| 627 Clydach Road Ltd | Real estate | 2017 |
| 629 Clydach Road Ltd | Construction | 2017 |
| 64 Limited | Other services | 2016 |
| 65 Church Road Limited | Households | 2023 |
| 65 Eversley RTM Company Limited | Households | 2021 |
| 660 Ltd | Wholesale & retail | 2018 |
| 68 Cardiff Road (Residential Management) Limited | Real estate | 2015 |
| 680 Management Company Limited | Households | 2002 |
| 684A and 684A Mumbles Road Management Company Limited | Real estate | 2022 |
| 7 Day Windows Limited | Construction | 2020 |
| 7 Wonders Media Ltd | Information & communication | 2025 |
| 724 Mumbles Road Swansea Residents Association Limited | Professional & scientific | 1996 |
| 7710 Ltd | Real estate | 2021 |
| 786 Interiors Ltd | Wholesale & retail | 2020 |
| 7FORWARD Limited | Administrative & support | 2017 |
| 8020 Engineering Limited | Professional & scientific | 2009 |
| 80’S Heaven Limited | Information & communication | 2025 |
| 85 Ltd | Real estate | 2012 |
| 88 Swansea Limited | Wholesale & retail | 2025 |
| 888-GROUP Limited | Administrative & support | 2009 |
| 8EMPLOY Ltd | Information & communication | 2026 |
| 8TB Ltd | Real estate | 2020 |
| 92 Walter Road (Maintenance) Limited | Real estate | 2007 |
| 92 Woodfield Street Barber Ltd | Other services | 2022 |
| 98 Bryn Road RTM Company Limited | Households | 2020 |
| 999 Spring Flowers Bloom Ltd | Hospitality | 2022 |
| 999 Training Services Limited | Education | 2022 |
| 9TEA Limited | Hospitality | 2017 |
| @ Work Wales Ltd | Professional & scientific | 2007 |
| A & C Denney Transport Services Ltd | Transport & logistics | 2018 |
| A & D Asset Management Ltd | Real estate | 2021 |
| A & D Direct Property Holdings Limited | Real estate | 2021 |
| A & D Recruitment Ltd | Administrative & support | 2012 |
| A & H Travel Ltd | Other services | 2017 |
| A & J Aesthetics Your Way Ltd | Other services | 2025 |
| A & K Bricklaying Services Ltd | Construction | 2019 |
| A & L Accountancy Limited | Professional & scientific | 2004 |
| A & L Bricklaying Services Ltd | Construction | 2018 |
| A & L Morris Plastering & Building Limited | Construction | 2022 |
| A & L Payroll Ltd | Administrative & support | 2024 |
| A & M Taxis and Minibuses Limited | Transport & logistics | 2005 |
| A & O Removals Ltd | Transport & logistics | 2025 |
| A & S Bricklaying Contractors Ltd | Construction | 2002 |
| A & S Development Services Limited | Real estate | 2004 |
| A & W Agricultural Services Limited | Wholesale & retail | 2015 |
| A 2 Z Tyre Recycling Ltd | Water & waste | 2021 |
| A a Abbey Roofing & Building Contractors Ltd | Construction | 2011 |
| A a Late Shop Limited | Wholesale & retail | 2013 |
| A and P Electrical Supplies Limited | Wholesale & retail | 2002 |
| A and T Petersen Ltd | Wholesale & retail | 2007 |
| A B Plastics Ltd | Extraterritorial | 2011 |
| A B Swansea Limited | Professional & scientific | 2013 |
| A Bowl of Tiramisu Ltd | Arts & recreation | 2025 |
| A Bright Solution UK Limited | Construction | 2012 |
| A D Carpentry & Joinery Ltd | Construction | 2019 |
| A D Scaffolding (Swansea) Ltd | Construction | 2011 |
| A Davies Knee Surgery Limited | Health & social care | 2026 |
| A FEW People Ltd | Information & communication | 2023 |
| A Fine Line Limited | Construction | 2004 |
| A G Bennett Ltd | Professional & scientific | 2019 |
| A Golden Key Property Limited | Real estate | 2026 |
| A GP for YOU Ltd | Health & social care | 2013 |
| A H I Trading Ltd | Construction | 2015 |
| A Harry Locksmith Ltd | Manufacturing | 2024 |
| A J & C J Butler Properties Ltd | Real estate | 2022 |
| A J Platinum Groundworks Ltd | Construction | 2025 |
| A J Powell Mobile Welding Ltd | Water & waste | 2021 |
| A J Services (Swansea) Ltd. | Construction | 2003 |
| A J Thomas Transport Ltd | Transport & logistics | 2023 |
| A Kaur Ltd | Health & social care | 2024 |
| A Listed Home Improvements Ltd | Construction | 2019 |
| A Llewellyn J Limited | Professional & scientific | 1999 |
| A M Evans & Co Ltd | Construction | 2014 |
| A M J Electrical Services Ltd | Manufacturing | 2015 |
| A M Willett Property Renovations Limited | Construction | 2020 |
| A Morgan & Co Limited | Professional & scientific | 2004 |
| A Morgan & Co Properties Limited | Real estate | 2019 |
| A One Home Improvements (South West) Limited | Administrative & support | 2011 |
| A One Tyres LP | | 2005 |
| A One Window Systems Ltd | Construction | 2015 |
| A P Architecture and Planning Ltd | Construction | 2010 |
| A P Logistics Limited | Information & communication | 1983 |
| A Plus Plumbing & Heating Ltd | Construction | 2019 |
| A Privacy Differential Company Ltd | Professional & scientific | 2024 |
| A R Autos Limited | Manufacturing | 2003 |
| A R C Academy UK Limited | Other services | 2011 |
| A R Davies Limited | Construction | 2011 |
| A Rated Home Improvements Limited | Construction | 2010 |
| A Rees Holdings Limited | Financial services | 2024 |
| A S & E Contracts Ltd | Construction | 2014 |
| A S P Fabrications and Holdings Ltd | Financial services | 2025 |
| A Sisters Property Ltd | Real estate | 2022 |
| A Skip Hire Limited | Administrative & support | 2006 |
| A Star (Mini) Travel Limited | Administrative & support | 2014 |
| A Star Repair Ltd | Wholesale & retail | 2026 |
| A T Jones Consultancy Ltd | Professional & scientific | 2018 |
| A T Plumbing Limited | Other services | 2012 |
| A Touch of Pink Beauty Boutique Limited | Other services | 2014 |
| A&A Fish Bar Limited | Hospitality | 2026 |
| A&A Scaffolding Specialists Ltd | Construction | 2026 |