docks for caisson production.

Differentiator

Problem solved

Functional benefit

Products and services

• New Ship Construction Construction of new small vessels and workboats for government and private clients, including cargo ships, marine crane vessels, ocean environment maintenance ships, floating docks, and special ships.
• Ship Repair and Refurbishment Services Intermediate inspections, scheduled inspections, accident-at-sea repairs, and special modification work on ships and work vessels using three dry docks at the Aioi shipyard.
• Living Quarters Module Fabrication Fabrication and outfitting of crew/worker living space modules including hull outfitting, furniture, and fixtures for ships, delivered to shipyards across Japan and internationally (including Brazil).
• Hull Block Fabrication Fabrication of bow (bulbous bow/bulb) and stern (sternframe/propeller section) hull blocks for ship construction, requiring advanced welding and forming techniques due to complex curved shapes.
• Steel Structures and Can Manufacturing Production of floating piers, floating breakwaters, intake structures for power plants, bio-storage silos, and various land-based steel structures for maritime and port infrastructure applications.
• Marine Environmental Cleanup Vessel 'Mizuki' Steel twin-hull marine cleaning and oil recovery vessel, 33.5m length, 197 gross tons, for coastal sea surface cleaning and floating debris/oil collection operations; delivered to government maritime agency.
• 850-ton Non-Propelled Tilting Crane Vessel 'Kirishima' Non-self-propelled crane vessel capable of lifting cargo up to 850 tonnes, converted from a transport barge by adding a jib crane, living quarters, and winch room, equipped with thrusters and spuds for enhanced maneuverability; for marine construction and salvage operations.
• 8,000-ton Caisson Production Work Barge (AFD-8000) Non-propelled floating dock for caisson production, capable of producing 8,000-ton class caissons, used for breakwater and quay wall construction.
• 3,000-ton Non-Propelled Box Barges (Nitto Tag newbuilds) Two 3,000-tonne class non-self-propelled box barges for cargo transport, contracted for Nitto Tag Co., Ltd. with delivery scheduled for March and April 2028.
• 11,000-ton Floating Dock (Caisson Dock) 11,000-ton capacity caisson production floating dock for building concrete/steel caissons used in breakwaters and quay walls; contracted for Takeyama Construction.

Quantifiable outcome

• Delivered 7th marine environmental maintenance vessel to government client, demonstrating sustained quality and repeat business
• +1 more outcomes

Named customers6 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Twelve partnerships are on record, tiered core and minor.

• MILES Co., Ltd.coreTechnology or Integration · 16 April 2026JMU is one of seven Japanese companies (including Mitsubishi Shipbuilding, Imabari Shipbuilding, K LINE, MOL, NYK Line, JMU, and NSY) that signed a memorandum of understanding to establish a standard design framework for liquefied CO2 (LCO2) carriers and next-generation alternative-fuel ships using the MILES digital platform. MILES Co., Ltd. serves as the platform company responsible for developing and executing initial ship designs which other domestic shipyards can then use for functional and production design.
• Mitsubishi ShipbuildingcoreStrategic or Co-development Partner · 16 April 2026Part of seven-company consortium to establish standard design framework for LCO2 carriers and alternative-fuel ships, and part of 10-organization consortium developing Integrated Simulation Platform to digitize ship design and construction. Japan aims to double shipbuilding capacity by 2035 and become the world's leading sustainable shipbuilder.
• Imabari ShipbuildingcoreStrategic or Co-development Partner · 16 April 2026Part of seven-company consortium (with Mitsubishi Shipbuilding, K LINE, MOL, NYK Line, JMU, and NSY) to establish standard design framework for LCO2 carriers and alternative-fuel ships. Also part of 10-organization consortium developing Integrated Simulation Platform for digitalized ship design and construction.
• K LINE (Kawasaki Kisen Kaisha, Ltd.)coreStrategic or Co-development Partner · 16 April 2026As one of seven consortium members (including Mitsubishi Shipbuilding, Imabari Shipbuilding, MOL, NYK Line, JMU, and NSY), K LINE participates in establishing standard ship design frameworks for LCO2 carriers and alternative-fuel vessels using the MILES digital platform. Also participates in 10-organization consortium developing Integrated Simulation Platform.
• MOL (Mitsui O.S.K. Lines)coreStrategic or Co-development Partner · 16 April 2026As one of seven consortium members (including Mitsubishi Shipbuilding, Imabari Shipbuilding, K LINE, NYK Line, JMU, and NSY), MOL participates in establishing standard ship design frameworks for LCO2 carriers and alternative-fuel vessels using the MILES digital platform. Also participates in 10-organization consortium developing Integrated Simulation Platform.
• NYK Line (Nippon Yusen Kaisha)coreStrategic or Co-development Partner · 16 April 2026As one of seven consortium members (including Mitsubishi Shipbuilding, Imabari Shipbuilding, K LINE, MOL, JMU, and NSY), NYK Line participates in establishing standard ship design frameworks for LCO2 carriers and alternative-fuel vessels using the MILES digital platform. Also participates in 10-organization consortium developing Integrated Simulation Platform.
• NSY (Nihon Shipyard)coreStrategic or Co-development Partner · 16 April 2026As one of seven consortium members (including Mitsubishi Shipbuilding, Imabari Shipbuilding, K LINE, MOL, NYK Line, and JMU), NSY participates in establishing standard ship design frameworks for LCO2 carriers and alternative-fuel vessels using the MILES digital platform. Also participates in 10-organization consortium developing Integrated Simulation Platform.
• Tadano Infrastructure Solutions (タダノインフラソリューションズ)minorStrategic or Co-development PartnerTadano Infrastructure Solutions is the crane manufacturer for the 850-tonne lifting crane vessel being built by JMU Amtec for Fukada Salvage Construction. Attended the naming ceremony and crane construction is handled by Tadano.
• Fuji Maritime Industries Co., Ltd. (富士海事工業株式会社)minorChannel Partner/ Reseller/ DistributorFuji Maritime Industries orders caisson production work vessels from JMU Amtec on behalf of end clients (e.g., Aomi Construction), acting as an intermediary in the procurement chain.
• Ministry of Land, Infrastructure, Transport and Tourism (国土交通省)coreStrategic or Co-development PartnerSupports the Aioi Technical Training Center (相生技能研修センター) along with the Nippon Foundation (日本財団) and Japan Shipbuilding Association (一財) as one of six nationwide shipbuilding technical training centers. JMU Amtec provides technical training expertise through this center.
• Nippon Foundation (日本財団)coreStrategic or Co-development PartnerCo-supports the Aioi Technical Training Center (one of six nationwide shipbuilding training centers) together with the Ministry of Land, Infrastructure, Transport and Tourism and Japan Shipbuilding Association.
• Japan Shipbuilding Association (一財) (一般財団法人がjaxa/日本造船工業会)coreStrategic or Co-development PartnerCo-supports the Aioi Technical Training Center (one of six nationwide shipbuilding training centers) together with the Ministry of Land, Infrastructure, Transport and Tourism and Nippon Foundation.

Scale indicators5 records

Recent moves7 records

Expansion highlights4 records

Direct peers

• Niigata Shipbuilding & Repair Co., Ltd. Japanese shipbuilder and repairer serving coastal and small commercial vessel segments. Comparable to JMU Amtec in its combination of newbuild and repair services and its Japan-domestic customer focus.
• Sasaki Shipbuilding Co., Ltd. Japanese workboat builder specializing in fishing vessels, coast guard patrol boats, and small commercial craft. Similar to JMU Amtec in its focus on small craft and workboats for Japanese government and private maritime operators.
• Kanagawa Dockyard Co., Ltd. Japanese mid-size shipbuilder focused on small to medium vessels, workboats, and ship repair with multiple dry docks. Directly comparable to JMU Amtec in scale, product mix (small craft/workboats), and domestic Japanese customer base.
• Hashihama Shipbuilding Co., Ltd. Japanese small-craft and workboat builder operating from the Seto Inland Sea region. Comparable in scale and product focus (small vessels, workboats) to JMU Amtec's newbuild business.

Broad incumbents

• Oshima Shipbuilding Co., Ltd. Large Japanese bulk carrier builder with overseas operations. Comparable as a Japanese shipbuilding incumbent but operates at much greater scale and focuses on large commercial vessels rather than JMU Amtec's workboat niche.
• Mitsui E&S Shipbuilding Co., Ltd. Major Japanese shipbuilder (formerly part of Mitsui) building large commercial vessels including LNG carriers. Related to JMU Amtec through Japan's shipbuilding industry consolidation history and similar institutional heritage, but at significantly larger scale.
• Tsuneishi Shipbuilding Co., Ltd. One of Japan's largest shipbuilders with global operations, building large bulk carriers and container ships. Operates in the same Japanese shipbuilding industry as JMU Amtec but at significantly larger scale and with different vessel focus.
• Damen Shipyards Group: Global Dutch shipbuilder with extensive workboat, tug, patrol vessel, and offshore vessel portfolio. Comparable to JMU Amtec in its focus on workboats and small-to-medium specialized vessels, though operating globally and at much larger scale.

Regional players

• Eastern Shipbuilding Group: US-based shipbuilder specializing in offshore support vessels, patrol boats, and specialized commercial craft. Comparable to JMU Amtec in its focus on workboats and specialized vessels, though primarily serving the US Gulf maritime market.

Emerging players

• Strategic Marine Co. Singapore/Australia-based shipbuilder focused on aluminum fast ferries, workboats, and specialized vessels. Comparable to JMU Amtec in workboat and specialized vessel focus, though oriented toward Asia-Pacific commercial marine operators.

Market position

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

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 JMU Amtec Co.