| Mathmindz Ltd | Education | 2025 |
| Matting Systems Limited | Professional & scientific | 1998 |
| Mattlou Limited | Manufacturing | 2011 |
| Mayfield Park Limited | Real estate | 2002 |
| MCJ Fabrications Limited | Manufacturing | 2013 |
| Meadow Skincare Ltd | Other services | 2024 |
| Mijan Holdings Ltd | Real estate | 2024 |
| Mindfulness Moments CIC | Health & social care | 2019 |
| Mintcress Properties Limited | Financial services | 2024 |
| Mishti Ltd | Hospitality | 2026 |
| Mission Homecare and Services Limited | Administrative & support | 2023 |
| Mixles Limited | Wholesale & retail | 2016 |
| MK Tuned Ltd | Wholesale & retail | 2025 |
| Moderna Living Ltd | Wholesale & retail | 2025 |
| Moorfields Electrical Limited | Construction | 2014 |
| Morley Electrical Ltd | Construction | 2019 |
| MR Trims Barber Ltd | Other services | 2024 |
| MT Technical Solutions Ltd | Construction | 2012 |
| Music Peace Connection CIC | Extraterritorial | 2024 |
| N K Electrical (Yorkshire) Ltd | Construction | 2024 |
| Nahata Limited | Wholesale & retail | 2023 |
| NAK (UK) Limited | Information & communication | 1994 |
| Naked Trading Limited | Wholesale & retail | 2002 |
| Nathan Eastell Design Ltd | Professional & scientific | 2026 |
| National Build Limited | Construction | 2016 |
| National Floorcoverings Group Limited | Professional & scientific | 2011 |
| National Floorcoverings Holdings Limited | Professional & scientific | 2002 |
| National Floorcoverings Limited | Manufacturing | 1955 |
| Natural Herbal Drink Ltd | Manufacturing | 2019 |
| Naylors Court (Roberttown) Limited | Households | 1999 |
| Newsmith Stainless Holdings Limited | Financial services | 2017 |
| Newsmith Stainless Limited | Manufacturing | 1969 |
| NIC & Co Cleaning Services Ltd | Administrative & support | 2023 |
| Nic-Knock Holdings Ltd | Financial services | 2025 |
| NID Services Ltd | Transport & logistics | 2022 |
| Nigel Rothery HGV Driver Hire Limited | Transport & logistics | 2014 |
| NJ Site Services Limited | Professional & scientific | 2013 |
| Non-Stop Transport (Yorkshire) Ltd | Transport & logistics | 2023 |
| Northern Scene Limited | Construction | 2022 |
| Northfields Liversedge Ltd | Education | 2021 |
| Northfields Nursery Limited | Education | 2018 |
| Novasight Ltd | Administrative & support | 2025 |
| Novl Studio Ltd | Professional & scientific | 2023 |
| NU Cleaners Limited | Administrative & support | 2017 |
| NU Law & Legal Services Limited | Other services | 2017 |
| OBP Fabrications Limited | Administrative & support | 2017 |
| OBP Utilities Ltd | Administrative & support | 2020 |
| Octopoda Innovations Ltd | Professional & scientific | 2019 |
| Oeasy Travel Ltd | Wholesale & retail | 2025 |
| OFF Streets on Sports Ltd | Manufacturing | 2026 |
| Ojin Energy Drink Ltd | Manufacturing | 2019 |
| Oldfield Assessors Ltd | Administrative & support | 2017 |
| Oliver Douglas Limited | Extraterritorial | 1987 |
| ON Board Power Ltd | Administrative & support | 2011 |
| Opal Construction Ltd | Construction | 2022 |
| Opulence Beds Group Ltd | Wholesale & retail | 2026 |
| Opulence Beds Ltd | Extraterritorial | 2026 |
| OR8 Wellness Ltd | Wholesale & retail | 2018 |
| Owen Electrical Domestic Services Limited | Construction | 2025 |
| Owens Corning Fiberglas (U.K.) Pension Plan Ltd. | Professional & scientific | 1987 |
| Owens Corning Supplementary Pension Plan Limited | Professional & scientific | 2013 |
| Owens-Corning Britinvest Limited | Professional & scientific | 2000 |
| Owens-Corning Veil U.K. Ltd. | Manufacturing | 1951 |
| Packturn Limited | Extraterritorial | 1989 |
| Pani Poori by Noor Limited | Transport & logistics | 2025 |
| Paragon Carpets and Tiles Limited | Professional & scientific | 1997 |
| Park View Court Commonhold Association Ltd | Households | 2018 |
| Parkers Windows Ltd | Manufacturing | 2024 |
| Parmars (Liversedge) Ltd | Hospitality | 2025 |
| Passion Properties & Services Ltd | Real estate | 2026 |
| Pat-Ade IT Services Ltd | Information & communication | 2014 |
| Patterntech Limited | Manufacturing | 2017 |
| Paul Frost (Gomersal) Limited | Professional & scientific | 2020 |
| Peaceful Pet Farewells Ltd | Professional & scientific | 2020 |
| Peak Tech Engineering Services Ltd | Professional & scientific | 2018 |
| Penguin Team Coaching Limited | Professional & scientific | 2024 |
| Peony IT Consulting Ltd | Information & communication | 2021 |
| Personal Injury Marketing Ltd | Other services | 2012 |
| PF Contractor Services Ltd | Construction | 2025 |
| Pharmacist 4U Ltd | Health & social care | 2022 |
| PHYSIO4KIDS Limited | Health & social care | 2007 |
| Pickles GAS Engineers Ltd | Manufacturing | 2025 |
| Pickup and Go Ltd | Transport & logistics | 2020 |
| Pizza Shaks Ltd | Hospitality | 2023 |
| Planet Baby Love Ltd | Wholesale & retail | 2020 |
| Plantsheba Ltd | Wholesale & retail | 2023 |
| Play-Rite Limited | Professional & scientific | 1991 |
| PLS Services (Yorkshire) Limited | Wholesale & retail | 2010 |
| Plush Home Furniture Ltd | Wholesale & retail | 2022 |
| Ponderosa Business Park Services Limited | Real estate | 2019 |
| Ponderosa Holdings Ltd | Other services | 2022 |
| Ponderosa Rural ZOO Limited | Arts & recreation | 2026 |
| Ponderosa ZOO Ltd | Arts & recreation | 2023 |
| Porterhouse Fitness Ltd | Arts & recreation | 2026 |
| Prestige Driver Hire Ltd | Transport & logistics | 2026 |
| Prime Associates (Yorkshire) Limited | Administrative & support | 2013 |
| Prime Life Labs Ltd | Information & communication | 2024 |
| Princi Ltd | Information & communication | 2006 |
| Pro-Glaze Limited | Construction | 2003 |
| Prom and Wedding Car Hire Ltd | Administrative & support | 2021 |