| ON Demand Deliveries 24-7 Ltd | Transport & logistics | 2026 |
| ON Point Healthcare Services Ltd | Health & social care | 2019 |
| ON the Bright Side Window Cleaners Limited | Administrative & support | 2021 |
| ON the Spanners Gear Ltd | Manufacturing | 2026 |
| ON Time Consultants Ltd | Professional & scientific | 2025 |
| On-Point Post Ltd | Transport & logistics | 2026 |
| On-Power Electrical Services Ltd | Construction | 2018 |
| On-Power Services Ltd | Construction | 2018 |
| One Hill Brand Holdings Ltd | Wholesale & retail | 2016 |
| One Hill Brands Ltd | Wholesale & retail | 2025 |
| One Planet Renewables Ltd | Education | 2021 |
| Online Marketing Surgery Ltd | Information & communication | 2013 |
| Only Traders and Courses Ltd | Professional & scientific | 2016 |
| Onpoint Electrics Limited | Construction | 2020 |
| Oodles Creative Solutions Ltd | Professional & scientific | 2023 |
| Opal Solutions Limited | Professional & scientific | 2009 |
| Openbrain Limited | Information & communication | 2023 |
| Operational Transformations Limited | Administrative & support | 2016 |
| Opris Transport Ltd | Transport & logistics | 2025 |
| Optimal Executive Solutions Limited | Professional & scientific | 2009 |
| Optimal Sports Performance Limited | Arts & recreation | 2014 |
| Optimum Resolution Limited | Construction | 2021 |
| Optimum Security & Risk Management Limited | Financial services | 2020 |
| Orange Plant Cannock Ltd | Agriculture & fishing | 2021 |
| Orbis Integra Ltd | Health & social care | 2025 |
| Orgasmic Limited | Wholesale & retail | 1999 |
| Oribi Engineering Limited | Information & communication | 1996 |
| Orlean Holdings Ltd | Real estate | 2021 |
| OSA Door Parts Limited | Manufacturing | 2001 |
| Osprey Powerboat Rescue Team Limited | Arts & recreation | 2012 |
| Osprey Rescue Team Ltd | Arts & recreation | 2006 |
| Osprey Technology Limited | Information & communication | 2022 |
| Oswestry Equestrian Centre Limited | Hospitality | 2015 |
| Otterman Plumbing Ltd | Construction | 2025 |
| Outdora Limited | Wholesale & retail | 2025 |
| Outlaws and Outcasts Clothing Co. Ltd | Wholesale & retail | 2021 |
| Outreachers 1 Ltd | Health & social care | 2022 |
| Owen Autobodies Limited | Wholesale & retail | 2015 |
| Owen Commercials Limited | Wholesale & retail | 2006 |
| Owen Interior Decorating Limited | Construction | 2024 |
| Oyster (North) Ltd | Extraterritorial | 2022 |
| Oyster Communications Limited | Manufacturing | 1984 |
| Oyston Industrial Invest (UK) Ltd | Health & social care | 2025 |
| OZ Weld Ltd | Manufacturing | 2019 |
| Ozone Efficiency Wolverhampton Limited | Manufacturing | 2016 |
| O’Gina Rail and Construction Limited | Construction | 2025 |
| P & J Carpentry Limited | Construction | 2008 |
| P & P LEE Property Limited | Construction | 2020 |
| P a Surveys & Engineering Limited | Professional & scientific | 2009 |
| P J Bates Limited | Construction | 2004 |
| P N Block Paving & Landscaping Limited | Construction | 2013 |
| P Perkins Plastering Limited | Construction | 2017 |
| P Wilkinson Electrical Ltd | Construction | 2002 |
| P. Brealey Building Services Limited | Construction | 2008 |
| P.M. Couriers Ltd | Transport & logistics | 2021 |
| P.M.B.S (Payne Mechanical & Building Services) Ltd | Construction | 2026 |
| P.Matthews Design Limited | Professional & scientific | 1996 |
| P.O.D. Plumbing Services Limited | Construction | 2012 |
| P.S WE Care Ltd. | Health & social care | 2020 |
| P2B Property Limited | Real estate | 2018 |
| Paediatric Training Solutions Ltd | Administrative & support | 2026 |
| Pago Refrigeration & Air CON Ltd | Manufacturing | 2011 |
| PAL CSI Limited | Professional & scientific | 2019 |
| Palfrey Service Station Limited | Extraterritorial | 1988 |
| Paltineanu&C Ltd | Transport & logistics | 2024 |
| Paltrans Ltd | Other services | 2026 |
| Papas Pizza Co Cannock Ltd | Hospitality | 2022 |
| Pari Shope Ltd | Wholesale & retail | 2025 |
| Park House Design Limited | Extraterritorial | 2014 |
| Park Oak Services Limited | Professional & scientific | 2025 |
| Parker & Ward Limited | Construction | 2005 |
| Parker James Consultants Ltd | Professional & scientific | 2013 |
| Parker Rose Limited | Construction | 2023 |
| Parnum Homes Ltd | Real estate | 2025 |
| Partington Engineering Limited | Manufacturing | 2002 |
| Parts Town UK Limited | Wholesale & retail | 1999 |
| Partsworld Investment Limited | Real estate | 2021 |
| Partsworld Limited | Wholesale & retail | 1995 |
| PATHWAY11. Ltd | Education | 2026 |
| PATHWAY18. Ltd | Education | 2026 |
| Pati&Domi Ltd | Transport & logistics | 2014 |
| Patrick House (Chadsmoor) Limited | Administrative & support | 1991 |
| Paul & Brads Jolly Fryer Limited | Hospitality | 2021 |
| Paul Baker Painting & Decorating Limited | Construction | 2019 |
| Paul Biddle Limited | Other services | 2008 |
| Paul Boynton Marketing Consultant Limited | Information & communication | 2011 |
| Paul Fowler (Carpentry) Ltd | Construction | 2008 |
| Paul's Property and Maintenance Ltd | Construction | 2026 |
| Paulmeadowsphoto Ltd | Professional & scientific | 2026 |
| Paxium Limited | Information & communication | 2011 |
| Paydana Ltd | Financial services | 2025 |
| PBX1 Limited | Transport & logistics | 2024 |
| PC Paramedic Solutions Ltd | Information & communication | 2005 |
| Pcbg Limited | Hospitality | 2023 |
| PCH Tiling Limited | Construction | 2013 |
| PCR E Performance Limited | Wholesale & retail | 2021 |
| PDP Renovations & Building Ltd | Construction | 2026 |
| PDW Creative Materials Ltd | Wholesale & retail | 2016 |
| Peace of Mind Property Ltd | Real estate | 2020 |
| Peace of Mind Wellbeing Ltd | Health & social care | 2021 |