| Adam Smith | London, Westminster Tower, Greater London | 9 | 3 |
| Palladium | London, Plymouth, Central | 10 | 11 |
| Oxford Policy Management | Oxford | 10 | 13 |
| DAI Global | Apsley, Hemel Hempstead | 6 | 4 |
| Ecorys | Birmingham, West Midlands, London | 5 | 10 |
| IMC Worldwide | Redhill, Surrey | 5 | 3 |
| GW Consulting | London | 5 | 3 |
| Mott Macdonald | Cambridge, Croydon, Greater London | 4 | 60 |
| Population Council | New York | 4 | 2 |
| ISS Facility Services SA de CV | Estado de Mexico, México, Naucalpan de Juarez | 4 | 4 |
| Cowatersogema | Ottawa, Golden Horseshoe | 3 | 2 |
| International Rescue Committee | New York, London | 3 | 3 |
| Synergy Plus | Yangon, Botahtaung | 3 | 3 |
| Deloitte | London | 4 | 122 |
| Integrity Research & Consultancy | London | 4 | 4 |
| Leidos Innovations | Glasgow | 4 | 2 |
| Pricewaterhousecoopers | London | 3 | 75 |
| Vodafone | West Berkshire, Newbury | 3 | 32 |
| London School of Hygiene & Tropical Medicine | London | 3 | 3 |
| Chemonics | Washington, London | 3 | 5 |
| KBR | None, London | 3 | 3 |
| Options Consultancy Services | London | 3 | 3 |
| Crown Agents Bank | Sutton | 3 | 2 |
| G4S Facility Services India Private | Delhi, New Delhi | 3 | 2 |
| Tetra TECH International Development | Reading | 3 | 2 |
| Jani King of Ottawa | Ottawa, Ontario | 3 | 3 |
| Liverpool School of Tropical Medicine | Liverpool | 3 | 3 |
| KPMG | Tower Hamlets, London | 2 | 102 |
| Capgemini | Woking, Forge End | 2 | 36 |
| Boston Consulting Group | London | 2 | 22 |
| Manchester University | Manchester | 2 | 15 |
| EBSCO | Enfield | 2 | 15 |
| Leeds University | Leeds | 2 | 6 |
| Ima World Health | Washington | 2 | 2 |
| Ipe Global | New Delhi, Delhi | 2 | 3 |
| Esegur Empresa de Segurança | Lisbon, Prior Velho | 2 | 2 |
| Safedriver NG | Berlin | 2 | 2 |
| Synergy Security Solutions | County Dublin | 2 | 2 |
| Axiom | Vale of White Horse, Newbury | 2 | 2 |
| Broker Seguranza Cia | None, Quito | 2 | 2 |
| Bupa Arabia for Cooperative Insurance | Riyadh | 2 | 2 |
| D3P Global | Brighton, Withdean Court Avenue Brighton | 2 | 2 |
| First Option Safety Group | London, Westminster | 2 | 2 |
| G4S Facility Services India | New Delhi, Haryana | 2 | 2 |
| Global Partners Governance | London, Cambridge Heath Road London | 2 | 2 |
| Intercon Servicios de Seguridad Privada SA de CV | Mexico City | 2 | 2 |
| Masta | Leeds | 2 | 2 |
| Metlife | New York | 2 | 2 |
| Montrose | Kampala, Channel Islands | 2 | 2 |
| Myanmar Jardine Schindler | Yangon | 2 | 2 |
| Ovps Fcdo Services | Milton Keynes, Hanslope Park Milton Keynes | 2 | 2 |
| Pgi Protection Group | London | 2 | 2 |
| Prosegur | Buenos Aires | 2 | 2 |
| Pure Energie | Amsterdam, None | 2 | 2 |
| Securitas NV | Ville de Bruxelles - Stad Brussel, Neder Over Heembeek | 2 | 2 |
| Support Revolution | Thatcham | 2 | 2 |
| Orostream International Contracts | Crowborough | 3 | 4 |
| Fcdo Services Ovps | Milton Keynes | 3 | 3 |
| Oracle Corporation | Reading | 2 | 33 |
| DAI Europe | Hemel Hempstead | 2 | 14 |
| Capita Resourcing | London | 2 | 3 |
| Alinea | London | 2 | 2 |
| Guard One | Bucharest | 2 | 2 |
| Aetna | Hartford | 2 | 2 |
| Bankers Asurance Sal | Beirut | 2 | 2 |
| Bright Horizons Family Solutions | Rushden | 2 | 2 |
| Cigna | Bloomfield | 2 | 2 |
| Ics Premier Energy | Chisinau | 2 | 2 |
| Icts Italia | Rome | 2 | 2 |
| Innovation & Insight FZ LLC | | 2 | 2 |
| Jones Lang Lasalle Property Consultants Pte | North East | 2 | 2 |
| Motores Britanicos de Costa Rica | Costa Rica | 2 | 2 |
| Prudent Insurance Brokers | Haryana | 2 | 2 |
| Securitas GMBH Sicherheitsdienste | Berlin | 2 | 2 |
| Sheehy Ford | Springfield | 2 | 2 |
| Tenax | Bromley | 2 | 2 |
| Civica | London | 1 | 86 |
| Ove Arup & Partners | Greater London | 1 | 72 |
| Bytes Software Services | Leatherhead | 1 | 70 |
| PA Consulting Services | London | 1 | 54 |
| Ridge & Partners | Woodstock | 1 | 38 |
| BDO | London | 1 | 32 |
| Atos IT Services | London | 1 | 29 |
| Allen Lane | London | 1 | 45 |
| Bramble Hub | London | 1 | 18 |
| CGI IT | London | 1 | 21 |
| Senator | Accrington | 1 | 17 |
| Woods Building Services | Harlow | 1 | 9 |
| Tribal Education | Bristol | 1 | 8 |
| ICF Consulting Services | London | 1 | 8 |
| Flyform | Cardiff | 1 | 7 |
| Corporate Travel Management North | Bradford | 1 | 6 |
| Deloitte MCS | London | 1 | 7 |
| North Highland | London | 1 | 5 |
| Oxford University | Oxford | 1 | 6 |
| WYG | Leeds | 1 | 6 |
| Carbon Trust Advisory | Stamford Street London | 1 | 7 |
| Vivid Economics | London | 1 | 5 |
| Press Data | London | 1 | 6 |
| Financial Times | London | 1 | 4 |