| Leven Health Matters Limited | Wholesale & retail | 1993 |
| Lewga (Holdings) Limited | Financial services | 2019 |
| Lewga (Properties) Limited | Real estate | 2021 |
| Lewis Northen Funeral Directors Ltd | Other services | 2020 |
| LFP Systems Limited | Information & communication | 2013 |
| LGS Manufacturing Ltd | Extraterritorial | 2020 |
| Libby Lown Design Ltd | Professional & scientific | 2022 |
| Liberty House Hull Management Limited | Households | 2022 |
| Liberty Properties (Yorkshire) Ltd | Construction | 2020 |
| Liebre Developments Ltd | Construction | 2014 |
| Lightouch Solutions Limited | Manufacturing | 2023 |
| Like Associates Ltd | Education | 2022 |
| Lilium Medical Services Limited | Health & social care | 2013 |
| Lilys DT Property Ltd | Real estate | 2026 |
| Lindofen View Management Company Limited | Households | 2021 |
| Lindum Property Ltd | Real estate | 2023 |
| Lingua Directions Limited | Education | 2002 |
| Linh Nails 9724 Ltd | Other services | 2025 |
| Linkage Financial Solutions Ltd | Financial services | 2023 |
| Linkage Mortgage Solutions Ltd | Financial services | 2026 |
| Lionize Law (Beverley) Ltd | Professional & scientific | 2019 |
| Litten Associates Ltd | Professional & scientific | 2004 |
| Litter Kwitter Ltd | Manufacturing | 2026 |
| Little Chestnuts Home Nursery Ltd | Health & social care | 2025 |
| Little Weighton (East Yorkshire) Limited | Transport & logistics | 2022 |
| Little Wold Vineyard Limited | Hospitality | 2014 |
| Livelead Ltd | Administrative & support | 2016 |
| LJD Magitech Limited | Information & communication | 2015 |
| LKH Ltd | Real estate | 2023 |
| Lloyds Autotech Limited | Wholesale & retail | 2023 |
| LMS Wood Yard Ltd | Wholesale & retail | 2023 |
| LMT Estate Agent Limited | Real estate | 2022 |
| Lockpad Limited | Real estate | 1989 |
| Locksmiths Humberside Ltd | Administrative & support | 2022 |
| Lockwood Services Ltd | Manufacturing | 2025 |
| Lodgewood Properties Limited | Real estate | 2002 |
| Loftcon Limited | Construction | 2018 |
| Lone Tiger Holdings Ltd | Financial services | 2025 |
| Look Natural Aesthetics Ltd | Health & social care | 2019 |
| Loose Foods Ltd | Wholesale & retail | 2023 |
| Loud Digital Ltd | Professional & scientific | 2021 |
| Lovely Place Limited | Hospitality | 2021 |
| Lowson & Co (Holdings) Limited | Professional & scientific | 2019 |
| Lowson & Co. Limited | Real estate | 1975 |
| Loxy Beauty Studio Limited | Other services | 2025 |
| LPE Group Holdings Ltd | Financial services | 2019 |
| LPE Group Ltd | Wholesale & retail | 2005 |
| LPP Holdings Ltd | Hospitality | 2023 |
| LRS Hull Limited | Wholesale & retail | 2018 |
| LRS Properties Hull Ltd | Households | 2021 |
| LS Instruments Limited | Construction | 2017 |
| Lstq Limited | Real estate | 2015 |
| Lucy Stamford Financial Services Limited | Financial services | 2020 |
| Luke & Co. Ltd | Real estate | 2024 |
| Lumi Lounge Ltd | Other services | 2025 |
| Lumyn Ltd | Professional & scientific | 2024 |
| LZ Simply LET Limited | Real estate | 2018 |
| M & J Private Hire Ltd | Administrative & support | 2011 |
| M & M Autotech Limited | Wholesale & retail | 2011 |
| M & W Development Limited | Construction | 2013 |
| M a Consultants (Yorkshire) Ltd | Administrative & support | 2006 |
| M Drury Limited | Administrative & support | 2005 |
| M J Stokoe Decorating Services Ltd | Construction | 2013 |
| M J Waites Limited | Construction | 2015 |
| M Shirley Ventures Ltd | Professional & scientific | 2024 |
| M&A Property Services (Yorkshire) Ltd | Real estate | 2018 |
| M&J Engineering Consultants Ltd | Professional & scientific | 2018 |
| MA Brazilian Flavours Limited | Hospitality | 2020 |
| MAC Electrical (Hull) Limited | Construction | 2008 |
| MAC Heat Pumps Ltd | Extraterritorial | 2021 |
| Mach Space Ltd | Information & communication | 2021 |
| Machaira Limited | Manufacturing | 2026 |
| Maclemso Property Investments Limited | Construction | 2008 |
| Mactrattles Ltd | Professional & scientific | 2025 |
| MAD About Horror Ltd | Wholesale & retail | 2016 |
| MAD About Props Limited | Wholesale & retail | 2020 |
| MAD About Scares Limited | Wholesale & retail | 2020 |
| Madden Homes Limited | Construction | 2014 |
| Mafting Ltd | Professional & scientific | 2023 |
| MAG Properties (Hull) Limited | Real estate | 2021 |
| Magarlo Residential Portfolio II Ltd | Real estate | 2019 |
| Magnum (Northern) Ltd. | Transport & logistics | 1986 |
| Mainstay Films Limited | Administrative & support | 2020 |
| Makis Leisure Limited | Hospitality | 1984 |
| Mallard (Beverley) Management Company Limited | Households | 2022 |
| Malster Contracting Limited | Construction | 2011 |
| Maltby Independent Funeral Service Limited | Other services | 2003 |
| Malup Services Limited | Professional & scientific | 2011 |
| Mamas Tandoori Ltd | Hospitality | 2019 |
| MAN With Van CAN Ltd | Transport & logistics | 2021 |
| Manor Farm Camping Ltd | Hospitality | 2014 |
| Manor Grange Stud Ltd | Agriculture & fishing | 2026 |
| Manor Wood Limited | Agriculture & fishing | 2008 |
| MAP Accommodation Ltd | Real estate | 2025 |
| MAP Finance Ltd | Financial services | 2025 |
| Maple House Estates Ltd | Households | 2022 |
| Maple Kitchen Limited | Hospitality | 2019 |
| Maplebond Estates Ltd | Real estate | 2007 |
| Marin Engineers Ltd | Manufacturing | 2019 |
| Marina Properties Hull Limited | Real estate | 2023 |