| Lechbbey Limited | Wholesale & retail | 2025 |
| LED Retro Limited | Wholesale & retail | 2025 |
| LED Spares Limited | Wholesale & retail | 2020 |
| LED Tape UK Limited | Wholesale & retail | 2025 |
| Leefar Nutrition UK Ltd | Wholesale & retail | 2025 |
| Leese Bros. (Eccleshall) Limited | Wholesale & retail | 1962 |
| Leese Systems Limited | Construction | 2014 |
| Legacy and Favour Group Ltd | Construction | 2026 |
| Legalinks Consultant Limited | Information & communication | 2025 |
| Leggo Ltd | Real estate | 2004 |
| Leggy Design House Limited | Professional & scientific | 2018 |
| Legion Landscaping & Building Ltd | Administrative & support | 2025 |
| Leigh Holdings (Midlands) Ltd | Financial services | 2023 |
| Leigh Kenny Wealth Solutions Limited | Professional & scientific | 2017 |
| Leigh Plant Limited | Arts & recreation | 1974 |
| Leigh Project Management Ltd | Professional & scientific | 2023 |
| Leisure Care (Midlands) Limited | Manufacturing | 2024 |
| Lemon Tree Care Solutions Ltd | Administrative & support | 2019 |
| Leneage Property Portfolio Limited | Households | 2025 |
| Lennovos Limited | Administrative & support | 2025 |
| Lennox Automotive Limited | Other services | 2016 |
| Leonn Co Ltd | Wholesale & retail | 2025 |
| Leons Asset Management Limited | Transport & logistics | 2001 |
| Leons Coach Travel (Stafford) Limited | Transport & logistics | 1978 |
| Leons Properties Limited | Real estate | 2010 |
| Leons Travel Group Limited | Transport & logistics | 2010 |
| Leons Travel Limited | Transport & logistics | 1997 |
| Lester Beck Ltd | Real estate | 2024 |
| Let's Dance With Nicole Limited | Arts & recreation | 2024 |
| Lete Maritime Ltd. | Extraterritorial | 2017 |
| Lets Getting Rich Ltd | Wholesale & retail | 2025 |
| Letterbox Treasures Ltd | Wholesale & retail | 2022 |
| Letting Lane Ltd | Real estate | 2021 |
| Level Road Driver Training Limited | Education | 2012 |
| Level UP AI Limited | Education | 2023 |
| LEVEL9 Properties Ltd | Real estate | 2026 |
| Lewcy Ltd | Financial services | 2022 |
| Lewis 42 Ltd | Information & communication | 2024 |
| Lewis Lunn Limited | Wholesale & retail | 2024 |
| LEX Opus Limited | Professional & scientific | 2022 |
| LH Vulcanising Ltd | Mining & quarrying | 2025 |
| LI Aurora Ltd | Wholesale & retail | 2023 |
| Lianbang Trading (UK) Limited | Wholesale & retail | 2025 |
| Lianchao Worldwide Limited | Extraterritorial | 2016 |
| Lianne Hartley Solutions Limited | Professional & scientific | 2023 |
| Liat Ltd | Professional & scientific | 2023 |
| Liberandum Consulting Ltd | Information & communication | 2021 |
| Liberlve Ltd | Wholesale & retail | 2025 |
| Lichfield Business Ltd | Hospitality | 2018 |
| Lida Industry Limited | Extraterritorial | 2016 |
| Life App Technology Limited | Wholesale & retail | 2021 |
| Life Christian Church Ltd | Other services | 2015 |
| Lift DSP Limited | Professional & scientific | 2019 |
| Lighthouse Caterers Ltd | Hospitality | 2024 |
| Lighthouse Property Searches Ltd | Professional & scientific | 2009 |
| Lightworks (UK) Lighting Ltd | Wholesale & retail | 2013 |
| Lika Trading Co., Ltd | Wholesale & retail | 2024 |
| LIL Missy Hair Company (Holdings) Ltd | Other services | 2022 |
| LIL Missy Hair Company Ltd | Other services | 2022 |
| Lilac Productions Limited | Information & communication | 2010 |
| Lilklbldlm Ltd | Wholesale & retail | 2025 |
| Limelight Energy Limited | Energy | 2015 |
| Limitless Technology Solutions Limited | Information & communication | 2026 |
| Limteunyuz Ltd | Wholesale & retail | 2025 |
| Lincbuy Ltd | Wholesale & retail | 2025 |
| Lingbi Book Garden Limited | Wholesale & retail | 2025 |
| Lingerie-Source Limited | Manufacturing | 2024 |
| Lingoberry Ltd | Wholesale & retail | 2023 |
| Lingxiang Business Limited | Wholesale & retail | 2025 |
| Linping Management Limited | Professional & scientific | 2022 |
| Linwei Wide Quantum Network Information Technology Group Co., Ltd | Wholesale & retail | 2025 |
| Linyi Shuanghe Industrial Co., Ltd. | Professional & scientific | 2014 |
| Linyuend Limited | Wholesale & retail | 2025 |
| Lion & Dragon Security Ltd | Administrative & support | 2026 |
| Lion Care Service Limited | Health & social care | 2016 |
| Liquid Animal Feed Holdings Limited | Financial services | 2025 |
| Liquid Media Marketing Limited | Professional & scientific | 2019 |
| Liquidjelly Limited | Information & communication | 2011 |
| Lisa Galley Autism Consultancy & Training Ltd | Other services | 2024 |
| Lisa Ings Animal Services Ltd | Education | 2025 |
| Lisa Jackson Consultancy Ltd | Financial services | 2021 |
| Litex Trading Co., Limited | Wholesale & retail | 2025 |
| Lith Technology Co., Ltd | Wholesale & retail | 2013 |
| Little Farmers Day Nursery Limited | Health & social care | 2025 |
| Little Gym Stars Ltd | Education | 2023 |
| Little Ingestre Barns Management Company Limited | Households | 2025 |
| Little Kinvaston School Ltd | Education | 2023 |
| Little Legends Day Nursery Ltd | Health & social care | 2026 |
| Little Mansion Investments Ltd | Real estate | 2011 |
| Little Mansions Ltd | Real estate | 2011 |
| Little Red FOX Play Cafe Ltd | Hospitality | 2024 |
| Little Rippers MTB Ltd | Other services | 2018 |
| Little Robin's Day Nurseries Limited | Real estate | 2014 |
| Little Serapone Ltd | Extraterritorial | 2025 |
| Littlehales Plant Hire Limited | Administrative & support | 2006 |
| Littywood Farm Limited | Agriculture & fishing | 2007 |
| Littywood Manor Events Ltd | Hospitality | 2020 |
| LIU Wright Ltd | Professional & scientific | 2022 |
| Livana Limited | Information & communication | 2015 |
| Live Services Limited | Professional & scientific | 2015 |