| Orlando Sunshine Tickets Ltd | Administrative & support | 2022 |
| Ortomotion Limited | Wholesale & retail | 2001 |
| OSB Holdings Limited | Administrative & support | 2015 |
| Osbco Limited | Administrative & support | 2006 |
| Osbourne Park and Leisure Home Chassis Ltd | Manufacturing | 2019 |
| Osemoahu Limited | Health & social care | 2023 |
| Oskarsproperties Ltd | Professional & scientific | 2025 |
| OUT of Office Studio LLP | | 2021 |
| Outatime Consulting Limited | Arts & recreation | 2015 |
| Overstone Grange Farm Holdings Limited | Financial services | 2022 |
| Overstone Grange Farm Limited | Agriculture & fishing | 2019 |
| OWL Accounting Ltd | Professional & scientific | 2024 |
| Owlinadollar Ltd | Transport & logistics | 2023 |
| Own Land Homes Ltd | Construction | 2013 |
| Own Your Image Ltd | Wholesale & retail | 2026 |
| Oxford Safety Services Ltd | Professional & scientific | 2025 |
| OZ Group Ltd | Transport & logistics | 2020 |
| Ozge Worldwide Limited | Wholesale & retail | 2024 |
| P & a Engineering Consultants Limited | Professional & scientific | 2017 |
| P & T Builders Ltd | Construction | 2023 |
| P B Driver Services Limited | Transport & logistics | 2017 |
| P Drive Ltd | Administrative & support | 2017 |
| P. D. Tracey & Company Limited | Professional & scientific | 1998 |
| P.A. Geotechnical Limited | Extraterritorial | 2025 |
| P.A.I. Services Ltd | Other services | 2007 |
| P.A.R.E Investment Group Assets Limited | Financial services | 2025 |
| P.E. Enterprises Limited | Other services | 1994 |
| P.W. Chambers (Northampton) Limited | Real estate | 1963 |
| P2 Dynamics Solutions Ltd | Information & communication | 2011 |
| Paam Freight Ltd | Transport & logistics | 2026 |
| Pablo Best Repairs Ltd | Wholesale & retail | 2018 |
| Packman Holdings Limited | Financial services | 2025 |
| Pactt Healthcare Limited | Hospitality | 2020 |
| Padel Holdings Limited | Financial services | 2025 |
| PADEL4SCHOOLS Limited | Arts & recreation | 2026 |
| Padelmagic UK Limited | Wholesale & retail | 2024 |
| Padelx (Burghley) Limited | Arts & recreation | 2025 |
| Padelx (Ponsbourne) Limited | Arts & recreation | 2025 |
| Padelx (RAU) Limited | Arts & recreation | 2025 |
| Padelx (Todenham) Limited | Arts & recreation | 2025 |
| Padelx Club Limited | Arts & recreation | 2024 |
| Padelx NO. 10 Limited | Arts & recreation | 2025 |
| Padelx NO. 3 Limited | Arts & recreation | 2025 |
| Padelx NO. 6 Limited | Arts & recreation | 2025 |
| Padelx NO. 7 Limited | Arts & recreation | 2025 |
| Padelx NO. 8 Limited | Arts & recreation | 2025 |
| Padelx NO. 9 Limited | Arts & recreation | 2025 |
| Pagan Pearl Emporium Ltd | Manufacturing | 2024 |
| Pagc Limited | Real estate | 2025 |
| Pageo Holdings Ltd | Financial services | 2025 |
| Pageoconsulting Limited | Construction | 2013 |
| Pageocontracting Limited | Construction | 2009 |
| Paint Doctor Holdings Limited | Financial services | 2025 |
| Paint Doctor Limited | Wholesale & retail | 2006 |
| Paint Finishing Solutions Limited | Professional & scientific | 2014 |
| Pakotrans Ltd | Transport & logistics | 2025 |
| Paladin Lifts Limited | Manufacturing | 2024 |
| Paloma Fashion Ltd | Wholesale & retail | 2021 |
| PAM Interactive Limited | Education | 2017 |
| Panamaa Logistics Ltd | Transport & logistics | 2026 |
| Panda Gym Equipment Ltd | Wholesale & retail | 2025 |
| Panda Gym Installs Ltd | Manufacturing | 2021 |
| Parkin & SON Transport Ltd | Transport & logistics | 2020 |
| Parlance Property Development Ltd | Real estate | 2017 |
| Pass Applications LLP | | 2006 |
| Passing Shots Community Interest Company | Arts & recreation | 2009 |
| Passion Caring Ltd | Health & social care | 2020 |
| Passion to Care Ltd | Health & social care | 2019 |
| Past Souls Paranormal Ltd | Administrative & support | 2023 |
| Pastures Farm (Blaston) Management Company Ltd | Households | 2019 |
| Pat-Truck Fitting Services Ltd | Wholesale & retail | 2024 |
| Pathar Health Therapies Ltd | Health & social care | 2025 |
| Patocki Property Investments Ltd | Real estate | 2026 |
| Patricia Basas Resource Limited | Administrative & support | 2022 |
| Paul Church Plumbing & Heating Limited | Construction | 2003 |
| Paul Gayne Inspection Services Limited | Professional & scientific | 2021 |
| Paul Warwick Properties Ltd | Real estate | 2014 |
| Pauline Musiiwa Consultancy Limited | Health & social care | 2013 |
| PAV Automotive Services Ltd | Wholesale & retail | 2026 |
| Paxton Advisors Ltd. | Professional & scientific | 2010 |
| Payroll Centre (Northampton) Limited | Administrative & support | 2003 |
| PCL Finishing Ltd | Manufacturing | 2022 |
| PDR Method Ltd | Wholesale & retail | 2017 |
| Pe-Ko Ltd | Health & social care | 2010 |
| Peak Gardening Services Ltd | Administrative & support | 2015 |
| Peavey (Holdings) Limited | Professional & scientific | 1979 |
| Peavey Electronics Limited | Manufacturing | 1976 |
| Pediglam Ltd | Health & social care | 2025 |
| Peelaway Coatings Limited | Wholesale & retail | 1995 |
| Pefection Shipping Limited | Wholesale & retail | 2020 |
| Pegasus Logistics Solutions Ltd | Transport & logistics | 2025 |
| Pegasus Performing Arts CIC | Arts & recreation | 2024 |
| PEM Instal Ltd | Construction | 2026 |
| Pema Transport Ltd | Transport & logistics | 2021 |
| PEN Green Centre | Education | 2007 |
| Pentilla Limited | Extraterritorial | 2010 |
| Peony & Ember Limited | Manufacturing | 2025 |
| People Recruit Solution UK Limited | Administrative & support | 2024 |
| People Staff Limited | Administrative & support | 2024 |
| Pepe Express Ltd | Transport & logistics | 2025 |