| Lawrence Jamaican Cuisine Limited | Wholesale & retail | 2025 |
| Lay&Slay.Glam.Hub Limited | Other services | 2025 |
| LC Sound Consulting Limited | Information & communication | 2022 |
| Lealands Gate Management Limited | Real estate | 2021 |
| Leamington Gate Management Company Limited | Households | 2008 |
| Lece Holdings Limited | Financial services | 2026 |
| LGR Nurseries Group Limited | Financial services | 2018 |
| Lifeside Limited | Other services | 2022 |
| Lifestone Property Ltd | Real estate | 2025 |
| Light Car Company Limited | Manufacturing | 1991 |
| Lily One Ltd | Real estate | 2025 |
| Lilypad Stays Ltd | Real estate | 2024 |
| Lime Tree Cottages Management Company Limited | Administrative & support | 2004 |
| Liquiheat Limited | Extraterritorial | 2011 |
| Lissielou Ltd | Wholesale & retail | 2016 |
| Little Coxwell Investment Limited | Real estate | 2016 |
| Little Green Rascals Organic Day Nurseries Limited | Education | 2008 |
| Little Mice 2 Day Nursery (UK) Ltd | Education | 2014 |
| LK Media Limited | Professional & scientific | 2026 |
| Llangoed Limited | Hospitality | 2012 |
| Lodn Limited | Administrative & support | 2009 |
| Logiqwest Limited | Information & communication | 2003 |
| Lone Wolf Production Music Ltd | Information & communication | 2021 |
| Longcot Estates Limited | Real estate | 2013 |
| Longcot Self Build Ltd | Construction | 2025 |
| Louis Lulu Limited | Real estate | 2010 |
| Louise Cooke Consulting Ltd | Professional & scientific | 2024 |
| Love Nangie Ltd | Education | 2026 |
| Lume Partners Limited | Professional & scientific | 2026 |
| Lumen Training Limited | Arts & recreation | 2026 |
| Luna Branding Ltd | Professional & scientific | 2014 |
| LUX & Livre Limited | Manufacturing | 2025 |
| M J Colson Limited | Information & communication | 2008 |
| M. P. West Construction Limited | Construction | 2007 |
| Macfie Associates Limited | Professional & scientific | 2009 |
| Mackenzie Estates Oxfordshire Ltd | Households | 2020 |
| Mag&Cris Ltd | Construction | 2017 |
| Magenta Classic Cars Limited | Wholesale & retail | 2026 |
| Magentacore HR Solutions Limited | Administrative & support | 2025 |
| Magno Enterprises Ltd | Hospitality | 2021 |
| Malmesbury Self Build Ltd | Construction | 2021 |
| Mammon Ltd | Financial services | 2021 |
| Manor Farm (Buckland) Limited | Agriculture & fishing | 1979 |
| Manor Farm (Fernham) Management Company Limited | Real estate | 2005 |
| Marabou Club Ltd | Wholesale & retail | 2023 |
| Marriotts Property LLP | | 2013 |
| Maryann Godwin Limited | Health & social care | 2019 |
| MAT B Event Company and Rental Ltd | Hospitality | 2026 |
| Matt Franks Farriery Services Limited | Professional & scientific | 2015 |
| Maverick Pools Ltd | Education | 2019 |
| MB Capital Properties Limited | Real estate | 2018 |
| Mcrobert Associates Limited | Real estate | 2019 |
| MD Carpentry Workshop Ltd | Manufacturing | 2023 |
| Meblur Ltd | Information & communication | 2025 |
| Meniscusmedical Contractors Ltd | Information & communication | 2013 |
| Meniscustranslations Ltd | Professional & scientific | 2013 |
| Metal Rebellion Ltd | Manufacturing | 2026 |
| Michael Powers Ltd | Other services | 2019 |
| Mike Young Construction Limited | Construction | 2023 |
| Milla Investments Ltd | Real estate | 2019 |
| Miss Poppy's Gymnastics Ltd | Education | 2019 |
| MJ Medica Consulting Ltd | Health & social care | 2019 |
| Mlrs Faringdon Ltd | Hospitality | 2026 |
| Mondi Associates Limited | Administrative & support | 2000 |
| Morley Harps Limited | Wholesale & retail | 2023 |
| Morley Health Communications Ltd | Professional & scientific | 2008 |
| Motorleague Ltd | Wholesale & retail | 2023 |
| Mount Pleasant Farm Residents Association Limited | Households | 2013 |
| Movepurpose Property Management Limited | Real estate | 1996 |
| MRB Traffic Solutions Ltd | Transport & logistics | 2023 |
| Mumbles & Tartle Productions Limited | Health & social care | 2020 |
| My Carer Ltd | Health & social care | 2011 |
| My First Friends Bromsgrove Limited | Education | 2015 |
| My First Friends Droitwich Limited | Health & social care | 2016 |
| My First Friends Holdings Limited | Financial services | 2013 |
| My First Friends Limited | Education | 2004 |
| My Little Bake Box Ltd | Wholesale & retail | 2023 |
| Mypetspace Ltd | Other services | 2026 |
| Mytchett Road Chippy Ltd | Hospitality | 2025 |
| Naira Digital Growth Ltd | Information & communication | 2026 |
| Nash Motor Vehicle Services Limited | Wholesale & retail | 2011 |
| Nature-Ally Ltd | Financial services | 2024 |
| NET Zero Advice Ltd | Professional & scientific | 2023 |
| Netherwood Hotel and Spa Limited | Hospitality | 2025 |
| Nevoltra Global Limited | Professional & scientific | 2026 |
| New Farm Estate Limited | Extraterritorial | 2019 |
| New Farm Estate Two Limited | Extraterritorial | 2024 |
| Newpro (U.K.) Limited | Wholesale & retail | 1985 |
| Newstead Oxford Ltd | Real estate | 2023 |
| NFM Care Solutions Limited | Health & social care | 2022 |
| Nicola Cale Limited | Health & social care | 2011 |
| Nigel Kelly Consulting Limited | Information & communication | 2016 |
| NO Name Studio Ltd | Wholesale & retail | 2005 |
| Nomad Orbital Ltd | Manufacturing | 2024 |
| Nosh ! Limited | Hospitality | 2000 |
| Noslegal Ltd | Professional & scientific | 2021 |
| Npes Developments Ltd | Construction | 2017 |
| OAK51 Consulting Limited | Professional & scientific | 2024 |
| Oakwood Landscaping and Groundwork Limited | Construction | 1997 |
| OCC Kicks Ltd | Wholesale & retail | 2024 |