Mitsui Engineering & Shipbuilding

Mitsui Engineering & Shipbuilding, now commonly branded Mitsui E&S, is a Japanese heavy-industries company whose historical identity was rooted in commercial and naval shipbuilding. Its business has since been substantially reorganized. Following the transfer of its naval and merchant shipbuilding operations, the company is primarily associated with high-value marine equipment and industrial systems, especially marine diesel engines, automated container-terminal cranes, and related engineering businesses. The company traces its origins to 1917, when Mitsui & Co. established a shipbuilding division and began developing a shipyard at Tamano. Early shipbuilding success helped Mitsui expand into marine propulsion equipment. In 1924, the company built Akagisan Maru, identified as the first Japanese-built diesel-propelled merchant ship. It subsequently began manufacturing diesel engines under a licensing arrangement with Danish engine maker Burmeister & Wain, establishing a technical connection that influenced the company's long-term marine-engine activities. The shipyards became a separate entity within the Mitsui zaibatsu in 1937 under the name Tama Shipyard, and the business adopted the name Mitsui Shipbuilding & Engineering Co., Ltd. in 1942. In the postwar period, it resumed export-oriented industrial production. In 1948, it built S.S. Knurr, a Norwegian whaling vessel described as the first ship built in Japan for export after the Second World War. The company also broadened beyond ships: in 1951 it entered chemical-plant engineering by constructing a nylon-production facility for Toray Industries. Mitsui's engineering capabilities became visible in several landmark projects. In 1961, it built Kinkasan Maru for Mitsui O.S.K. Lines. The vessel was designed with extensive automation, including control of the engine room from the bridge, and represented an early milestone in automated merchant-ship operation. As container shipping expanded, Mitsui entered the container-terminal equipment market and built its first gantry cranes in 1967. Its marine construction portfolio also included very large vessels, such as the 391.83-metre Berge Emperor, completed in 1975 and described at the time as the world's longest ship. The company strengthened its industrial-equipment base through international technology and business acquisitions. In 1990, it acquired Burmeister & Wain's engineering and construction business. That relationship later included a boiler business serving small and medium-sized biomass power plants. Mitsui E&S also developed a significant position in port equipment through PACECO Corp., its wholly owned United States subsidiary. PACECO is associated with the development of the first dedicated ship-to-shore container crane in 1958, while Mitsui E&S became a leading supplier of automated gantry cranes in Japan. Its cranes have been used at major ports including Long Beach, Los Angeles, Mombasa, Ho Chi Minh City, and Port Klang. A strategic restructuring in the 2020s marked the decisive separation from traditional shipbuilding. In 2021, Mitsui E&S divided its naval and merchant shipbuilding activities. Mitsubishi Heavy Industries acquired the naval shipbuilding business, including the Tamano Shipyard, while Tsuneishi Shipbuilding acquired a 49 percent stake in the merchant shipbuilding business. Tsuneishi subsequently took majority control in 2022 and full ownership of the shipbuilding division in 2025. Mitsui E&S therefore remains a company with shipbuilding heritage but is no longer principally a shipbuilder itself. The current strategic emphasis is on marine engines, port logistics equipment, and machinery with environmental applications. In 2022, Mitsui E&S agreed to acquire IHI's marine-engine business and announced development work on ammonia-fueled marine engines intended to reduce carbon dioxide emissions from shipping. The company operates works in Tamano, Ichikawa, and Oita, with offices in Japan and oversea…

Mitsui E&S originated in 1917 as the shipbuilding division of Mitsui & Co., with its first shipyard established at Tamano. Its early development combined vessel construction with marine-propulsion technology. In 1924, it built Akagisan Maru, regarded in the reference material as Japan's first diesel-propelled merchant ship built domestically. The company then began producing diesel engines under license from Burmeister & Wain of Denmark. The shipyards became a separate Mitsui zaibatsu entity in 1937 as Tama Shipyard. The corporate name changed to Mitsui Shipbuilding & Engineering Co., Ltd. in 1942. After the Second World War, the company resumed export activity and in 1948 built S.S. Knurr for Norway, described as the first postwar Japanese-built export ship. It diversified into plant engineering in 1951 by constructing a nylon-production plant for Toray Industries. Mitsui's history includes several notable engineering milestones. Kinkasan Maru, built in 1961 for Mitsui O.S.K. Lines, used extensive automation and allowed the engine room to be controlled from the bridge. In 1967, the company built its first gantry cranes for container ships, entering a business that later became central to its identity. In 1975, it completed the 391.83-metre Berge Emperor, then described as the world's longest ship. The company also built naval vessels, merchant ships, tankers, bulk carriers, support ships, and ocean liners. International expansion continued through the acquisition of Burmeister & Wain's engineering and construction business in 1990. The related boiler business later served small and medium biomass power plants. Mitsui E&S's port-equipment activities were also supported by PACECO Corp., a wholly owned subsidiary headquartered in Hayward, California. PACECO is credited with building the first dedicated ship-to-shore container crane in 1958. Mitsui E&S became a major supplier of automated gantry cranes in Japan, with equipment installed at ports in North America, Africa, Southeast Asia, and elsewhere. The company reorganized its shipbuilding activities in 2021. Mitsubishi Heavy Industries acquired the naval shipbuilding business, including the Tamano Shipyard, while Tsuneishi Shipbuilding acquired a 49 percent stake in the merchant shipbuilding operation. Tsuneishi gained majority control in 2022 and full ownership of the shipbuilding division in 2025. These transactions changed Mitsui E&S from an integrated shipbuilder into a more specialized industrial and marine-equipment company. In the 2020s, Mitsui E&S emphasized marine engines, port cranes, and machinery. Its agreement to acquire IHI's marine-engine business in 2022 expanded its propulsion activities, while ammonia-fuel development addressed the maritime sector's effort to reduce emissions. The company also retained a strong position in port logistics through automated gantry and ship-to-shore cranes. Its facilities include works in Tamano, Ichikawa, and Oita, supported by offices in Japan and overseas. The modern Mitsui E&S brand therefore represents both a long shipbuilding legacy and a strategic concentration on specialized equipment and engineering systems.

1. 2025Shipbuilding division fully transferred to Tsuneishi

   Tsuneishi Shipbuilding took full ownership of Mitsui E&S's shipbuilding division.

   Source
2. 2022IHI marine-engine business transaction announced

   Mitsui E&S agreed to purchase IHI's marine-engine business and announced ammonia-fueled engine development.

   Source
3. 2021Shipbuilding businesses reorganized

   The naval and merchant shipbuilding activities were separated and transferred through transactions involving Mitsubishi Heavy Industries and Tsuneishi Shipbuilding.

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4. 1990Burmeister & Wain engineering business acquired

   Mitsui E&S acquired Burmeister & Wain's engineering and construction business, deepening its marine-engine and industrial-equipment capabilities.

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5. 1975Berge Emperor completed

   The company completed Berge Emperor, a 391.83-metre vessel described at the time as the world's longest ship.

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6. 1967First container gantry cranes

   Mitsui built its first gantry cranes for container ships as containerized shipping began to expand.

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7. 1961Automated merchant ship delivered

   Mitsui built Kinkasan Maru for Mitsui O.S.K. Lines, an early large-scale vessel with extensive bridge-based automation.

   Source
8. 1951Entry into chemical-plant engineering

   The company built a nylon-production plant for Toray Industries and expanded beyond shipbuilding.

   Source
9. 1948First postwar Japanese export ship

   Mitsui built S.S. Knurr, a Norwegian whaling ship described as the first Japanese-built ship exported after the Second World War.

   Source
10. 1942Corporate name changed

    The business adopted the name Mitsui Shipbuilding & Engineering Co., Ltd.

    Source
11. 1937Tama Shipyard becomes a separate entity

    The shipyards were separated into an entity within the Mitsui zaibatsu under the name Tama Shipyard.

    Source
12. 1924Akagisan Maru completed

    The company built Akagisan Maru, identified as the first Japanese-built diesel-propelled merchant ship.

    Source
13. 1917Shipbuilding division established

    Mitsui & Co. established the shipbuilding division that became the foundation of Mitsui E&S and began developing a shipyard at Tamano.

    Source

A Japanese maritime and heavy-engineering specialist transitioning from integrated shipbuilding toward marine propulsion, port automation, cargo-handling equipment, and lower-emission industrial technologies.

• Marine enginesMarine propulsion

  Marine engines are one of Mitsui E&S's principal current businesses. The company's propulsion history began with licensed Burmeister & Wain diesel technology and continued through later marine-engine operations and the planned acquisition of IHI's marine-engine business. Mitsui E&S has also worked on ammonia-fueled marine engines, linking its propulsion portfolio to shipping-sector efforts to reduce carbon dioxide emissions.

• Automated gantry cranesPort equipment1967

  Mitsui E&S manufactures automated gantry cranes used in container terminals. The company entered the market in 1967, when it built its first gantry cranes for container ships. Its equipment is used at major ports in Japan and internationally, supporting container movement and terminal automation.

• PACECO ship-to-shore cranesPort equipment1958

  PACECO Corp., a wholly owned Mitsui E&S subsidiary based in Hayward, California, is associated with the development of the first dedicated ship-to-shore container crane in 1958. The PACECO business forms part of Mitsui E&S's international port-equipment platform and has been linked to plans for renewed crane manufacturing in the United States.

• Industrial and biomass boilersEnergy equipment

  The company's connection to Burmeister & Wain's engineering businesses includes boiler technology serving small and medium biomass power plants. This activity reflects Mitsui E&S's broader industrial-engineering portfolio beyond marine equipment.

• ShipbuildingShipbuilding1917

  Shipbuilding was historically Mitsui E&S's defining activity, covering merchant ships, naval vessels, tankers, bulk carriers, support ships, and ocean liners. The business produced notable vessels including Akagisan Maru, Kinkasan Maru, and Berge Emperor. Naval and merchant shipbuilding were transferred through restructuring transactions, and Tsuneishi Shipbuilding took full ownership of the shipbuilding division in 2025.

• 2025Complete transfer of shipbuilding divisionM&A

  The earlier restructuring had already transferred operational control of Mitsui E&S's merchant shipbuilding business to Tsuneishi Shipbuilding.

  What changed. Tsuneishi Shipbuilding took full ownership of the Mitsui E&S shipbuilding division.

  Aftermath. Mitsui E&S's corporate identity became centered on marine engines, port cranes, and other industrial machinery rather than complete-vessel construction.

  Source
• 2024Plan renewed U.S. port-crane manufacturingStrategy

  The United States announced a proposed program to improve and secure national port infrastructure.

  What changed. Mitsui E&S and PACECO planned to resume manufacturing port cranes in the United States.

  Aftermath. The plan reinforced Mitsui E&S's role in port logistics equipment and its continuing relationship with the U.S. market.

  Source
• 2022Acquire IHI marine-engine businessM&A

  After reducing its direct shipbuilding exposure, Mitsui E&S sought to strengthen the marine-propulsion business that remained central to its strategy.

  What changed. Mitsui E&S agreed to purchase IHI's marine-engine business.

  Aftermath. The transaction supported Mitsui E&S's concentration on marine engines and related technologies, including lower-emission propulsion research.

  Source
• 2022Develop ammonia-fueled marine enginesProduct launch

  Shipping companies and equipment suppliers were investigating fuels that could reduce greenhouse-gas emissions from maritime transport.

  What changed. Mitsui E&S announced that it was developing ammonia-fueled marine-engine technologies.

  Aftermath. The initiative positioned the company's engine business within the maritime industry's transition toward lower-carbon propulsion.

  Source
• 2021Separate naval and merchant shipbuildingStrategy

  Mitsui E&S was repositioning itself away from an integrated shipbuilding model and toward marine engines, port cranes, and specialized machinery.

  What changed. The naval shipbuilding business, including the Tamano Shipyard, was sold to Mitsubishi Heavy Industries, while Tsuneishi Shipbuilding acquired an initial 49 percent stake in the merchant shipbuilding business.

  Aftermath. Tsuneishi later obtained majority control in 2022 and full ownership of the shipbuilding division in 2025, leaving Mitsui E&S focused primarily on equipment and engineering.

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• 2025Tsuneishi Shipbuilding takes full ownership of Mitsui E&S shipbuilding division

  Tsuneishi Shipbuilding completed the move to full ownership of Mitsui E&S's shipbuilding division, confirming Mitsui E&S's strategic focus on engines, port cranes, and other machinery.

  M&A
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• 2025Mitsui E&S shipbuilding division fully transferred to Tsuneishi Shipbuilding

  Tsuneishi Shipbuilding took full ownership of the relevant Mitsui Engineering & Shipbuilding shipbuilding division, completing a major phase of Mitsui E&S's restructuring.

  M&A
  Source
• 2024PACECO and Mitsui E&S plan renewed U.S. crane manufacturing

  The White House announced that Mitsui E&S and its PACECO subsidiary planned to resume manufacturing port cranes in the United States within a proposed program to upgrade and secure U.S. port infrastructure.

  Other
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• 2024Mitsui E&S and PACECO plan renewed US port-crane manufacturing

  The White House announced that Mitsui E&S and its subsidiary PACECO planned to resume manufacturing port cranes in the United States as part of a broader US program to upgrade and secure port infrastructure.

  Other
  Source
• 2022Mitsui E&S agrees to acquire IHI marine-engine business

  The company agreed to purchase IHI's marine-engine business as part of its effort to strengthen its marine-propulsion activities.

  M&A
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• 2022Mitsui E&S advances ammonia-fueled marine-engine development

  Mitsui E&S announced development work on ammonia-fueled marine engines as a possible route to reducing carbon dioxide emissions from shipping.

  Product launchOther
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• 2022Mitsui E&S agrees to acquire IHI's marine-engine business

  Mitsui E&S agreed to purchase IHI's marine-engine business, supporting its strategic concentration on marine propulsion and related equipment.

  M&A
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• 2022Tsuneishi Shipbuilding takes majority control of Mitsui's merchant shipbuilding business

  Tsuneishi Shipbuilding took over a majority stake in Mitsui E&S's merchant shipbuilding business as Mitsui E&S continued its shift toward marine engines, port cranes, and machinery.

  M&A
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• 2021Mitsui E&S transfers naval and merchant shipbuilding activities

  Mitsui E&S separated its naval and merchant shipbuilding businesses, with Mitsubishi Heavy Industries taking the naval operation and Tsuneishi Shipbuilding acquiring an initial minority stake in the merchant operation.

  M&A
  Source

1. Mitsui E&S
2. Mitsui E&S official website