| Orange Leeds Limited | Real estate | 2021 |
| Orange Leicester Limited | Real estate | 2020 |
| Orange Lincoln Limited | Real estate | 2020 |
| Orange Liverpool Limited | Real estate | 2021 |
| Orange Living Ltd | Real estate | 2008 |
| Orange Lloyds Limited | Real estate | 2020 |
| Orange Loughborough Limited | Real estate | 2019 |
| Orange Manchester Limited | Real estate | 2022 |
| Orange Marge Limited | Real estate | 2020 |
| Orange Mortar Limited | Financial services | 2020 |
| Orange Newcastle Limited | Real estate | 2022 |
| Orange Nottingham Ltd | Real estate | 2019 |
| Orange York Limited | Real estate | 2025 |
| Orbit Energy Works Ltd | Construction | 2025 |
| Orbital Direct Limited | Transport & logistics | 2012 |
| Orchard Lodge Properties Limited | Real estate | 2020 |
| Order Line Limited | Health & social care | 2005 |
| Oria Nutrition Ltd | Wholesale & retail | 2026 |
| Orient House 24 Ltd | Hospitality | 2024 |
| Oriental Chef Mountsorrel Limited | Hospitality | 2022 |
| Origins Body Art Limited | Arts & recreation | 2018 |
| Orion Developments UK Limited | Wholesale & retail | 2000 |
| Orizio Textile Machines Limited | Wholesale & retail | 2005 |
| Orkal Ltd | Construction | 2019 |
| ORR Partners Ltd | Administrative & support | 2025 |
| Orrefors Limited | Real estate | 2022 |
| Orthodontic Supplies Limited | Wholesale & retail | 2012 |
| Osca Investments Ltd | Financial services | 2025 |
| Oscorp International Limited | Professional & scientific | 2024 |
| Ospreyfalcon Limited | Financial services | 2017 |
| Ostech Services Ltd | Information & communication | 2025 |
| Oswald COX Saws Limited | Other services | 1944 |
| OT Ball Properties Ltd | Hospitality | 2025 |
| OTI Design and Build Limited | Construction | 2018 |
| Ottas Lodge Ltd | Hospitality | 2026 |
| Oupia Limited | Real estate | 2018 |
| OUR Mental Health (UK) CIC | Health & social care | 2021 |
| Outdoor Catering Service Limited | Hospitality | 2025 |
| Outlaw Automotive Ltd | Other services | 2013 |
| Outwoods Edge Primary School | Education | 2012 |
| Outwoods Homes Ltd | Real estate | 2024 |
| Outwoods Pharmacy Limited | Wholesale & retail | 2023 |
| Oven Tales Limited | Manufacturing | 2025 |
| Ovenly Bakery Ltd | Manufacturing | 2026 |
| Owncore Technology Limited | Wholesale & retail | 2015 |
| Owning-It-Life Ltd | Administrative & support | 2025 |
| Oxalis Planning Limited | Administrative & support | 2010 |
| Oxford Street Investments Ltd | Real estate | 2022 |
| Oxygen Property Projects Ltd | Construction | 2014 |
| Oysta International Ltd | Professional & scientific | 2022 |
| Oysta Technology Ltd | Professional & scientific | 2008 |
| Ozmedia Limited | Manufacturing | 2018 |
| Ozone Stores Ltd | Wholesale & retail | 2019 |
| P & D H Consultancy Ltd | Other services | 2017 |
| P a W Haulage Limited | Administrative & support | 2017 |
| P G Morton Ltd | Professional & scientific | 2022 |
| P G Shisha Ltd | Hospitality | 2022 |
| P H G Buying Ltd | Other services | 2012 |
| P J Grimes Ltd | Transport & logistics | 2016 |
| P J Jackson & Associates Ltd | Financial services | 2016 |
| P M Martin (Holdings) Limited | Professional & scientific | 2000 |
| P O Safety Solutions Ltd | Construction | 2026 |
| P R Hydraulics Ltd | Manufacturing | 2012 |
| P S Lakes Ltd | Households | 2022 |
| P Wheatley Limited | Administrative & support | 2022 |
| P&C Houses Ltd | Real estate | 2025 |
| P&R Traders Ltd | Wholesale & retail | 2024 |
| P&T Inns Limited | Hospitality | 2018 |
| P.D.A. Communications Limited | Information & communication | 1993 |
| P.M. Kirby Limited | Information & communication | 2005 |
| Paceband Ltd | Wholesale & retail | 2026 |
| Pacey Fluid Power Ltd | Wholesale & retail | 2024 |
| Pack Mentality TCG Ltd | Wholesale & retail | 2025 |
| Packington Mews Management Company (2) Limited | Households | 2004 |
| Paddock Hedge Laying and Tree Care Limited | Agriculture & fishing | 2023 |
| Paddy's Sauces Ltd | Manufacturing | 2025 |
| Page Building Consultants Ltd | Construction | 2012 |
| Paige Louise Bridal Boutique Ltd | Wholesale & retail | 2024 |
| Paintworx Bodyshop Limited | Wholesale & retail | 2023 |
| Pala Padel Ltd | Administrative & support | 2025 |
| Pamella Properties Limited | Real estate | 2023 |
| Pamtec Ltd | Transport & logistics | 2025 |
| Pandya Optometry Limited | Health & social care | 2016 |
| Pano Properties Limited | Real estate | 2019 |
| Pantheon Studios UK Ltd | Information & communication | 2014 |
| Pantherella International Group Limited | Manufacturing | 2006 |
| Pantherella Limited | Manufacturing | 2001 |
| Paolo ET AL Ltd | Real estate | 2024 |
| Paragon Paraplanning Limited | Administrative & support | 2025 |
| Parify Group Limited | Manufacturing | 2017 |
| Parify Lighting Ltd | Manufacturing | 2013 |
| Parify Retail Design Ltd | Manufacturing | 2015 |
| Parish Mews Management (Loughborough) Limited | Households | 2016 |
| Park House Melton Limited | Hospitality | 2006 |
| Park Properties (Loughborough) Ltd | Real estate | 2002 |
| Parkcroft Holdings Limited | Financial services | 2023 |
| Parkland Services Limited | Wholesale & retail | 2021 |
| Parlando Limited | Households | 1989 |
| Parrish HR Consulting Ltd | Professional & scientific | 2023 |
| Partay Group Limited | Arts & recreation | 2023 |