| Leodis Games Limited | Wholesale & retail | 2018 |
| Letsby Avenue (North) Ltd | Real estate | 2024 |
| Letsby Avenue (Yorkshire) Limited | Real estate | 2014 |
| Licence Trade Consultants Limited | Professional & scientific | 2013 |
| Life and Care Chiropractic Ltd | Other services | 2011 |
| Life for Drive Limited | Transport & logistics | 2016 |
| Lifeline Care Ltd | Health & social care | 2010 |
| Lifetime Windows and Doors Limited | Manufacturing | 2018 |
| Lighthouse Therapy Hub Limited | Health & social care | 2026 |
| Lili of the Valley Limited | Wholesale & retail | 2008 |
| Lilliard Consultancy Ltd | Information & communication | 2023 |
| LINK88CARPENTRY Ltd | Construction | 2021 |
| Linkmill Limited | Information & communication | 2015 |
| Little Lamb Consultancy Limited | Extraterritorial | 2022 |
| Littlemighty Limited | Arts & recreation | 2013 |
| Liucija Limited | Wholesale & retail | 2025 |
| Live and Wild Limited | Information & communication | 2021 |
| LK Escape Limited | Arts & recreation | 2017 |
| LK Gardens (Leeds) Ltd | Administrative & support | 2024 |
| LMS Geomatics & Engineering Ltd | Professional & scientific | 2023 |
| LNH Holdings Yorkshire Ltd | Financial services | 2025 |
| Local Comms Ltd | Information & communication | 2025 |
| Lodore Holdings Ltd | Real estate | 2018 |
| London Tags International Ltd | Professional & scientific | 2025 |
| London World Records Limited | Other services | 2019 |
| Longevity+ Ltd | Health & social care | 2024 |
| Lotus Legacy Project Ltd | Professional & scientific | 2026 |
| Love Farsley CIC | Arts & recreation | 2024 |
| Loved Pets Ltd | Other services | 2024 |
| Lowtown by Dalton & Co Ltd | Other services | 2021 |
| LS Mktn Ltd | Professional & scientific | 2025 |
| LSW London Ltd. | Wholesale & retail | 2017 |
| LT Commercial Services Ltd | Wholesale & retail | 2023 |
| Luck DEE Ltd | Hospitality | 2024 |
| Luigi Streetfood Ltd | Hospitality | 2022 |
| Luma & Line Atelier Ltd | Manufacturing | 2025 |
| Lumines Derma Ltd | Health & social care | 2024 |
| Luther Logistics Ltd | Wholesale & retail | 2024 |
| Luxone Design Limited | Professional & scientific | 2021 |
| LW Steel Services Ltd | Manufacturing | 2026 |
| LXP Limited | Administrative & support | 2025 |
| M & R Building Contractors Ltd | Construction | 2021 |
| M Gallagher Homes Ltd | Construction | 2016 |
| M Gallagher Properties Ltd | Real estate | 2022 |
| M Malik Properties Ltd | Real estate | 2025 |
| M. Gallagher (Civil Engineering) Limited | Construction | 1996 |
| M. Gallagher (Plant Hire) Limited | Administrative & support | 2000 |
| M. Hock Joinery & Building Services Limited | Construction | 2024 |
| M.R. Holdings Limited | Real estate | 2016 |
| M.T.M.S. Limited | Wholesale & retail | 2005 |
| M4 Leisure Limited | Administrative & support | 2026 |
| MAC Brothers Ltd | Hospitality | 2024 |
| Maemara Limited | Wholesale & retail | 2019 |
| MAF Capital Ltd | Financial services | 2025 |
| MAG Services MS Ltd | Transport & logistics | 2020 |
| Magma Healthcare Ltd | Wholesale & retail | 2024 |
| Mahony Estates Limited | Real estate | 2011 |
| Major Finance Limited | Real estate | 2018 |
| Make IT POP Events Ltd | Wholesale & retail | 2025 |
| Malcolm Goodall Associates Ltd | Professional & scientific | 2018 |
| Manchester City Soulville DEN Ltd | Real estate | 2024 |
| Manu Local PVT Ltd | Wholesale & retail | 2024 |
| MAP CNC Services Limited | Manufacturing | 2018 |
| Marcus Limited | Information & communication | 1982 |
| Marketing Salt Ltd | Information & communication | 2019 |
| Marlos Pizza Ltd | Hospitality | 2021 |
| Marsh (Pudsey) Ltd | Hospitality | 2025 |
| Marsh Projects (Leeds) Ltd | Construction | 2026 |
| Martha L Judge Ltd | Construction | 2019 |
| MAS Palm NET Ltd | Information & communication | 2018 |
| Match Systems Limited | | 1986 |
| Matherworks Ltd | Information & communication | 2024 |
| Maths Cloud Limited | Education | 2015 |
| Matk Property Ltd | Real estate | 2021 |
| Maverick and Co Consultancy Ltd | Administrative & support | 2025 |
| Mavibex Company Ltd | Hospitality | 2018 |
| MAX Vantage Ltd | Wholesale & retail | 2014 |
| MB Sports Solutions Ltd | Arts & recreation | 2026 |
| MBZ Properties Ltd | Real estate | 2025 |
| MC Service Charge Limited | Real estate | 2023 |
| MCC Training and Assessment Limited | Education | 2018 |
| MCS Engineering & Design Ltd | Construction | 2012 |
| MD INT Ltd | Other services | 2020 |
| MDB13 Ventures Ltd | Financial services | 2025 |
| Mddp Digital Limited | Information & communication | 2025 |
| MDR Electrical Services Limited | Professional & scientific | 2009 |
| ME Casa SU Casa Ltd | Real estate | 2024 |
| Meatup Kebab Limited | Hospitality | 2026 |
| Mental Ease Creative Ltd | Health & social care | 2023 |
| MER Global Limited | Wholesale & retail | 2020 |
| Merchant House SUB Ltd | Real estate | 2023 |
| Merline Healthcare Ltd | Health & social care | 2014 |
| Merline Properties Limited | Real estate | 2021 |
| Metabian Ltd | Wholesale & retail | 2021 |
| Mexbis Property Ltd | Real estate | 2016 |
| MGM Scaffolding Limited | Construction | 2026 |
| MH Interior Designs Ltd | Wholesale & retail | 2023 |
| Mhdh Limited | Real estate | 2023 |
| MI & SW PUB Ltd | Hospitality | 2025 |
| MIAL8 Group Limited | Professional & scientific | 2026 |