| Nationscup Ltd | Professional & scientific | 2019 |
| Nationwide AVA Fire Services Ltd | Public administration | 2019 |
| Naveedullah Khan Ltd | Wholesale & retail | 2024 |
| Nesture Limited | Construction | 2015 |
| New City 2025 Limited | Hospitality | 2025 |
| New Horizon Angling Ltd | Wholesale & retail | 2023 |
| New Start Care Services Ltd | Administrative & support | 2006 |
| Newid Designs Ltd | Manufacturing | 2025 |
| Newport City Services Ltd | Administrative & support | 2023 |
| Next Home Estate Agents Ltd | Real estate | 2025 |
| NG Properties & Construction Limited | Construction | 2025 |
| NJ Davies Property Limited | Real estate | 2025 |
| NL Engineering Ltd | Professional & scientific | 2022 |
| NLV Ltd | Professional & scientific | 2012 |
| NO Limit Training & Development Limited | Professional & scientific | 2010 |
| Noor (Blackwood) Ltd | Hospitality | 2017 |
| Nordam Europe Limited | Administrative & support | 1996 |
| North to South Contractors Ltd | Construction | 2024 |
| North to South Promotions Limited | Arts & recreation | 2026 |
| Norton Electrical Ltd | Construction | 2024 |
| NOT for the Paint Hearted Ltd | Construction | 2023 |
| Numbers Structured Limited | Professional & scientific | 2023 |
| Numi by RHI Limited | Other services | 2025 |
| Nurtural Limited | Agriculture & fishing | 2023 |
| Nuvo Designs Limited | Wholesale & retail | 2020 |
| Oakdale Chinese TAN Limited | Hospitality | 2025 |
| Oakdale Training & Assessment Acadamy Limited | Education | 2018 |
| Oakley Electrical Contractors Limited | Construction | 2011 |
| Oakridge Steel Limited | Transport & logistics | 1992 |
| Odyssey Sea Adventures Limited | Transport & logistics | 2022 |
| Omorphia Hair Limited | Other services | 2024 |
| One Point Business Solutions Ltd | Information & communication | 2017 |
| Onestop Global Ltd | Wholesale & retail | 2026 |
| Optimus Operations Limited | Professional & scientific | 2025 |
| Orchard Fields Property Sourcing Ltd | Real estate | 2024 |
| OT Training Ltd | Professional & scientific | 2024 |
| OTT Events Limited | Professional & scientific | 2018 |
| P Beese Services Ltd | Other services | 2017 |
| P2E Growth & Development CIC | Education | 2025 |
| Pack-It (3PL) Ltd | Transport & logistics | 2016 |
| Pack-It.Com Limited | Transport & logistics | 2000 |
| PAF Accounting Services Ltd | Professional & scientific | 2019 |
| Pagett Machinery Limited | Manufacturing | 2013 |
| Paint and Prep Ltd | Construction | 2016 |
| Pantymilah Limited | Agriculture & fishing | 2011 |
| Parsons Property Management Services Limited | Real estate | 2015 |
| Pash Designs Limited | Other services | 2012 |
| Passport to Employment Ltd | Administrative & support | 2016 |
| Paul Young Welding Services (UK) Limited | Manufacturing | 2007 |
| Paylec Ltd | Manufacturing | 2014 |
| PBH Facilities Services Limited | Administrative & support | 2015 |
| PC Mobility Services Limited | Manufacturing | 1999 |
| Pen-Y-Garn Property Management Limited | Real estate | 2021 |
| Pendragon Travel Ltd | Transport & logistics | 2026 |
| Pengam Curry Ltd | Hospitality | 2019 |
| Pengam Plant Limited | Administrative & support | 2025 |
| Penrhiw Engineering Services Limited | Professional & scientific | 2018 |
| Peppermint Group Ltd | Real estate | 2019 |
| PGB Limited | Construction | 2010 |
| Pharmacyx Ltd | Professional & scientific | 2020 |
| Photography by Alix Ltd | Professional & scientific | 2025 |
| Pink Nails (NP) Limited | Other services | 2022 |
| Pishko Barbers Ltd | Other services | 2026 |
| Pivot App Ltd | Information & communication | 2021 |
| Pixelforge Web Design Limited | Information & communication | 2025 |
| Plaspac UK Ltd | Wholesale & retail | 2006 |
| Plastering and Building Services Ltd | Construction | 2022 |
| Platinum First Finance Ltd | Financial services | 2016 |
| Plumb Wales Limited | Wholesale & retail | 2007 |
| PMR Property Investments Limited | Real estate | 2021 |
| Podfoot Ltd | Health & social care | 2023 |
| Podmed Podiatry Ltd | Health & social care | 2017 |
| Pondside Pantry Ltd | Hospitality | 2025 |
| Pontllanfraith Stores Limited | Wholesale & retail | 2023 |
| Powell & Thomas Limited | Real estate | 2024 |
| Powerserv Limited | Construction | 2005 |
| Poyner Plastering and Rendering Ltd | Construction | 2024 |
| Pride in Care Limited | Health & social care | 2012 |
| Pristine External Cleaning & Property Maintenance Ltd | Administrative & support | 2025 |
| Pristine Home Improvements #1 Ltd | Administrative & support | 2025 |
| Pristine Paving (UK) Ltd | Construction | 2014 |
| Prizsm Ltd | Information & communication | 2022 |
| Prizsm Technologies Ltd | Information & communication | 2017 |
| Pro Decorators Ltd | Construction | 2020 |
| Pro Heat Commercial Ltd | Construction | 2016 |
| Pro Shoot Firearms and Shooting Club Limited | Arts & recreation | 2018 |
| Pro-Property Group Holdings Ltd | Financial services | 2025 |
| Pro-Residential Lettings Ltd | Real estate | 2025 |
| Pro-Residential Ltd | Real estate | 2022 |
| Proconstruct Project Delivery Solutions Ltd | Professional & scientific | 2024 |
| Prometheus AI Limited | Information & communication | 2025 |
| Promotional Partners Limited | Wholesale & retail | 2010 |
| Property Whelan Limited | Real estate | 2013 |
| Provictis Limited | Professional & scientific | 2012 |
| Prydwyn Consulting Ltd | Public administration | 2022 |
| Psempirez Property Services Ltd | Hospitality | 2024 |
| PSP Properties Ltd | Construction | 2015 |
| Pthi Designs Limited | Construction | 2014 |
| Ptsw Solutions Limited | Construction | 2023 |
| Pure Chalets Limited | Administrative & support | 2014 |