| Ovon Ltd | Administrative & support | 2016 |
| Owoblow Limited | Manufacturing | 2008 |
| Ozali Limited | Hospitality | 2023 |
| Ozbay & Evans Limited | Transport & logistics | 2020 |
| Ozzo Limited | Information & communication | 2017 |
| P & D Construction and Groundworks Ltd | Construction | 2019 |
| P & K Global Limited | Real estate | 2024 |
| P a Smith Building Services Limited | Construction | 2018 |
| P Adrian Ltd | Construction | 2018 |
| P J Hatfield Ltd | Hospitality | 2019 |
| P J Rafferty Property Ltd | Real estate | 2017 |
| P M Handy Ltd | Administrative & support | 2016 |
| P&D Design Studio Ltd | Professional & scientific | 2026 |
| P&M ALL Home Solutions Limited | Construction | 2021 |
| P'Tit Chef Limited | Transport & logistics | 2022 |
| P.A. Sparks & Sons Limited | Wholesale & retail | 2005 |
| P3 Performance Limited | Professional & scientific | 2016 |
| PAC (Portugal) Limited | Administrative & support | 2008 |
| Pace Residential Limited | Real estate | 2015 |
| Paceseven IT Solutions Limited | Information & communication | 2021 |
| Pacey Foods Ltd | Hospitality | 2025 |
| Pacific Retail Ltd | Wholesale & retail | 2025 |
| PAD Buckett Ltd | Other services | 2017 |
| Padel Passport Ltd | Arts & recreation | 2026 |
| Paean Enterprises Limited | Real estate | 2017 |
| Paean Property Assets Limited | Real estate | 2019 |
| Pageants Planet Ltd | Administrative & support | 2024 |
| Paldi Trans Limited | Transport & logistics | 2023 |
| Palm Street Ventures Ltd | Professional & scientific | 2024 |
| Palvari Trading Limited | Hospitality | 2025 |
| Pamela Court Management Company Limited | Households | 1969 |
| PAN & Co. Properties Limited | Real estate | 2024 |
| Panayir Trade Co. Ltd | Wholesale & retail | 2022 |
| Panchal Property Limited | Real estate | 2024 |
| Papercuts and Pixels Limited | Arts & recreation | 2007 |
| Paradigm Shift Education Ltd | Information & communication | 2019 |
| Paradis Consultants Limited | Information & communication | 2014 |
| Park Mews (Hatfield) Management Company Limited | Households | 1980 |
| Park Street Marketing Ltd | Professional & scientific | 2019 |
| Parmartech Limited | Administrative & support | 2020 |
| Parswee Ltd | Wholesale & retail | 2024 |
| PAT Productions Ltd | Information & communication | 2026 |
| Patch Agency Ltd | Real estate | 2017 |
| Pathala Holdings Limited | Financial services | 2024 |
| Pauelle Limited | Information & communication | 2024 |
| Paultdale Ltd | Arts & recreation | 2017 |
| Pavitra Food and Restaurants Ltd | Hospitality | 2022 |
| Pawsitivity Ltd | Other services | 2021 |
| Paxons Limited | Wholesale & retail | 2024 |
| PAY Provider Limited | Other services | 2018 |
| Paybyphone Limited | Administrative & support | 2004 |
| Payfair Limited | Financial services | 2018 |
| Paynes and Borthwick Wharves Residents Company Limited | Households | 2006 |
| PBP Solutions Ltd | Transport & logistics | 2018 |
| PCO Assist Ltd | Administrative & support | 2025 |
| Peace of Mind Health and Well Being CIC | Health & social care | 2026 |
| Peaks Management Limited | Real estate | 2025 |
| Pearl IT Limited Liability Partnership | | 2007 |
| Pearson Close Management Company Limited | Other services | 2004 |
| Pegasus Global Solutions Limited | Professional & scientific | 2021 |
| Pelagoma Ltd | Health & social care | 2012 |
| Pelikinesis Limited | Other services | 2012 |
| Penciltip Ltd | Education | 2026 |
| Pendergate Hardings Ltd | Construction | 2017 |
| Pendergate Limited | Administrative & support | 1988 |
| Peniel Ventures Limited | Real estate | 2021 |
| Penn Clinic Community Outreach Clinic CIC | Health & social care | 2023 |
| PENNY2POUND Investment Ltd | Financial services | 2020 |
| Pentacox Ltd | Real estate | 2024 |
| People Beyond Profit Ltd | Administrative & support | 2023 |
| People Beyond Profit Talent Advisory LLP | | 2026 |
| Pepper Powers Ltd | Wholesale & retail | 2017 |
| Perennial Pharma Ltd | Wholesale & retail | 2019 |
| Perennial Pharmaceuticals Ltd | Wholesale & retail | 2024 |
| Perera NN Ltd | Transport & logistics | 2018 |
| Perfect Flow Plumbing Ltd | Construction | 2002 |
| Periidot Solutions and Consults Limited | Professional & scientific | 2025 |
| Perwin Investments Limited | Financial services | 2015 |
| Pet Property Projects Limited | Other services | 2010 |
| Peters Brothers Limited | Administrative & support | 1991 |
| Pettah Street Ltd | Wholesale & retail | 2020 |
| Peverall Bros. Limited | Construction | 1979 |
| PG Associates (London) Limited | Professional & scientific | 2014 |
| PG Hospitality Limited | Hospitality | 2018 |
| PH Gardens Limited | Administrative & support | 2015 |
| PH Landscaping and Driveways Ltd | Construction | 2026 |
| Pharmadex Logistics Limited | Transport & logistics | 2008 |
| Phasma Holdings Limited | Information & communication | 2022 |
| Philadelphia Hair & Beauty Salon Ltd | Wholesale & retail | 2026 |
| Phoenix Agencies UK Ltd | Wholesale & retail | 2021 |
| Phoenix Batteries Ltd | Manufacturing | 2026 |
| Phoenix Holdings (Herts) Limited | Financial services | 2023 |
| Phoenixx Care Ltd | Health & social care | 2021 |
| Phos International Limited | Financial services | 2025 |
| Phos Limited | Manufacturing | 2013 |
| Photo&Video R&G Ltd | Professional & scientific | 2025 |
| Physio Miles Ltd | Health & social care | 2022 |
| PI Squared Partners Limited | Professional & scientific | 2017 |
| Picasso Style Ltd | Other services | 2026 |
| Picture Films Limited | Information & communication | 2005 |