Marine civil and offshore construction contractor

Penta-Ocean Construction

Wartsila rendering of Penta-Ocean's Cassiopeia V cutter suction dredger underway with its cutter ladder at the bow

Wartsila (rendering)

Penta-Ocean Construction is a Japanese contractor founded in 1896, with marine civil engineering at the centre of a broader civil and building business.

Organization overview

Marine civil and offshore construction contractor

Geographic footprint: Global, including Asia Pacific, Middle East, and Africa. Core marine roles: Marine civil contractor, Dredging and reclamation contractor, Marine ground improvement contractor, and Caisson and wharf contractor.

Project records 3 Last reviewed 14 August 2026

Type

Marine civil and offshore construction contractor

Active regions

Asia Pacific, Middle East, Africa, Global

Marine works roles

Marine civil contractor, Dredging and reclamation contractor, Marine ground improvement contractor, Caisson and wharf contractor, Marine plant owner, Offshore wind marine construction contractor

Role in marine infrastructure

Penta-Ocean Construction is a Japanese contractor founded in 1896, with marine civil engineering at the centre of a broader civil and building business. For the year ended March 2026, the group reported JPY 794.3 billion in consolidated net sales and 3,991 employees, or 5,834 including locally hired overseas and temporary staff. Its international business is headquartered in Singapore, supported by branches and regional offices across Asia, the Middle East and Africa. Marine capability covers dredging, reclamation, caissons, wharves, soft-ground improvement and specialist construction vessels. The fleet and group-company network extend into offshore wind through CP-8001, CP-16001 and Japan Offshore Marine's Sea Challenger. Linked records establish bounded roles in the Tuas Phase 2 joint venture, Patimban Package 6 consortium and Oga-Katagami-Akita vessel programme.

Related records 3

Sources used 11

Source collections