| Outline Trees Ltd | Professional & scientific | 2026 |
| Outlook Integrated Services Ltd | Construction | 2024 |
| Outrageous Fortune Films Ltd | Information & communication | 2014 |
| Outreach Brighter Futures Limited | Health & social care | 2023 |
| Outreach Healthcare Ltd | Health & social care | 2020 |
| Outseats Farm Management Company Limited | Real estate | 2017 |
| OVA Networks Ltd | Construction | 2023 |
| Over the Wall Camp | Education | 1999 |
| Overall Logistics Ltd | Transport & logistics | 2026 |
| Overdrive Logistics Limited | Information & communication | 2005 |
| Overfields Management Company Limited | Households | 2001 |
| Overline Management Ltd | Professional & scientific | 2025 |
| Overmarsh Projects Ltd | Professional & scientific | 2021 |
| Overseas Solutions Ltd | Professional & scientific | 2015 |
| OVI BORD24 Ltd | Transport & logistics | 2024 |
| Oviso Financial Services Ltd | Financial services | 2005 |
| Oviso Holdings Limited | Financial services | 2018 |
| OVO Ophthalmic Services Ltd | Health & social care | 2018 |
| OVS Derby Ltd | Other services | 2022 |
| Owen Taylor and Sons Holdings Limited | Financial services | 2018 |
| Owen Taylor and Sons Limited | Manufacturing | 1975 |
| OWL Engineering Ltd | Construction | 2025 |
| OWL Property Services Ltd | Real estate | 2020 |
| Owlers Lane Management Ltd | Professional & scientific | 2017 |
| Owlit Limited | Information & communication | 2018 |
| Owls Kids Club Ltd | Education | 2018 |
| Oxford Invest Ltd | Real estate | 2025 |
| Oxydise Wellness Derby Limited | Health & social care | 2026 |
| OY Building Surveying Ltd | Professional & scientific | 2025 |
| Oyam Limited | Wholesale & retail | 2016 |
| Ozark Automotive Limited | Wholesale & retail | 2026 |
| Ozcorp Tax & Financial Consultants Limited | Professional & scientific | 2025 |
| OZL Ltd | Construction | 2025 |
| Ozzy Tech Mobile Ltd | Wholesale & retail | 2024 |
| P & H Plumbing and Heating Limited | Construction | 2023 |
| P & K Engineering Services (UK) Limited | Manufacturing | 2016 |
| P & L Air Conditioning Limited | Construction | 2019 |
| P & M Flooring (UK) Limited | Administrative & support | 2006 |
| P & S Flowers (UK) Limited | Wholesale & retail | 2005 |
| P & S Holiday Rentals Ltd | Households | 2026 |
| P & S Investments (Derby) Limited | Real estate | 2025 |
| P Adams Installations Ltd | Construction | 2022 |
| P and L Johal Limited | Real estate | 2022 |
| P and M Sameday Couriers Ltd | Transport & logistics | 2026 |
| P and S Hospitality SW Ltd | Hospitality | 2026 |
| P C K Accountants Ltd | Professional & scientific | 2014 |
| P Eliot Services Ltd | Real estate | 2020 |
| P G M Claydon Limited | Financial services | 2016 |
| P J Formwork Limited | Construction | 2020 |
| P J Recruitment Limited | Administrative & support | 2007 |
| P J Sealants Limited | Construction | 1985 |
| P L Ambrose Limited | Financial services | 2004 |
| P Leeder Limited | Health & social care | 2010 |
| P M Corbett Limited | Construction | 2001 |
| P M P Howell Limited | Real estate | 2003 |
| P M R Contracting (Derby) Ltd | Administrative & support | 2013 |
| P M S Consultant (Derby) Ltd | Professional & scientific | 2017 |
| P O D Engineering Limited | Professional & scientific | 2008 |
| P R Farrell Limited | Financial services | 2023 |
| P W Hand Ltd | Construction | 2017 |
| P&D Property Developments Limited | Construction | 2024 |
| P&G Matthews Crane Services Ltd | Construction | 2014 |
| P&M House Letting Ltd | Real estate | 2024 |
| P&R3 (UK) Ltd | Health & social care | 2019 |
| P&Y Services Ltd | Administrative & support | 2017 |
| P-Pot Limited | Professional & scientific | 2016 |
| P. Ducker Systems Limited | Information & communication | 1988 |
| P. G. Aesthetics Academy Ltd | Education | 2023 |
| P. J. Yates Limited | Agriculture & fishing | 2011 |
| P. O. Plumbing Services Limited | Construction | 2003 |
| P. S. G. Body Shop Limited | Wholesale & retail | 2025 |
| P. S. G. Derby Limited | Wholesale & retail | 2017 |
| P. Sitarek Logistics Ltd | Transport & logistics | 2022 |
| P.A. Building Services Ltd | Construction | 2026 |
| P.D.R. Gard Limited | Financial services | 2008 |
| P.F Harrison Joinery Ltd | Construction | 2012 |
| P.J.Mack Limited | Hospitality | 2020 |
| P.M. Mechanical Limited | Construction | 2001 |
| P.M.S 17 Ltd | Construction | 2017 |
| P.Nathan Entertainment Group Ltd | Arts & recreation | 2025 |
| P.S.M Care Services Ltd | Health & social care | 2015 |
| P.S.T. (U.K.) Limited | Extraterritorial | 1990 |
| P.T Engineering (UK) Ltd | Manufacturing | 2013 |
| P1 Engineering Limited | Construction | 2003 |
| P2ELL Consulting Ltd | Professional & scientific | 2024 |
| Paalu Properties Limited | Real estate | 2024 |
| Paassaa Ltd | Information & communication | 2026 |
| PAC Properties Limited | Real estate | 2002 |
| Pack Direct Limited | Administrative & support | 2019 |
| Packbenefit Business Services Limited | Hospitality | 2024 |
| Packborough Ltd | Real estate | 2022 |
| Packet People Ltd | Information & communication | 2026 |
| PAD Command Consultancy Ltd | Administrative & support | 2023 |
| Paddock Electrical Services Limited | Construction | 2017 |
| Padelgo Ltd | Arts & recreation | 2025 |
| Padelé Ltd | Wholesale & retail | 2026 |
| Padley Trading Ltd | Wholesale & retail | 1991 |
| Padmecat Ltd | Real estate | 2020 |
| Padstone Property Services Limited | Real estate | 2005 |
| Paesani GA Ltd | Hospitality | 2023 |