| OTC Trading Ltd | Professional & scientific | 2026 |
| OTF Roofing Ltd | Construction | 2025 |
| Ottoman Services Ltd | Transport & logistics | 2024 |
| Oudees UK Limited | Hospitality | 2020 |
| OUR Voice Legal Ltd | Professional & scientific | 2019 |
| Outcast Innovation Limited | Information & communication | 2026 |
| Outlaw Pro Ltd | Wholesale & retail | 2019 |
| Ovencleanse Ltd | Other services | 2011 |
| Overflow Group Limited | Professional & scientific | 2019 |
| Overhead Catenary System Installation Limited | Construction | 2016 |
| Overhead Line Electrification Consulting Ltd | Construction | 2013 |
| Overton Automotive Holdings Limited | Professional & scientific | 2020 |
| Oview Lets Ltd | Hospitality | 2020 |
| Ovincent Ltd | Professional & scientific | 2025 |
| OVL Recovery Ltd | Health & social care | 2025 |
| Ownroom Ltd | Real estate | 2024 |
| Owolabi General Merchants Ltd. | Manufacturing | 2022 |
| Owusu Property Management Ltd | Real estate | 2023 |
| Oxford Environmental Consultants Limited | Professional & scientific | 2018 |
| Oxpower Construction Ltd | Construction | 2021 |
| Oyaks&Sons Ltd | Real estate | 2023 |
| Ozeix Limited | Wholesale & retail | 2017 |
| Ozer Enforcement Limited | Administrative & support | 2017 |
| P & D Commissions Limited | Other services | 2012 |
| P & D Selection Limited | Administrative & support | 2009 |
| P & K Restaurants Limited | Hospitality | 2009 |
| P & P Property (Essex) Limited | Construction | 2013 |
| P & R Environmental Services Limited | Construction | 2016 |
| P and B Electronics Limited | Manufacturing | 2005 |
| P B Pipework Limited | Construction | 2022 |
| P B Recruitment Consultants Limited | Administrative & support | 2011 |
| P Carter Electrical & Building Contractors Limited | Construction | 2009 |
| P D C Landscapes Limited | Construction | 2008 |
| P J Burch Joinery Ltd | Construction | 2008 |
| P M Chapman Construction Limited | Construction | 2019 |
| P Q Electrical Limited | Construction | 2007 |
| P W Construction (Essex) Limited | Construction | 2012 |
| P&Russ Ltd | Real estate | 2023 |
| P&V Property Development Ltd | Real estate | 2020 |
| P. a. L. Glass Machinery Limited | Administrative & support | 2000 |
| P. a. L. Management Limited | Professional & scientific | 2000 |
| P. Murray Electrical Services Limited | Construction | 2013 |
| P.A.L. Engineering Services Limited | Professional & scientific | 2000 |
| P.A.L. Tooling & Accessories Ltd | Wholesale & retail | 2019 |
| P.G.S Healthcare Limited | Health & social care | 2013 |
| P.I.P. Building Services Limited | Construction | 2010 |
| P.I.P. Electrics Limited | Construction | 1969 |
| P.I.P. Mechanical and Electrical Holdings Ltd | Construction | 2015 |
| P.N.G Cleaning Ltd | Construction | 2020 |
| P.S. Golf Limited | Wholesale & retail | 1994 |
| P1 Plumbing & Heating Ltd. | Construction | 2015 |
| Pablo 13 Ltd | Administrative & support | 2023 |
| Pace Educators Ltd | Professional & scientific | 2018 |
| Pace ICP Limited | Information & communication | 2024 |
| Pacific International Limited | Real estate | 2017 |
| Pacific Private Equity Limited | Financial services | 2013 |
| Paddy Contractors Ltd | Construction | 2016 |
| Padel Services Group Ltd | Information & communication | 2017 |
| Padena Ltd | Health & social care | 2020 |
| Pado Construction Ltd | Construction | 2019 |
| Pafra Adhesives Limited | Administrative & support | 1959 |
| Pagare Limited | Real estate | 2024 |
| Pakatak Limited | Information & communication | 2001 |
| Palace Yuancheng Limited | Manufacturing | 2025 |
| Pallet Repairs Ltd | Administrative & support | 2006 |
| Palmers Driving School Ltd | Education | 2019 |
| Palmers Law Limited | Professional & scientific | 2015 |
| Palmers Law Trust Corporation Limited | Professional & scientific | 2025 |
| Palmfruit Ltd | Wholesale & retail | 2020 |
| Palmira Fashion Limited | Wholesale & retail | 2025 |
| Palomino Groundwork & Dismantling Limited | Construction | 2021 |
| Palser & White Properties Ltd | Real estate | 2021 |
| PAN & Plan Culinaryconcept UK Ltd | Professional & scientific | 2025 |
| Panache Beauty & Wedding Hair Limited | Other services | 2016 |
| Panache Hair (Essex) Limited | Other services | 2016 |
| Panashco Estates Limited | Real estate | 2013 |
| Panashco Ltd | Administrative & support | 2011 |
| Panashco Properties Limited | Real estate | 2025 |
| Panavos Construction Ltd | Construction | 2019 |
| Pancake Palace Ltd | Hospitality | 2026 |
| Panleokuz Ltd | Health & social care | 2015 |
| Panoroof Limited | Construction | 2014 |
| Panterrea Limited | Other services | 2024 |
| PAPABEAR4HIRE Ltd | Administrative & support | 2025 |
| Papaya Phoenix Ltd | Professional & scientific | 2023 |
| PAR Flooring Limited | Construction | 2016 |
| Paragon Eco Ltd | Construction | 2023 |
| Paragon Independent Financial Advisers Limited | Extraterritorial | 2003 |
| Paragon Independent Limited | Financial services | 2003 |
| Paragon MMA Ltd | Arts & recreation | 2024 |
| Paragon Training Facility C.I.C. | Arts & recreation | 2022 |
| Paramount Pillars Properties Ltd | Real estate | 2024 |
| Parenesis Limited | Information & communication | 2000 |
| Parisa Javanis Limited | Wholesale & retail | 2024 |
| Park Avenue Interior Design Limited | Professional & scientific | 2026 |
| Parke Legal Consultancy Limited | Professional & scientific | 2021 |
| Parker Black Limited | Real estate | 2023 |
| Parker Grove Property Ltd | Real estate | 2015 |
| Parkhall DRY Cleaners Ltd | Other services | 2017 |
| Parkhurst Drywall Ltd | Construction | 2026 |