| Partynplay Ltd | Hospitality | 2020 |
| Passmores Solicitors Limited | Professional & scientific | 2010 |
| Passport to Play Day Nursery Limited | Education | 2006 |
| Pastai Ltd | Manufacturing | 2024 |
| Patersons Performance Bikes Ltd | Wholesale & retail | 2026 |
| Paul Ingram Employment & Recruitment Ltd | Administrative & support | 2022 |
| Paul John Roberts Ltd | Financial services | 2021 |
| Paving Resolved Ltd | Manufacturing | 2019 |
| Pawfectly Clean Cymru Limited | Other services | 2025 |
| PB Develop Limited | Information & communication | 2023 |
| PDC Digital Solutions Limited | Manufacturing | 2003 |
| Peacock Scaffolding Solutions Ltd | Construction | 2024 |
| Pear Tree Properties South Wales Ltd | Real estate | 2022 |
| Pearce & Ahmun Property Limited | Construction | 2024 |
| Pearl Beth Investments (UK) Ltd | Financial services | 2022 |
| Pearl Court 2011 (Cardiff) Ltd | Real estate | 2011 |
| Pegroup Limited | Construction | 2011 |
| Peirianneg Awyrennol Cyfyngedig | Manufacturing | 2014 |
| Peking City Barry Limited | Hospitality | 2025 |
| Penarth Healthcare Ltd | Health & social care | 2021 |
| Pentgrange Limited | Health & social care | 2015 |
| Pepjo Ltd | Hospitality | 2025 |
| Perdita Peau Limited | Wholesale & retail | 2021 |
| Pereira Marine Services Limited | Administrative & support | 2005 |
| Perfect Blue Flame Ltd | Construction | 2022 |
| Peri Bay Ltd | Hospitality | 2023 |
| Perk of the JOB Limited | Professional & scientific | 2011 |
| Petals Training Limited | Education | 2014 |
| Petrichor Industries Ltd | Wholesale & retail | 2025 |
| Pharmalocate Limited | Wholesale & retail | 2020 |
| Phil Underdown Engineering Ltd | Professional & scientific | 2015 |
| Phoenix Crystal Ltd | Health & social care | 2019 |
| Phoenix Education and Arts Ltd | Education | 2022 |
| Phoenix Life and Mortgages Limited | Financial services | 2022 |
| Pictons Corporate Relocation Services Ltd | Real estate | 2019 |
| Pier Resources & Training Ltd | Administrative & support | 2009 |
| Pink Garlic Tandoori Ltd | Hospitality | 2018 |
| Pink Peony Wedding and Event Design Ltd | Professional & scientific | 2021 |
| Pitstop UK 2022 Ltd | Wholesale & retail | 2023 |
| Pixelsky Ltd | Information & communication | 2021 |
| Pizza BOI 1 Ltd | Hospitality | 2024 |
| Pizza Perfection Ltd | Hospitality | 2015 |
| Pizza Time Barry Ltd | Hospitality | 2024 |
| Pizza UP Limited | Hospitality | 2026 |
| PL Scaffolding Solutions Ltd | Construction | 2020 |
| Plastercraft Ltd | Construction | 2023 |
| Plastratum Limited | Manufacturing | 2018 |
| Platinum Cleaning & Laundry Services Ltd | Administrative & support | 2023 |
| PLB Ecowood Limited | Agriculture & fishing | 2011 |
| PM Contract Cleaning (Services) Limited | Administrative & support | 2015 |
| Pmcostplanning Ltd | Professional & scientific | 2025 |
| PME Consulting Services Limited | Professional & scientific | 2023 |
| PME Electrical & Mechanical Services Ltd | Extraterritorial | 2023 |
| Point 5 Installations Limited | Manufacturing | 2012 |
| Pokestus Ltd | Wholesale & retail | 2022 |
| Polar Peak Investments Limited | Real estate | 2015 |
| POO Pickers Ltd | Water & waste | 2025 |
| Poplargrove Properties Limited | Real estate | 1994 |
| Porsh UK Ltd | Other services | 2026 |
| Portglenone Refridgeration Services Ltd | Wholesale & retail | 2025 |
| Porthkerry Brickwork Ltd | Construction | 2024 |
| Porthkerry Chiropody Practice Ltd | Other services | 2015 |
| Porthkerry Lettings Ltd | Real estate | 2018 |
| Posh on Wheels Limited | Hospitality | 2024 |
| Power & Co. CC Ltd | Administrative & support | 2025 |
| Powered by Dragons Ltd | Energy | 2023 |
| Practice Pilot Ltd | Health & social care | 2017 |
| Prawanna Limited | Health & social care | 2025 |
| Precise Fit Contracting Ltd | Construction | 2026 |
| Precision Training Academy Ltd | Education | 2025 |
| Preloved Project CIC | Wholesale & retail | 2025 |
| Premier Daily Ltd | Wholesale & retail | 2017 |
| Premier Japanese Imports Ltd | Wholesale & retail | 2026 |
| Premier Roofing (Wales) Limited | Construction | 2013 |
| Premier Scaffolding (Cardiff) Limited | Administrative & support | 2016 |
| Prestige Bathroom Solutions Limited | Construction | 2023 |
| Prestige Ventures Limited | Other services | 2011 |
| Primal Rugby Ltd | Manufacturing | 2025 |
| Priory Lettings and Property Management Limited | Real estate | 2022 |
| Priory Property Management Services Ltd | Real estate | 2011 |
| Pristine Smart Repairs Ltd | Wholesale & retail | 2023 |
| PRM Alloys Ltd | Wholesale & retail | 2026 |
| PRN Cost Consult Ltd | Administrative & support | 2016 |
| Pro FIX Carpentry and Plumbing Ltd | Construction | 2026 |
| Pro Move CDF Ltd | Transport & logistics | 2026 |
| Pro-Noctis Limited | Education | 2014 |
| Proactive Cleaning Solutions Limited | Administrative & support | 2023 |
| Procare Cleaning Services Limited | Administrative & support | 2025 |
| Procare Construction Cleaning Ltd | Administrative & support | 2025 |
| Proctor Property Ltd | Real estate | 2019 |
| Professional Intermediary Introducers Ltd | Financial services | 2009 |
| Project Swan Bidco Limited | Other services | 2020 |
| Project Swan Midco Limited | Other services | 2020 |
| Project XX Limited | Real estate | 2026 |
| Projector Ltd | Information & communication | 2023 |
| Promoting Independence Ltd | Professional & scientific | 2012 |
| Properties by KB Ltd | Hospitality | 2026 |
| Propzilla Ltd | Information & communication | 2019 |
| Protool Hire and Sales Limited | Administrative & support | 1996 |
| Protube Access Ltd | Construction | 2026 |