| Smartsourcing | Castle Point, South Benfleet, Newcastle-under-Lyme | 20 | 64 |
| Jaguar Land Rover | Coventry, Whitley | 24 | 59 |
| Hellmann Worldwide Logistics | Lichfield | 12 | 26 |
| Parity Professionals | Southwark, London, City of London | 11 | 16 |
| Cogent Electrical Services | Newham, Hammersmith and Fulham, London | 8 | 12 |
| Stafford Long | Tower Hamlets, City of London, London | 5 | 8 |
| LA International Computer Consultants | Stoke-on-Trent, Stoke on Trent | 28 | 85 |
| Solirius | Harrow, London | 16 | 12 |
| Computacenter | Welwyn Hatfield, Hatfield | 14 | 118 |
| Certes Computing | North Warwickshire, Coleshill | 14 | 44 |
| Morson | Salford, Manchester | 11 | 59 |
| Spring Technology | Solihull, Milton Keynes | 8 | 24 |
| Healix | Richmond upon Thames, Esher | 8 | 9 |
| WYG Group | Leeds | 7 | 38 |
| Retearn Group | London, Ascot | 5 | 10 |
| Parogon Contracts | Guildford, Pirbright | 5 | 4 |
| Adblu | Fujairah | 4 | 10 |
| RS Components | Corby | 3 | 15 |
| PDP Projects | East Northamptonshire, Peterborough | 3 | 7 |
| Toyota Gibraltar Stockholdings | Sutton | 3 | 13 |
| Orostream International Contracts | Crowborough, Wealden | 2 | 4 |
| Knight Cross Company Nigeria | Southwark, Durumi District | 2 | 3 |
| Cxpeople | Bushey, Hertsmere | 2 | 2 |
| Hays Specialist Recruitment | Camden | 9 | 80 |
| NSSL Global | Redhill | 5 | 13 |
| Toyota Gibraltar Stockholding | | 5 | 5 |
| Fluxx | Southwark | 4 | 5 |
| Specialist Computer Centres | Birmingham | 3 | 122 |
| Incendium Consulting | London | 3 | 8 |
| Smartsourcing Group | Castle Point | 3 | 3 |
| Vodafone | West Berkshire | 2 | 32 |
| Methods Business & Digital Technology | Camden | 2 | 40 |
| QA Ltd | Slough | 2 | 12 |
| Michael Page International Recruitment | Runnymede | 2 | 9 |
| Concept Building Services Southern | Chichester | 2 | 9 |
| Lorien Resourcing | Luton | 2 | 3 |
| STR | Portsmouth | 2 | 11 |
| Jaguar Landrover | Coventry | 2 | 2 |
| Kuehne Nagel | Hillingdon | 2 | 2 |
| Nexor | Nottingham | 2 | 2 |
| AECOM | London | 1 | 137 |
| Atkins | Epsom and Ewell | 1 | 128 |
| Pricewaterhousecoopers | London | 1 | 75 |
| Banner Group | Normanton | 1 | 26 |
| Willis | City of London | 1 | 15 |
| Edmundson Electrical | Cheshire East | 1 | 14 |
| Badenoch & Clark | Tower Hamlets | 1 | 17 |
| Kingdom Services Group | St. Helens | 1 | 15 |
| Yesss A Electrical | Wakefield | 1 | 8 |
| Engie | | 1 | 10 |
| Pitney Bowes | Hatfield | 1 | 7 |
| Dac Beachcroft | London | 1 | 6 |
| Ashdale Engineering | Bristol, City of | 1 | 8 |
| Incredible Computers | Lisburn and Castlereagh | 1 | 4 |
| Saxton Bampfylde Hever | London | 1 | 4 |
| Impulse Engineering | Farnham | 1 | 4 |
| Travelhire | Brentford | 1 | 4 |
| SVGC | Salisbury | 1 | 3 |
| Wessex Translations | Test Valley | 1 | 5 |
| Gilbert Ash | Belfast | 1 | 3 |
| Digital Id | Milton Keynes | 1 | 2 |
| Interquest Group | Dacorum | 1 | 2 |
| Rapiscan Systems | London | 1 | 2 |
| Orbit Electrical Services | Scarborough | 1 | 10 |
| OSI Contracts | Crowborough | 1 | 6 |
| Barton Engineering & Export | Canterbury | 1 | 4 |
| Antoinette Oglethorpe | Central Bedfordshire | 1 | 3 |
| Lilleker Brothers Nigeria | | 1 | 2 |
| Axon Resourcing | Manchester | 1 | 6 |
| Duvine | Romsey | 1 | 3 |
| Testworks Group | North Hertfordshire | 1 | 3 |
| Apt Health & Safety Training Solutions | Stoke-on-Trent | 1 | 2 |
| Daisy Corporate Services | Pendle | 1 | 2 |
| Mohammed Ziad Tarakji | Elm Grove | 1 | 2 |
| Application Solutions Safety & Security | Lewes | 1 | 1 |
| Brimstone Site Investigation | Rochester | 1 | 1 |
| Cloud Computing Services | Hounslow | 1 | 1 |
| Elysium Construction | Hackney | 1 | 1 |
| Fletcher Construction | Penrose | 1 | 1 |
| Hellmann Worldwide Logistics Ltdes13 8SX | Lichfield | 1 | 1 |
| Hellmanns Worldwide Logistics | Lichfield | 1 | 1 |
| Kaplan Performance Academy | London | 1 | 1 |
| KL Communications | Kingston upon Thames | 1 | 1 |
| Konsolute | Hounslow | 1 | 1 |
| Lynda Connerton | Dartford | 1 | 1 |
| Maintenance & Construction Services | Bridgetown | 1 | 1 |
| Masta | Coventry | 1 | 1 |
| Nazih Hijazi | | 1 | 1 |
| Scot Group | Exeter | 1 | 1 |
| Skyline Taxi & Private Hire | Milton Keynes | 1 | 1 |
| Skylineline Taxi & Hire Purchase | Milton Keynes | 1 | 1 |
| Sovereign | Sefton | 1 | 1 |
| Starkold Building Services | County Durham | 1 | 1 |
| Stylus Translation Philippe Galinier | Hammersmith and Fulham | 1 | 1 |
| Synthesis Advisory | Newcastle-under-Lyme | 1 | 1 |
| Tennyson Suite | Eastbourne | 1 | 1 |
| Tier 3 Pty | | 1 | 1 |
| Toyota Gilbraltar Stockholdings | Sutton | 1 | 1 |
| Ubiqus | Orpington | 1 | 1 |
| Union Infrastructure Sade CV | Cdmx | 1 | 1 |