Welcome to ONEX Group

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

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.

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.

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.

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.

Get in touch with ONEX Group

BUSINESS SECTOR

Defense & Naval Programs

ONEX Shipyards & Technologies Group’s naval shipbuilding infrastructure and experience, enable the development of modern manned and unmanned surface and underwater naval units, integrating cutting edge technologies, designed to secure maritime supremacy. The Group’s proven shipbuilding capabilities, reinforced by the strategic locations of ONEX Shipyards in Elefsis and Syros, enables ONEX to provide naval construction, fleet sustainment, modernization, integrated logistics, and fleet life-time technical support.

ONEX's power in numbers

Defense-sector vessels
constructed

€0m

investment plan in Greece
over the next 10 years

0k+

jobs creation within
the first 3 years

autonomous units establishment
(commercial, engineering & naval)

strategic locations in
Elefsina & Syros

ship constructions per
annum capability

Main Capabilities

Construction

2-3 ships per year

New Designs & New Buildings

- Fast Attack Crafts
- Corvettes / Frigates
- Submarines
- Manned/unmanned sea & - underwater vessels

Programs

MLU & New buildings programs of the HN, HCG and other Nations

Repair & maintenance

Repair & maintenance of naval platforms of the HN, HCG & Other Nations

SPMT’s

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

The ONEX Plan

Modernization of the ONEX Shipyards
Implementation of Environmental Management
Establishment of 3 autonomous units (commercial, engineering & naval)
Investment of approx. €500M in 10 years (upgrade of facilities & infrastructure, acquisition of 2 Floating Docs, modernization of production & machinery, implementation of environmentally friendly technologies in production)
Utilization of total available land and port of the ONEX Elefsis Shipyards
Creation of 3.000 jobs in total (1.500 in naval & 1.500 in commercial/engineering) within the first 3 years
Training update/upgrade of existing & new workforce
Strategic partnership with Greek Public Employment Service (DYPA) – Modernization of Public Elefsis Technical Schools’ syllabus, labs & practice programs
Establishment of Technical School in Syros

Defense Systems & Integrated Support

The ONEX defense ecosystem

The defense ecosystem extends beyond shipyards. Through ONEX Technology Systems & Business Solutions, the Group supports integrated logistics, aviation MRO-related services, ordnance and ammunition support, surveillance systems, special equipment, secure communications, C4I-type applications and critical defense infrastructure.

The Group’s defense footprint includes naval projects, ammunition and missiles, aircraft maintenance support, surveillance and X-ray systems, lubricants and chemicals, and specialized personal equipment. This creates a broad industrial-defense support platform rather than a narrow shipyard-only capability.

Fleet Sustainment & Operational Readiness

ONEX provides a complete support framework for naval platforms, systems and equipment. This includes scheduled and unscheduled maintenance, subsystem repair and overhaul, engineering analysis, technical assistance, new systems integration, document digitization and secure support services.

This capability is essential for fleet readiness. It allows naval operators to extend asset life, reduce downtime, manage obsolescence and maintain operational effectiveness through long-term industrial support.

Further Capabilities:
- Cooperation with the Greek shipbuilding / ship repair & maintenance ecosystem
- Extroversion, Innovation, Participation in R&D Programs

Featured projects

DEFENSE & NAVAL

Development of Autonomous Systems-Unmanned Surface Vessels

ONEX Group is expanding its capabilities into advanced autonomous systems and unmanned surface vessel (USV) technologies, supporting the future of maritime operations, defense support, surveillance, and smart naval infrastructure.