Mitsui E&S Holdings has decided to sell its 49.5% shareholding in compatriot shipbuilder Shikoku Dock.
The move is part of its business plan to move away from shipbuilding production in Japan.
Mitsui E&S is the largest shareholder in Shikoku Dock, followed by Shikoku Industries, which holds a 42% stake in the company.
The buyer of the shares, and the value of the transaction, has not been disclosed by Mitsui E&S.
