| Outdoor Futures Ltd | Professional & scientific | 2021 |
| Outlaw Star Limited | Hospitality | 2020 |
| Outline Surveying Limited | Professional & scientific | 2011 |
| Outsource My Accounts Limited | Professional & scientific | 2015 |
| Outsourced Financial Solutions Ltd | Professional & scientific | 2019 |
| Outta Skool Limited | Education | 2009 |
| Outtaschool Learning Centre Ltd | Education | 2025 |
| Ovation Interior Flooring Design Limited | Construction | 1999 |
| Overhill Property Management Limited | Real estate | 2022 |
| Owen Brothers Metering UK Limited | Manufacturing | 2007 |
| OWL Doors & Windows Ltd | Manufacturing | 2021 |
| OWL Estates & Management Ltd | Real estate | 2019 |
| Owl's Cafe Ltd | Hospitality | 2019 |
| Owler Group Ltd | Professional & scientific | 2022 |
| Owls Gate (Lees) Management Limited | Real estate | 2009 |
| Owunmi Candy Ltd | Hospitality | 2023 |
| Oxford House Inns Limited | Extraterritorial | 2014 |
| Oxford Street Shop Ltd | Wholesale & retail | 2026 |
| Oxhide London Ltd | Wholesale & retail | 2025 |
| Oxin Joinery Limited | Manufacturing | 2025 |
| Oystercatcher Investments Limited | Financial services | 2018 |
| Oystercatcher Properties Limited | Real estate | 2014 |
| Ozark Dispense Limited | Extraterritorial | 1995 |
| Ozark Enterprises Limited | Manufacturing | 1987 |
| Ozonemart Ltd | Wholesale & retail | 2023 |
| O’Brien Window Cleaning Ltd | Administrative & support | 2025 |
| P & D Northern Asset Management Limited | Financial services | 2020 |
| P & D Northern Group Limited | Financial services | 2020 |
| P & D Wright Joinery Ltd | Construction | 2020 |
| P & J Memorials Ltd | Administrative & support | 2006 |
| P & R Security Systems Limited | Administrative & support | 1999 |
| P & S Transport (Merseyside) Ltd | Information & communication | 1999 |
| P and S Care Limited Limited | Administrative & support | 2020 |
| P Barry Construction Ltd | Construction | 2023 |
| P Bennett Properties Limited | Households | 2016 |
| P C Warehouse UK Ltd | Information & communication | 2006 |
| P Kirwan Consulting Ltd | Professional & scientific | 2024 |
| P L C Media Limited | Professional & scientific | 2024 |
| P M I S Properties Limited | Households | 2025 |
| P M Leyland Limited | Construction | 2009 |
| P Restaurant Ltd | Manufacturing | 2021 |
| P V Beal & Co Ltd | Professional & scientific | 2021 |
| P&B Forest Service Ltd. | Agriculture & fishing | 2007 |
| P&F Couriers Ltd | Transport & logistics | 2021 |
| P&I Health Care Limited | Health & social care | 2025 |
| P&P Beauty World Ltd | Other services | 2026 |
| P&P Projects and Developments Ltd | Construction | 2025 |
| P-Wave Distributors Limited | Wholesale & retail | 2013 |
| P-Wave Ltd | Extraterritorial | 2022 |
| P. a. G Plumbing and Heating Ltd | Construction | 2024 |
| P. P Protube Limited | Professional & scientific | 2005 |
| P.& D.Northern Steels Limited | Wholesale & retail | 1957 |
| P.A.C.T. Services Limited | Manufacturing | 1999 |
| P.B. Code Ltd | Information & communication | 2021 |
| P.E.B Logistics Ltd | Transport & logistics | 2026 |
| P.P. Processing Limited | Manufacturing | 1974 |
| P.P. Profiles Limited | Manufacturing | 1976 |
| P.R. England & Sons Ltd. | Other services | 1996 |
| P.S. Love Your Money Limited | Financial services | 2018 |
| P18 Ltd | Real estate | 2025 |
| P3DP Ltd | Manufacturing | 2022 |
| PA Rothwell Plumbing and Heating Limited | Construction | 2008 |
| Pacific Financial Associates Ltd | Administrative & support | 2026 |
| Pacific Financial Partners Ltd | Administrative & support | 2026 |
| Pacific Financial Solutions Ltd | Financial services | 2015 |
| Pacs Real Estate Ltd | Construction | 2025 |
| PAD Construction Management Limited | Professional & scientific | 2011 |
| PAD Economics Ltd | Professional & scientific | 2011 |
| Padel Club Clothing Limited | Wholesale & retail | 2026 |
| Padel Fusion Ltd | Arts & recreation | 2025 |
| Padel Republic Oldham Limited | Arts & recreation | 2026 |
| PADEL247 Limited | Arts & recreation | 2026 |
| Pads Investments Limited | Real estate | 2013 |
| Paige Security Services Ltd | Administrative & support | 2010 |
| Painite Gaming Limited | Arts & recreation | 2022 |
| Paint Studio 360 Ltd | Wholesale & retail | 2023 |
| Painted Muse Studio Limited | Manufacturing | 2025 |
| PAK Kashmir News UK Limited | Information & communication | 2017 |
| PAK Real Estate Limited | Real estate | 2021 |
| Pakfoods Oldham Limited | Wholesale & retail | 2025 |
| Pakistan Journalists Union of UK Ltd | Health & social care | 2024 |
| Pakville Construction Ltd | Construction | 2022 |
| Paladino Ltd | Administrative & support | 2019 |
| Palin & Jones Interiors Ltd | Manufacturing | 2026 |
| Palladium Management Company Limited | Households | 2025 |
| Pallet People Ltd | Manufacturing | 2010 |
| Pallet-Track Manchester Ltd | Extraterritorial | 2016 |
| Palletman & Sons Ltd | Administrative & support | 2008 |
| Pallister Consultancy Limited | Professional & scientific | 2019 |
| Pallmm Commercial Ltd | Real estate | 2025 |
| Pallmm Estates Ltd | Real estate | 2022 |
| Palm Adolescent Services Ltd | Health & social care | 2025 |
| Palm Developments (Oldham) Limited | Construction | 1997 |
| Palm Oldham Ltd | Manufacturing | 2026 |
| Palop Ladies Cleaning Services Ltd | Administrative & support | 2025 |
| Pamari Signs Ltd | Manufacturing | 2023 |
| Pamfil Constructgo Ltd | Construction | 2025 |
| Pamper My Hair Ltd | Other services | 2017 |
| PAN Ajia Tradings Ltd | Hospitality | 2021 |
| PAN Amusements Operations Ltd | Arts & recreation | 2018 |