From the freezing tundra of Siberia to the sweltering deserts of the Middle East, this group has 8,000 staff working in more than 20 countries, manufacturing, managing, operating and servicing drilling rigs for the oil and gas industry. The Aberdeen group was bought by the private equity firm First Reserve for £906m in 2008, but struggled to service debts of over £1bn. First Reserve walked away in November 2010, leaving control in the hands of Pamplona Capital, an investment firm based in London, now its biggest shareholder. It is led by chief executive Norrie McKay, 55. Last year KCA refinanced $750m (£484m) of debt.

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Company details
Year2015
Rank36
CompanyKCA DEUTAG Group
ActivityDrilling contractor
LocationAberdeen
Sales £m1,284
Profit £m191
Year endDec 14
Principal shareholdersPamplona Capital, other investment funds, management
Staff7,988
Founded1995
Websitewww.kcadeutag.com

If applicable:

* Supplied by company † Annualised figure