63. Brett Martin Holdings
- Chief executive: Laurence Martin
- Pre-tax profit: £7.3m
- Employment: 935
- Pay bill: £30.3m
Newtownabbey-based Brett Martin is Northern Ireland’s largest thermoplastics manufacturer with sales of £124.4m in 2016.
Established in 1958 the company has grown in significance to become one of the largest manufacturers of polycarbonate in Europe.