| Lewis Casterton Limited | Professional & scientific | 2025 |
| Lewis Holbrook Mechanical Ltd | Construction | 2026 |
| Lewis Risk Consulting Ltd | Professional & scientific | 2017 |
| Lexibleai Ltd | Information & communication | 2025 |
| Lexico UK Limited | Information & communication | 2017 |
| Lexro Ltd | Professional & scientific | 2022 |
| Lexy's Tights Ltd | Manufacturing | 2024 |
| Leys Cottage Ltd | Hospitality | 2023 |
| LF Lovers Ltd | Real estate | 2019 |
| LFD Assets Ltd | Real estate | 2019 |
| LFD Legal Services Limited | Professional & scientific | 2022 |
| LFP Group Ltd | Hospitality | 2025 |
| LFT Ovrs Ltd | Manufacturing | 2023 |
| LG Partnership Ltd | Wholesale & retail | 2022 |
| Lgdeans Electrical Limited | Construction | 2022 |
| Lgenx Ltd | Wholesale & retail | 2025 |
| LGW Property(Chelt) Ltd | Construction | 2025 |
| LH Development (Glos) Ltd | Construction | 2018 |
| LHC2 Ltd | Financial services | 2025 |
| Lhjk Strata Ltd | Hospitality | 2025 |
| LHR Group Holdings Ltd | Administrative & support | 2026 |
| Liam Kennedy Consultancy Ltd | Health & social care | 2024 |
| Liam Tyler Rentals Ltd | Real estate | 2022 |
| Libertus Court Management Limited | Administrative & support | 1980 |
| Licata Lettings Ltd | Real estate | 2025 |
| Licentis Technical | Professional & scientific | 2016 |
| LID Accounting Solutions Ltd | Professional & scientific | 2020 |
| Life Assets Property Income Ltd | Real estate | 2021 |
| Life Legacy Limited | Agriculture & fishing | 2025 |
| Life SCI MED Tech Ltd | Professional & scientific | 2022 |
| Lifebrook Investments Ltd | Financial services | 2023 |
| Lifeline Products Ltd | Construction | 2008 |
| Lifepulse Limited | Professional & scientific | 2019 |
| Lifescience Products Limited | Manufacturing | 1993 |
| Lifespace Properties Limited | Real estate | 2015 |
| Lifetime Opportunities Ltd | Health & social care | 2004 |
| Lifting the Blues | Health & social care | 2016 |
| Liftoff Consulting Services Ltd | Professional & scientific | 2017 |
| Light Admiralty Grey Ltd. | Information & communication | 2013 |
| Light Developments Limited | Hospitality | 2002 |
| Light Emitting Data Limited | Professional & scientific | 2024 |
| Light Group Limited | Hospitality | 2003 |
| Light Management UK Limited | Financial services | 2022 |
| Light Parks & Leisure LLP | | 2012 |
| Light UK Holdings Limited | Real estate | 2022 |
| Lightbody Developments Limited | Construction | 2024 |
| Lightfoot Anaesthesia Ltd | Health & social care | 2019 |
| Lightmoor Homes Limited | Construction | 1996 |
| Lightning Leadership Ltd | Professional & scientific | 2024 |
| Likeable Technology Ltd | Professional & scientific | 2018 |
| Lilia Studio Ltd | Wholesale & retail | 2025 |
| Lilian Faithfull Care | Health & social care | 2007 |
| Lilian Faithfull Homes Limited | Extraterritorial | 2020 |
| Lilian Faithfull Trading Limited | Health & social care | 1994 |
| Lilibee Developments Ltd | Professional & scientific | 2006 |
| Lilly Browns Limited | Wholesale & retail | 2007 |
| Lilly Hall Farm LLP | | 2015 |
| Lily P’S Properties Ltd | Real estate | 2024 |
| Limacons Limited | Information & communication | 2020 |
| Limbr Resourcing Ltd | Administrative & support | 2014 |
| Limbrick Construction Limited | Construction | 2022 |
| Limbrick Limited | Extraterritorial | 2012 |
| Limbrick Studio Ltd | Professional & scientific | 2017 |
| Lime Grove (Norton) Management Company Limited | Households | 2018 |
| Lime Tree Court (Hunts Grove) Management Company Limited | Extraterritorial | 2014 |
| Lime Tree Property Developments Limited | Real estate | 2016 |
| Lime Tree QS Services Ltd | Professional & scientific | 2024 |
| Limeheath Electrical Limited | Administrative & support | 2008 |
| Limes Hair Company Limited | Other services | 2006 |
| Limes Priory Street (Cheltenham) Residents Company Limited(The) | Households | 1984 |
| Limestone Financial Planning Ltd | Professional & scientific | 2021 |
| Lin's Lucky House Ltd | Hospitality | 2019 |
| Linac Limited | Information & communication | 1998 |
| Linc Trading Limited | Health & social care | 2010 |
| Linda Lloyd Homes Ltd | Construction | 2013 |
| Linda Prewett Limited | Financial services | 2008 |
| Lindav Limited | Financial services | 2024 |
| Lindisfarne House (Management) Limited | Households | 1982 |
| Lindley Dental Centre Limited | Health & social care | 2014 |
| Lindsey Higgins Interior Design Ltd | Other services | 2019 |
| Linear Services (Glos) Ltd | Financial services | 2010 |
| Link Holdco Ltd | Financial services | 2022 |
| Link-Up Ltd. | Wholesale & retail | 1994 |
| Linkburn Limited | Extraterritorial | 2006 |
| Linkchoice Limited | Professional & scientific | 1997 |
| Linkprops Limited | Households | 2019 |
| Linkpropsw Limited | Real estate | 2021 |
| Linsto Limited | Professional & scientific | 2009 |
| Linus Biotechnology Ltd | Administrative & support | 2024 |
| Linx Fire Limited | Other services | 2009 |
| Lion Supplies Limited | Financial services | 2002 |
| Lion's DEN Communications Limited | Information & communication | 1995 |
| Lionel Laine Property Limited | Real estate | 2022 |
| Lions Dawn Consulting Limited | Professional & scientific | 2011 |
| Lionsgate Property Ltd | Real estate | 2021 |
| Lionwasp Limited | Extraterritorial | 2021 |
| Liquid Filtration Limited | Manufacturing | 2018 |
| LIS International Ltd | Construction | 2023 |
| Lister Consultancy Ltd | Professional & scientific | 2020 |
| Lister Quadrant Ltd | Professional & scientific | 2025 |