74. Brett Martin
- Managing director: Laurence Martin
- Pre-tax profit: £4.7m
- Employment: 655
- Pay bill: £11.2m
Newtownabbey-based Brett Martin is Northern Ireland’s largest thermoplastics manufacturer with sales of £136.4m in 2015.
Established in 1958, the company has grown in significance to become one of the largest manufacturers of polycarbonate in Europe.