Coca-Cola, Sir Robert McAlpine and the National Grid are just some of this environmental consultancy’s customers. Operating from 79 international offices and led by chief executive Neil Penhall, 54, the Aylesbury firm focuses on six sectors including infrastructure, power, and oil and gas. In June, private equity firm Charterhouse Capital Partners acquired a majority stake in the business, with 3i selling its stake.

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Company details
Year2018
Rank246
CompanySLR
ActivityEnvironmental consultancy
LocationBuckinghamshire
Sales £m†127.2
Operating profit £m†5.4
Main shareholdersCharterhouse Capital partners (>50%), management (<50%)
Staff1,184
Founded1994
Websitewww.slrconsulting.com

If applicable:

* supplied by Company   † annualised figure   ‡  profit = ebitda