| Lifestyle Loans NO 1 Ltd | Financial services | 2018 |
| Lifetime Services Ltd | Professional & scientific | 2020 |
| Liffey Court Management Company Limited | Households | 1998 |
| Light Haul Limited | Transport & logistics | 2016 |
| Light Steel Frame Association | Other services | 2019 |
| Lightness Limited | Information & communication | 2006 |
| Lightsource UK Limited | Construction | 2023 |
| Lightwork Resells Ltd | Wholesale & retail | 2023 |
| Like Education Associates Ltd | Professional & scientific | 2024 |
| Lilakshop Limited | Wholesale & retail | 2024 |
| Liliana Wellings Viajes Ltd | Other services | 2025 |
| Lille Racewear Limited | Manufacturing | 2019 |
| Lily Street Farm (Swanwick) Residents Management Company Limited | Real estate | 2022 |
| Lilymairea Ltd | Manufacturing | 2026 |
| Lilyslovecare Ltd | Health & social care | 2025 |
| Limberlost Close (1-25) RTM Company Ltd | Households | 2022 |
| Limbic Training Ltd | Professional & scientific | 2018 |
| Lime Business Consulting Ltd | Administrative & support | 2023 |
| Lime Grove (Ramsgate) Management Company Limited | Households | 2005 |
| Limes Paddock Management Limited | Households | 2016 |
| Limeshore Management Ltd | Professional & scientific | 2023 |
| Linden Close Management Company Ltd | Households | 2019 |
| Linden Mews Residents Company Limited | Households | 2004 |
| Line Catalyst Limited | Professional & scientific | 2025 |
| Linea Group Services Limited | Professional & scientific | 2018 |
| Linea Solutions Limited | Professional & scientific | 1998 |
| Lingard Styles Limited | Professional & scientific | 2001 |
| Linked Technology Limited | Information & communication | 2004 |
| Linkhill Design Ltd | Professional & scientific | 2025 |
| Links Living Group Ltd | Real estate | 2024 |
| Links Residential Developments (Castle) Limited | Construction | 2022 |
| Links Residential Developments (Crescent Street) Limited | Construction | 2022 |
| Links Residential Developments (Llanbrynmair) Limited | Construction | 2022 |
| Links Residential Developments (Llanidloes) Limited | Construction | 2022 |
| Links Residential Developments Limited | Construction | 2019 |
| Lintonite Limited | Education | 1980 |
| Lionstiger Limited | Extraterritorial | 2021 |
| Liquid Mineral Services Limited | Manufacturing | 2001 |
| Lisa Farebrother Limited | Professional & scientific | 2013 |
| Lisle Court Management Limited | Households | 2001 |
| Lismore Management Limited | Households | 2018 |
| Lisst ME UK Limited | Administrative & support | 2013 |
| Listen Audio Ltd | Wholesale & retail | 2019 |
| Listers Holdings Limited | Financial services | 2025 |
| Lite Media Limited | Information & communication | 2015 |
| Lithium Property Limited | Real estate | 2019 |
| Little Garage Media Limited | Professional & scientific | 2016 |
| Little Greenfields Preschool CIC | Education | 2012 |
| Little Keys Ltd | Real estate | 2019 |
| Little Longstone Holiday Cottages Limited | Households | 2025 |
| Little Lovebum Ltd | Wholesale & retail | 2020 |
| Little Mika Ltd | Wholesale & retail | 2019 |
| Little Motor Company Ltd | Wholesale & retail | 2017 |
| Little Nell Jewellery Limited | Wholesale & retail | 2022 |
| Little Pixies Nursery Limited | Education | 2019 |
| Little Wellness Retreat Ltd | Wholesale & retail | 2019 |
| Littlegemfx Ltd | Arts & recreation | 2017 |
| Littlehampton at the Park Management Company Limited | Households | 2022 |
| Littlelivesabc Ltd | Education | 2026 |
| Littlemoors Developments Limited | Real estate | 2003 |
| LIV Interiors Limited | Construction | 2023 |
| Live Life Full Services Ltd | Health & social care | 2025 |
| Livermore Court Limited | Households | 1984 |
| Livestockwise Limited | Professional & scientific | 2001 |
| Livewello Limited | Information & communication | 2017 |
| Livewired Ltd | Professional & scientific | 2024 |
| Living With Arthritis Ltd | Health & social care | 2025 |
| Livingston Hargreaves Apartments Limited | Households | 2007 |
| LIZ Snaith Consultants Ltd | Information & communication | 2006 |
| LJB Bookkeeping and Payroll Services Ltd | Professional & scientific | 2025 |
| LJE Electrical Contracting Services Ltd | Construction | 2019 |
| LK Routes Ltd | Information & communication | 2026 |
| LK8 Limited | Professional & scientific | 2014 |
| Llangynyw Marketing Limited | Real estate | 2009 |
| Lldma Consulting Limited | Professional & scientific | 2017 |
| Llewellyn Place (Nettles Lane) Management Company Limited | Households | 2006 |
| Lloyd House Estates Limited | Real estate | 2021 |
| Lloyds Assessment Services Ltd | Education | 2026 |
| Lloyds Plastering Services Ltd | Construction | 2026 |
| Llys-Y-Garnedd (Bangor) Management Limited | Households | 2007 |
| LMB Properties Limited | Real estate | 1996 |
| LMD Health Limited | Health & social care | 2025 |
| Lmgc Management Limited | Households | 2007 |
| LN Leasing Ltd | Administrative & support | 2020 |
| Lobster House Holiday Homes Ltd | Hospitality | 2023 |
| Local Eats Ltd | Hospitality | 2024 |
| Lock, Stock and Barrel Solutions Limited | Information & communication | 2003 |
| Locke Staffing Group Ltd | Administrative & support | 2021 |
| Locklewis Limited | Real estate | 2025 |
| Lockyer Partners Ltd | Information & communication | 2019 |
| Locus Point Limited | Hospitality | 2022 |
| Lodestar-Delta Limited | Manufacturing | 1997 |
| Lodge Digital Ltd | Information & communication | 2018 |
| Lodge Farm Liveries Limited | Agriculture & fishing | 2025 |
| Lohas Farm Ltd | Agriculture & fishing | 2026 |
| Lojk Solutions Ltd | Information & communication | 2011 |
| London Coin Fairs Limited | Administrative & support | 2002 |
| Long Itchington (Marton Road) Management Company Limited | Real estate | 2016 |
| Long Lane (Beverley) Management Company Limited | Real estate | 2023 |
| Long Mountain Electrical Limited | Construction | 2004 |