| 7 Lotus Ltd | Hospitality | 2019 |
| 7 Rosary Gardens Limited | Professional & scientific | 2015 |
| 7 SF22 Limited | Administrative & support | 2020 |
| 7 Steel (Properties) Limited | Manufacturing | 2002 |
| 7 Steel (UK) Holdings Limited | Manufacturing | 2002 |
| 7 Steel (UK) Limited | Manufacturing | 2003 |
| 7 Steel Manufacturing (UK) Limited | Manufacturing | 2002 |
| 7 Steel Service (UK) Holdings Limited | Manufacturing | 2008 |
| 7 Steel Service (UK) Limited | Manufacturing | 1984 |
| 7 to 10 Food & Wine Ltd | Wholesale & retail | 2014 |
| 7 TY Consulting Limited | Professional & scientific | 2015 |
| 7/8 Duffryn Close Management Company Limited | Extraterritorial | 2013 |
| 7/8 Windsor Place Trustee Ltd | Real estate | 2011 |
| 70 Four Green Ltd | Agriculture & fishing | 2024 |
| 70,000 Thoughts Limited | Arts & recreation | 2008 |
| 70A Tudor Street Management Company Limited | Extraterritorial | 2010 |
| 72 TS Limited | Real estate | 2021 |
| 720 Records Ltd | Information & communication | 2020 |
| 73 Cowbridge Road East Limited | Households | 2012 |
| 73 Ninian Road Management Ltd | Real estate | 2022 |
| 73 Uverdale Road Ltd | Real estate | 2015 |
| 737 Challenge Limited | Administrative & support | 2010 |
| 74 Coburn Street Management Company Limited | Households | 2001 |
| 74 EP Freehold Ltd | Other services | 2013 |
| 74C EP Ltd | Other services | 2013 |
| 75 Connaught Road Limited | Households | 1993 |
| 75H Toy Life Limited | Wholesale & retail | 2025 |
| 76 Connaught Road Management Limited | Real estate | 2024 |
| 77 Wilshire Ltd | Hospitality | 2026 |
| 777 Security Ltd | Administrative & support | 2017 |
| 786 Kitchens Limited | Wholesale & retail | 2017 |
| 786 Properties (Cardiff) Ltd | Construction | 2017 |
| 788 Consulting Ltd | Other services | 2017 |
| 7B Group Ltd | Hospitality | 2018 |
| 7CAPITAL International Ltd | Professional & scientific | 2019 |
| 7HILL Designs Ltd | Professional & scientific | 2025 |
| 7HILLDESIGNLTD Ltd | Professional & scientific | 2026 |
| 7K FBA Limited | Professional & scientific | 2025 |
| 7S Film Co Ltd | Manufacturing | 2020 |
| 7SM Limited | Hospitality | 2021 |
| 7SYS Ltd | Wholesale & retail | 2024 |
| 8 Craigavon Road Ltd | Real estate | 2018 |
| 8 Eyes Ltd | Real estate | 2026 |
| 8 Park Road Ltd | Real estate | 2026 |
| 8 Peaches Ltd | Wholesale & retail | 2017 |
| 8 Prime Focus Advisory Limited | Other services | 2025 |
| 8 Victoria Park Road West Management Limited | Households | 2020 |
| 8&3 Gelt Limited | Real estate | 2016 |
| 80E Sava the Bookkeeper Ltd | Professional & scientific | 2021 |
| 81 Medical Ltd | Health & social care | 2020 |
| 81 Ninian Road Management Company Limited | Households | 2009 |
| 82 Baby Cottage Limited | Hospitality | 2024 |
| 82 Canada Ltd | Real estate | 2025 |
| 82 Claude Road Ltd | Households | 2021 |
| 82 Ninian Road Management Company Limited | Households | 2000 |
| 83 Cathedral Road Management Company Limited | Households | 2003 |
| 83 Shirley Road Management Company Limited | Households | 2023 |
| 83688178 Intl Ltd | Wholesale & retail | 2021 |
| 83MGMT Limited | Information & communication | 2024 |
| 84 Steps Limited | Information & communication | 2011 |
| 84 West Ltd | Hospitality | 2017 |
| 85 Yetholm Place Ltd | Real estate | 2019 |
| 85RC Freehold Ltd | Real estate | 2026 |
| 86 Cathedral Road RTM Company Limited | Households | 2007 |
| 86-90 PHS Ltd | Construction | 2021 |
| 87 Severn Road Management RTE Company Limited | Real estate | 2008 |
| 88 Marlborough Road Management Company Limited | Households | 2007 |
| 888 Top Shop Ltd | Wholesale & retail | 2025 |
| 89 Connaught Road, Cardiff Limited | Households | 2007 |
| 8910 Business Limited | Information & communication | 2019 |
| 8HAUS Ltd | Hospitality | 2019 |
| 8K Tech Ltd | Information & communication | 2024 |
| 8LENS* Ltd | Information & communication | 2025 |
| 8OFFICE Ltd | Professional & scientific | 2021 |
| 8SOFT Ltd | Information & communication | 2026 |
| 8UERTE Limited | Wholesale & retail | 2018 |
| 9 - 16 Petherton Mews RTM Company Limited | Households | 2024 |
| 9 Ninian Road Management Limited | Real estate | 2025 |
| 9 Waungron Road Management Limited | Professional & scientific | 2000 |
| 9,11,13,15 Pennant Crescent Management Company Limited | Households | 2004 |
| 90 Railway Street Limited | Hospitality | 2015 |
| 90N20 Ltd | Arts & recreation | 2019 |
| 91 Mackintosh Place Management Company Ltd | Households | 2023 |
| 91WORLD Ltd | Information & communication | 2025 |
| 95 Severn Grove (Cardiff) Limited | Households | 2006 |
| 95 Tewkesbury Street Management Company Limited | Households | 2006 |
| 95-101A Llanover Road Management Company Ltd | Households | 2019 |
| 95/105 Windermere Management Company Limited | Households | 2024 |
| 959 Performance Ltd | Professional & scientific | 2026 |
| 999CONSULTANCY Limited | Health & social care | 2015 |
| 9SEVENS Consulting Ltd | Administrative & support | 2016 |
| @DUCK13 Ltd | Other services | 2024 |
| @RK Music Services Limited | Education | 2016 |
| A & a (Cardiff) Ltd | Health & social care | 2023 |
| A & a Hair Stylists Limited | Other services | 2018 |
| A & a Management Services Limited | Households | 2017 |
| A & a Property Refurbishments Limited | Professional & scientific | 2005 |
| A & B Car Hire Ltd | Administrative & support | 2014 |
| A & B Coach Travel Limited | Transport & logistics | 2001 |
| A & B Security Services Ltd | Administrative & support | 2019 |