| 17053649 Limited | Information & communication | 2026 |
| 17053660 Limited | Information & communication | 2026 |
| 17213602 Ltd | Construction | 2026 |
| 18-24 Heol SYR Lewis Flat Management Company Limited | Households | 2012 |
| 180 Wellness Centres LLP | | 2016 |
| 182 Clive Street Management Limited | Households | 2020 |
| 18CENTS Ltd | Wholesale & retail | 2020 |
| 19 Bolsover Street Management Company Limited | Households | 2017 |
| 1907 Limited | Other services | 2019 |
| 196 Productions Limited | Information & communication | 1995 |
| 197 Cathedral Road Management Company Ltd | Households | 2024 |
| 1974 Health and Safety Consultancy Limited | Professional & scientific | 2021 |
| 1975 Hair Team Limited | Other services | 2024 |
| 1979 Films Ltd | Information & communication | 2015 |
| 198FOR Limited | Professional & scientific | 2017 |
| 19A Ltd | Financial services | 2018 |
| 19SIXTYSIX Limited | Real estate | 2017 |
| 19THIRTEEN Fresh Tastes Ltd | Hospitality | 2025 |
| 1A Limited | Transport & logistics | 2025 |
| 1CLICK 2GO Opportunity Investment Mortgage Bond Ltd | Financial services | 2021 |
| 1DRIVE Motors Ltd | Wholesale & retail | 2025 |
| 1DW Trading Limited | Hospitality | 2019 |
| 1E Systems Limited | Professional & scientific | 2014 |
| 1ENFORCEMENT Limited | Other services | 2024 |
| 1HUMANITY AI Limited | Information & communication | 2025 |
| 1IVE Bull Run Ltd | Arts & recreation | 2022 |
| 1LETA Limited | Real estate | 2017 |
| 1MAN Capital Holdings Ltd | Financial services | 2026 |
| 1MAN Capital Trading Limited | Wholesale & retail | 2026 |
| 1PHYSIOUK Limited | Health & social care | 2023 |
| 1ST 4 Logistics Ltd | Transport & logistics | 2021 |
| 1ST Alert UK Limited | Construction | 2003 |
| 1ST Asset Limited | Transport & logistics | 2025 |
| 1ST Business Marketing Ltd | Information & communication | 2025 |
| 1ST Call Carmasters Ltd | Wholesale & retail | 2023 |
| 1ST Call MOT & Service Centre Ltd | Wholesale & retail | 2007 |
| 1ST Call Property Services Ltd | Construction | 2019 |
| 1ST Call Solutions Ltd | Professional & scientific | 2019 |
| 1ST Choice Accident Repair Centre Limited | Wholesale & retail | 2002 |
| 1ST Choice Auto Body Group UK Ltd | Financial services | 2017 |
| 1ST Choice Auto Holdings Ltd | Financial services | 2026 |
| 1ST D'Zine Office Solutions Ltd | Administrative & support | 2020 |
| 1ST Fulfilment Ltd | Transport & logistics | 2019 |
| 1ST Grade Care Ltd | Health & social care | 2009 |
| 1ST Green Deal Ltd. | Administrative & support | 2012 |
| 1ST Impression (Wales) Limited | Manufacturing | 2007 |
| 1ST Life Consultancy Group Limited | Professional & scientific | 2020 |
| 1ST Platinum Chauffeurs Ltd | Transport & logistics | 2023 |
| 1ST Steer Driving School Ltd | Education | 2015 |
| 1ST Step to Claim Ltd | Financial services | 2024 |
| 1ST Stop MOT Cardiff Ltd | Wholesale & retail | 2018 |
| 1ST Stop Motor Group Ltd | Wholesale & retail | 2025 |
| 1ST UK Online Entertainment Ltd | Professional & scientific | 2017 |
| 1STCRACK Ltd | Hospitality | 2016 |
| 1SW London Limited | Administrative & support | 2010 |
| 1TRX Ltd | Construction | 2015 |
| 1V1 Basketball Viper League Limited | Education | 2025 |
| 2 Degrees Kelvin Ltd | Professional & scientific | 2019 |
| 2 H'S Trading Ltd | Wholesale & retail | 2011 |
| 2 LET 2 Ltd | Real estate | 2004 |
| 2 Real Enterprises Ltd | Wholesale & retail | 2019 |
| 2-4 FS Ltd | Real estate | 2024 |
| 2-SOLO CIC | Transport & logistics | 2019 |
| 20 Degrees Consulting Limited | Professional & scientific | 2013 |
| 20 LES Argonautes Limited | Extraterritorial | 2004 |
| 20 Wordsworth Avenue Management Company Limited | Real estate | 2013 |
| 20/20 Print & Copier Solutions Ltd | Wholesale & retail | 2013 |
| 2019 Ltd | Construction | 2018 |
| 2020 Property Management Limited | Real estate | 2020 |
| 2021 Onward Limited | Hospitality | 2024 |
| 20:20 Iconic Art Vision Ltd. | Wholesale & retail | 2017 |
| 21 Broad Court Management Limited | Real estate | 2014 |
| 21 Fitzhamon Embankment Company Limited | Households | 2005 |
| 21 Sevington Road Ltd | Real estate | 2018 |
| 211 Albany Road Limited | Households | 2023 |
| 21ST Century Healthcare Limited | Health & social care | 2012 |
| 22 Impact Ltd | Administrative & support | 2020 |
| 22 Management Solutions Ltd | Professional & scientific | 2026 |
| 22 Minny Street Limited | Hospitality | 2008 |
| 22 Ninian Road Management Co Limited | Hospitality | 2000 |
| 220 Interiors Ltd. | Construction | 2013 |
| 220 Watch Company Ltd | Manufacturing | 2018 |
| 220/220A Newport Road Management Company Limited | Households | 2017 |
| 2213 UK Holding Ltd | Financial services | 2020 |
| 223 Caerphilly Road Management Limited | Households | 2021 |
| 224 Newport Road Management Limited | Real estate | 2024 |
| 226 Management Company Limited | Real estate | 2004 |
| 228 Newport Road Cardiff Limited | Households | 1999 |
| 23 Fitzhamon CYF | Households | 2019 |
| 23 Homes Ltd | Real estate | 2019 |
| 2341CHURCH Limited | Real estate | 2022 |
| 24 Hours Tyres Cardiff Ltd | Manufacturing | 2025 |
| 24 Redpoll Ltd | Real estate | 2020 |
| 24-7 Competitions Ltd | Arts & recreation | 2026 |
| 24-7 Recruitment Ltd | Administrative & support | 2024 |
| 24-7 UK Medistore Limited Limited | Wholesale & retail | 2025 |
| 24/7 Cars Airport Transfer Ltd | Transport & logistics | 2023 |
| 24/7 Global Business Support Limited | Administrative & support | 2019 |
| 24/7 Homewares Ltd | Wholesale & retail | 2023 |
| 24/7 Plumbing Heating Electrical Limited | Construction | 2017 |