| Oglaend System (UK) Limited | Wholesale & retail | 2000 |
| OHH Beautiful Ltd | Other services | 2020 |
| Old Bank Business Limited | Real estate | 2014 |
| Old Bank Conference Limited | Real estate | 2021 |
| Old Engine Kitchen Limited | Hospitality | 2026 |
| Oldbury Carpet Centre Limited | Wholesale & retail | 2019 |
| Olive Garden Homes Ltd | Real estate | 2025 |
| Olle! Ltd | Education | 2016 |
| Ollie Smith Web Development Services Limited | Information & communication | 2020 |
| Ollison Haulage Ltd | Transport & logistics | 2025 |
| OM JAS Construction Ltd | Construction | 2022 |
| Omaryasin Limited | Professional & scientific | 2025 |
| Omgthatpricecpx Limited | Wholesale & retail | 2022 |
| OMN Investments Limited | Financial services | 2024 |
| ON Point Fire and Security Limited | Administrative & support | 2016 |
| One Community Deaf Ltd | Professional & scientific | 2026 |
| One Fibre Telecoms Ltd | Construction | 2022 |
| One Home Store Ltd | Wholesale & retail | 2017 |
| One Merridale Limited | Real estate | 2025 |
| Ongkur Ltd | Real estate | 2024 |
| Only Driveways & Patios Ltd | Construction | 2025 |
| Only Grabs & Diggers Ltd | Construction | 2022 |
| OP Pharma Ltd | Professional & scientific | 2014 |
| Open Care Solutions Ltd | Health & social care | 2019 |
| Optimum Healthcare U.K. Ltd | Administrative & support | 2022 |
| Optimum Plumbing & GAS Services Limited | Construction | 2014 |
| Orapi Maintenance UK Limited | Manufacturing | 2007 |
| Orchard Maintenance Limited | Administrative & support | 2013 |
| Organic Beehive Products Ltd | Transport & logistics | 2017 |
| Origin Hair and Beauty WM Ltd | Other services | 2022 |
| Ormt Limited | Education | 2017 |
| Osborne Builder Limited | Wholesale & retail | 2021 |
| Osce Ltd | Education | 2025 |
| Osman Ecommerce Ltd | Wholesale & retail | 2026 |
| Owen Motoring Club Limited | Arts & recreation | 1978 |
| Oxbridge Education Network Ltd | Education | 2013 |
| P Cars Ltd | Wholesale & retail | 2022 |
| P J Meats Ltd | Hospitality | 2018 |
| P&J Building Services Ltd | Construction | 2019 |
| P&M Driveways & Sons Ltd | Construction | 2023 |
| P&P Bespoke Interiors Ltd | Manufacturing | 2023 |
| P.E.F. Building Services Ltd | Construction | 2023 |
| P.R.D. Fasteners Limited | Manufacturing | 2006 |
| P.W.F. Ltd. | Wholesale & retail | 1995 |
| Packman Group Limited | Administrative & support | 2025 |
| Pajee Motors Ltd | Wholesale & retail | 2022 |
| PAK Haulier Limited | Wholesale & retail | 2021 |
| PAL 2020 Limited | Financial services | 2019 |
| PAL Adhesive Products Limited | Manufacturing | 1980 |
| PAL Estate Limited | Extraterritorial | 2011 |
| PAL Extrusions Limited | Extraterritorial | 1994 |
| PAL Glazing Products Limited | Extraterritorial | 1990 |
| PAL Group Limited | Financial services | 2013 |
| PAL Plastic Supercentres Limited | Extraterritorial | 2002 |
| Palam Properties Limited | Other services | 2003 |
| Panama Coffee Equipment Limited | Wholesale & retail | 2025 |
| Pandylex Consult Ltd | Information & communication | 2026 |
| Panoramic Perfection Limited | Administrative & support | 2025 |
| Para-Catoi Ltd | Transport & logistics | 2018 |
| Parikarama Ltd | Hospitality | 2025 |
| Paris Logistic Ltd | Transport & logistics | 2017 |
| Park Lane Pharma (Wednesbury) Ltd | Wholesale & retail | 2020 |
| Park View Community Limited | Health & social care | 2011 |
| Parm Sidhu UK Ltd | Transport & logistics | 2025 |
| Parmbury Windows Limited | Manufacturing | 2013 |
| Parsun's Ltd | Real estate | 2016 |
| Partridge Court Management Company Limited | Households | 1992 |
| Partridge Court Residents Association Limited | Households | 2024 |
| Pash 247 Construction Services Limited | Construction | 2022 |
| Pash Constructions Limited | Construction | 2017 |
| Paskin's Fire & Security Ltd | Construction | 2026 |
| Pass Perfect Driver Training Ltd | Education | 2023 |
| Paul Trueman and Associates Limited | Professional & scientific | 2000 |
| Paulsmith HGV Services Limited | Transport & logistics | 2012 |
| Paws on Raws (Wednesbury) Ltd | Wholesale & retail | 2025 |
| Peacock Fish Bar Ltd | Hospitality | 2026 |
| Pearls Car Hire Ltd | Administrative & support | 2021 |
| Pearsons Commercial Properties Limited | Real estate | 2008 |
| Pearsons of Wednesbury Limited | Wholesale & retail | 2011 |
| Peel Wood Fire Italian Pizzeria Ltd | Hospitality | 2025 |
| Pegah Ltd | Hospitality | 2025 |
| Pehowa Transports Ltd | Transport & logistics | 2024 |
| Pembridge Capital Investments Ltd | Administrative & support | 2019 |
| Penkbrook Contracts Ltd | Construction | 2019 |
| Pennant's Jerk & Gelato Ltd | Hospitality | 2019 |
| Peplow Logistics & Recruitment Limited | Construction | 2025 |
| Perez Family Holdings Limited | Real estate | 2025 |
| Perfa Solutions Ltd | Information & communication | 2022 |
| Perfect Keys Ltd | Wholesale & retail | 2022 |
| Performance 99 Ltd | Wholesale & retail | 2022 |
| Perkins Distribution Limited | Transport & logistics | 1999 |
| Perrydalenarrowboats Ltd | Manufacturing | 2014 |
| Pervas Property Investment Ltd | Real estate | 2023 |
| PG Deliveries Limited | Transport & logistics | 2016 |
| Pgur Logistics Ltd | Transport & logistics | 2023 |
| Pharmaccount Ltd | Health & social care | 2016 |
| Pharmazen Healthcare Ltd | Wholesale & retail | 2025 |
| Pheonix Scaffolding Ltd | Construction | 2017 |
| Phimar Management Limited | Professional & scientific | 2009 |
| Phiri Investments Limited | Health & social care | 2015 |