| 24/7 Premium Cleaning Services Ltd | Administrative & support | 2019 |
| 240 Consulting Limited | Administrative & support | 2015 |
| 240 Whitchurch Road Management Company Ltd | Hospitality | 2010 |
| 247 Elevate Construction Ltd | Construction | 2025 |
| 247 Excellent Quality Care Ltd | Health & social care | 2019 |
| 247 Secure Installations Ltd. | Administrative & support | 2020 |
| 247WATCHESBEST Limited | Wholesale & retail | 2024 |
| 24GLO Ltd | Wholesale & retail | 2018 |
| 24H Online Services Ltd | Professional & scientific | 2024 |
| 24HR Plumbing Ltd | Construction | 2025 |
| 24K Jewellers Ltd | Wholesale & retail | 2016 |
| 25-48 Richmond Court Residents Association Limited | Real estate | 2005 |
| 250 BH Ltd | Real estate | 2024 |
| 250 WPR Ltd | Construction | 2019 |
| 26 Camden High Street Limited | Real estate | 2019 |
| 26 Clive Street Limited | Households | 2021 |
| 26 Conway Road Management Company Ltd | Real estate | 2018 |
| 26 Ninian Road Ltd | Households | 2019 |
| 26 Ovington Management Company Ltd | Households | 2016 |
| 26-31 Pipkin Close RTM Company Limited | Households | 2008 |
| 260387 Limited | Administrative & support | 2021 |
| 26041444 | Arts & recreation | 2015 |
| 26TH April (UK) Limited | Real estate | 1999 |
| 27 Fairleigh Road Management Company Ltd | Real estate | 2008 |
| 27TH Generation Production Ltd | Wholesale & retail | 2020 |
| 28 Across Ltd | Information & communication | 2024 |
| 28 DS Limited | Real estate | 2021 |
| 28 Enterprises Ltd | Extraterritorial | 2018 |
| 285 & 285A Cyncoed Road Management Limited | Real estate | 2007 |
| 286-288 Property Management Ltd | Households | 2017 |
| 28A High Street RTM Company Ltd | Households | 2015 |
| 29 Beauchamp Street (Cardiff) Limited | Households | 2018 |
| 29 Group Limited | Wholesale & retail | 2020 |
| 29 Rectory Road Cardiff Ltd | Households | 2015 |
| 291 Cowbridge Road East Management Limited | | 2012 |
| 293 Albany Road Management Company Ltd | Households | 2012 |
| 2ABS Holdings Ltd | Professional & scientific | 2021 |
| 2BUNNYENT Ltd | Wholesale & retail | 2018 |
| 2BUY2 EV Charging Limited | Transport & logistics | 2022 |
| 2BUY2 Green Limited | Transport & logistics | 2022 |
| 2BUY2 Group Limited | Financial services | 2022 |
| 2BUY2.COM Limited | Professional & scientific | 2009 |
| 2C2NV Eyewear Limited | Wholesale & retail | 2015 |
| 2C418 Ltd | Information & communication | 2023 |
| 2CAN Productions Limited | Arts & recreation | 2016 |
| 2D CNC Machinery Limited | Manufacturing | 2009 |
| 2DK Group Limited | Financial services | 2023 |
| 2DK Holdings Ltd | Financial services | 2023 |
| 2G Developments Ltd | Real estate | 2021 |
| 2HUME Consulting Ltd | Financial services | 2015 |
| 2K Construct Limited | Construction | 2015 |
| 2NBW Investments Limited | Real estate | 2019 |
| 2ND Time Around House Clearance Specialists Limited | Transport & logistics | 2023 |
| 2ND Week Ltd | Professional & scientific | 2021 |
| 2S Properties Ltd | Real estate | 2020 |
| 2SSAM Ltd | Hospitality | 2026 |
| 2UOD Ltd | Administrative & support | 2016 |
| 2WENTY 5IVE Limited | Administrative & support | 2024 |
| 2WIN AGE Productions Ltd | Information & communication | 2014 |
| 3 Birch House Ltd | Professional & scientific | 2000 |
| 3 Consult Limited | Construction | 2022 |
| 3 Elite Ltd | Other services | 2018 |
| 3 Nations ENT Ltd | Hospitality | 2025 |
| 3 PEN CEI Limited | Real estate | 2020 |
| 3 Point Surveys Limited | Professional & scientific | 2011 |
| 3 Source Ltd | Wholesale & retail | 2018 |
| 3 Star Enterprises T/A 3SE Ltd | Transport & logistics | 2019 |
| 3 Trojans Developments Ltd | Real estate | 2023 |
| 3 Trojans Limited | Construction | 2022 |
| 30 Pen-Y-Lan Road RTM Company Limited | Households | 2012 |
| 303 Electrical Limited | Construction | 2018 |
| 306 Western Avenue Limited | Real estate | 2022 |
| 308 Heathwood Road (Management) Company Limited | Households | 1988 |
| 31 Limited | Information & communication | 2009 |
| 310NEX Outdoor Media Limited | Manufacturing | 2018 |
| 313 Wealth Management Limited | Professional & scientific | 2019 |
| 313SEC Ltd | Information & communication | 2024 |
| 316 Home Cafe Limited | Households | 2013 |
| 31EAST Group Ltd | Information & communication | 2025 |
| 321 HR Ltd | Administrative & support | 2025 |
| 333 Newport Road Management Company Limited | Households | 2011 |
| 339 Foods Limited | Wholesale & retail | 2018 |
| 33MEGA Ltd | Information & communication | 2026 |
| 33WP Ltd | Hospitality | 2021 |
| 34 Kings Road Limited | Real estate | 2018 |
| 34 Lavender Lane Ltd | Real estate | 2014 |
| 34 Teal Street RTM Company Limited | Households | 2014 |
| 34-36 Monthermer Property Management Ltd. | Administrative & support | 2013 |
| 344 Consulting Ltd | Professional & scientific | 2020 |
| 347 Lynx Ltd | Administrative & support | 2017 |
| 3473 Safety Solutions Limited | Administrative & support | 2012 |
| 34IST Ltd | Wholesale & retail | 2023 |
| 35 Howard Gardens Management Co Ltd | Real estate | 2021 |
| 35 Worsley Close Ltd | Real estate | 2018 |
| 350 Whitchurch Road Limited | Households | 2003 |
| 36 Neville Street Cardiff Management Limited | Administrative & support | 2002 |
| 36 Shrewsbury Limited | Real estate | 2013 |
| 360 Accountancy Solutions Limited | Professional & scientific | 2011 |
| 360 AV Ltd | Information & communication | 2000 |
| 360 Business Management Ltd | Professional & scientific | 2023 |