| Little Field Estates Ltd | Real estate | 2021 |
| Little GEM BUS Company Ltd | Wholesale & retail | 1999 |
| Little Green Sprogs Ltd | Wholesale & retail | 2020 |
| Little Gym Book Limited | Wholesale & retail | 2021 |
| Little Lanterns Care Ltd | Health & social care | 2025 |
| Little M Production Limited | Wholesale & retail | 2024 |
| Little Magic by Sonika Ltd | Wholesale & retail | 2023 |
| Little Pink Frog Limited | Professional & scientific | 2014 |
| Little Red Pizza Company (Altrincham) Limited | Hospitality | 2019 |
| Little Shop for Scholars Ltd. | Hospitality | 2017 |
| Little Sprites Limited | Wholesale & retail | 2016 |
| Little Weavers Day Nursery Limited | Education | 2010 |
| Little World for Scholars Ltd. | Education | 2018 |
| Littledales Park (Hartford) Management Company Limited | Households | 2006 |
| LIU Optometric Consultants Limited | Health & social care | 2015 |
| LIV to Pitch Limited | Information & communication | 2016 |
| Live Long Live Well Ltd | Health & social care | 2020 |
| Live Louder Limited | Wholesale & retail | 2015 |
| Liveaction UK Limited | Information & communication | 2016 |
| Liveconvenience Limited | Wholesale & retail | 2025 |
| Livi International Ltd | Wholesale & retail | 2025 |
| Living Hope Ventures Ltd | Hospitality | 2023 |
| Living Jesus Tabernacle | Other services | 2013 |
| Living Rock 182 Ltd | Real estate | 2025 |
| Living Smart Ltd | Real estate | 2016 |
| Living Smart Property Ltd | Real estate | 2006 |
| Living Without Sight Limited | Health & social care | 2007 |
| Livinhill Limited | Administrative & support | 2005 |
| LIZ Synnott Limited | Professional & scientific | 2021 |
| LIZ Thomas Consulting Limited | Professional & scientific | 2022 |
| LJE Consulting Limited | Professional & scientific | 2025 |
| LJO Consultancy Limited | Professional & scientific | 2024 |
| LJO Talent Limited | Professional & scientific | 2026 |
| Ljoe Medical Services Limited | Health & social care | 2019 |
| LK Fashion UK Ltd | Manufacturing | 2023 |
| LK Teachings Ltd | Health & social care | 2021 |
| Lkla Delivery Ltd | Transport & logistics | 2023 |
| Lkts Energy Limited | Professional & scientific | 2025 |
| LKY Engineering and Management Ltd | Professional & scientific | 2019 |
| Llanbedrog Headland Company Limited | Real estate | 2015 |
| Lloyd Aviation Services Limited | Professional & scientific | 2026 |
| Lloyd Street Dental Practice Ltd | Health & social care | 2020 |
| Lloyd-Davies Associates Limited | Administrative & support | 2013 |
| Lloyds Chambers Estates Ltd | Real estate | 2026 |
| LM Cheshire Properties Limited | Real estate | 2023 |
| LM85 Holdings Ltd | Financial services | 2026 |
| LMC Hairdressing Limited | Other services | 2024 |
| Lmnop Group Limited | Wholesale & retail | 2025 |
| LMO Property Limited | Administrative & support | 2015 |
| LMR Accountancy Limited | Professional & scientific | 2023 |
| LMS Change Management Limited | Professional & scientific | 2022 |
| LMT3 Investments Limited | Real estate | 2024 |
| LN Info Limited | Information & communication | 2017 |
| Loaf Orthopaedics Ltd | Health & social care | 2019 |
| Loafd Ltd | Wholesale & retail | 2025 |
| Loah Property Ltd | Real estate | 2024 |
| Lobley Solutions Limited | Professional & scientific | 2016 |
| Lobster Publishing Limited | Information & communication | 2014 |
| Lobster Theremin Limited | Information & communication | 2014 |
| LOC One Limited | Information & communication | 2015 |
| Loc-Nar Technology Limited | Professional & scientific | 2025 |
| Lochlan Ltd | Financial services | 2018 |
| Lochside Computing Limited | Information & communication | 2023 |
| Lochwood Abbey Court Limited | Real estate | 2025 |
| Lochwood Care Limited | Health & social care | 2025 |
| Loco Padel Ltd | Arts & recreation | 2026 |
| Locum Network Ltd | Professional & scientific | 2012 |
| Lodge Park Road Management Co. Limited | Households | 1983 |
| Lodge Service Station Limited | Wholesale & retail | 2007 |
| Lodsworth Consultancy Services Limited | Information & communication | 2025 |
| Loft 19 Design Ltd | Information & communication | 2012 |
| Lofthouse Builders Limited | Construction | 2003 |
| Logan TOD & Company Limited | Information & communication | 2017 |
| Logic Theorist Limited | Information & communication | 2022 |
| Logicsquare Ltd | Information & communication | 2015 |
| Logixx PPM Solutions Limited | Professional & scientific | 2021 |
| Logyk Consultancy Ltd | Information & communication | 2024 |
| Lokalise UK Ltd | Information & communication | 2024 |
| Lolacoaster Ltd | Information & communication | 2021 |
| Lomida Limited | Financial services | 2014 |
| Lomtec (UK) Ltd | Information & communication | 2002 |
| London Academy of Aesthetic Medicine Ltd | Education | 2019 |
| London Ceramics Limited | Professional & scientific | 2014 |
| London Economic Forum Limited | Information & communication | 2025 |
| London EYE Bespoke Eyewear Limited | Extraterritorial | 2012 |
| London International Disputes Week Limited | Administrative & support | 2019 |
| London Unreal Labs Ltd | Information & communication | 2025 |
| Long Stay 1 GP LLP | | 2023 |
| Long Stay 1 LP | | 2023 |
| Long Stay 2 LLP | | 2025 |
| Long Stay 2 LP | | 2025 |
| Longautos Ltd | Wholesale & retail | 2025 |
| Longford Lodge Management Company Limited | Households | 2021 |
| Longley Property Limited | Construction | 2025 |
| Longridge Trading Estate Services Limited | Real estate | 1995 |
| Longservice.Com Ltd | Administrative & support | 2002 |
| Longsight Limited | Real estate | 2004 |
| Longworth & Taylor Limited | Real estate | 1931 |
| Looft UK Limited | Manufacturing | 2024 |
| Lookfantastic Franchising Limited | Wholesale & retail | 2005 |