| One Driver App Ltd | Professional & scientific | 2022 |
| One Focus Ltd | Information & communication | 2018 |
| One Stop South West Ltd | Administrative & support | 2023 |
| One World Global Trade Management Limited | Information & communication | 2015 |
| Onideky Limited | Public administration | 2025 |
| Only Essex Driving Limited | Education | 2013 |
| Onovok Limited | Real estate | 2020 |
| Onyvo IT Consultancy Limited | Information & communication | 2025 |
| Onyx Canine Services Ltd | Other services | 2025 |
| Orange Cloud Ventures Limited | Information & communication | 2021 |
| Organika Thai Spa Ltd | Health & social care | 2021 |
| Orrb Limited | Information & communication | 2022 |
| Oscar Blush Limited | Professional & scientific | 2015 |
| Osteria Upminster Limited | Hospitality | 2026 |
| Ottson Ltd | Real estate | 2024 |
| OWL Wood Limited | Administrative & support | 2017 |
| OWR Structural Services Ltd | Construction | 2021 |
| Oxley IT Consultancy Services UK Limited | Information & communication | 2022 |
| OXYGEN24 Ltd | Professional & scientific | 2008 |
| Oz-Tech GAS Services Ltd | Construction | 2023 |
| P a Investment Solutions Limited | Financial services | 2021 |
| P Huckfield Ltd | Construction | 2013 |
| P&J Christmas Trees Ltd | Wholesale & retail | 2025 |
| P&P Automation Limited | Construction | 2025 |
| P&Z Consulting Ltd | Professional & scientific | 2019 |
| P. Mckelvey & Co Limited | Professional & scientific | 2003 |
| Paco Logistics Ltd | Transport & logistics | 2018 |
| Paint and Paper Emporium Ltd | Construction | 2015 |
| Painting History Ltd | Information & communication | 2021 |
| Palm Bond Developments Ltd | Construction | 2016 |
| Palmers Builders Limited | Construction | 2006 |
| Panchem (UK) Ltd | Wholesale & retail | 2003 |
| Pandf Productions Ltd | Arts & recreation | 1999 |
| PAR Propco Limited | Real estate | 2024 |
| Parkview M&E Ltd | Professional & scientific | 2020 |
| Partner and Protect Limited | Administrative & support | 2020 |
| Partyco Ltd | Hospitality | 2024 |
| Parvaan Properties Ltd | Financial services | 2019 |
| Patchett Forest Products Limited | Manufacturing | 1999 |
| Pathways Childern's Care Ltd | Health & social care | 2025 |
| Paul James Blinds & Shutters Ltd | Wholesale & retail | 2011 |
| Paul Reader Consultancy Ltd | Professional & scientific | 2024 |
| Paul Walden Interiors Ltd | Construction | 2020 |
| Pawel Brodzinski Software Limited | Information & communication | 2013 |
| Paylight Limited | Administrative & support | 1989 |
| PBL Group Ltd | Construction | 2016 |
| PBL Holdings Limited | Construction | 2018 |
| Pcmc Limited | Extraterritorial | 2011 |
| Pcms Cleaning Services Limited | Administrative & support | 2019 |
| PCS Skip Hire Limited | Water & waste | 2018 |
| Peacemaker Group Ltd | Information & communication | 2025 |
| Peachy Physique Ltd | Arts & recreation | 2021 |
| Pearce Hillman Limited | Professional & scientific | 2019 |
| Pearson's Posh Parlour Dog Grooming Ltd | Wholesale & retail | 2024 |
| Peewits Penthouse Limited | Real estate | 2022 |
| Peker Ltd | Hospitality | 2017 |
| Pelbi Limited | Hospitality | 2018 |
| Pelican Two Limited | Professional & scientific | 1987 |
| Pembridge Retail Limited | | 2012 |
| Penenden Heath Investments LLP | | 2009 |
| Penlin Tech Ltd | Information & communication | 2025 |
| Penthouse Wells Limited | Real estate | 2022 |
| Pera Real Estate Ltd | Real estate | 2025 |
| Perfectly Recruiting Ltd | Administrative & support | 2017 |
| Perling Building Services Ltd | Construction | 2018 |
| Perling Developments Ltd | Construction | 2025 |
| Perling Racing Ltd | Wholesale & retail | 2025 |
| Perpetual Property Services Limited | Construction | 2016 |
| Personal Vapour Ltd | Wholesale & retail | 2014 |
| Pesquier Data Solutions Ltd | Information & communication | 2025 |
| Petals and Threads Ltd | Wholesale & retail | 2025 |
| Petra Grace Property Limited | Households | 2025 |
| Petsa Ltd | Hospitality | 2024 |
| Petsder Limited | Information & communication | 2015 |
| PGB Investment Consulting Ltd | Professional & scientific | 2023 |
| PGM Heating and Plumbing Ltd | Construction | 2008 |
| Phannatiq Limited | Agriculture & fishing | 2008 |
| Phillip Cukelj Ltd | Households | 2024 |
| Piece of PIE Productions Limited | Information & communication | 2020 |
| Pilatescoreuk Ltd | Health & social care | 2026 |
| Pink Cleaning Maids Ltd | Administrative & support | 2020 |
| Pinnacle Trade Windows Ltd | Construction | 2018 |
| Pinney Talfourd LLP | | 2006 |
| Pinney Talfourd Solicitors Limited | Professional & scientific | 2013 |
| Pinney Talfourd Wealth Management Limited | Financial services | 2015 |
| Pipemix Limited | Information & communication | 2021 |
| Pipers Consulting Ltd | Professional & scientific | 2021 |
| Pipetech Solutions Ltd | Energy | 2015 |
| Pkll Consulting Limited | Financial services | 2021 |
| Plan a Financials Limited | Professional & scientific | 2014 |
| Platinum Property Holdings Limited | Real estate | 2022 |
| Pleef LLP | | 2017 |
| Plenum Systems Limited | Manufacturing | 1999 |
| Plumel Ltd | Construction | 2018 |
| PMP 2014 Ltd | Construction | 2014 |
| POB H&S Ltd | Administrative & support | 2023 |
| Point Break Productions Ltd | Arts & recreation | 2019 |
| Poly Estates Limited | Real estate | 2025 |
| Poole Contracting Ltd | Construction | 2026 |
| Portall Solutions Limited | Financial services | 2011 |