| Lewie's Cafes Ltd | Manufacturing | 2025 |
| Lewis & Bush Properties Limited | Real estate | 2024 |
| Lewis Norton Limited | Administrative & support | 2004 |
| Lewis Townend Electrical Limited | Construction | 2017 |
| Lewisham National Reserve Club Limited | Other services | 1920 |
| Lexar Services Limited | Professional & scientific | 2017 |
| Lexhill Homes Limited | | 1973 |
| Lexona Ltd | Construction | 2017 |
| Leys Management Company Limited(The) | Real estate | 1985 |
| LF Box Ltd | Hospitality | 2022 |
| LF Roofing Limited | Construction | 2026 |
| LF Talking Therapies Limited | Professional & scientific | 2022 |
| LFD Property Developments Ltd | Real estate | 2024 |
| LFM Management (Bournemouth) Ltd | Households | 2022 |
| LGL Flexi Ltd | Transport & logistics | 2025 |
| LH Brickwork & Building Ltd | Construction | 2024 |
| LH Ecommerce Ventures Limited | Wholesale & retail | 2025 |
| LHA Design Ltd | Professional & scientific | 2016 |
| LI Homes Ltd | Construction | 2019 |
| Liaise Limited | Public administration | 2018 |
| Liaison Home Care Ltd | Health & social care | 2019 |
| Libertas Financial Planning Ltd | Financial services | 2014 |
| Liberty Camper Conversions (Poole) Limited | Manufacturing | 2023 |
| Liberty GB Limited | Construction | 2007 |
| Liberty Holdings (Kent) Limited | Financial services | 2020 |
| Liberty Investments (Kent) Limited | Real estate | 2020 |
| Library Mews (Poole) Management Limited | Households | 2010 |
| Lieng's Limited | Hospitality | 2023 |
| Life and Easy Limited | Financial services | 2005 |
| Life Changing Choices Ltd | Arts & recreation | 2024 |
| Life Hub Ltd | Health & social care | 2022 |
| Life Imitates Data Ltd | Information & communication | 2025 |
| Life Support Network Limited | Health & social care | 2025 |
| Life-Friendly Business Ltd | Administrative & support | 2018 |
| Lifedirect Supported Living Limited | Health & social care | 2024 |
| Lifeline Champions CIC | Education | 2026 |
| Lifestyle Agenda Ltd | Wholesale & retail | 2025 |
| Lifestyle Cars Limited | Wholesale & retail | 2003 |
| Lift Coffee Holdings Limited | Financial services | 2022 |
| Lift Coffee Kensington Limited | Hospitality | 2017 |
| Lift Coffee Roasters Ltd | Manufacturing | 2022 |
| Lift Coffee Shoreditch Ltd | Hospitality | 2023 |
| Lifting Operations UK Ltd | Construction | 2015 |
| Light Cason Associates Limited | Financial services | 2011 |
| Light for Bulgaria Limited | Health & social care | 2002 |
| Lighthouse Counselling Ltd | Health & social care | 2020 |
| Lighthouse Healing Ltd | Health & social care | 2024 |
| Lightyear Foundation Ltd | Education | 2012 |
| Liima Coffee Ltd | Wholesale & retail | 2025 |
| Like IT IS Media Limited | Information & communication | 2014 |
| Likoni Management Company Limited | Households | 2017 |
| LIL BLU Properties Ltd | Real estate | 2023 |
| Lila Dance C.I.C. | Arts & recreation | 2012 |
| Lilah Limited | Wholesale & retail | 2025 |
| Lilliput Home Care Services Limited | Health & social care | 2020 |
| Lilliput II Limited | Real estate | 2017 |
| Lilliput Management Limited | Real estate | 1954 |
| Lilola Interior Design Ltd | Other services | 2024 |
| Lily & Fred Hair & Beauty Ltd | Other services | 2021 |
| Lily Elletson Ltd | Professional & scientific | 2023 |
| Lilycross (IOW) Management Company Ltd | Households | 2023 |
| Lilyxai Ltd | Information & communication | 2026 |
| Lima Accommodation Ltd | Real estate | 2022 |
| Lima Apartments Ltd | Real estate | 2021 |
| Limapropertymanagement Ltd | Real estate | 2019 |
| Limbachiya Distribution Ltd | Wholesale & retail | 2025 |
| Lime Estates Rental Properties Limited | Real estate | 2025 |
| Lime Estates Rental Properties NO.2 Limited | Real estate | 2025 |
| Lime TEN Holdings Limited | Financial services | 2017 |
| Lime TEN Ltd. | Information & communication | 2012 |
| Limetools Limited | Information & communication | 2013 |
| Limitless Learning Pathways Ltd | Education | 2026 |
| Limitless Leisure Limited | Construction | 2025 |
| Limitless Tattoo Studio Ltd | Other services | 2025 |
| Lincoln Lodge Limited | Households | 2001 |
| Lindale 462 Ltd | Real estate | 2019 |
| Linden 29 Management Limited | Households | 1999 |
| Lindonnetworks Ltd | Information & communication | 2018 |
| Lindsay Court (Poole) Residents Association Limited | Households | 1971 |
| Lindsay Manor Management Company Limited | Households | 1974 |
| Lindsay Surgical Supplies Limited | Wholesale & retail | 2002 |
| Linee Nordiche Ltd | Administrative & support | 2024 |
| Linford Land and Developments Limited | Construction | 2007 |
| Lingfield Grange Freehold Limited | Households | 2012 |
| Link 35 Management Company Limited | Households | 1986 |
| Link Advisory Ltd | Professional & scientific | 2017 |
| Link PUB Co Ltd. | Hospitality | 2019 |
| Link Travel Ltd | Transport & logistics | 2023 |
| Link Travel Pool Ltd | Transport & logistics | 2024 |
| Linkfield Court (Bournemouth) Limited | Health & social care | 1987 |
| Links App Ltd | Information & communication | 2023 |
| Links Management Company (Bournemouth) Limited | Households | 1971 |
| Linksview Management Company Limited | Households | 1996 |
| Linton Lawns (Ferndown) Maintenance Company Limited | Households | 1972 |
| Linux Embedded Ltd | Information & communication | 2014 |
| Linwood Properties Limited | Real estate | 2021 |
| Lion Guard Financial Ltd | Financial services | 2020 |
| Lion Lock Storage Ltd | Transport & logistics | 2026 |
| Lionco Ltd | Real estate | 2012 |
| LIP Service Medical Aesthetics Ltd | Health & social care | 2024 |