| Nawroz Service Ltd | Health & social care | 2025 |
| Ncms Group Ltd | Extraterritorial | 2023 |
| NE Bakery & Sweet Experiences Ltd | Manufacturing | 2025 |
| Neath Construction Limited | Construction | 2014 |
| Neath Plant Construction Limited | Extraterritorial | 2018 |
| Neath Plant Hire Limited | Extraterritorial | 2018 |
| Neath Port Talbot Health and Wellbeing Group | Administrative & support | 2022 |
| Netsima Limited | Information & communication | 2001 |
| New Dunes Hotel Ltd | Hospitality | 2026 |
| New Sandfields Aberafan and Afan-Community Regeneration | Information & communication | 1998 |
| New Style Mobile Barber Ltd | Other services | 2020 |
| New Style Taibach Barbers Ltd | Other services | 2019 |
| New Talbot Barbers Ltd | Other services | 2024 |
| New Way Security and Events Ltd | Administrative & support | 2026 |
| New Work Engineering Ltd | Manufacturing | 2003 |
| Newton Down Estates Ltd | Construction | 2019 |
| Next-Generation Electrical and Security Ltd | Energy | 2018 |
| Nickolas Briz Ltd | Professional & scientific | 2024 |
| Nicky Snout&About Ltd | Other services | 2026 |
| Nigel Trott Developments Ltd | Construction | 2018 |
| Nine Training Limited | Professional & scientific | 2023 |
| Nine Training Services Limited | Professional & scientific | 2023 |
| Nirius Consulting Limited | Information & communication | 2002 |
| Nirius Limited | Information & communication | 2002 |
| Nirius Networks Limited | Information & communication | 2007 |
| NO. 1 Home Improvements Limited | Construction | 2010 |
| Noir Bear Ltd | Wholesale & retail | 2022 |
| Nolan Roadmarking Ltd. | Administrative & support | 1998 |
| Noon Building Services Ltd | Construction | 2026 |
| Nourra Limited | Hospitality | 2025 |
| NPT Access Ltd | Construction | 2019 |
| NPT Culture Collective CIC | Arts & recreation | 2025 |
| NPT Electrical Solutions Ltd | Construction | 2025 |
| Nsjl Limited | Other services | 2008 |
| Number 1 Mortgage Solutions Limited | Financial services | 2025 |
| Number Ninety Ltd | Households | 2023 |
| NUN Street (ST Davids) Ltd | Construction | 2021 |
| Nuxway Properties Limited | Construction | 2014 |
| Obeko Ltd | Professional & scientific | 2025 |
| OGI Farm Limited | Agriculture & fishing | 2021 |
| OGY Solutions Ltd | Professional & scientific | 2023 |
| Ohanas Playcentre Ltd | Arts & recreation | 2025 |
| OJO Triad Ltd | Hospitality | 2023 |
| Old Skool Cafe Ltd | Hospitality | 2026 |
| Olde Oak Developments Limited | Real estate | 1989 |
| Olympus Landscapes & Groundworks Ltd | Construction | 2025 |
| ON Target Supply Limited | Education | 2025 |
| One Step North Ltd | Professional & scientific | 2019 |
| Ontime Minibus Services Ltd | Transport & logistics | 2024 |
| Opergy Celtic Sea Ltd | Professional & scientific | 2024 |
| Opexa Wright Limited | Hospitality | 2025 |
| Opte Living Ltd | Information & communication | 2026 |
| Optigrid Interiors Limited | Construction | 2026 |
| Orchid Payroll (Commercial) Limited | Professional & scientific | 2019 |
| Orchid Payroll Limited | Other services | 2020 |
| Oriel Kitchens Ltd | Manufacturing | 2023 |
| Oroberto Construction Ltd | Construction | 2025 |
| Orphic Media Ltd | Information & communication | 2023 |
| Osborne Testing Ltd | Manufacturing | 2024 |
| OTM Property Development Ltd | Construction | 2024 |
| OUT4SUN Ltd | Hospitality | 2014 |
| P G Jones Transport Ltd | Transport & logistics | 2014 |
| P.E.M. Trailers Ltd | Transport & logistics | 2014 |
| Page's DIY Limited | Wholesale & retail | 1990 |
| Paintworx (SW) Limited | Wholesale & retail | 2014 |
| Paintworx Limited | Wholesale & retail | 2021 |
| Panda Porttalbot Limited | Hospitality | 2025 |
| Pantanas Care Centre Limited | Health & social care | 2011 |
| Pantheon Projects Ltd | Construction | 2023 |
| Para Property Investment Ltd | Construction | 2020 |
| Parallel Imports (Europe) Limited | Extraterritorial | 1999 |
| Parbaa Ltd | Wholesale & retail | 2025 |
| Parc Pendre ( Kidwelly) Ltd | Construction | 2022 |
| Parc Ynni Cymunedol Alwen Cyfyngedig | Construction | 2018 |
| Parithy Ltd | Wholesale & retail | 2017 |
| Pathfinder Airsoft Ltd | Arts & recreation | 2021 |
| Paul Costello Accountancy Ltd | Professional & scientific | 2008 |
| Paul Costello Accountancy Services Ltd | Professional & scientific | 2015 |
| Paul Costello Ltd | Professional & scientific | 2017 |
| PAW N Order Dog Grooming Limited | Other services | 2025 |
| PAW Patrol Dog Grooming and Pet Supplies Ltd | Other services | 2024 |
| PCC Housing Ltd | Real estate | 2026 |
| PD & SON Executive Travel Ltd | Transport & logistics | 2023 |
| Peachrose Studios International Limited | Information & communication | 2026 |
| Pebble Engineering Ltd | Professional & scientific | 2014 |
| Pegasus Decorating Limited | Construction | 2025 |
| Pelatis Online Ltd | Information & communication | 2013 |
| Pelenna Properties Ltd | Households | 2025 |
| Pelenna Property Partnership Limited | Real estate | 2010 |
| PEN Castle Pantry Ltd | Hospitality | 2025 |
| Penallta Construction Limited | Construction | 2023 |
| Pennaf Premier Properties Ltd | Real estate | 2020 |
| Pentadigm Limited | Wholesale & retail | 2021 |
| Pentflix International Ltd | Information & communication | 2026 |
| Pentrechwyth Road Ltd | Construction | 2021 |
| Pergar Limited | Wholesale & retail | 2023 |
| Pests and Pipes Limited | Construction | 2023 |
| Peta Firth Ltd | Hospitality | 2026 |
| Phan GIA Ltd | Other services | 2024 |
| Phase 3 Electrical Limited | Construction | 2000 |