| . Charina Maldia Company Limited | Health & social care | 2021 |
| .THE Escape Game Ltd | Arts & recreation | 2017 |
| 1 Cwrt YR Aeron Limited | Households | 2025 |
| 1 Denver Road Ltd | Real estate | 2017 |
| 1 Wind Street Ltd | Real estate | 2025 |
| 10 Aberdy Limited | Real estate | 2017 |
| 100 Days Ltd | Wholesale & retail | 2016 |
| 100 Swansea UK Ltd | Real estate | 2019 |
| 100% Events Ltd | Hospitality | 2021 |
| 100% Weekend Events Ltd | Hospitality | 2025 |
| 108 Best Food Ltd | Hospitality | 2026 |
| 11 Heol Gwanwyn Ltd | Real estate | 2018 |
| 11021998 Ltd | Construction | 2026 |
| 11ELEVEN Holdings Ltd | Financial services | 2025 |
| 12-18 Gabalfa Road Management Company Limited | Households | 1990 |
| 120400 Ltd | Arts & recreation | 2017 |
| 123 Clydach Road Ltd | Real estate | 2026 |
| 13CLAN Ltd | Wholesale & retail | 2026 |
| 14 Stars Europe Ltd | Administrative & support | 2025 |
| 1415 Limited | Wholesale & retail | 2013 |
| 15 Burrows Ltd | Real estate | 2025 |
| 15 Parc Road Ltd | Real estate | 2018 |
| 17 Kenwyn Limited | Households | 2008 |
| 17 Oaklands Terrace Limited | Households | 2025 |
| 179 Coffee Limited | Hospitality | 2026 |
| 179 Fitness Limited | Arts & recreation | 2022 |
| 1983 Estate Agents Ltd | Administrative & support | 2019 |
| 1S Capital Group Ltd | Construction | 2021 |
| 1ST Cars Pontarddulais Limited | Wholesale & retail | 2025 |
| 1ST Choice Education Consultancy Ltd | Education | 2013 |
| 1ST Stop Property Services Limited | Administrative & support | 2015 |
| 1ST Stop Scrap Recycling Ltd | Wholesale & retail | 2020 |
| 2 RG Ltd | Real estate | 2005 |
| 2014 (South Wales) Limited | Other services | 2018 |
| 2020 Accounting Ltd | Professional & scientific | 2020 |
| 2020 Assist Ltd | Administrative & support | 2019 |
| 2020 Supplies Ltd | Wholesale & retail | 2020 |
| 205 Wendover Road Ltd | Households | 2025 |
| 20A Ltd | Real estate | 2021 |
| 21 Aberdy Limited | Real estate | 2017 |
| 2110 Limited | Real estate | 2025 |
| 222 Developments Limited | Construction | 2011 |
| 24-30 Gabalfa Road Management Company Limited | Real estate | 1991 |
| 24/7 Elaine's Minitravel Ltd | Administrative & support | 2017 |
| 25081983 Ltd | Hospitality | 2025 |
| 2728 Holdings Limited | Financial services | 2021 |
| 28 Gwydr Crescent Management Limited | Households | 2007 |
| 29 Maes Y Gollen Ltd | Real estate | 2026 |
| 2B Enterprising Limited | Education | 2016 |
| 2MR Property Ltd | Construction | 2026 |
| 2ND Hand Plant Ltd | Information & communication | 2001 |
| 2ND Time Around Productions C.I.C. | Information & communication | 2025 |
| 2OTH Ltd | Real estate | 2020 |
| 2WENTY 2 Ltd | Households | 2024 |
| 2ZEE'S Property Management Ltd | Real estate | 2025 |
| 3 Acorns Management Limited | Households | 2015 |
| 3 AH Ltd | Wholesale & retail | 2025 |
| 3 Cliffs Vodka Ltd | Wholesale & retail | 2024 |
| 3 Compasses (Clydach) Ltd | Hospitality | 2022 |
| 3 PDC Limited | Construction | 2006 |
| 30 Uplands Crescent Limited | Financial services | 2020 |
| 315 Neath Road Ltd | Real estate | 2018 |
| 32-42 (Evens) Trinity Close Limited | Households | 2024 |
| 34/36 Eaton Crescent Management Co. Ltd. | Real estate | 2011 |
| 35 Bridge Street Ltd | Real estate | 2011 |
| 360 Human Ltd | Health & social care | 2025 |
| 360 Wellbeing LLP | | 2026 |
| 360MILIEU Creatives Ltd | Manufacturing | 2025 |
| 37-43 Queen's Road Management Company Limited | Real estate | 1988 |
| 38-44 Hendy Close Property Management Company Limited | Households | 2005 |
| 39 Rotherslade Road Management Company Limited | Households | 2012 |
| 3D Tool Design Ltd | Professional & scientific | 2016 |
| 3D-BGS (UK) Ltd | Manufacturing | 2018 |
| 3D360TOUR Limited | Professional & scientific | 2018 |
| 3DFLO Limited | Wholesale & retail | 2025 |
| 3DW (Print Services) Ltd | Extraterritorial | 2016 |
| 3H Joinery Limited | Manufacturing | 2026 |
| 3HREE 65 Services Ltd | Construction | 2017 |
| 3RD Planet Solutions Limited | Information & communication | 1997 |
| 3STARS&SUN Limited | Health & social care | 2026 |
| 4 Elms Property Ltd | Real estate | 2018 |
| 4 ST Albans RD Management Company Ltd | Professional & scientific | 2021 |
| 4015 Lighting & Design Limited | Information & communication | 2015 |
| 42 Mumbles Road Ltd. | Hospitality | 2018 |
| 4CARS.UK Ltd | Wholesale & retail | 2025 |
| 4CHILDREN2ENJOY Ltd | Wholesale & retail | 2004 |
| 4D Softech Limited | Information & communication | 2025 |
| 4G Accountancy Limited | Professional & scientific | 2024 |
| 4NAVODAYA Limited | Wholesale & retail | 2025 |
| 4THEREGION CIC | Other services | 2018 |
| 5 Cwmdonkin Drive Limited | Arts & recreation | 2005 |
| 5 Edward Street Ltd | Construction | 2019 |
| 5 Quarters Property Ltd | Real estate | 2017 |
| 5 Star Super Store Ltd | Wholesale & retail | 2020 |
| 5,6,7 & 8 Byng Morris Close Management Company Limited | Households | 2004 |
| 5103 Ltd | Construction | 2014 |
| 6 Energy Limited | Construction | 2026 |
| 6 High Street Holdings Ltd | Construction | 2019 |
| 601 Industries Ltd | Manufacturing | 2021 |
| 623 Limited | Real estate | 2020 |