| Luna York Ltd | Other services | 2024 |
| Lunarum Ltd | Wholesale & retail | 2024 |
| Lund Studios Ltd | Arts & recreation | 2016 |
| Lundia (UK) Ltd | Wholesale & retail | 1998 |
| Lunds Court Residents Limited | Households | 2017 |
| Lupane Ltd | Construction | 2015 |
| Lush Beauty Treatments Ltd | Other services | 2024 |
| LUX Holdings Ltd | Financial services | 2022 |
| LUX Neat Limited | Professional & scientific | 2022 |
| LUX Rhaan Limited | Hospitality | 2022 |
| Luxe Love Boutique Ltd | Wholesale & retail | 2025 |
| Luxenest Realty Ltd | Real estate | 2025 |
| Luxhouse Ltd | Real estate | 2024 |
| Luxion Perry Limited | Wholesale & retail | 2025 |
| Luxlo Drinks Ltd | Extraterritorial | 2022 |
| Luxlo Holdings Limited | Extraterritorial | 2022 |
| Luxlo Ltd | Extraterritorial | 2022 |
| Luxlo Spirits Ltd | Extraterritorial | 2022 |
| Luxorlodge Limited | Households | 1978 |
| Luxstowe Vets Limited | Professional & scientific | 2014 |
| Luxury Dream Homes Ltd | Real estate | 2018 |
| Luxury Estate Holdings Ltd | Real estate | 2014 |
| Luxury Hotels Management Company Ltd | Professional & scientific | 2015 |
| LV Bridal Studio Ltd | Wholesale & retail | 2024 |
| LV Quotidien LE Veinard Quotidien Hippique Ltd | Manufacturing | 2023 |
| LVB Interiors Limited | Professional & scientific | 2020 |
| LW Lets Limited | Real estate | 2022 |
| LW Smile Ltd | Health & social care | 2023 |
| LWB (York) Limited | Real estate | 2014 |
| Lwimbo Service Ltd | Health & social care | 2020 |
| Lycans Company Limited | Financial services | 2020 |
| Lynby Leisure Ltd | Administrative & support | 2017 |
| Lyntonwall Limited | Professional & scientific | 1998 |
| Lynwood Vets Limited | Professional & scientific | 2013 |
| Lyon Consultancy Ltd | Professional & scientific | 2019 |
| Lyons Blade Limited | Wholesale & retail | 2025 |
| Lythe Caravan and Camping Ltd | Hospitality | 2021 |
| M & B Farming Limited | Agriculture & fishing | 2006 |
| M & D Harris Ltd | Real estate | 2021 |
| M & G Scaffolding (York) Limited | Construction | 2006 |
| M & J Medway Ltd | Hospitality | 2012 |
| M & L Smith Properties Limited | Real estate | 2022 |
| M & M Marketing (UK) Limited | Wholesale & retail | 2003 |
| M & M Property Care Limited | Construction | 2016 |
| M & R Developments Yorkshire Limited | Real estate | 2024 |
| M & S Agricultural Contracting Ltd | Agriculture & fishing | 2014 |
| M & S EVP Limited | Professional & scientific | 2008 |
| M & S Investment Group Ltd | Real estate | 2019 |
| M & S Property Services (York) Limited | Real estate | 2003 |
| M a K Joinery Limited | Construction | 2007 |
| M a Safety Ltd | Professional & scientific | 2022 |
| M B Builders York Ltd | Construction | 2022 |
| M B Wealth Planning Limited | Professional & scientific | 2021 |
| M Bradshaw Consulting Limited | Professional & scientific | 2009 |
| M C West Property Limited | Construction | 2026 |
| M Capital (Citylife) Limited | Construction | 2021 |
| M Capital Partners Limited | Financial services | 2017 |
| M Collins Plumbing and Heating Ltd | Construction | 2023 |
| M Cooper Civil Engineering Ltd | Construction | 2014 |
| M D Projects (Yorkshire) Limited | Wholesale & retail | 2004 |
| M Dunham Building Ltd | Construction | 2025 |
| M E Engineers (Yorkshire) Limited | Professional & scientific | 2017 |
| M Ellis Arbitrage Ltd | Wholesale & retail | 2024 |
| M Engineering Consultants Limited | Professional & scientific | 2020 |
| M Estates Limited | Construction | 2012 |
| M Events Ltd | Administrative & support | 2025 |
| M G Electrical (Easingwold) Limited | Construction | 2008 |
| M G Pocock (Holdings) Limited | Administrative & support | 2012 |
| M H C Associates Limited | Health & social care | 1994 |
| M Hawkswell Contracting Limited | Agriculture & fishing | 2017 |
| M Hutchinson Builders & Contractors Ltd | Construction | 2016 |
| M Invesco Limited | Real estate | 2019 |
| M J & S Barratt Limited | Wholesale & retail | 2008 |
| M J Blackburn Motor Engineers Limited | Wholesale & retail | 2008 |
| M J Gurney Limited | Construction | 2018 |
| M J Sporting Limited | Wholesale & retail | 2022 |
| M Jackson Contractors Ltd | Construction | 2014 |
| M K Campbell Holdings Limited | Financial services | 2021 |
| M K Signs Limited | Other services | 2017 |
| M Kayman Limited | Real estate | 2023 |
| M L Designs Ltd | Manufacturing | 2020 |
| M M Microwave Limited | Manufacturing | 2010 |
| M Maks Mart Ltd | Hospitality | 2022 |
| M Mayne Consulting Ltd | Information & communication | 2019 |
| M Nelson Limited | Extraterritorial | 2011 |
| M R Jibson Farmer | Agriculture & fishing | 2002 |
| M Realty International Limited | Real estate | 2016 |
| M Salama Medical Ltd | Health & social care | 2024 |
| M Securities Limited | Real estate | 2016 |
| M T F L Limited | Health & social care | 2022 |
| M T M Contractors Limited | Construction | 2021 |
| M Turnbull York Ltd | Wholesale & retail | 2011 |
| M Tymon Window Cleaning Ltd | Administrative & support | 2014 |
| M UK Investments Ltd | Financial services | 2023 |
| M Winn Racing Limited | Arts & recreation | 2026 |
| M&A Investments (York) Limited | Real estate | 2015 |
| M&C Homes Ltd | Real estate | 2019 |
| M&E Business Consulting Ltd | Professional & scientific | 2018 |
| M&G Dwellings Ltd | Real estate | 2024 |
| M&J Property (York) Ltd | Real estate | 2024 |