| 1ST Step Consulting Ltd | London | 2023 |
| 1ST Step Management Services Limited | Clacton-On-Sea | 2005 |
| 1ST Step to Study Ltd | Stevenage | 2024 |
| 1ST Stop Accountancy and Tax Services Bristol Limited | London | 2016 |
| 1ST Stop Data Limited | Teddington | 1994 |
| 1ST Subsurface Oilfield Management Limited | Cults | 2013 |
| 1ST System Engineering Limited | Epsom | 2022 |
| 1ST Systems Engineering Ltd. | Epsom | 2005 |
| 1ST Talent Ltd | London | 2013 |
| 1ST Taxi Solutions Ltd | Fareham | 2011 |
| 1ST Translation Company Limited | Petts Wood | 1983 |
| 1ST UK Online Entertainment Ltd | Cardiff | 2017 |
| 1ST Ukimmigration Lawyers Ltd | Chatham | 2018 |
| 1ST Ukimmigration Lawyers-Dm Law Practice Ltd. | London | 2016 |
| 1ST Ukrainian's Business Ltd | Edinburgh | 2023 |
| 1ST Visa International Limited | London | 2022 |
| 1ST Waste Management Consultants Limited | Hertford | 1999 |
| 1ST Wheels Garage Ltd | Beverley | 2025 |
| 1ST4 Limited | Wylam | 2020 |
| 1ST4BOOKS Ltd | Wolverhampton | 2012 |
| 1STBUSINESSSOLUTIONS Limited | Coventry | 2011 |
| 1STCO Services UK Ltd | London | 2023 |
| 1STEP4FUTURE Ltd | London | 2025 |
| 1STEPAHEAD Global Services Ltd | London | 2020 |
| 1STFLEETCOMPLIANCE Ltd | Lincoln | 2025 |
| 1STINTHEATRE Limited | Doncaster | 2015 |
| 1STLAW Ltd | Redruth | 2023 |
| 1STNET Marketing Ltd | Loughborough | 2023 |
| 1STOPARCHITECTURAL Ltd | Bishop'S Stortford | 2023 |
| 1STOPSALES Limited | London | 2017 |
| 1STOPTRAVELSHOPUK Limited | Belfast | 2015 |
| 1STOPVAT UK Ltd | London | 2023 |
| 1STOPWEB Innovation Ltd | Beckenham | 2010 |
| 1STOPXBRL Limited | London | 2012 |
| 1SW Events London Ltd | London | 2018 |
| 1T - Structures Ltd | Middlesbrough | 2026 |
| 1T4 Holding Limited | Doncaster | 2017 |
| 1TABLE Limited | London | 2024 |
| 1TEN Marketing Ltd | London | 2021 |
| 1TL Ltd | Beaconsfield | 2018 |
| 1TO1 Wealth Limited | Uxbridge | 2013 |
| 1TO1DESIGNS Limited | Rugeley | 2022 |
| 1TRY Ltd | York | 2014 |
| 1TURNOAKPARK Limited | Bourne End | 2026 |
| 1U Consulting Limited | London | 2026 |
| 1UP Brand Ltd | Swindon | 2024 |
| 1UP Films Limited | Bristol | 2010 |
| 1UP PR Limited | Baldock | 2022 |
| 1UP Social Ltd | London | 2021 |
| 1UP Trade Limited | London | 2017 |
| 1UZB PLC | Londn | 2025 |
| 1V5 Ltd | London | 2023 |
| 1VERITAS Ltd | Sutton Coldfield | 2026 |
| 1X Design Ltd | London | 2025 |
| 1XINTERNET Limited | Macclesfield | 2025 |
| 1XK Ltd | London | 2026 |
| 1XL Limited | London | 2018 |
| 1YOUWANT Limited | West Sussex | 1998 |
| 1ZERO8 Real Estate Advisors Ltd | Harrow | 2023 |
| 2 & 8 Solutions Ltd | Romford | 2022 |
| 2 8 Instrument Solutions Ltd | Middlesbrough | 2025 |
| 2 a T Consulting Ltd | London | 2024 |
| 2 a T Limited | London | 2018 |
| 2 a TEE Ltd | High Wycombe | 2008 |
| 2 Albany Road Ealing Limited | London | 2008 |
| 2 Alexander Buildings Bath (Management) Limited | Bath | 1986 |
| 2 Alma Court Management Co. Limited | Scarborough | 1996 |
| 2 AM Management Company Limited | Rotherham | 2009 |
| 2 AM Trustee Limited | Rotherham | 2023 |
| 2 Aspire (UK) Ltd | Stafford | 2018 |
| 2 Ayayas Limited | Coulsdon | 2002 |
| 2 Balance Consulting Limited | Edinburgh | 2014 |
| 2 Balance Ltd | Reading | 2008 |
| 2 Bears Consulting Ltd | Newbury | 2014 |
| 2 Bedford Road (Management) Company Limited | London | 1996 |
| 2 Beechmore Road Limited | London | 2006 |
| 2 Billion Acres Limited | Upminster | 2016 |
| 2 Bishops Road Limited | London | 2016 |
| 2 Bonham Road Limited | Robertsbridge | 2014 |
| 2 Bridge the GAP Limited | Lincoln | 2004 |
| 2 Bridges Research & Marketing Consultancy Ltd | Manchester | 2021 |
| 2 Brothers Developers Ltd | Degenham | 2017 |
| 2 C OR NOT 2 C Limited | London | 2013 |
| 2 CAN Print Ltd | Stafford | 2019 |
| 2 Clifton Road (Llandudno) Limited | Llandudno | 2010 |
| 2 Consultants Ltd | Lowestoft | 2024 |
| 2 Counties Construction Ltd | Shrawley | 2007 |
| 2 Creighton Avenue Ltd | London | 2017 |
| 2 Croft Road (Management) Limited | Godalming | 1988 |
| 2 Degrees and Under Ltd | London | 2025 |
| 2 Degrees Infrastructure Ltd | Henley-In-Arden | 2021 |
| 2 Degrees Kelvin Ltd | Cardiff | 2019 |
| 2 Delta Engineering Limited | North Ferriby | 2024 |
| 2 Denning Road Limited | London | 1999 |
| 2 Eastbury Avenue Residents Limited | Harrow | 1999 |
| 2 Edburton Avenue Brighton Limited | East Sussex | 2003 |
| 2 Elder Avenue Management Limited | London | 2001 |
| 2 Enforce 2 Control Limited | Stanwell | 2015 |
| 2 Flags Visa Services Ltd | London | 2024 |
| 2 Flux Ltd | Edinburgh | 2011 |