| 1ST Step Ltd | Dalkeith | 2022 |
| 1ST Step Mobility Limited | Romford | 2007 |
| 1ST Steps Technologies Ltd | Mildenhall | 2024 |
| 1ST Stop (a) Limited | Harrow | 2008 |
| 1ST Stop 4 Tyres and Auto Centre Limited | Kidderminster | 2020 |
| 1ST Stop Audio Visual Limited | Purley | 2002 |
| 1ST Stop Auto Care Limited | Waltham Abbey | 2017 |
| 1ST Stop Cards Limited | Bromsgrove | 2025 |
| 1ST Stop Cars Limited | Essex | 2003 |
| 1ST Stop Consultancy Ltd | Romford | 2020 |
| 1ST Stop Garages Ltd | Sutton Coldfield | 2018 |
| 1ST Stop Halal Ltd | Greenford | 2024 |
| 1ST Stop JAS Ltd | Teignmouth | 2024 |
| 1ST Stop MOT & Service Ltd | Bicester | 2011 |
| 1ST Stop MOT Cardiff Ltd | Cardiff | 2018 |
| 1ST Stop Motor Group Ltd | Cardiff | 2025 |
| 1ST Stop Off-Licence Ltd | Greenford | 2021 |
| 1ST Stop Plumbing Limited | Blackburn | 2025 |
| 1ST Stop Scrap Recycling Ltd | Swansea | 2020 |
| 1ST Stop Stationers Limited | London | 1993 |
| 1ST Style Limited | London | 2024 |
| 1ST Supermarket Ltd | Birmingham | 2026 |
| 1ST Supplies (Scotland) Ltd. | Grangemouth | 2005 |
| 1ST Supply Ltd | Poole | 2021 |
| 1ST Tier Technologies Limited | Slough | 2025 |
| 1ST Time Car Sales Ltd | Fareham | 2020 |
| 1ST Time Cars Ltd | Preston | 2024 |
| 1ST Tooling Limited | Bromsgrove | 2026 |
| 1ST Tower Software Ltd | Manchester | 2023 |
| 1ST Track Dents Limited | St. Albans | 2015 |
| 1ST Trade Ltd | Ilford | 2024 |
| 1ST Trading London Ltd | Wigan | 2010 |
| 1ST Trading Ltd | London | 2019 |
| 1ST Transport Innovation (Reading) Ltd | Reading | 2014 |
| 1ST UK Company Formations Ltd | Harrogate | 2024 |
| 1ST Unicorn Distribution Ltd | Manchester | 2023 |
| 1ST Valet Limited | Manchester | 2018 |
| 1ST Vauxhall Spares Limited | Ilford | 2016 |
| 1ST Vehicle Solutions Ltd | Birmingham | 2015 |
| 1ST Virtual Traders Ltd | Chessington | 2021 |
| 1ST Weigh 2 Travel Limited | Birmingham | 2010 |
| 1ST WET & Wild Limited | East Yorkshire | 2005 |
| 1ST Wheels Car Sales Limited | Beverley | 2024 |
| 1ST4 Servicing & Tyres Ltd. | Basingstoke | 2014 |
| 1ST4LEATHERS Limited | Ipswich | 2023 |
| 1ST4RENT Limited | Corby | 2006 |
| 1START Trading Limited | London | 2019 |
| 1STBABIES Ltd | London | 2025 |
| 1STBLUESAPPHIRE Intercontinental Ltd | Rochester | 2025 |
| 1STGATE Limited | Birmingham | 2025 |
| 1STIGNITE Ltd | Essex | 2025 |
| 1STOP Building Materials Ltd | Thornton Heath | 2025 |
| 1STOP Computer Repairs Ltd | London | 2019 |
| 1STOP MOT Centre Ltd | Nottingham | 2013 |
| 1STOP MOT& Repairs Ltd | Barking | 2017 |
| 1STOP Vehicles Solutions Ltd | Dewsbury | 2025 |
| 1STOP4APET Ltd | Glasgow | 2020 |
| 1STOPDEALSUK Limited | Bolton | 2020 |
| 1STOPELECTRICS Group Ltd | Horsham | 2016 |
| 1STOPFESTIVALSHOP Ltd | Dunkeld | 2025 |
| 1STOPPERFUMESHOP Ltd | London | 2023 |
| 1STOPSHOP4U Ltd | London | 2025 |
| 1STOPSHOPPING Ltd | London | 2025 |
| 1STOPTRAILERS Ltd | Sudbury | 2014 |
| 1STORE Manchester Ltd | Manchester | 2016 |
| 1STPICKJEMZ Ltd | London | 2025 |
| 1STPLACE4TROPHIES Limited | Cradley Heath | 2015 |
| 1STPURE Ltd | Sale | 2018 |
| 1STREP Ltd | Glossop | 2021 |
| 1SUPPLY Limited | Kington | 2025 |
| 1SWIM.COM Limited | Worcester | 2003 |
| 1TCG Majestic Ltd | Portsmouth | 2026 |
| 1THEBREW&CO Ltd | Keighley | 2025 |
| 1TINT Ltd | Basildon | 2026 |
| 1TNE Ltd | London | 2021 |
| 1TOPSHOP Limited | Ilford | 2025 |
| 1TRIGGER Ltd | London | 2025 |
| 1TRM Limited | Birmingham | 2024 |
| 1U Ltd | Uxbridge | 2025 |
| 1UP Automotive Ltd | Nelson | 2022 |
| 1UP Cafe Brighton Ltd | Bradford | 2013 |
| 1UP Enterprise Limited | London | 2020 |
| 1UP Gaming Limited | Woodbridge | 2015 |
| 1UP.TOOLS Limited | London | 2026 |
| 1US (Aberdeen) Ltd. | Edinburgh | 2012 |
| 1UTHEALTH Ltd | Pinner | 2025 |
| 1VISIONART Ltd | Leeds | 2025 |
| 1W1L Ltd | Epsom | 2019 |
| 1WALL Limited | Blackpool | 2014 |
| 1WAY Food Service Ltd | London | 2020 |
| 1WAYCARS Limited | London | 2019 |
| 1WAYCREPS Limited | Bolton | 2024 |
| 1WAYSALAH Ltd | Nottingham | 2026 |
| 1WOA Ltd | London | 2026 |
| 1WPTECH Ltd | Thornton Heath | 2025 |
| 1XBLUE Ltd | London | 2020 |
| 1XMART Ltd | London | 2026 |
| 1Y Ltd | Uxbridge | 2024 |
| 1YNX Goalkeeping Ltd | Sholing | 2019 |
| 1ZAGENCY Ltd | London | 2025 |