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Osmose Acquires Mainswest to

Mainswest acquired by Osmose

AcquisitionConstructionAU

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Acquired

Mainswest

AustraliaConstruction

Undisclosed amount

January 29, 2026

Osmose logo
Acquirer

Osmose

Utilities

Osmose has acquired Mainswest for an undisclosed amount, marking a significant expansion in infrastructure services. Mainswest, a Western Australian civil and electrical contracting organisation, specialises in the construction and maintenance of underground utilities. This acquisition sees Osmose, a prominent infrastructure services provider, integrate Mainswest's specialized capabilities into its operations.

Mainswest is known for its comprehensive suite of services, including high voltage and low voltage cable installation, jointing, and testing, as well as fibre optic network installations. The company also performs horizontal directional drilling and open trenching, pit and pipe installations for electrical and communications networks, and the supply, installation, and maintenance of street lighting towers. Further expertise extends to substation maintenance and upgrades, electrical testing, cable fault locating, and switchboard design and manufacture. Mainswest prides itself on delivering effective, end-to-end solutions to clients across Western Australia, driven by a commitment to quality and innovation.

The acquisition is strategically aimed at strengthening Osmose's service portfolio and expanding its geographic footprint. Mainswest's deep expertise in critical underground utility infrastructure and its established presence in Western Australia complement Osmose's existing operations. This integration is expected to create synergies by combining Mainswest's operational proficiency and regional market understanding with Osmose's broader resources and scale. The move will enable the combined entity to offer a more comprehensive and integrated range of civil and electrical contracting services to a wider client base.

Looking ahead, the unified organisation is positioned to enhance service delivery and drive further innovation in the infrastructure sector. The integration of Mainswest's skilled workforce and specialized capabilities under the Osmose umbrella is anticipated to provide robust solutions for the evolving demands of utility and communications infrastructure development and maintenance.

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