Glasgow-based GAP Holdings, a plant and tool hire business, was founded in 1969 by the late Gordon Anderson, and now run and largely owned by his two sons, Douglas and Iain. In 2013-14, its profits hit a record £13.5m on £118.4m sales.
Activity: Plant and tool hire
Latest turnover: £118m
Five-year rise in turnover: 74%
No. of employees: 1,049
Five-year rise in employment: 36%