| Mobile Sales Ltd | Wholesale & retail | 2023 |
| Mobility Events & Services Ltd | Wholesale & retail | 2025 |
| Modern Woollens UK Limited | Wholesale & retail | 2024 |
| Modules PM Limited | Professional & scientific | 2018 |
| Monkman Physiotherapy Ltd | Health & social care | 2019 |
| Morgan Anaesthetic Services Ltd | Health & social care | 2019 |
| Morse Coding Ltd | Information & communication | 2011 |
| Motion by TOM Limited | Information & communication | 2023 |
| Move and Learn Community Interest Company | Education | 2017 |
| Mrconnectivity Limited | Professional & scientific | 2009 |
| Mulligans of Bingley Ltd | Hospitality | 2024 |
| Muse Beauty Clinic Ltd | Other services | 2025 |
| MW Taste Limited | Hospitality | 2020 |
| My Property Group Limited | Real estate | 2015 |
| N&K Morris Transport Limited | Transport & logistics | 2014 |
| Nathaniel Peacock Limited | Health & social care | 2003 |
| Nathwani & Raycha Ltd | Health & social care | 2019 |
| Natural Fibres Limited | Professional & scientific | 1991 |
| Nautilux Bathrooms Ltd | Construction | 2024 |
| Nazman Developments Ltd | Construction | 2016 |
| Nazman Holdings Limited | Construction | 2007 |
| NC Roofing & Building Limited | Construction | 2023 |
| Neil Bishop Landscapes Ltd | Administrative & support | 2025 |
| Nelley and Noah Ltd | Wholesale & retail | 2026 |
| Nevis Computers Limited | Manufacturing | 1997 |
| New & Used Kart Components Limited | Arts & recreation | 2023 |
| New Stone Sales Ltd | Administrative & support | 2015 |
| Nexlink Data Solutions Limited | Administrative & support | 2026 |
| Nextgen Sports Clubs Ltd | Education | 2024 |
| NG Close Protection Security Services Ltd | Administrative & support | 2024 |
| NG Software Limited | Information & communication | 2017 |
| Nic's Nutrition Ltd | Health & social care | 2016 |
| Nicola Cleaver Ltd | Professional & scientific | 2025 |
| Niravandnyra Ltd | Health & social care | 2024 |
| NKH Property Services Ltd | Construction | 2021 |
| North Central GAS Services Limited | Professional & scientific | 2015 |
| North Star Public Affairs Ltd | Professional & scientific | 2015 |
| Northern Garden Rooms Ltd | Construction | 2020 |
| NU Wave Limited | Financial services | 2022 |
| Numu Properties Limited | Real estate | 2025 |
| Nutri Science UK Limited | Wholesale & retail | 2026 |
| Nutribloom Ltd | Health & social care | 2025 |
| O Jarvis Limited | Administrative & support | 2019 |
| O'Neill Construction (Yorkshire) Ltd | Construction | 2019 |
| Oak Glen Property Limited | Construction | 2017 |
| Oak Z Property Ltd | Real estate | 2025 |
| Oakleaf Investments Limited | Real estate | 2015 |
| Oakridge Outdoor Solutions Ltd | Administrative & support | 2025 |
| Ocean Park Developments Limited | Administrative & support | 1973 |
| Ockerby Academy Ltd | Arts & recreation | 2020 |
| Olifin Solutions Limited | Information & communication | 2019 |
| Oliveanimals Ltd | Professional & scientific | 2025 |
| Oliver Edwards Catering Ltd | Hospitality | 2025 |
| Oliver Rocco Holdings Limited | Real estate | 2018 |
| Olivialaw Limited | Professional & scientific | 2024 |
| OMM Holdings Limited | Real estate | 2021 |
| Onist Arts Ltd | Wholesale & retail | 2025 |
| Optimise Together Limited | Information & communication | 2025 |
| Orchestral Percussion Limited | Arts & recreation | 2019 |
| P Harris Windows and Doors Limited | Construction | 2018 |
| P Roadshow Ltd | Wholesale & retail | 2023 |
| Park Homes (NW) Ltd | Health & social care | 2021 |
| Park Homes (SCT) Ltd | Health & social care | 2021 |
| Park Homes EOT Limited | Administrative & support | 2026 |
| Parker - Evans Ltd | Manufacturing | 2026 |
| Parkers Motorhome Services Ltd | Manufacturing | 2023 |
| PB Bar Ltd | Hospitality | 2025 |
| PB Foods Yorkshire Ltd | Hospitality | 2025 |
| PBS Synergies Limited | Professional & scientific | 2016 |
| Peaker Accounting Limited | Professional & scientific | 2012 |
| Penico Gauges Limited | Manufacturing | 1999 |
| Pennine Building Solutions Limited | Other services | 1993 |
| Pentway Property Solutions Limited | Construction | 2021 |
| Phakey Properties Limited | Real estate | 2022 |
| Pharmalink Solutions Limited | Wholesale & retail | 2008 |
| Phase Electrical Solutions Yorkshire Limited | Construction | 2024 |
| Philip Sinclair Managed Services Limited | Information & communication | 2011 |
| Phoenix Takton Ltd | Manufacturing | 2024 |
| Pick Programme CIC | Education | 2025 |
| Pineword Limited | Education | 1995 |
| Pink INK Media Limited | Information & communication | 2021 |
| Pioneer Risk Limited | Financial services | 2023 |
| PJR 53 Ltd | Real estate | 2024 |
| Planmac UK Limited | Agriculture & fishing | 2006 |
| PLG Aquatics Limited | Wholesale & retail | 2017 |
| Plum Tree Properties Limited | Real estate | 2014 |
| PM Collections Limited | Arts & recreation | 2018 |
| PND Management Limited | Professional & scientific | 2025 |
| Pocketgpsworld.Com Ltd | Information & communication | 2003 |
| Polymath Systems Limited | Professional & scientific | 2025 |
| Pondermatters Limited | Financial services | 1999 |
| Poosie Productions Ltd | Information & communication | 2019 |
| Ppnm UK Limited | Wholesale & retail | 2025 |
| PPY Advisory & Consulting Ltd | Professional & scientific | 2026 |
| Precision Pipe Supports Limited | Manufacturing | 2002 |
| Prestige Haulage Group Ltd | Transport & logistics | 2025 |
| Prestons Flooring Limited | Construction | 2026 |
| Primary Training Limited | Education | 2019 |
| Prime Export UK Ltd | Wholesale & retail | 2020 |
| Prime Point Services Ltd | Real estate | 2025 |