This Belfast firm, which designs and installs underground cabling networks, has laid almost 3,000 miles of undersea fibre-optic cables between the UK and the US to create the fastest data connection yet between the two countries. Exports hit £3.3m in 2015 and M&M hopes to win more contracts for power and telecoms lines crossing the Celtic Sea to Europe. Founded in 1980 by Noel Loye, 65, the firm is run by his son, Gareth, 36.

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Company details
Year2017
Rank24
CompanyM&M Contractors
ActivityInfrastructure services provider
LocationBelfast
2 yr av intl sales growth % pa95.37%
International sales £000s*3,254
Total sales £000s*11,830
Staff46
Founded1980
Websitewww.mm-contractors.com

If applicable:

* Supplied by company † Annualised figure