| LC Web Services Ltd | Information & communication | 2018 |
| Lcea Limited | Administrative & support | 2008 |
| Lchain Ltd | Wholesale & retail | 2020 |
| LDT Pro Consult Ltd. | Information & communication | 2024 |
| LE Saviour Agency Ltd | Wholesale & retail | 2025 |
| Leading Property Management Ltd | Hospitality | 2025 |
| Leadsafe Studio Ltd | Professional & scientific | 2025 |
| Leaksolve AI Ltd | Information & communication | 2026 |
| Lean Management Limited | Wholesale & retail | 1992 |
| Learniverse Land Ltd | Education | 2025 |
| Lebtek Ltd | Other services | 2014 |
| Ledborough Properties Ltd | Real estate | 2026 |
| LEE Clare Ltd | Health & social care | 2022 |
| LEE Cousins Design Ltd | Professional & scientific | 2013 |
| Lee-Dickens Limited | Manufacturing | 1962 |
| Leeluja Ltd | Health & social care | 2022 |
| Leeson Properties Limited | Real estate | 2018 |
| Leeukop Limited | Extraterritorial | 2014 |
| Legacy Supported Living Limited | Health & social care | 2017 |
| Leisan Ltd | Health & social care | 2022 |
| Leisure Management Limited | Hospitality | 2008 |
| Lemon Grove Counselling & Therapy Limited | Health & social care | 2012 |
| Lemon Tech Ltd | Professional & scientific | 2016 |
| LEN Griffiths (Forklift Services) Limited | Manufacturing | 2002 |
| Lenbus IT Services Ltd | Information & communication | 2020 |
| Leoch Battery UK Ltd | Wholesale & retail | 2015 |
| Leonard Walter Limited | Information & communication | 2015 |
| LET IT (Wellingborough) Limited | Real estate | 2007 |
| Let's Instruct Driving Instructor Academy Limited | Education | 2020 |
| Let's Talk Autism Limited | Health & social care | 2018 |
| Let-It Estate Management Limited | Hospitality | 2009 |
| Letarian Property Ltd | Real estate | 2024 |
| Letlogic Software Ltd | Information & communication | 2026 |
| Lets Grow Consulting Ltd | Professional & scientific | 2023 |
| Letting for Less Ltd | Real estate | 2025 |
| Let’S Book IT Ltd | Administrative & support | 2023 |
| Levictus Property Investment Group Ltd | Administrative & support | 2025 |
| Leviticux Entertainment Group Limited | Hospitality | 2025 |
| Lewell Carpets Limited | Wholesale & retail | 2014 |
| Lewis (Investments) Limited | Construction | 1933 |
| Lewis Canmore Limited | Professional & scientific | 2016 |
| Lewis Irons Group Limited | Financial services | 2025 |
| Lewis Irons Property Limited | Real estate | 2025 |
| Lewis Irons Serviced Accomodation Limited | Hospitality | 2025 |
| Lewis Niven Ltd | Administrative & support | 2023 |
| Leymill Limited | Wholesale & retail | 1990 |
| LFK Services Limited | Wholesale & retail | 2021 |
| LG Brickwork Limited | Administrative & support | 2021 |
| LG Mann Ltd | Arts & recreation | 2026 |
| Lhtas Limited | Professional & scientific | 2018 |
| LI & NDP Limited | Education | 2023 |
| Lianex Limited | Health & social care | 2018 |
| Liberty Concept UK Limited | Extraterritorial | 2014 |
| Liberty Learning Consultancy Limited | Professional & scientific | 2015 |
| Libra Associates Limited | Real estate | 2004 |
| Libra Printing Ltd | Manufacturing | 2022 |
| LIBURD27 Ltd | Financial services | 2018 |
| Life Accountancy Ltd | Professional & scientific | 2025 |
| Life Motors Ltd | Wholesale & retail | 2023 |
| Life With a Difference CIC | Health & social care | 2025 |
| Lifestyle Care Support Limited | Health & social care | 2007 |
| Lifestyle Performance Transformations Limited | Arts & recreation | 2015 |
| Lifestyle Personal Training Limited | Arts & recreation | 2011 |
| Lifestyle Upholstery Limited | Wholesale & retail | 2020 |
| Lifesync Technologies Ltd | Information & communication | 2023 |
| Light Force Construction Limited | Construction | 1998 |
| Lignea Limited | Construction | 2025 |
| Lilianna and Gabriel Services Ltd | Wholesale & retail | 2025 |
| Lilly Court (Kettering) Management Limited | Households | 2004 |
| Lillygrace Ltd | Health & social care | 2019 |
| Lilu Transport Ltd | Transport & logistics | 2024 |
| Lilyherb Ltd | Health & social care | 2010 |
| Lilymayflower CIC | Other services | 2024 |
| Limb Therapy Limited | Other services | 2023 |
| Lime Tree Lettings & Sales Limited | Real estate | 2010 |
| Liminal OD Ltd | Professional & scientific | 2026 |
| Limitless Training Club Ltd | Arts & recreation | 2018 |
| Limperio Ltd | Manufacturing | 2016 |
| Linda Bailey Skin Body and Laser Ltd | Administrative & support | 2025 |
| Linden Brooke Limited | Households | 1995 |
| Linden Healthcare Holdings Ltd | Health & social care | 2025 |
| Lindsey Fabrication & Engineering Limited | Manufacturing | 2014 |
| Line Property Ltd | Wholesale & retail | 2021 |
| Linea Design Ltd | Manufacturing | 2015 |
| Linear Accountants Ltd | Professional & scientific | 2014 |
| Linear Consulting Ltd | Professional & scientific | 2018 |
| Linear Property Limited | Real estate | 2018 |
| Lingoroua Linguistic Centre Academy C.I.C. | Education | 2026 |
| Linnell Property Management Ltd | Real estate | 2020 |
| Lino Giordano Limited | Manufacturing | 2016 |
| Linton Foods Limited | Manufacturing | 1994 |
| Lion Cubs Football Ltd | Education | 2020 |
| Lion Tiling Ltd | Construction | 2021 |
| Liquid Intelligence Logistics Limited | Transport & logistics | 2025 |
| Lismore Close 1963 Limited | Extraterritorial | 2014 |
| Litehouzz Ltd | Health & social care | 2022 |
| Little Acorn Associates Ltd | Professional & scientific | 2018 |
| Little Box Logistics Limited | Transport & logistics | 2025 |
| Little Dish Holdings Limited | Financial services | 2017 |
| Little Fins Swim School Ltd | Education | 2024 |