| Letz Play Limited | Arts & recreation | 2006 |
| Level Eleven Games Ltd | Information & communication | 2025 |
| Levideo Ltd | Information & communication | 2008 |
| Leyland Road Developments Limited | Construction | 2025 |
| Life and Fork Limited | Hospitality | 2007 |
| Lift & Locate (UK) Limited | Transport & logistics | 2024 |
| Lift & Locate Limited | Transport & logistics | 2021 |
| Lightship Ltd | Information & communication | 2025 |
| Linden Properties Limited | Real estate | 1997 |
| Lionman Limited | Agriculture & fishing | 1986 |
| Liquid Thinking Ltd | Information & communication | 2002 |
| Livingston Holdings Limited | Financial services | 2019 |
| Livingstone Fishing LLP | | 2013 |
| LMC Education Limited | Education | 2009 |
| LMJ Property Development Hull Limited | Construction | 2020 |
| LMP Property Solutions Limited | Administrative & support | 2018 |
| LN Trading Ltd | Other services | 2020 |
| Lockwood Maritime Limited | Professional & scientific | 2002 |
| Lockwood Shipping Limited | Transport & logistics | 1988 |
| Logo World Designs Ltd | Administrative & support | 2012 |
| Lola’S House Residential Home Limited | Health & social care | 2022 |
| Longvisions Media Limited | Information & communication | 2007 |
| Loom Consultancy Limited | Professional & scientific | 2023 |
| Lorna Loves Limited | Wholesale & retail | 2019 |
| Lost Souls Forever Ltd | Information & communication | 2018 |
| Lottie Shaw's Limited | Manufacturing | 1993 |
| Louth Care Limited | Real estate | 2010 |
| Louth-W Care Limited | Administrative & support | 2020 |
| Lowfield Services (Hull) Limited | Administrative & support | 2003 |
| Lowgate Holdings Limited | Real estate | 2025 |
| Lowgate Italian Limited | Hospitality | 2024 |
| LSP Protect Solutions Limited | Construction | 2023 |
| Lunar Pathways Ltd | Arts & recreation | 2025 |
| Lutton Land Limited | Construction | 2024 |
| LUX Living-Uk Limited | Wholesale & retail | 2019 |
| Lynq AI Ltd | Manufacturing | 2025 |
| Lytmo Services Ltd | Professional & scientific | 2023 |
| M C Bear Limited | Health & social care | 2019 |
| M Savage Building & Joinery Ltd | Construction | 2015 |
| M Savage Fire Door Services Ltd | Construction | 2026 |
| M W Joinery Services (Hull) Limited | Construction | 2010 |
| M&D Property Services (Hessle) Ltd | Real estate | 2020 |
| M.Tongue Brickwork Ltd | Construction | 2019 |
| Made Direct Ltd | Manufacturing | 2026 |
| Magic Garden Landscapes Limited | Administrative & support | 2014 |
| Mahalsa Limited | Health & social care | 2015 |
| Mainman Limited | Information & communication | 2026 |
| Majestic Exterior Cleaning Ltd | Administrative & support | 2026 |
| Malees Empire Ltd | Hospitality | 2025 |
| Maltings Management (Hull) Limited | Real estate | 1996 |
| Mams Development Limited | Real estate | 2026 |
| Marine Fuels Alliance Ltd | Other services | 2020 |
| Mark Kensett Photography Limited | Professional & scientific | 2007 |
| Mark Rangeley Limited | Real estate | 2003 |
| Marketlife Services Ltd | Information & communication | 2018 |
| Markham Wallis Limited | Construction | 2023 |
| Marr (North West Africa) Limited | Extraterritorial | 2010 |
| Marr Atlantic Limited | Extraterritorial | 2014 |
| Marrfish Limited | Hospitality | 2009 |
| Marshall Coating Services Ltd | Construction | 2026 |
| Marshall Energy Limited | Construction | 2024 |
| Marvel Properties Limited | Real estate | 2009 |
| Masbelle Limited | Financial services | 2014 |
| Matina | Financial services | 2024 |
| Matt Enright Enterprises Ltd | Financial services | 2023 |
| Matthew Good Foundation | Professional & scientific | 2011 |
| MAX & Ellie Ltd | Wholesale & retail | 2011 |
| Mayview Property Limited | Real estate | 2025 |
| Mayvilla Properties Limited | Real estate | 2015 |
| MBI Interior Design Limited | Professional & scientific | 2019 |
| Mcwilliam Associates Limited | Professional & scientific | 2003 |
| MDI Solutions Limited | Administrative & support | 2021 |
| Mechen Limited | Real estate | 2026 |
| MED Apparels Ltd | Wholesale & retail | 2024 |
| Medlead Services Limited | Health & social care | 2021 |
| Mednext Limited | Public administration | 2023 |
| Medovert Limited | Health & social care | 2024 |
| Melton Auto Electrics Limited | Wholesale & retail | 2021 |
| Melton Industrial Park Limited | Real estate | 2009 |
| Melton Park (North Ferriby) Management Company Limited | Households | 2013 |
| Men's Edition Limited | Other services | 2012 |
| MGC Landscape Solutions Limited | Administrative & support | 2017 |
| MGC Portfolio Ltd | Real estate | 2023 |
| MH Manufacturing Services Limited | Professional & scientific | 2014 |
| MHT Hessle Limited | Hospitality | 2018 |
| Michael Hetherington Limited | Administrative & support | 2015 |
| Midgard Lettings Limited | Real estate | 2024 |
| Midnight Crown Limited | Financial services | 2025 |
| Migho’S Ltd | Real estate | 2022 |
| Millar Estates Limited | Construction | 1989 |
| Miller Brothers Ltd | Extraterritorial | 2014 |
| Mitchell & Partners Ltd | Professional & scientific | 2022 |
| Mitchell Investco Limited | Real estate | 2018 |
| Mitol Limited | Information & communication | 2004 |
| MJR Systems Limited | Manufacturing | 2025 |
| MKB Productions Ltd | Arts & recreation | 2025 |
| MKT Holdings Limited | Financial services | 2017 |
| MKT Wealth Management Limited | Financial services | 2011 |
| MM Enterprise Hull Ltd | Hospitality | 2021 |
| MNB Computing Limited | Other services | 2020 |