| Polar 10 Limited | Professional & scientific | 2003 |
| Polar Finance Ltd. | Professional & scientific | 2017 |
| Polar Hydro Ltd | Professional & scientific | 2019 |
| Polar Lights Limited | Wholesale & retail | 2025 |
| Polarbear Builders Ltd | Professional & scientific | 2019 |
| Polarglaze Windows Limited | Construction | 2004 |
| Polaris Estate Holding Limited | Real estate | 2018 |
| Polaris M&M Limited | Health & social care | 2024 |
| Polash Indian Restaurant Limited | Hospitality | 2017 |
| Pold Holdings Limited | Administrative & support | 2010 |
| Pole Twisters Limited | Arts & recreation | 2007 |
| Poledawn Limited | | 1988 |
| Polestar Games Ltd | Information & communication | 2018 |
| Policy Insight Wales Ltd | Education | 2023 |
| Polimr Limited | Arts & recreation | 2015 |
| Polish Events Limited | Hospitality | 2017 |
| Polish Tavern Ltd | Hospitality | 2017 |
| Polish Women of Wales CIC | Education | 2026 |
| Polivotis Limited | Transport & logistics | 2025 |
| Polka Dots Childcare Afterschool Ltd | Education | 2018 |
| Polka Dots Childcare Ltd | Health & social care | 2018 |
| Polkastel Ltd | Wholesale & retail | 2020 |
| Pollard & Sons Plumbing and Heating Limited | Construction | 2021 |
| Pollhill Consulting Limited | Information & communication | 2014 |
| Pollington Transport Company Limited | Transport & logistics | 1973 |
| Polliwalks Co., Ltd | Professional & scientific | 2020 |
| Polly Heath Ltd | Professional & scientific | 2025 |
| Polm Ltd | Wholesale & retail | 2025 |
| Polo Club Co., Ltd | Wholesale & retail | 2020 |
| Polog Ltd | Administrative & support | 2021 |
| Polonix Ltd | Professional & scientific | 2025 |
| Poloro Recruiters Ltd | Administrative & support | 2020 |
| Polski Sklep European ELY Shop Ltd | Wholesale & retail | 2019 |
| Poly D. Ltd | Information & communication | 2024 |
| Polybridge Software Ltd | Information & communication | 2025 |
| Polyile Supply Ltd | Construction | 2019 |
| Polymed Limited | Manufacturing | 1985 |
| Polypack Services Ltd | Manufacturing | 2018 |
| Polyphemus Comms Limited | Professional & scientific | 2019 |
| Polyphotonic Ltd | Information & communication | 2021 |
| Pomar Limited | Wholesale & retail | 2025 |
| Pomark Ltd | Wholesale & retail | 2023 |
| Pomeroy Estates Limited | Real estate | 2025 |
| Pomraid Limited | Real estate | 2024 |
| Pond & Garden Building (Group) Ltd | Construction | 2025 |
| Poneit Limited | Wholesale & retail | 2021 |
| Ponnammah Consulting Limited | Health & social care | 2011 |
| Ponos Services Limited | Financial services | 2019 |
| Pont Llanio Limited | Real estate | 2020 |
| Pontcanna House Limited | Health & social care | 2014 |
| Pontcanna House Management Company Limited | Real estate | 2010 |
| Pontcanna Property Limited | Real estate | 2025 |
| Pontcanna Property Management Company Limited | Real estate | 2015 |
| Pontcanna RTM Company Limited | Households | 2023 |
| Pontcannau 2000 Ltd | Hospitality | 2005 |
| Pontec IT Ltd | Information & communication | 2014 |
| Pontio Ltd | Information & communication | 2015 |
| PONTK9 Dog Walking & Boarding Ltd | Other services | 2015 |
| Pontrhydyfen Investments Ltd | Financial services | 2013 |
| Pontypridd Books Ltd | Wholesale & retail | 2020 |
| Pontypridd Care Home Ltd | Health & social care | 2012 |
| Pontypridd Freehold Land Ltd | Real estate | 1887 |
| Pontypridd Town Football Club Limited | Arts & recreation | 2019 |
| Pooqe Ltd | Wholesale & retail | 2024 |
| POP Smoke Ltd | Other services | 2024 |
| POP UP Africa Limited | Wholesale & retail | 2015 |
| POP UP Festivals Limited | Arts & recreation | 2019 |
| Pop'N'Hops Ltd | Wholesale & retail | 2015 |
| Popal Limited | Wholesale & retail | 2019 |
| Popbeyond Ltd | Information & communication | 2020 |
| Popeth Collective Ltd | Health & social care | 2023 |
| Popex-Consulting Ltd | Professional & scientific | 2020 |
| Popexperience Ltd | Transport & logistics | 2018 |
| Popin Limited | Hospitality | 2019 |
| Poppelwood Limited | Extraterritorial | 2016 |
| Poppies Homes Limited | Real estate | 2015 |
| Poppy Beau Ltd | Construction | 2015 |
| Poppy Elizabeth Properties Ltd | Real estate | 2022 |
| Poppy Marketing Limited | Professional & scientific | 2016 |
| Poppy Translation Services Ltd | Professional & scientific | 2022 |
| Poppys Day Nursery Ayele Ltd | Administrative & support | 2016 |
| Populace Care Limited | Health & social care | 2023 |
| Porato Holding PC | | 2017 |
| Porelli Properties Limited | Real estate | 2021 |
| Porki Ltd | Professional & scientific | 2026 |
| Porky's Butchers Limited | Wholesale & retail | 2005 |
| Porol Flat Management Company Limited | Real estate | 1980 |
| Porquet Construction Management Limited | Construction | 2015 |
| Porsch Network CIC | Professional & scientific | 2026 |
| Porshia Hair & Beauty Ltd | Other services | 2025 |
| Port and Ship Services Limited | Extraterritorial | 2014 |
| Port Brick Developments Limited | Construction | 2024 |
| Port Royal Wine Bar & Restaurant Ltd | Hospitality | 2019 |
| Porta Vittoria Management Ltd | Manufacturing | 2020 |
| PORTA99 Global Ltd | Wholesale & retail | 2025 |
| Portabella AH Limited | Construction | 2020 |
| Portabella Old Probate Limited | Construction | 2022 |
| Portal Training Holdings Limited | Financial services | 2019 |
| Portal Training Limited | Education | 2010 |
| Portbec Forest Products (UK) Limited | Agriculture & fishing | 2011 |