This Hertfordshire civil engineering contractor started in 2000 as a rail sector specialist, but has since diversified into roads, electricity pylons and renewable energy. Network Rail has remained a key client, but Aspin Group has also worked on projects for Carillion and Balfour Beatty. The acquisitions of McGrattan Piling in 2013 and bridge inspection firm RSI in 2014, both for undisclosed sums, helped founders Barry McMahon, 43, and Andy Hoffman, 45, raise revenues to £38.5m this year. Earlier this year, they sold a minority stake to LDC in return for a £25m investment.
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