| Draig Plumbing & Heating Ltd | Other services | 2020 |
| Dream House Construct Ltd | Real estate | 2017 |
| Driven Image Limited | Wholesale & retail | 2025 |
| DRS Groundworks Limited | Construction | 2005 |
| Duffryn Properties Limited | Real estate | 2002 |
| Dynamic Plumbing Solutions Limited | Construction | 2019 |
| Eco Dustless Blasting Limited | Agriculture & fishing | 2018 |
| Ed's Way Ltd | Construction | 2024 |
| Edwards & Ross Pallets Limited | Wholesale & retail | 2005 |
| Embedded Leadership Limited | Professional & scientific | 2026 |
| Emporium Snooker Club Limited | Hospitality | 2020 |
| Endless Lashes Limited | Other services | 2022 |
| Enforcement Solutions UK Ltd | Other services | 2019 |
| ETU Cocker Ltd | Other services | 2020 |
| Euro Secure Storage Limited | Transport & logistics | 2010 |
| Express 328 Limited | Hospitality | 2023 |
| Ezhil & Co Limited | Wholesale & retail | 2023 |
| F&S Transformers Ltd | Manufacturing | 2014 |
| Fairwater Fish Bar Limited | Hospitality | 2004 |
| Favani Foods Ltd | Hospitality | 2019 |
| Fencing & Decking Supplies Limited | Wholesale & retail | 2014 |
| Fernbank HR Ltd | Administrative & support | 2024 |
| Ffynonau Duon Holdings Limited | Administrative & support | 2007 |
| Ffynonau Duon Mines Limited | Mining & quarrying | 1971 |
| Fire Door Safe Ltd | Public administration | 2026 |
| Fire Mist Global Limited | Wholesale & retail | 2022 |
| Fire Mist Solutions Limited | Wholesale & retail | 2024 |
| Fireflyz Limited | Hospitality | 2017 |
| Fitfluence Ltd | Wholesale & retail | 2026 |
| Five Star (Wales) Limited | Manufacturing | 2007 |
| Fooks & Co 2018 Ltd | Professional & scientific | 2018 |
| Fooks Taxation Services Limited | Financial services | 2011 |
| Footprint Promotions Ltd | Manufacturing | 2022 |
| FOR Food Limited | Extraterritorial | 2014 |
| Forever Measure Limited | Manufacturing | 2026 |
| Front of House Productions Ltd | Arts & recreation | 2018 |
| FWD Foods Ltd | Hospitality | 2024 |
| G and C Assets Ltd | Real estate | 2023 |
| G R Jones Brickwork Limited | Construction | 2016 |
| G W Scaffolding Ltd | Construction | 2024 |
| Gardd Ltd | Wholesale & retail | 2020 |
| Garden Revive Ltd | Administrative & support | 2025 |
| GAS Elite Services Ltd | Construction | 2025 |
| Geetec Auto Ltd | Wholesale & retail | 2022 |
| Generational Property Limited | Real estate | 2026 |
| GET Feral Limited | Other services | 2019 |
| Gilfach Carwash Ltd | Administrative & support | 2024 |
| Glamorgan Power Company Limited | Mining & quarrying | 1993 |
| Glanant Holdings Ltd | Real estate | 2026 |
| Gleadwell Homes Limited | Real estate | 2006 |
| Going Places Travel Ltd | Administrative & support | 2023 |
| Golden Car Wash Bargoed Ltd | Administrative & support | 2022 |
| Greenerwals Limited | Wholesale & retail | 2025 |
| Gwynvo Developments Ltd | Real estate | 2005 |
| Hanbury Court Residential Ltd | Real estate | 2018 |
| Hanbury Ltd | Hospitality | 2022 |
| Happy Nails HH Ltd | Other services | 2026 |
| Harmony & Dapper Ltd | Manufacturing | 2025 |
| Headquarters SW Ltd | Other services | 2025 |
| Honey Dots Ltd | Manufacturing | 2021 |
| Hong Kong Fish Bar Limited | Extraterritorial | 2005 |
| Hot Rads UK Ltd | Construction | 2025 |
| Howells Transport Consulting Services Ltd | Professional & scientific | 2020 |
| Howies Flooring Limited | Construction | 2019 |
| HS Clothes Ltd | Wholesale & retail | 2025 |
| Hubu Accountants Limited | Professional & scientific | 2008 |
| IAN Craig Williams Limited | Construction | 2015 |
| IJL GAS Services Ltd | Construction | 2023 |
| Invictus Stores Ltd | Wholesale & retail | 2025 |
| J G K Property Development Ltd | Real estate | 2024 |
| J M Price School of Mathematics Ltd | Education | 2022 |
| J.C.R Rigging Ltd | Construction | 2023 |
| J4 Consulting Ltd | Professional & scientific | 2025 |
| JAX #1 Limited | Hospitality | 2015 |
| JCR Tucker Properties Limited | Real estate | 2025 |
| JD Doggos Ltd | Other services | 2024 |
| JDB Property Partners Ltd | Real estate | 2026 |
| JJP Electrical Services Ltd | Construction | 2021 |
| JK Carpentry and General Building Limited | Construction | 2024 |
| JK Properties and Buildings Ltd | Real estate | 2023 |
| JLS & Co Accountants Limited | Professional & scientific | 2007 |
| JM Gym Fittness CIC | Arts & recreation | 2024 |
| Jonik Properties and Developments Limited | Real estate | 2024 |
| JR Decorating Ltd | Construction | 2026 |
| JX4 Consulting Ltd | Professional & scientific | 2023 |
| K'S GAS Plumbing and Heating Limited | Construction | 2026 |
| Kacar Health Care Ltd | Health & social care | 2020 |
| Kaytom Construction Ltd | Construction | 2025 |
| KEV & Co Tyres Ltd | Wholesale & retail | 2024 |
| Kfalconry Ltd | Agriculture & fishing | 2026 |
| Khan(Abr) Ltd | Hospitality | 2025 |
| KRF Trades Limited | Financial services | 2026 |
| KRJ Properties Ltd | Real estate | 2022 |
| Kurd Style Barber (Wales UK) Ltd | Other services | 2024 |
| Laabai Ltd | Wholesale & retail | 2018 |
| Ladybirds Childcare Ltd | Health & social care | 2024 |
| Laines Group Ltd | Construction | 2024 |
| Lakeside View Campsite Ltd | Hospitality | 2026 |
| Lawaa Limited | Wholesale & retail | 2023 |
| Layzo Limited | Hospitality | 2019 |