| LOW Carbon Hub Sandford Hydro Limited | Energy | 2015 |
| LOW Carbon Oxford North | Other services | 2011 |
| LOW Carbon South Oxford Ltd | Wholesale & retail | 2022 |
| LOW Carbon West Oxford | Other services | 2009 |
| Lowe and Oliver Limited | Construction | 1987 |
| Lowe Holdings Limited | Professional & scientific | 1933 |
| Lower Farm Barns Estate Management Company Limited | Households | 1996 |
| Lower Farm Limited | Real estate | 2011 |
| Lowestoft Hydrogen Limited | Administrative & support | 2022 |
| Lowglow Ltd | Information & communication | 2018 |
| Lowrie Price Design Limited | Professional & scientific | 2003 |
| Lozana Construction Ltd | Construction | 2018 |
| LP Lighting Limited | Information & communication | 2015 |
| LP Tapestry Ltd | Wholesale & retail | 2015 |
| Lpchina Ltd | Education | 2023 |
| Lskate Ltd | Education | 2024 |
| LST Accounts Ltd | Professional & scientific | 2023 |
| LT Carpentry Ltd | Manufacturing | 2011 |
| LTG Construction Ltd | Construction | 2015 |
| Luca Science U.K. Ltd | Professional & scientific | 2021 |
| Lucent Letting Ltd Limited | Real estate | 2025 |
| Lucia Goldsmiths Limited | Manufacturing | 2024 |
| Lucid Insight Limited | Other services | 2014 |
| Lucidity Services Limited | Professional & scientific | 2017 |
| Lucius Estate Ltd | Real estate | 2024 |
| Lucky Chopsticks 5RS Ltd | Hospitality | 2024 |
| Lucy Coggle Design Limited | Professional & scientific | 2017 |
| Lucy Developments Limited | Construction | 2002 |
| Lucy Electric (EMS) Limited | Professional & scientific | 1981 |
| Lucy Electric Digital Solutions Limited | Manufacturing | 2007 |
| Lucy Electric Energy Services Limited | Manufacturing | 2025 |
| Lucy Electric EV Infrastructure Limited | Manufacturing | 2025 |
| Lucy Electric UK Limited | Manufacturing | 1974 |
| Lucy Group Ltd | Manufacturing | 1897 |
| Lucy Zodion Limited | Manufacturing | 2010 |
| Luecarn Properties Limited | Households | 1971 |
| Luigi Bonomi Associates Limited | Information & communication | 2004 |
| Luker Bros. (Removals & Storage) Limited | Transport & logistics | 1974 |
| Lukoh&Daughters Consultant Ltd | Other services | 2013 |
| Lula James Ltd | Manufacturing | 2021 |
| Luli Design and Management Ltd | Construction | 2019 |
| Lumai Limited | Manufacturing | 2021 |
| Lume VR Limited | Information & communication | 2018 |
| Lumen Partners Limited | Administrative & support | 2025 |
| LUMEN8 Ltd | Wholesale & retail | 2018 |
| Lumenai Ltd | Education | 2021 |
| Lumeza Ltd | Wholesale & retail | 2025 |
| Lumiere Medispa Ltd | Health & social care | 2015 |
| Lumora Nutrition Ltd | Wholesale & retail | 2025 |
| Lumu Limited | Real estate | 2021 |
| Lumzen Ltd | Wholesale & retail | 2025 |
| Luna N Lights Ltd | Construction | 2022 |
| Lunar Advisors Ltd | Information & communication | 2024 |
| Lunar Distributions Ltd | Wholesale & retail | 2023 |
| Lunar Trading Ltd | Hospitality | 2017 |
| Lunatus Limited | Professional & scientific | 2006 |
| Lunaz Automotive Ltd | Wholesale & retail | 2024 |
| Lunaz Design Ltd | Wholesale & retail | 2024 |
| Lunaz Holdings Ltd | Financial services | 2024 |
| Lunaz Tech Ltd | Wholesale & retail | 2024 |
| Lundy Estates Holdings Limited | Real estate | 2025 |
| Lundy Estates Limited | Real estate | 2025 |
| Lung WAH Chong Limited | Wholesale & retail | 2011 |
| Luntel Ltd | Information & communication | 2019 |
| Lurtis Limited | Information & communication | 2016 |
| Lush Solutions Ltd | Information & communication | 2014 |
| Lusination Ltd | Health & social care | 2023 |
| Lutet Limited | Professional & scientific | 2003 |
| Luton Shop Ltd | Wholesale & retail | 2025 |
| LUX Car Wash Oxford Ltd | Administrative & support | 2025 |
| LUX Living Oxford Group Ltd | Hospitality | 2026 |
| LUX Living Oxford Ltd | Hospitality | 2023 |
| LUX Populi UK Ltd | Professional & scientific | 2016 |
| Luxa Film Limited | Information & communication | 2025 |
| Luxdei Ltd | Professional & scientific | 2023 |
| Luxe Express Ltd | Wholesale & retail | 2018 |
| Luxebasket Limited | Wholesale & retail | 2025 |
| Luxington LLP | | 2007 |
| Luxury Race Ltd | Transport & logistics | 2024 |
| Lv-Ideas Ltd | Financial services | 2025 |
| LW Autos OXF Ltd | Wholesale & retail | 2025 |
| Lwlg Holdings Ltd | Financial services | 2022 |
| Lyminster Ltd | Professional & scientific | 2026 |
| Lynch Brother Developments Limited | Real estate | 2024 |
| Lynch Brother Homes Limited | Construction | 2021 |
| Lynch Brother Property Services Limited | Real estate | 2026 |
| Lynch Holdings Limited | Financial services | 2023 |
| Lyndon Drake Consulting Limited | Professional & scientific | 2024 |
| Lyne Court Management Company Limited | Households | 1989 |
| Lynn Morgan Associates Ltd | Professional & scientific | 2014 |
| Lynrace Ltd | Wholesale & retail | 2021 |
| M & B Hall Contractors Ltd | Construction | 1999 |
| M & B Transports Limited | Hospitality | 2021 |
| M & J Greenwood Limited | Real estate | 1981 |
| M & M Kebab Ltd | Hospitality | 2022 |
| M &M PVT Ltd | Wholesale & retail | 2019 |
| M a Accounting Limited | Professional & scientific | 2014 |
| M a Services Private Ltd | Administrative & support | 2017 |
| M Ahmed Locums Ltd | Health & social care | 2015 |
| M Colwell Holdings Limited | Real estate | 1985 |