| Metal Working Lubricants Limited | Manufacturing | 1956 |
| MG Roofing & Services Ltd | Construction | 2023 |
| Michael Pooler Associates Limited | Professional & scientific | 2013 |
| Michelle Procter Limited | Financial services | 2011 |
| Mideh Ltd | Information & communication | 2025 |
| Millies Meal Preps Limited | Manufacturing | 2025 |
| Mindworks Inc Limited | Information & communication | 2002 |
| Minecrest Limited | Information & communication | 2016 |
| Mint Vans Ltd | Wholesale & retail | 2013 |
| MJP Consulting Northwest Limited | Administrative & support | 2014 |
| Mobol Ventures Limited | Wholesale & retail | 2016 |
| Mogro Ltd | Wholesale & retail | 2016 |
| Moore Property Investment Co Limited | Real estate | 1993 |
| Moss Meadow Farm Ltd | Agriculture & fishing | 2018 |
| Motorsport Upholstery Ltd | Wholesale & retail | 2024 |
| Mount Green Agencies Limited | Wholesale & retail | 1970 |
| Mount Green Holdings Limited | Wholesale & retail | 2021 |
| MPT Group Mattress Machinery Ltd | Manufacturing | 2023 |
| MR Jelby Entertainment Ltd | Arts & recreation | 2024 |
| MSC & James Grace Developments Ltd | Construction | 2021 |
| MSC JG Lettings Ltd | Real estate | 2025 |
| MSC Lettings Ltd | Real estate | 2020 |
| MSC Superstore Ltd. | Wholesale & retail | 2018 |
| MT Household Limited | Wholesale & retail | 2025 |
| Mughals Transport Ltd | Transport & logistics | 2023 |
| My CUE Ltd | Information & communication | 2023 |
| N Murray Construction Ltd. | Construction | 2015 |
| Narfy Media Services Limited | Administrative & support | 2020 |
| Nat-Lee Property Ltd | Real estate | 2023 |
| Natalie Stenson Ltd | Health & social care | 2019 |
| Natural Aesthetics by ZLS Ltd | Other services | 2021 |
| Naturefyt Ltd | Education | 2024 |
| Neckpro Ltd | Wholesale & retail | 2010 |
| Nethra Care Limited | Health & social care | 2024 |
| Nevola Limited | Professional & scientific | 2020 |
| Newchurch Local Ltd | Wholesale & retail | 2024 |
| Nick Knight Limited | Construction | 2003 |
| Nick Wadsworth Sport Psychology Limited | Education | 2019 |
| Nicola J. Parker Therapy Ltd | Health & social care | 2022 |
| Nonan Burger Ltd | Hospitality | 2023 |
| Northern Originals Ltd | Wholesale & retail | 2020 |
| Northern Plasterboard Recycling Ltd | Water & waste | 2018 |
| Numorith Ltd | Transport & logistics | 2021 |
| NWD 4X4 Ltd | Wholesale & retail | 2017 |
| NWD Developers Ltd | Construction | 2025 |
| Oak at Bacp Ltd | Hospitality | 2025 |
| Oak Investment Limited | Real estate | 2000 |
| Oakfield Paxton Limited | Professional & scientific | 2023 |
| Oaks & Acres Ltd | Real estate | 2025 |
| Ocean Bathrooms & Kitchens Maintenance Ltd | Construction | 2021 |
| Oliver & Jones Ltd | Manufacturing | 2023 |
| Oliver Maison Ltd | Wholesale & retail | 2024 |
| OP Acquisitions Limited | Manufacturing | 2013 |
| OPA Estates Ltd | Real estate | 2024 |
| Orchard Furniture Recycling Ltd | Water & waste | 2023 |
| Orthoplastics Limited | Manufacturing | 2005 |
| Orthoproducts Limited | Manufacturing | 2008 |
| Otter Creek Co-Owners Limited | Hospitality | 2003 |
| P.H Finishing Contractors Ltd | Construction | 2024 |
| Page Transport Solutions Ltd | Transport & logistics | 2019 |
| Palatine Hill Limited | Professional & scientific | 2020 |
| Patrix Consultancy Limited | Information & communication | 2018 |
| Pawsitive Dog Walking & Training Ltd | Agriculture & fishing | 2025 |
| Pennine Land Rover Club Limited | Arts & recreation | 1978 |
| Pennine Pathways Limited | Health & social care | 2026 |
| Peter Flanagan Transport Limited | Transport & logistics | 2018 |
| Peter Lewis Trading Ltd | Hospitality | 2023 |
| Phoenix Personalised Software Ltd | Information & communication | 2019 |
| Photogenix Ltd. | Information & communication | 2024 |
| Phythian Logistics Limited | Transport & logistics | 2019 |
| Pioneer GAS Co Limited | Wholesale & retail | 2008 |
| Pizza Costa Ltd | Hospitality | 2019 |
| PJE SET and Rigging Services Ltd | Arts & recreation | 2019 |
| PJS Invasive Species Control Limited | Professional & scientific | 2025 |
| Planet of the Vapez Ltd | Wholesale & retail | 2025 |
| Platinum Pipework Ltd | Manufacturing | 2025 |
| PLS 2023 Limited | Professional & scientific | 2023 |
| PNY Property Lettings Limited | Real estate | 2025 |
| POD Queen Ltd | Health & social care | 2025 |
| Postglade Ltd | Transport & logistics | 2008 |
| PR Fire Engineering Limited | Construction | 2015 |
| Pressure Works Ltd | Administrative & support | 2025 |
| Procreorate Ltd | Transport & logistics | 2021 |
| Productsave Limited | Wholesale & retail | 2013 |
| Profluency Ltd | Wholesale & retail | 2024 |
| Project Burger UK Limited | Hospitality | 2025 |
| Pumirarts Ltd | Transport & logistics | 2021 |
| Purple Moon Mystics Ltd | Wholesale & retail | 2025 |
| Quick-Pitch Sports Ltd | Education | 2024 |
| Quicks Freighthaul Limited | Transport & logistics | 2002 |
| Quinex Ltd | Manufacturing | 2019 |
| R & J Property Holdings Ltd | Real estate | 2025 |
| R a Carter Excavations & Groundwork Ltd | Construction | 2020 |
| R&D Prestige Properties Ltd | Real estate | 2024 |
| Rahoffshore Ltd | Mining & quarrying | 2025 |
| Ralston Transport (Paisley) Limited | Extraterritorial | 1964 |
| Rammies Bargain Bags Ltd | Wholesale & retail | 2026 |
| Random Dent Limited | Professional & scientific | 2025 |
| Rapidbusinessmodeling Ltd. | Professional & scientific | 2005 |
| Ratcliffe Environmental Consultancy Ltd | Professional & scientific | 2023 |