| Lionfield Investments Ltd | Information & communication | 2018 |
| Lionfield Properties Ltd | Real estate | 2021 |
| Lionsheart Finance Limited | Financial services | 2018 |
| Lionsheart Properties Limited | Construction | 2013 |
| Liqr Ltd | Hospitality | 2025 |
| Lisa Pollard Lettings Limited | Real estate | 2012 |
| Lisnr UK Limited | Administrative & support | 2024 |
| Lithic & Co Ltd | Wholesale & retail | 2025 |
| Little Amazon | Professional & scientific | 2012 |
| Little Colouring Ltd | Health & social care | 2025 |
| Little Manor Gardens Management Company Limited | Households | 1994 |
| Little Meadow Cranleigh Ltd | Households | 2018 |
| Little Oak Biogas Ltd | Energy | 2023 |
| Little Spud Productions Limited | Information & communication | 2015 |
| Little Tangley Limited | Households | 1952 |
| Little Urchins Limited | Wholesale & retail | 2018 |
| Little Wedding Ideas Limited | Wholesale & retail | 2012 |
| Little White Rose Films Limited | Information & communication | 2013 |
| Little Zookeepers Ltd | Wholesale & retail | 2009 |
| Littletalk SLT Limited | Education | 2025 |
| Liverpool Victoria General Insurance Group Limited | Financial services | 2001 |
| Liverpool Victoria Insurance Company Limited | Financial services | 1996 |
| Livvy's Kitchen Cupcakes Ltd | Extraterritorial | 2018 |
| LIZ Tech Ltd | Information & communication | 2020 |
| LIZ Tyler Consulting Limited | Professional & scientific | 2021 |
| Liza Cartwright Limited | Professional & scientific | 2020 |
| Lizzie Knowles Productions Ltd | Administrative & support | 2020 |
| LJ Property Services Ltd | Financial services | 2019 |
| LJH Heating and Plumbing Ltd | Construction | 2023 |
| LKH Properties (Ardenham Court) Limited | Real estate | 2012 |
| LKH Properties Limited | Construction | 2006 |
| LL Beauty Lounges Ltd | Other services | 2023 |
| Llanaway House Management Limited | Households | 1997 |
| LMC Dance & Acrobatics Ltd | Education | 2025 |
| LMR Equine Ltd | Agriculture & fishing | 2026 |
| LNG Contracts International Limited | Professional & scientific | 2010 |
| LO Construction Limited | Construction | 2021 |
| Load of Balls Limited | Information & communication | 2014 |
| Local Roofing and Carpentry Ltd | Construction | 2022 |
| Lochlane and Laggan Limited | Administrative & support | 2011 |
| Lochnaw Castle Estates Limited | Real estate | 2018 |
| Locin Energy Limited | Professional & scientific | 2012 |
| Lock Group Limited | Information & communication | 1985 |
| Locke Properties Limited | Real estate | 2011 |
| Lockie Hart Consulting Limited | Professional & scientific | 2012 |
| Locking Wheel Nuts Removed Ltd | Wholesale & retail | 2025 |
| Locktaram Limited | Real estate | 2024 |
| Locust Systems (UK) Limited | Transport & logistics | 2017 |
| Locutus Ltd | Information & communication | 2015 |
| Lodge SS Limited | Real estate | 2008 |
| Logistics Labs Ltd | Information & communication | 2022 |
| Loire Nominee Limited | Financial services | 2020 |
| Loire UK Bidco Limited | Financial services | 2019 |
| Loire UK Midco 1 Limited | Financial services | 2019 |
| Loire UK Midco 2 Limited | Financial services | 2019 |
| Londexa Limited | Wholesale & retail | 2025 |
| London & Edinburgh Equity Ltd | Real estate | 1992 |
| London 36 Limited | Professional & scientific | 2017 |
| London AK Ltd | Construction | 2019 |
| London and Dyce Limited | Construction | 2015 |
| London AV Solutions Limited | Professional & scientific | 2016 |
| London Camera Department Ltd | Information & communication | 2011 |
| London Computer Solution Limited | Information & communication | 1991 |
| London Heli-Charters Limited | Administrative & support | 2006 |
| London Lighting Limited | Wholesale & retail | 2013 |
| London United Busways Trustee Company NO.3 Limited | Professional & scientific | 1994 |
| Londonbang Ltd | Wholesale & retail | 2011 |
| Long Bridge 1 Limited | Construction | 2024 |
| Long Bridge 2 Limited | Construction | 2024 |
| Long Copse Bracknell LP | | 2013 |
| Longacre School | Education | 2003 |
| Longmead Financial Solutions Ltd. | Financial services | 2020 |
| Lookout Consultants Ltd | Professional & scientific | 2011 |
| Loomaural Limited | Real estate | 1982 |
| Loop Dynamics Group Ltd | Professional & scientific | 2024 |
| Lorant Securities Limited | Professional & scientific | 1989 |
| Lord Prawn Limited | Hospitality | 2024 |
| Lordsgate Ltd. | Real estate | 2021 |
| Lorem Ipsum Marketing Limited | Professional & scientific | 2004 |
| Lorenz Life Sciences Limited | Other services | 1995 |
| Lorne Studio Limited | Information & communication | 2019 |
| Loroc London Limited | Real estate | 2014 |
| Lotus GAS Ltd | Construction | 2012 |
| Lotus Health Limited | Professional & scientific | 2006 |
| Lotus Roots Consulting Ltd | Information & communication | 2024 |
| Lou's Removals and Couriering Ltd | Transport & logistics | 2024 |
| Loud BOY Productions Ltd | Information & communication | 2012 |
| Louis DE Buisson Limited | Wholesale & retail | 2010 |
| Louise Carey Consulting Ltd | Education | 2020 |
| Love Limited | Professional & scientific | 1999 |
| Love Nails and Beauty Limited | Other services | 2015 |
| Love Smoothies Limited | Extraterritorial | 2013 |
| Love Struck (F&B) Limited | Manufacturing | 2004 |
| Love Struck Holdings Limited | Financial services | 2015 |
| Love Swimming Limited | Other services | 2010 |
| Love Visual Roots Ltd | Wholesale & retail | 2018 |
| Love Your Home for Less Limited | Extraterritorial | 2008 |
| Lovetts Limited | Professional & scientific | 1994 |
| Loving to Care Ltd | Health & social care | 2016 |
| Lowcote Investments | Financial services | 2025 |