| Larm Property Services Ltd | Administrative & support | 2023 |
| Latitude Sports Stars Limited | Education | 2026 |
| Latitude Wellness Limited | Arts & recreation | 2022 |
| Launchpaduk Limited | Professional & scientific | 2024 |
| Laura Kirdale Consulting Limited | Administrative & support | 2023 |
| Lavinias Cafe Bar Ltd | Hospitality | 2015 |
| Lawlers Driver Training Limited | Education | 2018 |
| Laycock International Limited | Manufacturing | 2006 |
| Lcam Bolton Royd Ltd | Real estate | 2018 |
| LCJ Denim Co Limited | Wholesale & retail | 2013 |
| Leasehold Consultancy Services Limited | Professional & scientific | 2011 |
| Leave NO Track Ltd | Wholesale & retail | 2025 |
| Leeds Eats Ltd | Information & communication | 2021 |
| Leeming & Peel Limited | Manufacturing | 1999 |
| Left Turn Cycling CIC | Arts & recreation | 2023 |
| Leig (Holdings) Ltd | Professional & scientific | 1993 |
| Lenrick Maven Ltd | Professional & scientific | 2026 |
| LEO Lash Academy Limited | Education | 2022 |
| LEO Lash Range Limited | Wholesale & retail | 2022 |
| Leodis Consultants Limited | Professional & scientific | 2018 |
| Leodis Holdings Limited | Financial services | 2024 |
| Let's Go Lettings Ltd | Real estate | 2026 |
| Lexem Legal Limited | Professional & scientific | 2016 |
| Lgrg Limited | Administrative & support | 2017 |
| Liberated Life Ltd | Other services | 2025 |
| Liberty Design and Build Limited | Construction | 2014 |
| Lightmedia Displays Limited | Other services | 1997 |
| Lindale Enterprises Ltd | Information & communication | 1997 |
| Linmark Consulting Ltd | Professional & scientific | 2016 |
| Lintons Solutions Limited | Health & social care | 2021 |
| Liquid Aluminium Limited | Wholesale & retail | 2019 |
| Little England and Co. Limited | Construction | 2009 |
| Little Lovers Ltd | Manufacturing | 2022 |
| LIV 4 Ltd | Wholesale & retail | 2025 |
| Live Wire Electrical Services (Yorkshire) Limited | Construction | 2013 |
| Lived Experience Speakers Limited | Education | 2023 |
| Lloyd Elliot Estates Limited | Real estate | 1991 |
| Lodepit Pedigree Livestock Ltd | Agriculture & fishing | 2024 |
| Logicality Limited | Information & communication | 2021 |
| Lotti Limited | Professional & scientific | 2024 |
| Lovefooduk Limited | Hospitality | 2013 |
| LOW Lane Head Properties Limited | Real estate | 2016 |
| LOW Wave Limited | Professional & scientific | 2007 |
| LOW Wood Associates Limited | Professional & scientific | 2018 |
| LRG Consultants Limited | Administrative & support | 2020 |
| Ludlam-Raine Brothers Ltd | Real estate | 2018 |
| Ludlam-Raine Holmes Ltd | Real estate | 2016 |
| Ludlam-Raine Properties Ltd | Real estate | 2018 |
| Luna FM Ltd | Professional & scientific | 2025 |
| Luxe Rentals Ltd | Real estate | 2016 |
| Lyles Gregory Security Solutions Ltd | Administrative & support | 2018 |
| M & B Estates Limited | Real estate | 2001 |
| M & SH Limited | Wholesale & retail | 2006 |
| M B Properties (Yorkshire) Ltd | Real estate | 2023 |
| M C Thompson Limited | Health & social care | 2012 |
| M Hunter. Coaching and Mentoring Services Limited | Education | 2020 |
| M220 Ltd | Real estate | 2016 |
| Macs Mission CIC | Administrative & support | 2024 |
| Mactivity Enterprises Limited | Information & communication | 2017 |
| Madame MAE Ltd | Wholesale & retail | 2020 |
| Madden Engineering Ltd | Professional & scientific | 2023 |
| Maftx Limited | Information & communication | 2019 |
| Magical History Stories Limited | Information & communication | 2017 |
| Magma-Well Limited | Wholesale & retail | 2025 |
| Mahuta Limited | Information & communication | 2019 |
| Main Street Cafe & Deli Limited | Hospitality | 2019 |
| Margaret Holliss Ltd | Information & communication | 2022 |
| Mark Skedd Ltd | Administrative & support | 2019 |
| Market Disruptors Ltd | Information & communication | 2021 |
| Marks Fisheries Ltd | Hospitality | 2025 |
| Mashup Analytics Ltd | Professional & scientific | 2018 |
| Mason & Rose Home Fragrance Ltd | Wholesale & retail | 2026 |
| Master KUT Ltd | Other services | 2025 |
| Matressence Ltd | Professional & scientific | 2026 |
| Mavs Bars Ltd | Hospitality | 2026 |
| Mayday Nutritional Therapy Ltd | Health & social care | 2026 |
| MBA Property Investments Ltd | Real estate | 2026 |
| MC + AM Thompson Limited | Real estate | 2018 |
| MC Engineering Consultancy Limited | Professional & scientific | 2009 |
| Mcquaid & Sons Limited | Real estate | 2011 |
| Md&A Property Limited | Real estate | 2017 |
| ME Consulting Limited | Professional & scientific | 2026 |
| MEC Communication Ltd | Wholesale & retail | 2018 |
| Medical Expert Services Ltd | Professional & scientific | 2018 |
| Medical Services Bradford Limited | Health & social care | 2013 |
| Mezzanine Industries Limited | Construction | 2005 |
| Mhengineeringwy. Ltd | Construction | 2014 |
| MHS Properties (Yorkshire) Limited | Real estate | 2024 |
| Michael Ainsworth Design Partnership Limited | Professional & scientific | 2021 |
| Michael Chapman Plumbing & Heating Limited | Construction | 2008 |
| Microprecise Ltd | Professional & scientific | 2025 |
| MID House Ltd | Real estate | 2019 |
| Miller Treats Limited | Wholesale & retail | 2019 |
| MJG Surgical Limited | Health & social care | 2012 |
| MJL Terrain Ltd | Arts & recreation | 2021 |
| MJR Contractors Ltd | Manufacturing | 2019 |
| Mjrs Investments Limited | Other services | 2010 |
| Mjwn 2.0 Limited | Financial services | 2026 |
| Mjwn Limited | Health & social care | 2018 |
| MN People Solutions Limited | Professional & scientific | 2026 |