Customers of this specialist joinery and fit-out business include Norwegian Cruise Lines, Royal Caribbean and Carnival Cruise Lines. The Co Down company was founded in 1983 by chairman Brian McConville, 58, who also owns Mivan (No 108). In 2018, MJM completed its first project in China and opened an office in Poland, helping international sales reach £92.5m. Last year, the company led the refit of the Norwegian Joy cruise ship, which had a team of 1,400 work while travelling from Singapore to Seattle over 49 days.
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