| Popular Mortgages Ltd | Financial services | 2021 |
| Popular Partnerships Limited | Professional & scientific | 2023 |
| Popupcontact Ltd | Information & communication | 2025 |
| Popzee Ltd | Wholesale & retail | 2022 |
| Porford Services LP | | 2013 |
| Poris Duta Sarana LP | | 2011 |
| Porpoise Computer Services Limited | Information & communication | 2011 |
| Port and Pebbles Ltd | Real estate | 2025 |
| Port Enterprises L.P. | | 2012 |
| Port Marine Services L.P. | | 2012 |
| Port O Leith Boxing Club Limited | Education | 2021 |
| Port of Grangemouth Security Authority Limited | Extraterritorial | 2013 |
| Port Trade LP | | 2016 |
| Port Waterways LP | | 2014 |
| Porta Pups Dog Creche Ltd | Agriculture & fishing | 2020 |
| Portal Computing Limited | Administrative & support | 1998 |
| Portalino LP | | 2012 |
| Portbridge United L.P. | | 2012 |
| Portebello Food Limited | Hospitality | 2025 |
| Porters Property Holdings Limited | Real estate | 2026 |
| Portfence Finance SP | | 2002 |
| Portfolio Inventors Ltd | Professional & scientific | 2022 |
| Portgate Investments L.P. | | 2010 |
| Portgordon Maltings Limited | Manufacturing | 1979 |
| Portia Finance LP | | 2015 |
| Portica Quest LP | | 2017 |
| Portland Allied LP | | 2013 |
| Portland Continental L.P. | | 2008 |
| Portland Facilities Management Limited | Administrative & support | 2002 |
| Portland Hotel Management Limited | Professional & scientific | 2002 |
| Portland Hotels Limited | Administrative & support | 2002 |
| Portland Place Israel Limited Partnership | | 1994 |
| Portland Sales L.P. | | 2011 |
| Portlex Universal L.P. | | 2015 |
| Portline Alliance LP | | 2019 |
| Portmore Taxis Ltd. | Transport & logistics | 2006 |
| Porto Alegre LP | | 2013 |
| Porto Alegre SP | | 2003 |
| Porto Cars Ltd | Administrative & support | 2023 |
| Porto Forum LP | | 2016 |
| Porto Motors Edinburgh Limited | Wholesale & retail | 2025 |
| Porto Motors Limited | Wholesale & retail | 2020 |
| Porto Properties Associates Limited | Real estate | 2026 |
| Porto Shipping LP | | 2017 |
| Portobello Agricultural Research Services Ltd | Administrative & support | 2018 |
| Portobello Apple | Manufacturing | 2023 |
| Portobello Autos Limited | Wholesale & retail | 2025 |
| Portobello Barber Ltd | Other services | 2025 |
| Portobello Digital Limited | Information & communication | 2026 |
| Portobello Films Ltd | Information & communication | 2018 |
| Portobello Heating Solutions Ltd | Construction | 2021 |
| Portobello Heritage Trust | Other services | 2009 |
| Portobello Mews LLP | | 2024 |
| Portobello Mortgage Centre Ltd | Financial services | 2005 |
| Portobello Reporter Group Limited(The) | Information & communication | 1983 |
| Portobello Roofing Limited | Construction | 2013 |
| Portolio Ltd | Administrative & support | 2017 |
| Portree Partnership Limited | Hospitality | 1994 |
| Portway Marine L.P. | | 2011 |
| Porty Cafe Limited | Hospitality | 2020 |
| Porty Community Energy Ltd | Other services | 2020 |
| Porty Resources LP | | 2014 |
| Poseidon Logistics LP | | 2013 |
| Posh and Polish Cleaning Services Ltd | Administrative & support | 2025 |
| Posidonia Shipping UK LP | | 2022 |
| Positeam-International LP | | 2016 |
| Positioneering Group Limited | Professional & scientific | 2013 |
| Positive + Health Solutions Ltd | Education | 2014 |
| Positive About Business Limited | Administrative & support | 2012 |
| Positive Balance Ltd | Professional & scientific | 2022 |
| Positive Business LP | | 2013 |
| Positive Gamma Limited | Professional & scientific | 2010 |
| Positive Health Solutions Ltd | Administrative & support | 2017 |
| Positive Help | Other services | 1999 |
| Positive Management Holdings LP | | 2018 |
| Positive Management LP | | 2015 |
| Positive Nova Management LP | | 2016 |
| Positivo SP | | 2003 |
| Pospes & Co. | | 2008 |
| Possavi UK Ltd | Wholesale & retail | 2020 |
| Possfund Scotland GP Ltd | Real estate | 2009 |
| Possfund Scotland L.P. | | 2009 |
| Post Electric Artists Limited | Information & communication | 2021 |
| Postcode Active Trust | Arts & recreation | 2014 |
| Postcode Animal Trust | Arts & recreation | 2013 |
| Postcode Care Trust | Arts & recreation | 2011 |
| Postcode Children Trust | Arts & recreation | 2014 |
| Postcode Community Trust | Arts & recreation | 2014 |
| Postcode Culture Trust | Arts & recreation | 2012 |
| Postcode Earth Trust | Arts & recreation | 2015 |
| Postcode Education Trust | Arts & recreation | 2015 |
| Postcode Global Trust | Arts & recreation | 2013 |
| Postcode Green Trust | Arts & recreation | 2011 |
| Postcode Innovation Trust | Arts & recreation | 2016 |
| Postcode International Trust | Arts & recreation | 2014 |
| Postcode Justice Trust | Arts & recreation | 2013 |
| Postcode Local Trust | Arts & recreation | 2015 |
| Postcode Neighbourhood Trust | Arts & recreation | 2019 |
| Postcode Places Trust | Arts & recreation | 2019 |
| Postcode Planet Trust | Arts & recreation | 2014 |