| Esamali Ltd. | Health & social care | 2024 |
| Eurom (European Marketing) Limited | Information & communication | 1991 |
| Fadestationz Ltd | Other services | 2024 |
| Fenton Design Ltd | Professional & scientific | 2020 |
| Fernhill & Blaenrhondda Miners' Social Club Limited | Hospitality | 2002 |
| Fernhill Valley Farm Ltd | Agriculture & fishing | 2020 |
| First Class Barber Treorchy Ltd | Other services | 2024 |
| Fisher Insure Services Ltd | Financial services | 2022 |
| Flowers by Kirsty Ltd | Wholesale & retail | 2017 |
| FN Estate Ltd | Real estate | 2023 |
| Frances Jude Homes Limited | Real estate | 2026 |
| Future Golf Ventures Limited | Arts & recreation | 2016 |
| G Richards Builders Ltd | Construction | 2014 |
| GA Security Limited | Administrative & support | 2012 |
| Geraint Thomas Monkton Limited | Construction | 2016 |
| GHS 2019 Ltd | Professional & scientific | 2018 |
| Gilly Carpentry Limited | Construction | 2019 |
| Ginger Panda Chinese Ltd | Hospitality | 2025 |
| Ginger Panda Treorchy Ltd | Hospitality | 2023 |
| Ginger Panda Wales Limited | Hospitality | 2024 |
| Goated Group Ltd | Information & communication | 2025 |
| Golau Laser Engraving Ltd | Wholesale & retail | 2024 |
| Good Fundraisers Ltd | Professional & scientific | 2018 |
| Goody Good One Limited | Real estate | 2004 |
| Graceton Advisory Limited | Professional & scientific | 2025 |
| H. Hunt & Sons Ltd. | Construction | 1994 |
| HAF House Tanning Studio Ltd | Other services | 2026 |
| Hampton Sales & Marketing Ltd | Wholesale & retail | 2024 |
| Hamsard One Thousand and Sixty Nine Limited | Manufacturing | 1997 |
| Haoyung Ltd | Hospitality | 2025 |
| Heritage Tile Restoration Ltd | Construction | 2021 |
| Highstreet Media Group Ltd | Professional & scientific | 2017 |
| Hitt Homes Ltd | Real estate | 2025 |
| HLM Homes Limited | Real estate | 2025 |
| Hoppyhomecreations Ltd | Manufacturing | 2024 |
| Hot N Spicy Ltd | Hospitality | 2019 |
| HR Rental Properties Ltd | Real estate | 2023 |
| Hughes Brothers Roofing Ltd | Construction | 2012 |
| Hush Barbers Limited | Other services | 2022 |
| I FIX Holdings Limited | Financial services | 2026 |
| IM Construction (Rhondda) Ltd | Construction | 2019 |
| IN & OUT Property Repairs & Maintenance Ltd | Manufacturing | 2025 |
| Independent Family Martial Arts Limited | Education | 2011 |
| Innovate Composites Ltd | Professional & scientific | 2018 |
| Inspire Power UK Ltd | Other services | 2007 |
| Inspired Power Ltd | Extraterritorial | 2024 |
| IRI Reinforcements & Concrete Limited | Construction | 2024 |
| Iris Property Developments Ltd | Construction | 2023 |
| J&M Upholstery Ltd | Manufacturing | 2004 |
| Jafaran Hand Car Wash Limited | Wholesale & retail | 2024 |
| James Norris Fitness Limited | Health & social care | 2025 |
| JAY Hughes Roofing Solutions Limited | Construction | 2026 |
| JDS (Europe) Limited | Wholesale & retail | 2021 |
| Jeff Davies & SON Gemstones & Faceting Limited | Other services | 2018 |
| JG Building Development Ltd | Construction | 2023 |
| JJ Entertainments RCT Limited | Arts & recreation | 2014 |
| Jones & Harries Pharm Limited | Wholesale & retail | 2023 |
| JRS Spray Render Specialists Ltd | Construction | 2023 |
| JT Labouring Ltd | Administrative & support | 2025 |
| K & P Frames Limited | Manufacturing | 2009 |
| K2 Resin Specialists Limited | Construction | 2025 |
| Kersey Care Limited | Health & social care | 2024 |
| KES Electrical Services South Wales Limited | Construction | 2024 |
| Kevin C Read Consultancy Ltd | Professional & scientific | 2019 |
| Lashesbylex Ltd | Other services | 2025 |
| Lazenby Training Ltd | Education | 2023 |
| LEE Hallam & Sons Ltd | Construction | 2021 |
| Leon Coles and Sons Property Development Limited | Real estate | 2025 |
| Levy Holiday Lettings Ltd | Hospitality | 2023 |
| Levy Property Ltd | Real estate | 2018 |
| Lewis John Music Ltd | Information & communication | 2025 |
| Lewis.Plumbing.Heating Ltd | Construction | 2024 |
| Liberty Financial Services (UK) Limited | Financial services | 2014 |
| Lifetime Wellness Chiropractic Clinics Limited | Health & social care | 2011 |
| Lili WEN Florist Limited | Wholesale & retail | 2022 |
| Lion Property Solutions Limited | Real estate | 2020 |
| Lioness Aurora Properties Ltd | Hospitality | 2023 |
| Little Dreamers Reborn Ltd | Wholesale & retail | 2025 |
| LL Labouring CYF | Administrative & support | 2025 |
| Lockstone Homes Ltd | Construction | 2025 |
| Love Treorchy Limited | Administrative & support | 2020 |
| LR Maintenance & Construction Ltd | Administrative & support | 2025 |
| LS32 Properties Limited | Real estate | 2022 |
| M Atkins Accounting Services Limited | Professional & scientific | 2024 |
| MAD Auto Detailing Ltd | Administrative & support | 2026 |
| Maemanns Properties Ltd | Real estate | 2025 |
| Mandaco 502 Limited | Other services | 2007 |
| Marley Clarke Associates Limited | Information & communication | 2017 |
| Mcsl Developments Limited | Real estate | 2019 |
| MDS Heating Installations Limited | Construction | 2024 |
| Measure Monitor Control Limited | Wholesale & retail | 2005 |
| Megasave Developments Limited | Construction | 2018 |
| Megcon Transport Ltd | Transport & logistics | 2006 |
| Metflix Limited | Wholesale & retail | 2023 |
| MGD Fire & Security Limited | Administrative & support | 2025 |
| Mind Body & Spirit Treorchy Limited | Wholesale & retail | 2021 |
| Miss Creemy's Limited | Wholesale & retail | 2023 |
| MJ Property Law Ltd | Professional & scientific | 2021 |
| MJP Media Ltd | Professional & scientific | 2022 |
| MKM Beauty Ltd | Wholesale & retail | 2025 |