| KSF Normanton Limited | Hospitality | 2014 |
| KSO Properties Ltd | Real estate | 2016 |
| KTS Homes Limited | Hospitality | 2025 |
| L Booth Limited | Administrative & support | 2024 |
| L F & E Refrigerated Transport Limited | Administrative & support | 2008 |
| L T Jointing Ltd | Construction | 2015 |
| L&M Mini Market Limited | Wholesale & retail | 2023 |
| L.Bazanini Joinery and Construction Ltd | Manufacturing | 2026 |
| Land & Law Limited | Information & communication | 2016 |
| Last Trip Advisor (Funeral Services and Reviews) Ltd | Information & communication | 2018 |
| Layson Lettings Ltd | Real estate | 2026 |
| Leeds Youth Opera | Education | 2010 |
| Leman International Transport Limited | Transport & logistics | 2009 |
| Lenkar Ltd | Transport & logistics | 2020 |
| Leon's Supermarket Ltd | Wholesale & retail | 2020 |
| Lfsf Property Portfolio Ltd | Real estate | 2023 |
| LG Floor Coverings Ltd | Wholesale & retail | 2026 |
| Lifetime Planning Services Ltd | Other services | 2012 |
| Light Hire Limited | Extraterritorial | 2012 |
| LIL J Ltd | Information & communication | 2024 |
| Limbert Developments Limited | Construction | 2010 |
| Limitless Cricket Management Ltd | Arts & recreation | 2023 |
| Liquico TLL Limited | Transport & logistics | 2011 |
| Loscoe Investments Ltd | Financial services | 2016 |
| Lovewell Family Co Ltd | Education | 2025 |
| LT Property (Yorkshire) Ltd | Real estate | 2020 |
| Lucky Dragon Normanton Ltd | Hospitality | 2026 |
| Ludwell Electrical Limited | Construction | 2006 |
| Ludwell Electrical Services Limited | Construction | 2015 |
| Lukbar Ltd | Professional & scientific | 2026 |
| M & M Civil Engineering Ltd | Construction | 2015 |
| M & M Plant Hire (Leeds) Ltd | Administrative & support | 2015 |
| M B Solutions&Construction Ltd | Construction | 2019 |
| M Dumitru Trans Ltd | Transport & logistics | 2019 |
| M&A Pharmacies Group Limited | Financial services | 2018 |
| M&A Pharmacies Ltd | Wholesale & retail | 1987 |
| M&A Rental Properties Limited | Real estate | 2018 |
| M.R.Perkins Security & Electrical Limited | Construction | 2003 |
| Magpie Automotive Solutions Limited | Wholesale & retail | 2023 |
| Magpie Diagnostic Solutions Limited | Wholesale & retail | 2023 |
| Maisie Rollinson Design Ltd | Professional & scientific | 2026 |
| Making IT Make Sense Ltd | Professional & scientific | 2025 |
| Malwina Lindemann LCF Crossfit Ltd | Health & social care | 2026 |
| Manufacturing Consultants Ltd | Professional & scientific | 2023 |
| Marcin Pecz Ltd | Transport & logistics | 2016 |
| Mardon 45 Limited | Transport & logistics | 2015 |
| Marius Line Ltd | Transport & logistics | 2018 |
| Marius Transport Ltd | Transport & logistics | 2014 |
| Mark Newton Photography Ltd | Professional & scientific | 2019 |
| Marsona Ltd | Water & waste | 2021 |
| MB Mckay Ltd | Real estate | 2025 |
| MCK Holdings Limited | Real estate | 2020 |
| MD Global Properties Ltd | Real estate | 2015 |
| Memory Foam Warehouse Limited | Extraterritorial | 2015 |
| Mercaprime Ltd | Wholesale & retail | 2025 |
| Meta Electric Limited | Wholesale & retail | 2008 |
| Metaka Ltd | Transport & logistics | 2019 |
| Metaridge Holdings Ltd | Financial services | 2015 |
| Metavaris Ltd | Wholesale & retail | 2026 |
| MGM Trans Ltd | Transport & logistics | 2021 |
| Mhkw Limited | Information & communication | 2020 |
| MICHAELWATERS1986 Ltd | Transport & logistics | 2025 |
| Michelangelo's Wakefield Ltd | Hospitality | 2023 |
| Midas Motors Ltd | Wholesale & retail | 2024 |
| Milicja Ltd | Other services | 2018 |
| Millward Scaffolding Group Limited | Financial services | 2025 |
| Millward Scaffolding Limited | Construction | 2008 |
| Mistrzostwa UK Ltd | Arts & recreation | 2024 |
| Mivonne Ltd | Financial services | 2012 |
| MJ PUB Management Ltd | Professional & scientific | 2025 |
| MLC Coaching Ltd | Health & social care | 2026 |
| Mobile Tyres Fitting Yorkshire Ltd | Wholesale & retail | 2026 |
| Modular Hire Nationwide Limited | Extraterritorial | 2017 |
| Moon Jupiter Limited | Information & communication | 2005 |
| Moran Rides International Limited | Other services | 2021 |
| MPC (Wakefield) Limited | Construction | 2014 |
| MPM Bullion Limited | Wholesale & retail | 2011 |
| MR Barber Normanton Ltd | Other services | 2023 |
| MRS P Events Ltd | Hospitality | 2017 |
| MTC Property Investments Limited | Real estate | 2006 |
| Murhaps Ltd | Wholesale & retail | 2020 |
| Musgrave Developments Ltd | Construction | 2018 |
| My CUP of Tea (Altofts) Ltd | Hospitality | 2019 |
| N FOX Transport Limited | Transport & logistics | 2013 |
| N Townend Window Cleaning Ltd | Administrative & support | 2023 |
| Name Enterprise Ltd | Information & communication | 2023 |
| NCC Hand Car Wash Ltd | Wholesale & retail | 2021 |
| NCP Enterprises Limited | Professional & scientific | 2023 |
| Networks Decoded Ltd | Information & communication | 2025 |
| New Collaborative Learning Trust | Education | 2014 |
| NEWCO1234 Ltd | Information & communication | 2025 |
| Newport Land and Law Limited | Professional & scientific | 2016 |
| Nexans Power Accessories (UK) Ltd | Manufacturing | 1990 |
| Next Door Reality Ltd | Households | 2025 |
| Nhlanhlo Ltd | Health & social care | 2026 |
| NLM Properties Ltd | Construction | 2022 |
| Nnesco Cuisine Limited | Hospitality | 2025 |
| NO Masters Co-Operative Limited | Information & communication | 1990 |
| Normandy Park Property Limited | Real estate | 2008 |
| Normanton Blades & Cuts Ltd | Other services | 2026 |