Samayu
Samayu Co., Ltd. is a Japanese marine after-sales service company founded in 1972, providing maintenance, repair, and overhaul of marine equipment — primarily Mitsubishi Heavy Industries products — to shipyards, shipping lines, and government fleets across Japan and Southeast Asia.
- Company typePrivate
- Founded1972
- HeadquartersShimonoseki, Japan
- Headcount51–100
- GTM typeB2B
- OfferingServices
What Samayu does
Samayu Co., Ltd. is a Japanese marine after-sales service company founded in 1972, providing maintenance, repair, and overhaul (MRO) of marine equipment with a primary specialization in Mitsubishi Heavy Industries (MHI) products. The company serves vessel operators, shipyards, and government fleets, with named customers including the Japan Coast Guard, MOL, NYK Line, K Line, and ENEOS Ocean. It operates from five locations — four in Japan plus a Singapore branch — and maintains a field engineering force of approximately 30 service engineers out of 82 total employees as of May 2026.
The company's revenue mix combines service contracts, spare parts distribution for MHI marine machinery, equipment overhauls, and sales of proprietary products. Its proprietary offerings include the SAMAYU ORFAS fuel oil filter/separator system, marketed since 1984, and the SVRDD product line introduced in 2016. Beyond MHI, Samayu has expanded its principal base through partnerships with South Korea's YOOWON and China's Jiangsu Masada, broadening the multi-OEM product portfolio available to its shipping and shipyard customers. The company operates a dedicated Ogimachi Distribution Center, renovated in May 2025, supporting its parts logistics and proprietary product output.
Samayu is privately held with a stated capital of JPY 50 million (~USD 330,000) and holds ISO 9001 quality certification and bizSAFE Level 2 certification in Singapore. No external funding, investor base, or financial performance figures have been disclosed. The company is a relatively opaque small-cap industrial services firm whose value proposition rests on long-tenure OEM relationships, accumulated technical expertise in MHI marine machinery, and a recurring service model tied to safety-critical marine equipment maintenance cycles.
Samayu firmographics
Firmographics- Name
- Samayu
- Legal name
- サマユー株式会社 (SAMAYU CO., LTD.)
- Website
- https://samayu.co.jp
- Company type
- Private
- Founded year
- 1972
- Operating status
- Operating
- Headcount range
- 51–100 employees
- Short description
- Samayu Co., Ltd. is a Japanese marine after-sales service company founded in 1972, providing maintenance, repair, and overhaul of marine equipment — primarily Mitsubishi Heavy Industries products — to shipyards, shipping lines, and government fleets across Japan and Southeast Asia.
- Ownership category
- akta.pro rank
Samayu industry classification
Industry- Product category
- Marine Machinery After-Sales Services
- NAICS
- Ship Building and Repairing (336611), Support Activities for Water Transportation (4883)
- SIC
- Ship & Boat Building & Repairing (3730)
- akta.pro primary industry
- Propulsion MRO, Spares & Field Service (Overhauls, retrofits, upgrades) (IMAJAHAN)
- akta.pro secondary industries
- Propulsion, Shafting & Rudder Repair (Engines, Gearboxes, Thrusters) (IMAJAFAC), Retrofits & Modernization (Scrubbers, Ballast Water, Alternative Fuels, Energy-Saving Devices) (IMAJAFAH), Marine MRO Parts & Consumables Distribution (TLAKAOAJ), Naval & Government Vessel Maintenance & Modernization (TLAKAKAB)
Keywords
Where Samayu is headquartered
LocationHeadquarters
- HQ city
- Shimonoseki
- HQ country
- Japan
- HQ region
- Asia
Offices6 records
Markets served
Samayu business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Infrastructure, Technology or R&D, Supply Chain, Marketing or Sales
Revenue model
- After-Sales Service: Technical after-sales service for Mitsubishi Heavy Industries marine machinery including installation, adjustment, repair, and regular maintenance. Services provided at shipyards, ports, and onboard vessels domestically and internationally.
- Spare Parts Supply: Authorized sales agent for Mitsubishi Heavy Industries marine spare parts and YOOWON INDUSTRIES LTD steering gear parts. Includes import/export of marine machinery parts from Shimonoseki headquarters.
- Product Manufacturing: Manufacturing of marine machinery components including deck machinery and hydraulic units for Mitsubishi Heavy Industries shipyards, particularly Nagasaki Shipyard. Also includes windmill and MET turbocharger parts.
Go-to-market motion1 record
Distribution channels3 records
Marketing channels3 records
Samayu product offering
Product offeringCore offering
Samayu provides after-sales service for Mitsubishi Heavy Industries marine machinery, including installation, adjustment, repair, and regular maintenance of hydraulic deck machinery, steering gear, fin stabilizers, water jet propulsion systems, and MET turbochargers for shipyards, shipping companies, and government maritime agencies. The company is an authorized spare parts distributor for Mitsubishi and YOOWON Industries steering gear, and manufactures proprietary products including the SAMAYU ORFAS working oil purifier and SVRDD deck crane monitoring system.
Product overview
Samayu operates as a marine machinery after-sales service company specializing in Mitsubishi Heavy Industries marine products. The core offering consists of three main divisions: (1) After-Sales Service Department providing installation, adjustment, repair, and maintenance for hydraulic machinery, deck cranes, steering gear, fin stabilizers, and turbochargers; (2) Spare Parts Supply Department serving as authorized dealer for Mitsubishi and YOOWON Industries components; and (3) Product Manufacturing Department producing deck machinery, hydraulic units, and custom equipment for shipyards. Key proprietary products include SAMAYU ORFAS oil purifiers and the SVRDD deck crane monitoring system. Services are delivered through domestic bases in Shimonoseki (HQ), Tokyo, Kobe, and Nagasaki, plus Singapore branch, with approximately 30 service engineers providing worldwide support.
Differentiator
Problem solved
Functional benefit
Products and services
- After-Sales Service for Mitsubishi Heavy Industries Marine Products
Quantifiable outcome
- Service network spans 4 domestic and 1 overseas base with ~30 service engineers
- +1 more outcomes
Companies that use Samayu
Customer profileNamed customers10 records
Segments4 records
Ideal customer profiles4 records
Samayu technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature4 records
Samayu partnerships and signals
Strategic signalPartnerships
Four partnerships are on record, tiered minor and core.
- Jiangsu Masada Heavy Industries Co., Ltd. (江蘇政田重工)minorAfter-sales service contract for deck machinery manufactured by Jiangsu Masada Heavy Industries, expanding service coverage to Chinese-manufactured equipment.
- YOOWON INDUSTRIES LTD. (South Korea)coreStrategic partnership for YOOWON-MITSUBISHI STEERING GEAR products and filtering elements. Company serves as authorized sales agent for spare parts of YOOWON steering gear, with sales contract established March 2003.
- Mitsubishi Heavy Industries, Ltd. (三菱重工業)corePrimary strategic partner providing after-sales service for Mitsubishi marine products including steering gear, fin stabilizers, deck machinery, water jet propulsion systems, and MET turbochargers. Established service contracts with various Mitsubishi shipyards and manufacturing facilities starting from 1973. Company serves as authorized service provider and parts distributor for Mitsubishi marine equipment.
- Japan Coast Guard (海上保安庁)coreMajor government customer requiring regular maintenance and authorized spare parts supply for maritime safety vessels across all regional coast guard stations in Japan.
Scale indicators5 records
Recent moves10 records
Expansion highlights5 records
Samayu competitors and assessment
Company assessmentBroad incumbents
- Wärtsilä: Global marine engine and service major with extensive lifecycle service network, comparable as a provider of MRO, spare parts, and field service to ship operators — though far broader in scope and OEM-agnostic versus Samayu's MHI-specialized model.
- Alfa Laval: Global supplier of marine equipment and services including heat exchangers, separators, and fluid handling — overlaps with Samayu's hydraulic and oil purification service offerings (including SAMAYU ORFAS).
- Hamworthy Marine (Wärtsilä): Marine systems and service business (now part of Wärtsilä) covering pumps, compressors, and HVAC — comparable in offering aftermarket service and spare parts for marine machinery systems.
- Kawasaki Heavy Industries (Marine): Japanese shipbuilder and marine machinery manufacturer with internal service organization for its own propulsion, steering, and deck machinery — a domestic Japanese peer with comparable product categories and government/shipyard customer base.
- ABB Marine & Ports: Provides marine service, automation, and electric propulsion solutions with global service network — comparable as a provider of marine aftermarket services and digital monitoring solutions for ship operators.
- IHI Corporation: Japanese heavy industrial manufacturer with marine propulsion and machinery divisions; comparable as a domestic Japanese peer in marine machinery manufacturing and after-sales service for shipyards and shipping operators.
- Mitsui E&S Holdings: Former Mitsui Engineering & Shipbuilding, operates shipyards and provides marine machinery after-sales service in Japan — a domestic peer serving similar shipyard and shipping customers with overlapping MRO capabilities.
Direct peers
- MAN Energy Solutions: Provides marine propulsion MRO, turbocharger service, and spares globally — directly comparable to Samayu's MET turbocharger rotor balancing and propulsion-system field service, although MAN is an OEM itself whereas Samayu serves as an authorized aftermarket agent.
- Caterpillar Marine: Global marine power and service business selling engines, parts, and maintenance contracts to commercial marine operators — directly comparable as a marine OEM with authorized dealer/service network model akin to Samayu's MHI relationship.
- Yanmar Marine: Marine engine OEM with global service network providing parts, maintenance, and field service for marine propulsion systems — directly comparable to Samayu's propulsion-focused MRO and authorized parts distribution model.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat3 records
Key risks6 records
Key highlights7 records
Customer concentration
Samayu social profiles
Digital presenceSamayu compliance and trust
Trust signalCompliance2 records
Samayu financial estimates
Financial estimateRevenue estimate
Valuation estimate
Samayu leadership team
Management profileNumber of profiles
Profiles4 records
Samayu funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Samayu 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 Samayu
What does Samayu do?
Samayu provides after-sales service for Mitsubishi Heavy Industries marine machinery, including installation, adjustment, repair, and regular maintenance of hydraulic deck machinery, steering gear, fin stabilizers, water jet propulsion systems, and MET turbochargers for shipyards, shipping companies, and government maritime agencies. The company is an authorized spare parts distributor for Mitsubishi and YOOWON Industries steering gear, and manufactures proprietary products including the SAMAYU ORFAS working oil purifier and SVRDD deck crane monitoring system.
Is Samayu a public or private company?
Samayu is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Samayu founded?
Samayu was founded in 1972. It employs 51 to 100 people.
Where is Samayu based?
Samayu is headquartered in Shimonoseki, Japan, in the Asia region.
How does Samayu make money?
Three revenue lines are on record. After-Sales Service is the primary driver. The others are spare Parts Supply and product Manufacturing.
Who are Samayu's main competitors?
Broad incumbents on record are Wärtsilä, Alfa Laval, Hamworthy Marine (Wärtsilä), Kawasaki Heavy Industries (Marine), ABB Marine & Ports, IHI Corporation and Mitsui E&S Holdings. Direct peers are MAN Energy Solutions, Caterpillar Marine and Yanmar Marine.
Does Samayu have an API?
No public API is recorded for Samayu.
What industry is Samayu in?
Samayu's product category is Marine Machinery After-Sales Services. Its primary akta.pro industry code is IMAJAHAN, Propulsion MRO, Spares & Field Service (Overhauls, retrofits, upgrades), with a secondary code of IMAJAFAC, Propulsion, Shafting & Rudder Repair (Engines, Gearboxes, Thrusters). Its NAICS code is 336611 and its SIC code is 3730.