| 1ST Choice Travel Ltd | Chesterfield | 2022 |
| 1ST Choice Travel Services Limited | Maidstone | 1991 |
| 1ST Choice Umbrella Ltd | Birmingham | 2018 |
| 1ST Choice Valeting Limited | Crawley | 2019 |
| 1ST Choice Vehicle Rentals Ltd | Broadstone | 2023 |
| 1ST City Fleet Limited | London | 2001 |
| 1ST City Self Drive Ltd | London | 2023 |
| 1ST City Van Hire Limited | London | 2010 |
| 1ST Civils Ltd | Manchester | 2017 |
| 1ST Claim Solutions Ltd | Knowsley | 2010 |
| 1ST Class Alloys Ltd. | Hamilton | 2016 |
| 1ST Class Cleaning Limited | Hull | 2026 |
| 1ST Class Cleaning Services Ltd | London | 2025 |
| 1ST Class Detailing Ltd | London | 2022 |
| 1ST Class Drive Cleaning Limited | Consett | 2025 |
| 1ST Class Driving UK Limited | Surrey | 2006 |
| 1ST Class Energy (Scotland) Limited | Dundee | 2026 |
| 1ST Class Energy Training & Assessment Ltd | Dundee | 2023 |
| 1ST Class Fencing & Landscaping Limited | Worcester Park | 2012 |
| 1ST Class Garden Services Ltd | Coatbridge | 2014 |
| 1ST Class Holidays Limited | Manchester | 1997 |
| 1ST Class Homes Limited | Potters Bar | 2003 |
| 1ST Class Housekeepers Ltd | Arbroath | 2024 |
| 1ST Class Logistics UK (Holdings) Ltd | Basingstoke | 2023 |
| 1ST Class Recruitment Limited | Bramcote | 2015 |
| 1ST Class Results Ltd | St. Asaph | 2015 |
| 1ST Class Security Limited | Cheltenham | 2010 |
| 1ST Class Security Services Limited | Doncaster | 2022 |
| 1ST Class Security Solutions Limited | Doncaster | 2025 |
| 1ST Class Sparks Services Ltd | London | 2021 |
| 1ST Class Storage Ltd | Leeds | 2023 |
| 1ST Class Training International Ltd | Manchester | 2019 |
| 1ST Class Travel Limited | Keighley | 2010 |
| 1ST Classs Cleaning Limited | Birmingham | 2015 |
| 1ST Cleaning Ltd | Manchester | 2026 |
| 1ST Cleaning Professionals Ltd | Edgware | 2019 |
| 1ST Clear Flow Limited | Worthing | 2000 |
| 1ST Collection Services Limited | Cranford | 1998 |
| 1ST Commercial Cleaning Limited | Ferndown | 2016 |
| 1ST Companyuk Limited | London | 2020 |
| 1ST Contact Ltd | Manchester | 2024 |
| 1ST Converged Solutions Ltd | Wirral | 2010 |
| 1ST Corporate Security Ltd | Glasgow | 2014 |
| 1ST CPM Limited | Bromley | 2016 |
| 1ST Credit Management Ltd | Birmingham | 2025 |
| 1ST Crescent Ltd | Middleton | 2024 |
| 1ST Customs Intermediary (PJ) Ltd | Dover | 2015 |
| 1ST D'Zine Office Solutions Ltd | Cardiff | 2020 |
| 1ST Dawn Limited | London | 2020 |
| 1ST Defence Ltd | London | 2021 |
| 1ST Defence Security Service Ltd | London | 2023 |
| 1ST Direct Mail Limited | Surrey | 1994 |
| 1ST Direct Vehicle Rentals Ltd | Portsmouth | 2017 |
| 1ST Encounter Ltd | London | 2024 |
| 1ST Event Solutions Limited | Carnforth | 2008 |
| 1ST Executive Limited | Woking | 2003 |
| 1ST Facility Management Limited | Hollinwood | 2015 |
| 1ST for Commercial Ltd | Lancashire | 2004 |
| 1ST for Energy Ltd | Thornton Cleveleys | 2009 |
| 1ST for Pets Limited | Malton | 2019 |
| 1ST for Training Limited | Cannock | 2004 |
| 1ST Formations Limited | London | 2014 |
| 1ST Front Door Security Ltd | London | 2023 |
| 1ST Garden Maintenance Limited | Eastleigh | 2011 |
| 1ST Glass Window Cleaning Ltd | Thatcham | 2014 |
| 1ST Green Deal Ltd. | Cardiff | 2012 |
| 1ST Group Ltd | Fareham | 2008 |
| 1ST Guarding UK Ltd | Wembley | 2021 |
| 1ST Healthcare Group Limited | Waterlooville | 2019 |
| 1ST Hire Limited | Sutton | 2007 |
| 1ST Impression (Manchester) Limited | Manchester | 2004 |
| 1ST Impressions Signs and Graphics Limited | Swindon | 2006 |
| 1ST in Line Cleaning Services Limited | Southampton | 2018 |
| 1ST in View Systems Limited | Richmond | 2023 |
| 1ST Industrial Holdings Ltd | Rochester | 2021 |
| 1ST Intervention Care Ltd | Thame | 2021 |
| 1ST K9 Security Limited | London | 2022 |
| 1ST Klas Cleaning Services Limited | Southampton | 2013 |
| 1ST Lettings (Yorkshire) Limited | Wakefield | 2008 |
| 1ST Limited | Surrey | 1995 |
| 1ST Logistic Solutions Ltd | London | 2025 |
| 1ST Look Fire & Security Solutions Limited | Colne | 2024 |
| 1ST Look Fire & Security Systems Limited | Colne | 2021 |
| 1ST Management Sloutions Limited | Bolton | 2018 |
| 1ST Metropolitan Locksmiths Limited | London | 1991 |
| 1ST National Property Services Limited | Cambridge | 1994 |
| 1ST National Security Ltd | Waltham Abbey | 2019 |
| 1ST Nationwide Security Ltd | Wimbledon | 2010 |
| 1ST Nominees Limited | Spellbrook | 2002 |
| 1ST Note Education Limited | St Albans | 2012 |
| 1ST Office Equipment Limited | Bath | 1998 |
| 1ST Payments Ltd | Livingston | 2023 |
| 1ST Penguin Shipping Holdings Limited | Fareham | 2021 |
| 1ST Penguin Shipping Limited | Whiteley | 1997 |
| 1ST Pixel Ltd | London | 2025 |
| 1ST Place Business Travel Limited | Birmingham | 2024 |
| 1ST Point (UK) Limited | Hillingdon | 1999 |
| 1ST Point 2020 Ltd | Uxbridge | 2020 |
| 1ST Point Fire Security Ltd | London | 2024 |
| 1ST Point Limited | Stourbridge | 2012 |