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Having made light-blocking ventilation equipment to keep factories safe during Second World War blackouts, Colt now designs and services smoke control, ventilation, climate control and solar shading for its clients. The group’s climate technology sector grew in 2016 with increased demand, particularly in Europe, for environmentally sustainable buildings and infrastructure. Still owned by the founding O’Hea family, the Hampshire firm is led by chief executive Mark Oliver, 55.

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Company details
ActivityVentilation systems provider
Sales £m158.2
Operating profit £m7.5
Main shareholdersO'Hea family (78%), Colt Foundation (22%)

If applicable:

* supplied by company   † annualised figure   ‡  profit = ebitda