| Jess’S Tatts Ltd | Other services | 2025 |
| Jewills Properties Ltd | Real estate | 2025 |
| John Vincent Surveys Limited | Professional & scientific | 1991 |
| Joli & Johnny Ltd | Wholesale & retail | 2017 |
| Jones Mechanical Engineering Ltd | Construction | 2025 |
| JT Renovations Ltd | Construction | 2026 |
| Kazi Operations Ltd | Hospitality | 2022 |
| KC Ro-Development Ltd | Information & communication | 2025 |
| KE Maintenance and Construction Ltd | Administrative & support | 2025 |
| Kellysclothes Ltd | Wholesale & retail | 2025 |
| KL1 Carpentry & Kitchens Ltd | Manufacturing | 2026 |
| KS Electrical Services Ltd | Construction | 2022 |
| KTK Developments Ltd | Real estate | 2022 |
| L&G Concrete Flooring Group Limited | Construction | 2025 |
| Lamisa Ltd | Hospitality | 2018 |
| Lashes by Kiah Ltd | Wholesale & retail | 2025 |
| Leigh Thomas Commercials Ltd | Wholesale & retail | 2024 |
| Lily PAD Films Limited | Information & communication | 2009 |
| Lionstone Group Ltd | Construction | 2025 |
| Little Orchard Childcare Ltd | Health & social care | 2018 |
| Llysworney Garage Limited | Wholesale & retail | 1965 |
| LMR Carpentry Ltd | Construction | 2024 |
| Lucy Beth Cosmetics Ltd | Other services | 2017 |
| Lupi Foods Ltd | Hospitality | 2026 |
| M & L Convenience Store Ltd | Wholesale & retail | 2003 |
| M&T Solutions Ltd | Manufacturing | 2026 |
| Marc. Evans Scaffolding Limited | Construction | 2003 |
| Marmaris 12 Ltd | Hospitality | 2025 |
| Masbha Property Services Ltd | Real estate | 2025 |
| MAX Fire Services Ltd | Manufacturing | 2018 |
| Mhbfashions CYF | Wholesale & retail | 2025 |
| Michael Hitt Financial Planning Ltd | Professional & scientific | 2020 |
| Mitchinson Lawthom Ltd | Real estate | 2025 |
| MN Shrewsbury Ltd | Wholesale & retail | 2025 |
| MOO Cheesecake Limited | Wholesale & retail | 2024 |
| Morgan Hugh Bevan Limited | Wholesale & retail | 2025 |
| MRK Construction Ltd | Construction | 2013 |
| My BAD Ltd | Professional & scientific | 2024 |
| New Beginnings (Rhondda) Limited | Education | 2008 |
| New Valley Tandoori Limited | Hospitality | 2004 |
| Next Level Sports and Education Ltd | Education | 2023 |
| NRG Centre Ltd | Construction | 2016 |
| NVT Estates Ltd | Real estate | 2017 |
| Oak Realty Investments Ltd | Real estate | 2025 |
| OGT Building Group Limited | Construction | 2024 |
| OGT Group Limited | Real estate | 2025 |
| OGT Property Group Limited | Real estate | 2024 |
| OMC Mechanical Engineering Ltd | Professional & scientific | 2026 |
| Orchard Properties (South Wales) Limited | Real estate | 2022 |
| Owenp Properties Ltd | Real estate | 2024 |
| OXYGEN8 Clothing Ltd | Wholesale & retail | 2025 |
| P J Hodder Construction Ltd | Construction | 2016 |
| P&G Sons Ltd | Wholesale & retail | 2024 |
| Perrie’S Pendine Holiday Home Ltd | Hospitality | 2025 |
| Peter Fennell Upvc Specialist Limited | Construction | 2008 |
| Phantom Assets Ltd | Real estate | 2024 |
| Phantom Finance Ltd | Information & communication | 2025 |
| Phoenix Arts Ltd | Arts & recreation | 2022 |
| PM Heating & Plumbing Ltd | Extraterritorial | 2021 |
| Priceless Health and Fitness Limited | Arts & recreation | 2016 |
| Primepay Payroll UK Ltd | Professional & scientific | 2026 |
| Proos Roofing Merchants Limited | Construction | 2024 |
| Pulsepoint Training Solutions Ltd | Education | 2025 |
| QC Associates Limited | Professional & scientific | 2009 |
| R D Engineering Ltd | Professional & scientific | 2024 |
| Rafa Motors Ltd | Wholesale & retail | 2023 |
| RB Protection and Design Ltd | Manufacturing | 2025 |
| Recliners Holdings Limited | Administrative & support | 2019 |
| Reerac Ltd | Information & communication | 2022 |
| Rhondda Escape Rooms Limited | Arts & recreation | 2023 |
| Rohat Ltd | Other services | 2023 |
| Roots Flowers by Jess Limited | Wholesale & retail | 2024 |
| Rossco Solutions Ltd | Construction | 2021 |
| S4U54GE Ventures Ltd. | Wholesale & retail | 2024 |
| Sammy-Jo Ltd | Wholesale & retail | 2023 |
| Sandhu Convenience Ltd | Wholesale & retail | 2024 |
| Sandhu Stores Limited | Wholesale & retail | 2016 |
| Sheets by SHE Limited | Information & communication | 2024 |
| Sign & Graphics Services Limited | Administrative & support | 2023 |
| SJB Contractors Limited | Construction | 2005 |
| SJN Trading 2024 Ltd | Wholesale & retail | 2024 |
| Smokies Holdings Limited | Hospitality | 2024 |
| Sprayon Agricultural Products Limited | Manufacturing | 1977 |
| Studunn & Co Hospitality Ltd | Other services | 2025 |
| Sylfaen Holdings Ltd | Professional & scientific | 2026 |
| Symmons Aviation Services Ltd | Manufacturing | 2025 |
| Temple of Abiyr Ltd | Wholesale & retail | 2023 |
| Teulu Salon Ltd | Other services | 2020 |
| TFC Home Improvements Ltd | Real estate | 2026 |
| TG Homes Ltd | Real estate | 2025 |
| TGG Solutions Ltd | Energy | 2015 |
| Thatchers Independent Trading Ltd | Construction | 2025 |
| THE Calorie Cook Ltd | Hospitality | 2024 |
| THE Mews Building Ltd | Real estate | 2025 |
| THE Rhondda Roofing Company Limited | Construction | 2025 |
| THE Wall Doctor Limited | Construction | 2024 |
| Theva Property Ltd | Real estate | 2025 |
| Thorntons Property Services Ltd | Real estate | 2009 |
| Trident Facilities Group Ltd | Administrative & support | 2026 |
| Trident Security Ltd | Financial services | 2023 |