| MK Home & Family Ltd | Wholesale & retail | 2025 |
| MM Finance Group Ltd | Financial services | 2022 |
| MM Lasting Wish Ltd | Other services | 2022 |
| Modesta & Co. Ltd | Professional & scientific | 2016 |
| MOG Properties Limited | Real estate | 2021 |
| Mojo Pickups Ltd | Arts & recreation | 2012 |
| Molbo Limited | Professional & scientific | 2021 |
| Mollie's Beauty Ltd | Other services | 2019 |
| Moorside Ground Care Ltd | Administrative & support | 2021 |
| More Than Bricks & Mortar Ltd | Professional & scientific | 2015 |
| Moreton & Co Holdings Ltd | Financial services | 2025 |
| Mount Pleasant Farming Ltd | Energy | 2013 |
| Mrdm Ltd | Education | 2025 |
| Mrscruff's Limited | Hospitality | 2015 |
| Mtco Commissioning Services Limited | Construction | 2018 |
| Mum's Clean Limited | Administrative & support | 2026 |
| Mustard Restaurant Ltd | Hospitality | 2022 |
| My Good Trading Ltd | Wholesale & retail | 2025 |
| Mymglkon Limited | Wholesale & retail | 2024 |
| Mytr Projects Ltd | Construction | 2019 |
| Mytr Properties Ltd | Real estate | 2023 |
| N.G.S. Flooring Sundries Limited | Wholesale & retail | 1979 |
| Neatpro Solutions Ltd | Construction | 2025 |
| Neliveliy Feres Ltd | Wholesale & retail | 2024 |
| Nerd Nook Print & Pyro Ltd | Wholesale & retail | 2026 |
| Nestra Care Ltd | Extraterritorial | 2025 |
| Neuair Ltd | Construction | 2026 |
| New Wave Education Limited | Education | 2017 |
| Newblue Limited | | 1981 |
| Newburn Commercials Ltd | Wholesale & retail | 2019 |
| Newsholme Solutions Limited | Professional & scientific | 2008 |
| Nithiya Stores Limited | Wholesale & retail | 2021 |
| Nivaas Homes Ltd | Real estate | 2025 |
| NO 1 PA Ltd | Administrative & support | 2011 |
| Noble Christopherson Limited | Arts & recreation | 2018 |
| Noby UK Ltd | Manufacturing | 1992 |
| Nomadly Ltd | Hospitality | 2025 |
| North Dean Services Ltd | Real estate | 2002 |
| Northern Rave Scene Ltd | Hospitality | 2025 |
| Northern Theatre Arts Ltd | Arts & recreation | 2022 |
| Northgate Point (Management) Limited | Real estate | 2016 |
| Northgate Studios Management Limited | Real estate | 2018 |
| Northwind Renewable Services Ltd | Construction | 2019 |
| O. & W. Crawshaw Limited | Construction | 1956 |
| Oaken Clough Farm Limited | Households | 2025 |
| Ocean Learning Limited | Education | 2003 |
| Oily RAG Motorcycles Ltd | Wholesale & retail | 2025 |
| Old Bridge Inn Limited | Hospitality | 2008 |
| One Project Management Ltd | Professional & scientific | 2020 |
| Open Mind Gymnastricks Ltd | Arts & recreation | 2022 |
| Optimal Management Consultants Ltd | Professional & scientific | 2023 |
| ORD Building and Renovations Ltd | Construction | 2020 |
| Otter FM Ltd | Administrative & support | 2025 |
| Otterlee Farm Ltd | Agriculture & fishing | 2018 |
| Outdoor Revolution Ltd | Wholesale & retail | 2023 |
| Outhouse Norland Ltd | Hospitality | 2024 |
| Oxford Bingo (Bradford) Limited | Real estate | 1967 |
| P Booth and Sons Ltd | Construction | 2020 |
| PAC Asbestos Surveys Ltd | Professional & scientific | 2013 |
| Packaging World Limited | Administrative & support | 2001 |
| Paigey Piper Limited | Professional & scientific | 2021 |
| Park Road Food and Wine Store Ltd | Wholesale & retail | 2022 |
| Parnell Group (Holdings) Ltd | Financial services | 2025 |
| Paxton-White Limited | Professional & scientific | 2024 |
| Payridge Property Developments Ltd | Construction | 2026 |
| Pearson Builders Ltd | Construction | 2009 |
| Peekaboo Property Limited | Real estate | 2022 |
| Pennine Pharma Limited | Wholesale & retail | 2021 |
| Pennine Pharmaceuticals Limited | Wholesale & retail | 2018 |
| Pennine Project Services Ltd | Information & communication | 2019 |
| Pennine Specials Limited | Wholesale & retail | 2021 |
| Perform Digital Media Ltd | Professional & scientific | 2023 |
| Perseverance Property Ltd | Real estate | 2021 |
| Personalised Logos (Yorkshire) Ltd | Other services | 2021 |
| Peter Kerridge Plumbing and Heating Ltd | Construction | 2011 |
| Phil White Consultancy Ltd | Professional & scientific | 2019 |
| Piggyprint Ltd | Extraterritorial | 2015 |
| Pillitteri EYE Consult Ltd | Health & social care | 2021 |
| PME Consultancy Ltd | Administrative & support | 2021 |
| Pokers FUN Limited | Real estate | 2006 |
| Premier Homes (UK) Limited | Real estate | 2002 |
| Preston Partnership | | 2001 |
| Prestonscarandcleaning Ltd | Wholesale & retail | 2021 |
| Prima Premium Ltd | Arts & recreation | 2017 |
| Primal Media Yorkshire Limited | Arts & recreation | 2021 |
| Prime Driver Training Ltd | Education | 2025 |
| Primrose by Lisa Ltd | Wholesale & retail | 2021 |
| Primus Edge (Management) Limited | Real estate | 2016 |
| Primus Place (Management) Limited | Real estate | 2014 |
| Problem Bear Property Limited | Real estate | 2024 |
| Professional Administrators Ltd | Other services | 2017 |
| Progress Drinks Solutions Ltd | Information & communication | 2013 |
| Proper Digital Limited | Information & communication | 2018 |
| Propinvest Co Home Improvements Ltd | Construction | 2025 |
| Propinvest Co Property 2 Ltd | Real estate | 2024 |
| Propinvest Co Property Ltd | Real estate | 2024 |
| Proton (Southern) Limited | Wholesale & retail | 2004 |
| Provincial House (Bolton) RTM Company Limited | Households | 2026 |
| Psd-Engineers Ltd | Construction | 2018 |
| Pureai Limited | Information & communication | 2025 |