| OEM Computer Systems Limited | Information & communication | 2011 |
| Ohill International (U.K.) Company Limited | Wholesale & retail | 2005 |
| Oikos Property Limited | Real estate | 2024 |
| Olaxi Co., Ltd | Administrative & support | 2024 |
| Old Money Luxury Co., Ltd | Extraterritorial | 2024 |
| Olive & Stone Property Limited | Real estate | 2022 |
| Olive Stone Ltd | Real estate | 2025 |
| Oliver Parker Limited | Administrative & support | 2020 |
| Oltako Limited | Information & communication | 2019 |
| Olteo Limited | Professional & scientific | 2022 |
| Olver & Rawden Limited | Professional & scientific | 2018 |
| Omitto Ltd | Extraterritorial | 2025 |
| Omsa Group Ltd | Extraterritorial | 2019 |
| Onco Exhibitions & Events Ltd | Administrative & support | 2024 |
| Onco Holding Ltd | Financial services | 2024 |
| Onew Winzone Co., Ltd | Extraterritorial | 2019 |
| Online-Images.Com Limited | Administrative & support | 1999 |
| Onniva Limited | Information & communication | 2024 |
| Opal Global Shipping Co., Ltd | Extraterritorial | 2024 |
| Openitservices Ltd | Information & communication | 2026 |
| Operate Acumen Ltd | Professional & scientific | 2020 |
| Opna Group Ltd | Other services | 2025 |
| Oporotheca Limited | Real estate | 2013 |
| Optimis Limited | Information & communication | 2008 |
| Optimised IT Solutions Ltd | Information & communication | 2023 |
| Orange Crafts Co., Ltd | Administrative & support | 2020 |
| Orchestra DA Camera Limited | Arts & recreation | 1969 |
| Orien Chemical Co., Ltd. | Manufacturing | 2018 |
| Orloff Limited | Manufacturing | 2003 |
| Orobo Healthcare Ltd | Health & social care | 2025 |
| Orobo Limited | Information & communication | 2022 |
| Oromiq Ltd | Information & communication | 2026 |
| ORR Associates Limited | Professional & scientific | 2006 |
| Ortholegal Reporting Limited | Health & social care | 2013 |
| Orthos Renovations Ltd | Construction | 2025 |
| OSM Management Ltd | Real estate | 2020 |
| Other Business Limited | Information & communication | 2013 |
| Otwo Medcare Limited | Administrative & support | 2024 |
| Ouhao Trading Co., Ltd | Extraterritorial | 2023 |
| Oulton Hall Delta OP Co Limited | Hospitality | 2019 |
| Outa Environment Protection Technology Company Limited | Administrative & support | 2013 |
| Overdale Fabrics Limited | Wholesale & retail | 2015 |
| Oxford Numerics Ltd | Information & communication | 2012 |
| OXN Holdings Limited | Real estate | 2026 |
| P & B Corporate Limited | Hospitality | 2024 |
| P.W. Falcon Limited | Transport & logistics | 2009 |
| PAB Mechanical Services Ltd | Construction | 2024 |
| Pacific Star International Limited | Administrative & support | 2023 |
| Pacnext Limited | Transport & logistics | 1996 |
| Palat Limited | Professional & scientific | 1992 |
| Pall Industries Limited | Wholesale & retail | 2018 |
| Panchun Electronic Co., Ltd | Administrative & support | 2022 |
| Panda Global International Co., Ltd | Administrative & support | 2019 |
| Panis Focaccia Ltd | Hospitality | 2024 |
| Panyue International Limited | Administrative & support | 2019 |
| Panyue Machinery Co., Ltd | Administrative & support | 2024 |
| Paper Stitch Ltd | Professional & scientific | 2016 |
| Paradise Partnership Limited | Professional & scientific | 2011 |
| Pard Int'L Limited | Extraterritorial | 2010 |
| Parkhill Bathrooms Ltd | Construction | 2017 |
| Parkhill Renovations Ltd | Construction | 2026 |
| Pasler Art Supplies Ltd | Wholesale & retail | 2021 |
| Passmore & Oliver Partners Limited | Professional & scientific | 2025 |
| Patterson Home Developments Ltd | Construction | 2021 |
| Paul Richardson Design Ltd | Professional & scientific | 2016 |
| Paul Thwaites Brand + Identity Ltd | Professional & scientific | 2018 |
| Paul Tracey Construction Ltd | Construction | 2021 |
| Pavinder Dhani Ltd | Real estate | 2025 |
| Pcicj Investments Limited | Financial services | 2023 |
| Pdco Ltd | Construction | 2009 |
| PDN Consult Ltd | Professional & scientific | 2009 |
| Peacock Hospitality Limited | Hospitality | 2023 |
| Peacock Hotel Kenilworth Limited | Hospitality | 2023 |
| Peanuts Treasure Chest Ltd | Wholesale & retail | 2019 |
| PEN to Print Ltd | Professional & scientific | 2017 |
| Pengfc Trading Limited | Wholesale & retail | 2026 |
| Penghang International Trade Co., Ltd | Manufacturing | 2017 |
| Pengw Trading Limited | Wholesale & retail | 2026 |
| Pennant Ecology Limited | Professional & scientific | 2023 |
| Pennington Dental Care Limited | Health & social care | 2009 |
| Pennington House Management Company (Kenilworth) Limited | Real estate | 2004 |
| Penrose Studios Ltd | Wholesale & retail | 2021 |
| Pepper Lane Amenity Land Management Company Limited | Households | 2006 |
| Pepper Lane Flats 1-3 Management Company Limited | Households | 2006 |
| Pepper Therapy Limited | Health & social care | 2014 |
| Perkins and Robinson Sports Warwickshire Ltd | Arts & recreation | 2022 |
| Perlong International Limited | Administrative & support | 2017 |
| Perry Interim Management Services Limited | Professional & scientific | 2000 |
| Peter Staunton Design Limited | Manufacturing | 2016 |
| Ph&J Limited | Professional & scientific | 2008 |
| Pharmacy Partner Limited | Professional & scientific | 2012 |
| Phil Hodgkinson Consulting Limited | Professional & scientific | 2019 |
| Phil's Bar & Kitchen Services Limited | Hospitality | 2023 |
| Phillips Accounting Organisation Limited(The) | Real estate | 1975 |
| Phillips and Becker Ltd | Professional & scientific | 2010 |
| Phlebotomy Services Ltd | Health & social care | 2020 |
| Phoebesam Limited | Arts & recreation | 1960 |
| Phoenix Family Psychology Limited | Health & social care | 2014 |
| Phoenix Psychological Services Limited | Health & social care | 2007 |
| Phone Clinic 90 Ltd | Other services | 2018 |