| Levente's Trading Limited | Extraterritorial | 2011 |
| Lever Holmes Limited | Real estate | 2023 |
| Levi Associates Ltd | Administrative & support | 2010 |
| Levi Strauss (U.K.) Limited | Administrative & support | 1966 |
| Levi Strauss Pension Trustee Limited | Professional & scientific | 1982 |
| Levi-D Company Ltd | Administrative & support | 2025 |
| Levirg Flooring Limited | Construction | 2017 |
| Lewis & SON Accountants Limited | Professional & scientific | 2010 |
| Lewis Brown Investments Ltd | Hospitality | 2025 |
| Lewis Community Enterprise UK Limited | Wholesale & retail | 2026 |
| Lewis Humphrey Plastering Limited | Construction | 2024 |
| Lewisham E Foods Ltd. | Hospitality | 2019 |
| Lewispaul Ltd | Manufacturing | 2016 |
| Lewyn Ltd | Construction | 2025 |
| LEX Construction Ltd | Construction | 2025 |
| LEX Foundation | Financial services | 2018 |
| LEX Generate Limited | Professional & scientific | 2018 |
| LEX Insight Solutions Ltd | Information & communication | 2024 |
| LEX Way Service Limited | Construction | 2015 |
| Lexwell Legal Services Limited | Professional & scientific | 2026 |
| Lexy-Line Ltd | Construction | 2024 |
| Leyland Packaging Limited | Extraterritorial | 1997 |
| LF Data Comms Ltd | Construction | 2023 |
| LF Entertainment Ltd | Hospitality | 2025 |
| LF Plant Limited | Administrative & support | 2014 |
| LF Solutions Limited | Construction | 2012 |
| LF97 Joinery Limited | Manufacturing | 2023 |
| LF97 Property Ltd | Real estate | 2024 |
| LFW Enterprise Ltd | Hospitality | 2019 |
| LG 1ST Limited | Information & communication | 2025 |
| LG Collections Limited | Transport & logistics | 2018 |
| LG Properties (Northampton) Ltd | Real estate | 2016 |
| LGG Logistics Ltd | Transport & logistics | 2022 |
| Lgsa Ltd | Arts & recreation | 2015 |
| Lgsg Holdings Limited | Wholesale & retail | 2024 |
| LGT Products Limited | Wholesale & retail | 2016 |
| LGV Holdings Limited | Financial services | 2022 |
| LGV Trainers Limited | Education | 2017 |
| LH (Northampton) Limited | Construction | 2025 |
| LH Retail Development Ltd | Professional & scientific | 2023 |
| Lhbr Ltd | Hospitality | 2016 |
| LHH RTM Company Limited | Other services | 2015 |
| LHS Adjusting Ltd | Financial services | 2022 |
| Libasuk Ltd | Wholesale & retail | 2025 |
| Liberty Agents Developments Ltd | Information & communication | 2025 |
| Liberty Construction Services Limited | Construction | 2017 |
| Libertypay Limited | Administrative & support | 2015 |
| Libihi Consultancy Limited | Information & communication | 2014 |
| Libra 001 Limited | Construction | 2013 |
| Lichfield Property Developments Ltd | Construction | 2017 |
| Lidaconsulting Ltd | Professional & scientific | 2025 |
| Liebestraum Ltd | Wholesale & retail | 2016 |
| Life & Home Ltd | Construction | 2025 |
| Life Beyond Words Limited | Extraterritorial | 2025 |
| Life Body Health Ltd | Health & social care | 2022 |
| Life Force Fitness Limited | Arts & recreation | 2017 |
| Life in the Story Ltd | Education | 2020 |
| Life IS Sweet (Northampton) Limited | Wholesale & retail | 2022 |
| Life Science Data Ltd | Professional & scientific | 2015 |
| Life Space Design Studio Ltd | Professional & scientific | 2014 |
| Life WIN Recruitment Limited | Health & social care | 2019 |
| Life-Force School of Counselling Limited | Health & social care | 1995 |
| Lifeld Ltd | Construction | 2019 |
| Lifeline Family Care Limited | Education | 1998 |
| Lifescend Events Ltd | Education | 2026 |
| Lifeskills Solutions Limited | Education | 2002 |
| Lifespace Consultancy Limited | Professional & scientific | 2025 |
| Lifesprings Care Services Ltd | Health & social care | 2015 |
| Lifestyle Commoditides Ltd | Wholesale & retail | 2024 |
| Lifestyle Flooring Northampton Ltd | Wholesale & retail | 2017 |
| Lifestyle Lifts Limited | Administrative & support | 2014 |
| Lifewell Healthcare Ltd | Hospitality | 2023 |
| Lifeworks Consulting Ltd | Administrative & support | 2023 |
| Lifting Equipment Supplies (Daventry) Limited | Manufacturing | 2014 |
| Lifting Equipment Supplies Limited | Manufacturing | 2000 |
| Light Enterprises Limited | Information & communication | 2017 |
| Light Technik Limited | Information & communication | 2010 |
| Lightbox One (Management) Limited | Households | 2001 |
| Lightboxmm Ltd | Households | 2020 |
| Lighted Limited | Wholesale & retail | 2015 |
| Lighthouse Autos Ltd | Wholesale & retail | 2023 |
| Lighthouse Care Ltd | Administrative & support | 2009 |
| Lighthouse Holdings Ltd | Information & communication | 2023 |
| Lighthouse Home Cleaning Ltd | Administrative & support | 2008 |
| Lighthouse Land and Homes Ltd | Hospitality | 2023 |
| Lighthouse London Studio Limited | Information & communication | 2013 |
| Lightning Promotions Ltd | Professional & scientific | 2020 |
| Lights R on Ltd | Construction | 2016 |
| Ligraproof Limited | Extraterritorial | 1990 |
| Lijo George Ltd | Professional & scientific | 2023 |
| Like a Boss Consulting Limited | Administrative & support | 2018 |
| Like-Minded Christians | Other services | 2012 |
| Likenew. Ltd | Administrative & support | 2026 |
| Lilac Technology Unlimited | Information & communication | 2000 |
| Lilford Associates Limited | Real estate | 2000 |
| Lilipl Ltd | Transport & logistics | 2011 |
| Lillibet Court Care Limited | Health & social care | 2017 |
| Lilly Healthcare Ltd | Health & social care | 2012 |
| Lillybez Limited | Households | 2026 |
| Lillybrooke Ltd | Financial services | 2017 |