THE GROUP

Welcome to ONEX Group

A Greek industrial group active in shipbuilding, ship repair, defense support, technology, and critical infrastructure.

BUSINESS SECTORS

Redefining the Greek industrial & maritime landscape

Through an integrated industrial ecosystem, ONEX Group combines engineering, technology, and operational expertise to support large-scale industrial development and the modernization of Greece’s maritime and industrial capabilities.

PROJECTS

Explore some of ONEX Group's most recent projects

From Shipbuilding, ship repair, desfense and naval projects to advanced industrial and infrastructure initiatives, the Group’s projects reflect a long-term vision focused on innovation, operational excellence, and the modernization of Greece’s industrial and maritime ecosystem.

NEWS & MEDIA

Stay up to date with the latest developments across ONEX Group

Explore company news, industry insights, strategic partnerships, and announcements that highlight our ongoing contribution to shipbuilding, technology, infrastructure, energy, and industrial innovation.

CAREERS

Join a leading Greek industrial and technology group

A career at ONEX Group means becoming part of a growing industrial and technology ecosystem with long-term opportunities across multiple sectors.

CONTACT

Get in touch with ONEX Group

Contact us and connect with the people shaping the future of industry, technology, and maritime innovation.

Shipbuilding & Ship Repair
BUSINESS SECTOR

Shipbuilding & Ship Repair

ONEX Shipyards & Technologies Group is a dynamic Greek industrial group active in shipbuilding, ship repair, defense support, technology, and critical infrastructure. By revitalizing the Syros and Elefsis shipyards, ONEX restores strategic industrial capacity at a key crossroads of the Eastern Mediterranean.

Shipyards Services

Major Conversions

In the conversions field Onex Shipyards and Technologies is specialized in large conversions, ship upgrades & ship modifications and can successfully overcome complex projects. Our Group enjoys an excellent reputation for carrying out highly sophisticated conversions and various challenging projects.

Ship-Repair & Shipping Energy transition

Ship repairs have always been a major activity at Onex Elefsis and Onex Neorion Shipyards. Ideally situated withing the Aegean region and perfectly positioned near the crossroads of numerous international shipping lanes and the Trans Mediterranean routes, such as the Mediterranean–Black Sea route, a few ours form the Suez–Gibraltar route and only five hours steaming from the main sea lane to the Adriatic. This Area has a long tradition in the commercial ship repair industry. An extensive infrastructure has been developed over the years, allowing the Superintendant and the Shipyards easy and prompt access to spare part suppliers, specialists, freight forwarders and to the various services provided by Sub- contractors.

Onex Shipyards is a high-tech shipbuilding, repairing and upgrading company. Our shipyards in Elefsis, Attika Region, Greece and in Neorion, Syros Island, Greece provides its customers 360o degrees integrated solutions covering ship design, construction and support tailored to their specialized needs while at the same time providing a complete set of support, maintenance services, for ballast water treatment, scrubbers, retrofitting, Caron capture etc., demonstrating supreme innovation and operational excellence.

ΟΝΕΧ Shipyards, is an ideal location for a one stop shop concept, with great reputation in value for money regarding time, quality and price, that provides turn key high tech solutions/services in design with, manufacture and life cycle support and introduces new innovative services that ensure total customer care and adjustment to the challenges of the new era.

ONEX's power in numbers

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Currently owning and managing assets

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investment plan globally

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dynamic workforce directly and inderictly

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successful repairs completed since 2019

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euro in completed and delivered projects

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years of maritime heritage

Main Capabilities

Maintain & repair

300+ ships annually (200/Elefsis, 100/Syros)

Retrofits of vessels

Retrofits to green & smart technologies BB, Shaft Generators, Scrubbers, Carbon Capture, etc

SPMT’s

Self-Propelled Modular Transporter available for handling up to 3.500 T

Shipbuilding Berth

A 200m x 55m building berth for constructing ships up to 100,000 DWT. Fully serviced by 400 T capacity Gantry crane.

New Designs & New Buildings

-20 + 20 RAstar 2800 under construction, out of 20 Tugboats
-Shipbuilding Program
-State-of-the-Art Ferries
-Offshore Support Vessels
-Pax / Ro-Ro Vessels
-Defense Vessels
-Mega Yachts

Core Differentiators

1. Best of Both Worlds

Combining top-tier European quality standards with Eastern Mediterranean cost-efficiency to maximize client value.

2. Strategic Stability

Modern infrastructure supported by strong government backing and international strategic partnerships.

3. Proven Excellence

An established track record with over 900 vessels serviced, demonstrating reliability and operational capacity.

4. Innovation & Robotics

Sustainability-focused modernization utilizing robotics and advanced technologies for efficiency and eco-compliance.

5. Skilled Workforce

Continuous investment in human capital through next-generation industrial training programs & technical schools.

6. Limitless Ambition

Driven by the vision to be the leading European industrial player; a shipyard network “Second to None.”

Greek Ship Repair Industry for 2024

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Landmark Achievements

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The ONEX Shipyards

ONEX Elefsis Shipyard

Located near Athens, Greece’s second-largest shipyard is undergoing an expansive rehabilitation. Once complete, Elefsis is projected to create capacity to repair and upgrade up to 200 ships per annum.

A Shipyard with a strategic location in the Mediterranean

Onex Elefsis is located in Elefsis bay approximately 10 Nautical miles from the anchorages of Piraeus. ONEX operates at the intersection of advanced shipbuilding, sustainable industrial solutions, and defense support. By revitalizing critical shipyard infrastructure and integrating modern green technologies, the Group delivers high-performance maritime and defense capabilities sustainable industrial solutions, and defense support. By revitalizing critical shipyard infrastructure and integrating modern green technologies

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Floating docks

Onex Elefsis Shipyard operates three (3) conventional floating docks fitted with adjustable side blocks, fresh water/sea water, compressed air, liquid propane, steam, AC/DC power supplies and phone connections. Currently our floating dock No.2 (75.000 DWT) is already in operation and can serve any type of vessel, while the other two floating docks are under extensive upgrade program, with expectation, by March 2024 Floating dock 3 (120.000 DWT) to be restating its operation.


Berths

Quays and Wharfs for Ship repairs are available, having length of over 1.500m, serviced by Cranes of lifting capacity up to 40 tons and they have extended supply networks for the general services and facilities that allow undertaking satisfactorily all requirements of ship repairs, for ships up to 500.000 DWT. The maximum allowable ship’s draught for repairs afloat is 9,5m. Additional lifting capacity is available from the shipyard’s 25 tons floating crane. Depending on the size of the ships, the yard can accommodate simultaneously 9 to 11 ships.


Trade Shops

Over 35.000 m2 of Workshops and storage facilities are available, serviced by overhead traveling cranes of lifting capacity up to 30 tons.

Fitter’s, Pipe and Castings Workshop, fully equipped for all types of mechanical repairs, replacement and rebuild for Propeller Shafts, Rudder Systems, pumps, main engines and all types of Diesel Engines

Boiler and steel metal Plate Shop: Equipped with modern machines for cutting, welding and forming steel and alloy metal plates.

Electrical shop has the necessary equipment in order to undertake the repairs of all types of Electrical motors, generators, and relevant equipment, such as Drying and paint chamber, Re-winding machines, Heat Drying equipment.

Woodworking shop, fully equipped for the replacement of bearings of the propeller shafts and Rudders, as well as Woodwork for Cabins, Decks, refrigerators, lifeboats and other.

A great number of portable tools and equipment are available for works aboard the ship or for the prefabrication and assembly sectors.


Cranes and the Load Transportation

  • Pier cranes of 1 x 20, 3 x 25 & 1 x 40 tons.

  • Land mobile cranes up to 90 tons

  • Travelling jib cranes

  • Forklifts

  • Cherry pickers

  • Moving platforms





ONEX Syros Shipyard

Serving as the ONEX shipyard platform in the Aegean, Syros is a foundational part of the revitalized dual-yard network, reliably supporting ship repair, upgrading, and maritime responsiveness across the Eastern Mediterranean.

A Shipyard with a strategic location in the Mediterranean

Onex Elefsis is located in Elefsis bay approximately 10 Nautical miles from the anchorages of Piraeus. ONEX operates at the intersection of advanced shipbuilding, sustainable industrial solutions, and defense support. By revitalizing critical shipyard infrastructure and integrating modern green technologies, the Group delivers high-performance maritime and defense capabilities sustainable industrial solutions, and defense support. By revitalizing critical shipyard infrastructure and integrating modern green technologies



ONEX Syros Shipyards - One of the oldest Greek heavy industries

ONEX operates at the intersection of advanced shipbuilding, sustainable industrial solutions, and defense support. By revitalizing critical shipyard infrastructure and integrating modern green technologies, the Group delivers high-performance maritime and defense capabilities sustainable industrial solutions, and defense support. By revitalizing critical shipyard infrastructure and integrating modern green technologies



Graph 1

Floating docks

In Neorion there are two (2) floating dry docks, with adjustable side blocks, compressed air, liquid propane, AC/DC power supplies and phone connection are included.


Berths

Quays and Wharfs for Ship repairs are available, having length of over 1.500m, serviced by Cranes of lifting capacity up to 40 tons and they have extended supply networks for the general services and facilities that allow undertaking satisfactorily all requirements of ship repairs, for ships up to 500.000 DWT. The maximum allowable ship’s draught for repairs afloat is 9,5m. Additional lifting capacity is available from the shipyard’s 25 tons floating crane. Depending on the size of the ships, the yard can accommodate simultaneously 9 to 11 ships.


Synchro–Lift

Onex Neorion is equipped with synchro lift of 2,500 tons capacity and serves ships up to 100m long. It is one of the largest in the Eastern Mediterranean and it was installed especially for the yacht market.


Trade Shops

The Machine shop caries our all kinds of marine repairs, replacements and reconditioning works, under totally controlled conditions. variety of boring, milling machines and lathes cover the full marine applications including repairs and machining operations to heavy gear such as rudders, tail shafts, thrusters.

The adjacent Electrical shop is capable of undertaking repairs of all types of electric motors, generators and associated equipment.

The plate and Pipe workshops have CNC cutting and shaping machines that ensure the rapid prefabrication and assembly of steel on other non-ferrous metal plates and pipes.

Pipes are cut and bend by highly productive cutting and forming equipment. CNC pipe bending machines can bend pipes up to 8 inches. Pipe shop has facilities to flush hydraulic piping and to hydraulically pipes and fittings.


Cranes and the Load Transportation

  • Pier cranes of 1 x 20, 3 x 25 & 1 x 40 tons

  • Land mobile cranes up to 90 tons

  • Travelling jib cranes

  • Forklifts

  • Cherry pickers

  • Moving platforms



Featured projects