| NOT Normal Construction Limited | Professional & scientific | 2013 |
| NOT Normal Development Limited | Professional & scientific | 2013 |
| Nova Pellis UK Ltd | Other services | 2023 |
| Novabit Limited | Information & communication | 2025 |
| Novium Fuel Limited | Manufacturing | 2024 |
| Nurtured by Nature Skincare Ltd | Wholesale & retail | 2025 |
| Nurturing Nests Care Limited | Health & social care | 2018 |
| NW Rugby League 26 Limited | Arts & recreation | 2026 |
| NW Salvage Ltd | Wholesale & retail | 2020 |
| NWT Horseshoes Limited | Wholesale & retail | 1996 |
| O Caddick Welding Services Ltd | Manufacturing | 2016 |
| Oak Properties (Wrexham) Limited | Construction | 2015 |
| Oaksmith Financial Planning Ltd | Financial services | 2020 |
| Obsidian Automotive Group Ltd | Wholesale & retail | 2026 |
| Office Maid Perfect Ltd | Administrative & support | 2021 |
| Ogden Joinery Ltd | Construction | 2018 |
| OI Creations Ltd | Professional & scientific | 2025 |
| OKJ Electrical Ltd | Construction | 2022 |
| OKJ Properties Ltd | Real estate | 2026 |
| Old Mill Holiday Cottages Ltd | Hospitality | 2015 |
| Old Padeswood Members Club Limited | Arts & recreation | 2015 |
| Oldford Texels Limited | Agriculture & fishing | 2013 |
| ON Grade Machine Control Limited | Administrative & support | 2005 |
| ON the Corner Limited | Hospitality | 2015 |
| One Complete Composite Windows & Doors Ltd | Construction | 2024 |
| One Complete Installations Ltd | Construction | 2017 |
| One Foot Limited | Manufacturing | 2001 |
| Onezest Solutions Ltd | Construction | 2017 |
| Online Productivity Training Ltd | Professional & scientific | 2018 |
| Onthespanners Limited | Wholesale & retail | 2013 |
| Onyx Tanning Studio Ltd | Other services | 2025 |
| Open RS Ltd | Manufacturing | 2023 |
| Opspal Ltd | Information & communication | 2017 |
| Optivia Limited | Real estate | 2013 |
| Opus Assets Limited | Real estate | 2018 |
| Orbis Business Solutions Ltd | Professional & scientific | 2018 |
| Orbit Prime Ltd Ltd | Information & communication | 2026 |
| Orbit Property Services Ltd | Real estate | 2025 |
| Oriorwaith J. Sarnowski CYF. | Manufacturing | 2024 |
| OS Trading & Engineering Limited | Professional & scientific | 2018 |
| Osprey Lodge Management Limited | Hospitality | 2019 |
| Outside Lives Ltd | Health & social care | 2019 |
| Ovid Financial Ltd | Financial services | 2017 |
| Oyster CAY Limited | Wholesale & retail | 2014 |
| P & D Civil Engineering Ltd | Construction | 2019 |
| P and a Fencing and Sheds Limited | Manufacturing | 1985 |
| P and a Pallets Limited | Professional & scientific | 1985 |
| P G. Armstrong Limited | Construction | 2011 |
| P R M Property Limited | Real estate | 1996 |
| P Smith Farriers Ltd | Manufacturing | 2014 |
| P&Kw Installations Ltd | Construction | 2019 |
| P. Clisham Consulting Ltd | Professional & scientific | 2020 |
| Padel Vortex Ltd | Arts & recreation | 2025 |
| Padeswood & Buckley Golf Club Ltd | Arts & recreation | 2023 |
| Palebo Limited | Professional & scientific | 2002 |
| Pandora International Limited | Arts & recreation | 2025 |
| PANGEA4WD Ltd | Information & communication | 2025 |
| Paradis Services Ltd | Wholesale & retail | 2019 |
| Parallel Care Solutions Limited | Health & social care | 2020 |
| Parallel Training Solutions Ltd | Administrative & support | 2019 |
| Parc Ynni Banc Y Celyn CYF | Energy | 2021 |
| Parc Ynni Calon Y Gwynt CYF | Energy | 2021 |
| Parker-Redvers Ltd | Real estate | 2025 |
| Parkland Homes Ltd | Construction | 2019 |
| Parry Griffiths Homes Limited | Construction | 2005 |
| Pass to Freedom Ltd | Education | 2017 |
| Paterson Macaulay & Owens Ltd | Construction | 2023 |
| Paul Allman Plastering Ltd | Construction | 2024 |
| Paul Evans Decorating Limited | Construction | 2003 |
| Paul Michael Hair Limited | Other services | 2022 |
| Paul's Sandwich Shop Ltd | Hospitality | 2016 |
| Paving Innovations Limited | Manufacturing | 2009 |
| Paymán Holdings Ltd | Hospitality | 2017 |
| PBS Utility Services Ltd | Construction | 2018 |
| Peace of Mind Properties Ltd | Real estate | 2019 |
| Peal Enterprise Ltd | Real estate | 2019 |
| Pearse Properties Ltd | Real estate | 2024 |
| Pebble Projects Limited | Administrative & support | 2004 |
| Pedder Properties Ltd | Households | 2017 |
| Peers Homes Ltd | Real estate | 2020 |
| Penleah Limited | Real estate | 2018 |
| Penley Homes (NW) Ltd | Construction | 2024 |
| Perfect Kitchens & Bedrooms (NW) Limited | Construction | 2025 |
| Performance Indicators Ltd | Other services | 2015 |
| PG Framing Ltd | Wholesale & retail | 2012 |
| PGL Property Enterprises Limited | Real estate | 2017 |
| PH Clinical Limited | Professional & scientific | 2006 |
| Phase Electrical Solutions Limited | Construction | 2006 |
| Pheromax Technology Ltd | Manufacturing | 2009 |
| Phil Hughes (Consultant) Ltd | Administrative & support | 2006 |
| Philip M Heard Consulting Ltd | Professional & scientific | 2009 |
| Phoenix Coach and Consult Ltd | Other services | 2024 |
| Picky Penelope Ltd | Wholesale & retail | 2024 |
| Piedbull-Arrowcars Limited | Transport & logistics | 2020 |
| Pier (Penarlag) Limited | Professional & scientific | 2023 |
| Pinkturtle Collectables Ltd | Wholesale & retail | 2026 |
| Pinnacle Sports Injury Clinic Limited | Health & social care | 2024 |
| Pixel Property Investments Limited | Real estate | 2025 |
| Pizzaffle Fast Food Ltd | Hospitality | 2025 |
| Planet Finance Ltd | Financial services | 2021 |