| Llysmorfa Management Ltd | Other services | 2021 |
| Long Live Events Ltd | Administrative & support | 2025 |
| Longoed Ltd | Construction | 2025 |
| M & R Construction Limited | Construction | 2004 |
| M Hayward & Daughter (South Wales) Limited | Wholesale & retail | 2002 |
| M T Jewellery Ltd | Manufacturing | 2012 |
| Maesgwyn Garage Limited | Manufacturing | 2014 |
| Magventure Ltd | Manufacturing | 2017 |
| Mark Waghorn Architects Limited | Professional & scientific | 2010 |
| Mary Ellen's Limited | Hospitality | 2011 |
| Medistat Limited | Administrative & support | 2025 |
| Menter Dinefwr | Administrative & support | 2006 |
| Mentrus Cyfyngedig | Administrative & support | 2009 |
| Mercedes Fitness Ltd | Other services | 2012 |
| Meredith Davies Agri Repairs Ltd | Agriculture & fishing | 2004 |
| Merry Consult Ltd | Mining & quarrying | 2014 |
| Metn Property Ltd | Real estate | 2025 |
| MTB Uplift Wales Limited | Arts & recreation | 2021 |
| MWD Makers Ltd | Manufacturing | 2018 |
| N B Interiors and Construction Limited | Construction | 2018 |
| N.57 Ltd | Hospitality | 2024 |
| Ndml Ltd | Construction | 2025 |
| Neath Tailoring Co. Limited | Administrative & support | 2011 |
| Neuroble Ltd | Education | 2021 |
| NGL Solutions Ltd | Professional & scientific | 2025 |
| Nice Price News Limited | Transport & logistics | 2016 |
| Noisy Newt Books / Llyfrau Madfall Swnllyd Limited | Wholesale & retail | 2025 |
| Notarius Limited | Professional & scientific | 2021 |
| Octavian Homes Ltd | Construction | 2021 |
| Olympic Computers Limited | Information & communication | 1982 |
| Orange Peel Limited | Construction | 2006 |
| Orgasmix Cacao Ltd | Manufacturing | 2023 |
| Osian T Williams CYF | Professional & scientific | 2021 |
| OTH Holdings 2015 Limited | Extraterritorial | 2015 |
| OTH Holdings Limited | Professional & scientific | 2008 |
| OTH Limited | Professional & scientific | 1999 |
| Owen Jeffrey Davies CYF | Real estate | 2023 |
| P L Gauntlett Accounts Limited | Professional & scientific | 2003 |
| P.R.C. Maintenance Services Limited | Agriculture & fishing | 2003 |
| Paradise Inns Limited | Hospitality | 2021 |
| Parc Pencrug Management Company Limited | Households | 2004 |
| Park Farm Management Co. Ltd | Households | 2025 |
| Pedair Cainc CYF | Manufacturing | 2021 |
| Penrhiw Residents Ltd | Households | 2019 |
| Perkins Renewable Energy Ltd | Administrative & support | 2011 |
| Peter Griffiths (Talley) Limited | Wholesale & retail | 2019 |
| PJH Beynon Holdings Ltd | Construction | 2026 |
| Platinum Letting Solutions Ltd | Real estate | 2024 |
| Prop Group Ltd | Hospitality | 2024 |
| Puddleplants Limited | Wholesale & retail | 2016 |
| Pure Glitter Ltd | Manufacturing | 2021 |
| Quadrant Resolution Limited | Professional & scientific | 2016 |
| R W K Lewis Limited | Water & waste | 2009 |
| R.E.D Free Consultants Ltd | Information & communication | 2014 |
| Race Around Wales Ltd | Arts & recreation | 2020 |
| Ravenscroft Retreats Ltd | Hospitality | 2021 |
| RBE Construction Ltd | Construction | 2017 |
| Red Oak Transport Ltd. | Professional & scientific | 2024 |
| Red Pines Ranch Ltd | Agriculture & fishing | 2025 |
| RELOC8 Removal & House Clearances Ltd | Transport & logistics | 2020 |
| Rhandir Holdings CYF | Real estate | 2024 |
| Rhianne Powell Painter and Decorator Ltd | Construction | 2012 |
| Rhiw Ltd | Professional & scientific | 2013 |
| Rhodri Gomer CYF. | Information & communication | 2013 |
| RLM Plumbing Limited | Construction | 2002 |
| ROB Hughes Builder Ltd | Construction | 2025 |
| ROC Authentic Wood Fired Pizza Ltd | Wholesale & retail | 2025 |
| ROE Green Nursery Limited | Education | 2002 |
| RPR Grooming Ltd | Other services | 2026 |
| Rufus Travel Ltd | Administrative & support | 2018 |
| Run G Productions Ltd | Information & communication | 2022 |
| S Conway Construction Ltd | Construction | 2014 |
| S.Pritchard Evans & Co Ltd | Professional & scientific | 2018 |
| S2M Consultancy Ltd | Professional & scientific | 2021 |
| S2M Consultants Ltd | Professional & scientific | 2018 |
| Salem GÂR Ltd | Arts & recreation | 2024 |
| Sapaca Ltd | Hospitality | 2026 |
| Sculpture Studio Editions Limited | Arts & recreation | 2010 |
| Seed and Root Nature School CIC | Education | 2024 |
| Shaun George (Plumbing & Heating) Limited | Construction | 2010 |
| SHJ Metallurgical Consulting Service Limited | Professional & scientific | 1994 |
| Sians Emporium Limited | Agriculture & fishing | 2021 |
| Sians Workshop Limited | Manufacturing | 2022 |
| Social Care Consulting Limited | Administrative & support | 2020 |
| Solar Save Renewables Limited | Construction | 2018 |
| Station Motors MOT Centre Ltd | Extraterritorial | 2019 |
| Strumat Limited | Water & waste | 2002 |
| Stubbings Accountancy & Bookkeeping Services Ltd | Professional & scientific | 2013 |
| Stybarrow Kennels Ltd | Agriculture & fishing | 2017 |
| Supreme Equestrian Giveaways Ltd | Wholesale & retail | 2019 |
| Sustainable Soil Limited | Manufacturing | 2023 |
| Sylfaen CYF | Financial services | 2024 |
| Syrfewr JED Cyfyngedig | Professional & scientific | 2009 |
| System Change Cymru CIC | Professional & scientific | 2025 |
| T Geoff Jones Ltd | Agriculture & fishing | 2010 |
| Tablic Ltd | Administrative & support | 2009 |
| Tafarn Cwmdu Limited | Wholesale & retail | 2000 |
| Tafarn UN Ltd | Hospitality | 2019 |
| Talley Community Amenity Association | Agriculture & fishing | 2002 |
| Talley Sawmill Ltd | Agriculture & fishing | 2016 |