| Loom Factor Limited | Information & communication | 2024 |
| Lord ADL Wraith Noor Ltd | Real estate | 2025 |
| Lotusesuk Ltd | Health & social care | 2023 |
| LOU & LEE Hospitality Holdings Limited | Hospitality | 2026 |
| Lounge 117 Ltd | Hospitality | 2024 |
| Loungr Ltd | Wholesale & retail | 2025 |
| Lowther Decorators Limited | Construction | 2002 |
| Loxley Beds Limited | Manufacturing | 2025 |
| LP Property Maintenance (Yorkshire) Ltd | Construction | 2024 |
| LS Dental Ltd | Health & social care | 2025 |
| LTL Property Management (Yorkshire) Ltd | Real estate | 2023 |
| Lucas Properties Limited | Real estate | 2009 |
| Lucas Properties LLP | | 2007 |
| Lucid Point Media Limited | Information & communication | 2025 |
| Lucky Beds Ltd | Wholesale & retail | 2025 |
| Lucky Rabbit Property Ltd | Real estate | 2023 |
| Luev Ltd | Other services | 2020 |
| Luma Mechanical Ltd | Construction | 2019 |
| Lumiva Grid Limited | Construction | 2025 |
| Lunar Capital & Management Consultants Ltd. | Financial services | 2022 |
| Lusha Ecom Traders Ltd | Wholesale & retail | 2025 |
| Lusso Design Developments Ltd | Households | 2025 |
| LUV Marketing Ltd | Professional & scientific | 2025 |
| LUV to Travel Limited | Administrative & support | 2019 |
| Luxe Auto's (Yorkshire) Ltd | Wholesale & retail | 2023 |
| Luxe Barrat Limited | Information & communication | 2024 |
| Luxe Mattress Ltd | Manufacturing | 2024 |
| Luxe Slumber Craft Ltd | Manufacturing | 2023 |
| Luxirium Ltd | Wholesale & retail | 2025 |
| Luxistic Beds Ltd | Wholesale & retail | 2021 |
| Luxrite Lighting Limited | Manufacturing | 2016 |
| Luxs Home Ltd | Manufacturing | 2022 |
| Luxtyn Beds Ltd | Wholesale & retail | 2026 |
| Luxurious Nights Ltd | Manufacturing | 2018 |
| Luxury Designs Limited | Manufacturing | 2021 |
| Luxury LED Lighting Ltd | Wholesale & retail | 2020 |
| Luxury Village Ltd | Manufacturing | 2025 |
| M & C Commercial Services Ltd | Wholesale & retail | 2021 |
| M & M EYE Care Ltd | Other services | 2012 |
| M & M Rental Properties Ltd | Real estate | 2025 |
| M & S Farming Limited | Real estate | 2023 |
| M a Properties Yorkshire Limited | Real estate | 2016 |
| M Ahmad Health Ltd | Health & social care | 2024 |
| M Bhana Associates Limited | Professional & scientific | 2018 |
| M Black Joinery Ltd | Construction | 2019 |
| M Dadibhai Ltd | Health & social care | 2018 |
| M E Trading Limited | Wholesale & retail | 2018 |
| M H Electrical (Dewsbury) Ltd | Construction | 2005 |
| M H Healthcare Services Ltd | Health & social care | 2005 |
| M K Property Developers Limited | Agriculture & fishing | 2012 |
| M M Optical Limited | Health & social care | 2021 |
| M Nisar Ltd | Manufacturing | 2026 |
| M R Gondal Travels Ltd | Transport & logistics | 2023 |
| M Roberts Electrical Ltd | Construction | 2015 |
| M S Furnishings Ltd | Manufacturing | 2023 |
| M S Hussain Holdings Limited | Financial services | 2025 |
| M Sales Ltd | Wholesale & retail | 2025 |
| M U Contracting Ltd | Administrative & support | 2015 |
| M&A Graphics Ltd | Professional & scientific | 2024 |
| M&A Khan Limited | Wholesale & retail | 2025 |
| M&A Private Hire Ltd | Transport & logistics | 2024 |
| M&E Delivery Limited | Transport & logistics | 2025 |
| M&Eco Ltd | Construction | 2024 |
| M&G Convenience Store Ltd | Wholesale & retail | 2022 |
| M&I Trading Limited | Administrative & support | 2012 |
| M&Kb Services Ltd. | Administrative & support | 2012 |
| M&M Ophthalmics Ltd | Health & social care | 2022 |
| M&R Electrical Holdings Ltd | Construction | 2015 |
| M&S Clean Experts Ltd | Administrative & support | 2025 |
| M. Leveridge Kitchens & Bathrooms Limited | Construction | 2013 |
| M.R - Motors (West Yorkshire) Ltd | Wholesale & retail | 2021 |
| M.Z Markets Ltd | Wholesale & retail | 2022 |
| MA Auto Motors Ltd | Wholesale & retail | 2023 |
| MA Logistics (Dewsbury) Ltd | Transport & logistics | 2024 |
| MAA Consultants (Yorkshire) Ltd | Other services | 2025 |
| MAB Prime Store Ltd | Wholesale & retail | 2025 |
| Mabey Hire Limited | Administrative & support | 2009 |
| MAC Private Psychiatry Limited | Health & social care | 2011 |
| MAC Support Solutions Ltd | Other services | 2015 |
| Macros Wholesale Limited | Wholesale & retail | 2021 |
| MAD Palace Ltd | Information & communication | 2020 |
| Madani Investments Group Ltd | Real estate | 2026 |
| Madani Memorials Limited | Manufacturing | 2015 |
| Madhuri Medical Ltd | Professional & scientific | 2018 |
| Madni Kutub Khana Ltd | Wholesale & retail | 2014 |
| Madni Welfare Foundation (MWF UK) | Education | 2015 |
| MAENTERPRISES77 Ltd | Wholesale & retail | 2025 |
| Magma Ceramics Ltd | Manufacturing | 2011 |
| Magma Combustion Engineering Limited | Manufacturing | 2017 |
| Magna Beds Ltd | Wholesale & retail | 2023 |
| Magna Components Limited | Manufacturing | 2023 |
| Mahmood Property Investments Ltd | Real estate | 2026 |
| MAI Estate & Properties Ltd | Real estate | 2023 |
| Main FM Limited | Construction | 2017 |
| Maisha Investments Ltd | Other services | 2022 |
| Majestic Furnishings Limited | Wholesale & retail | 2010 |
| Majid Services Ltd | Professional & scientific | 2021 |
| Makda Ltd | Professional & scientific | 2026 |
| Making Sparks CIC | Information & communication | 2024 |
| Makkah Supermarket Limited | Wholesale & retail | 2026 |