Antrim-based specialist plastics-maker Brett Martin is owned by brothers William (59) and Brian (55) Martin. The manufacturing company, which made the roof for Arsenal's Emirates stadium and police riot shields, employs 580 people at several locations in the North and around the UK. Profits in 2016 amounted to 3.7m on a turnover of 109m. Interim dividends totalling 3m were paid out. The firm is sitting on retained earnings of 38m.