| 1ST Point Security Services Ltd | Edinburgh | 2016 |
| 1ST Premier Limited | Botesdale | 2011 |
| 1ST Prestige Care Ltd | London | 2014 |
| 1ST Principals Ltd | Sheffield | 2025 |
| 1ST PS Limited | Tunbridge Wells | 2017 |
| 1ST Pulse Ltd. | St Neots | 2016 |
| 1ST Rapid Property Services Ltd | London | 2013 |
| 1ST Reaction Security Limited | Kettering | 1999 |
| 1ST Rescue and Recovery Ltd | Stockport | 2023 |
| 1ST Resource Consultancy Ltd | Leeds | 2012 |
| 1ST Response Marketing Ltd | Manchester | 2017 |
| 1ST Response Recovery Limited | Tadcaster | 2008 |
| 1ST Response Site Supplies Ltd | Rayleigh | 2010 |
| 1ST Safe & Sound Limited | Essex | 1999 |
| 1ST Safety and Training Solutions Ltd | Cambridge | 2009 |
| 1ST Secure Ltd | Ilford | 2016 |
| 1ST Security Solutions Limited | Doncaster | 2004 |
| 1ST Select Limited | Leeds | 2016 |
| 1ST Sentry Group Ltd | London | 2025 |
| 1ST Serve Limited | Newent | 2021 |
| 1ST Shield Security Service Limited | London | 2022 |
| 1ST Staff Limited | Epping | 2014 |
| 1ST Star Limited | Swindon | 2013 |
| 1ST Step Solutions Limited | Basildon | 2004 |
| 1ST Stop Cleaning Ltd | Chorley | 2015 |
| 1ST Stop Facilities Ltd | Ringwood | 2024 |
| 1ST Stop Fire and Security Solutions Limited | Leicester | 2018 |
| 1ST Stop Property Services Limited | Swansea | 2015 |
| 1ST Stop Recruitment Ltd | Norwich | 2008 |
| 1ST Stop Vehicle Solutions Ltd | Blackburn | 2019 |
| 1ST Support Group Ltd | Burnham-On-Sea | 2019 |
| 1ST Take Action Drivers Limited | Romsey | 2019 |
| 1ST Team Consultants Limited | Ruislip | 2024 |
| 1ST TEE Treks Limited | Verwood | 2023 |
| 1ST Thought Business Support Ltd | Hove | 2019 |
| 1ST Tickets Limited | Bedford | 2007 |
| 1ST Time Maintenance Ltd | London | 2015 |
| 1ST Time Wright Limited | Lanark | 2023 |
| 1ST UK Services Limited | Birmingham | 2022 |
| 1ST United Care Ltd | Batley | 2026 |
| 1ST Vending Ltd | Warrington | 2002 |
| 1ST Virtual PA Limited | Leeds | 2017 |
| 1ST Waste Recycling Limited | Hertford | 2004 |
| 1ST Web Media Limited | Sutton Coldfield | 2008 |
| 1ST Wholesale Ltd | Manchester | 2012 |
| 1ST Work Force Ltd | Hounslow | 2022 |
| 1ST Xtreme Cleaning Ltd | Leeds | 2025 |
| 1ST-DIRECT.COM Ltd | Ringwood | 2008 |
| 1ST-EUROPEAN Limited | Berkshire | 1996 |
| 1ST. Choice Cleaning Limited | London | 2001 |
| 1ST. Industrial & Commercial Services Limited | Rochester | 1984 |
| 1ST4 Business Services Ltd | Harrogate | 2009 |
| 1STCLAIMS Limited | Goodwick | 2008 |
| 1STCLASSCHAUFFERING Limited | Birmingham | 2023 |
| 1STCLASSFINISH.CO.UK Ltd | Glasgow | 2019 |
| 1STINCARE Ltd | Stockport | 2022 |
| 1STOPFACILITIES Ltd | Manchester | 2025 |
| 1STOPMONEYHELP Ltd | London | 2025 |
| 1STPAYSGROUP Ltd | Birmingham | 2025 |
| 1SW London Limited | Cardiff | 2010 |
| 1TECH OPS Limited | Grimsby | 2016 |
| 1TECH Staffing Limited | Barnsley | 2022 |
| 1TO1 Group Limited | Winchester | 2011 |
| 1TO1 Paraplanning Ltd | Chichester | 2017 |
| 1TO1SALES Ltd | Birmingham | 2025 |
| 1TSY Limited | Chelmsford | 2022 |
| 1UP Solutions Limited | Wolverhampton | 2015 |
| 1V RAR Ltd | Hemel Hempstead | 2025 |
| 1WEIGH Limited | Tyne And Wear | 2005 |
| 1WORLD Xzibitz Limited | Reading | 2013 |
| 1X1 Cleaning Solutions Ltd | London | 2021 |
| 1XZ Ltd | Glasgow | 2024 |
| 2 (UK) Limited | Surrey | 2004 |
| 2 BE Free Indeed Ltd | Bristol | 2021 |
| 2 Brothers Plant Limited | Portsmouth | 2024 |
| 2 Build Exhibitions Limited | Tadley | 2009 |
| 2 by 2 Holidays Limited | London | 2003 |
| 2 C Recruitment Ltd | Glasgow | 2016 |
| 2 C Solutions Limited | Southend On Sea | 2021 |
| 2 Castle Street Limited | Stevenage | 2015 |
| 2 Clayton Street Management Company Limited | Bristol | 2007 |
| 2 Clean 4 U (N.I.) Ltd | Derry | 2021 |
| 2 Clean Plus Limited | Warwick | 2005 |
| 2 Cool Friends & Co Limited | North Cheam | 2006 |
| 2 Counties Independent Film Festival Ltd | Newport Pagnell | 2025 |
| 2 Cousins Powered Access Limited | York | 2008 |
| 2 Degrees Limited | Oxford | 2008 |
| 2 Devonshire Road RTM Company Limited | Hastings | 2011 |
| 2 Drumkinnon Ltd | Ruislip, | 2024 |
| 2 Dulwich Road Management Limited | London | 2001 |
| 2 Entertain Limited | London | 2004 |
| 2 Epirus Road Limited | London | 2019 |
| 2 Excel Aviation Limited | Northampton | 2005 |
| 2 Excel Bidco Limited | London | 2024 |
| 2 Excel Design Limited | London | 2005 |
| 2 Excel Management Limited | London | 2013 |
| 2 Forks and a Spade Ltd | Barnet | 2020 |
| 2 Four 6 Solutions Limited | Borehamwood | 2023 |
| 2 Group Solutions Ltd. | London | 2025 |
| 2 Harrow RD Ltd | Herefordshire | 2003 |