| LFP Services Ltd | Transport & logistics | 2024 |
| LG Autos MOT and Repair Centre Limited | Wholesale & retail | 2024 |
| LG Wellness Group Ltd | Administrative & support | 2024 |
| LGA Properties Limited | Real estate | 2023 |
| LH Mortgage Consultancy Ltd | Financial services | 2017 |
| Lhaminar FLO Limited | Real estate | 2021 |
| LHC Associates Ltd | Professional & scientific | 2025 |
| LHD Car Sales Ltd | Wholesale & retail | 2019 |
| LHL Electrical Solutions Limited | Construction | 2025 |
| Libby-Mae Limited | Administrative & support | 2025 |
| Life Aligned Accounting Limited | Extraterritorial | 2014 |
| Life Pulse Care Limited | Health & social care | 2025 |
| Lifeskills (Yorkshire) Ltd | Health & social care | 2024 |
| Light Commercial Vehicles (Mexborough) Limited | Wholesale & retail | 1983 |
| Light Financial Services Ltd | Professional & scientific | 2018 |
| Lighthouse Homes | Hospitality | 2002 |
| Lightning Box Limited | Arts & recreation | 2015 |
| Like a Rocket Limited | Real estate | 2022 |
| Lilah Glasgow Ltd | Real estate | 2026 |
| Lilcharva Ltd | Information & communication | 2025 |
| Lili H Ltd | Administrative & support | 2021 |
| Lilia Bistro Ltd | Hospitality | 2024 |
| Lilians Lettings Limited | Real estate | 2026 |
| LILIES24 Healthcare Ltd | Health & social care | 2011 |
| Lilleker Bros. Ltd. | Construction | 1993 |
| Lilleker Engineering Co. Limited | Manufacturing | 1983 |
| Lilley & Co Estates Ltd | Real estate | 2025 |
| Lillies Coffee Shop Ltd | Hospitality | 2018 |
| Lillistone Public House Ltd | Hospitality | 2025 |
| Lilly D Investments Limited | Real estate | 2026 |
| Lily D Limited | Professional & scientific | 2025 |
| Lilybee Ltd | Health & social care | 2021 |
| Lilykates Ltd | Hospitality | 2021 |
| Lilyrose Holdings Ltd | Wholesale & retail | 2023 |
| Lime Tree Day Nursery (Rotherham) Ltd | Education | 2016 |
| Limelight E-Commerce Limited | Wholesale & retail | 2022 |
| Limelight Mindcare Services Ltd | Health & social care | 2025 |
| Limer & Greene Ltd | Construction | 2021 |
| Limetree Wealth Management Limited | Professional & scientific | 2015 |
| Limitless PCS Limited | Other services | 2017 |
| Limitless Physiques Ltd | Education | 2022 |
| Lincarr Joinery & Building Limited | Construction | 2012 |
| Lincoln Ralph Limited | Real estate | 2020 |
| Linda Stringer Individual Estate Agency Ltd | Real estate | 2020 |
| Linda's Bake House Limited | Hospitality | 2022 |
| Linden Environmental Consultancy Ltd | Water & waste | 2023 |
| Linderson Europe Ltd | Health & social care | 2017 |
| Lindley Lettings Ltd | Real estate | 2024 |
| Lindum Terrace Residents Association Limited | Households | 1999 |
| Linear Plastering Services Ltd | Construction | 2021 |
| Linguist Training Limited | Administrative & support | 2016 |
| Linoshan Ltd | Wholesale & retail | 2018 |
| Linskey Consulting Ltd | Professional & scientific | 2026 |
| Linston Limited | Manufacturing | 1968 |
| Lion CI Ltd | Wholesale & retail | 2026 |
| LIS Trading Limited | Financial services | 2010 |
| Lisa Preston Ltd | Wholesale & retail | 2017 |
| Lisden Groundworks Limited | Construction | 2023 |
| Lissom Footwear Limited | Wholesale & retail | 2020 |
| LISTER4SHOPI Ltd | Wholesale & retail | 2025 |
| Little Arches Ltd | Health & social care | 2013 |
| Little Explorers Community Nursery Ltd | Education | 2023 |
| Little Gems & Trinkets Ltd | Wholesale & retail | 2025 |
| Little House Stays Limited | Hospitality | 2025 |
| Little Matlock Hamlet Management Limited | Real estate | 2001 |
| Little Minds Day Nursery Limited | Health & social care | 2021 |
| Little MO Ltd | Wholesale & retail | 2023 |
| Little MO Properties Ltd | Real estate | 2025 |
| Little Olives Nursery Ltd | Education | 2023 |
| Little Property Developments Limited | Real estate | 2019 |
| Little RIO Café Ltd | Hospitality | 2026 |
| Little Wonderers Ltd | Health & social care | 2025 |
| Littlewood Property Services Ltd | Real estate | 2024 |
| Liujoe Limited | Transport & logistics | 2019 |
| LIV Needham Ltd | Wholesale & retail | 2026 |
| Livabbies Limited | Financial services | 2026 |
| Live & Learn Sports Limited | Arts & recreation | 2012 |
| Live for the Moment Limited | Information & communication | 2026 |
| Live Lane Traffic Management Limited | Transport & logistics | 2022 |
| Live Well Consultancy and Coaching Limited | Other services | 2020 |
| Livermore Care Company Limited | Administrative & support | 2026 |
| Liversidge PUB Company Ltd | Administrative & support | 2024 |
| LIZ Goodbrand Ltd | Professional & scientific | 2025 |
| LJ Garden Services Ltd | Administrative & support | 2026 |
| LJB Family Estates Ltd | Real estate | 2025 |
| LJC Bathrooms Limited | Administrative & support | 2026 |
| LJG Homes Ltd | Real estate | 2025 |
| LJG Plumbing and Heating Limited | Construction | 2017 |
| LJL Investments Ltd | Real estate | 2018 |
| LJM Builders Limited | Construction | 2026 |
| LJS Civil Engineering Ltd | Construction | 2023 |
| LJS Talent Ltd | Professional & scientific | 2025 |
| LJT Motors Limited | Extraterritorial | 1988 |
| Lkhe Legacy Limited | Hospitality | 2023 |
| LKJ Developments Limited | Construction | 2021 |
| LKL Joinery Ltd | Construction | 2020 |
| LKN Properties Limited | Real estate | 2020 |
| Lloyd Access Ltd | Administrative & support | 2008 |
| Lloyd Thomas Consultancy Limited | Professional & scientific | 2000 |
| Lluxuryroma Ltd | Manufacturing | 2024 |