| Lewis Peddle Lofts Limited | Construction | 2018 |
| Lewylan Associates Ltd | Health & social care | 2015 |
| Lexieworld Ltd | Wholesale & retail | 2015 |
| Leys Business Centre Limited | Real estate | 2005 |
| Leywood Properties Ltd | Real estate | 2021 |
| LF Surveys Limited | Administrative & support | 2015 |
| LG Builders and Renovations Ltd | Construction | 2023 |
| LG Walsh Homes Ltd | Construction | 2024 |
| LGS Consulting Ltd | Professional & scientific | 2026 |
| LH Property Co. Limited | Administrative & support | 1997 |
| Lhasa Town Limited | Information & communication | 2025 |
| Lhdc Limited | Health & social care | 2023 |
| LHE Property Ltd | Real estate | 2024 |
| Liberty Court RTM Company Ltd | Households | 2013 |
| Liberty Packaging Systems LLP | | 2011 |
| Libra Building Solutions Ltd | Construction | 2024 |
| Libre Property Ltd | Real estate | 2023 |
| Lidtech Security Solutions Ltd | Administrative & support | 2019 |
| Life++ CIC | Education | 2023 |
| LIFECARE09 Limited | Health & social care | 2009 |
| Lifeline Digitals Ltd | Information & communication | 2025 |
| Lifelong Properties Ltd | Real estate | 2020 |
| Lifestone Healthcare Ltd | Health & social care | 2023 |
| Lifeway Healthcare Limited | Health & social care | 2022 |
| Lift Guide Ltd | Professional & scientific | 2026 |
| Lifted International and Services Limited | Administrative & support | 2015 |
| Light Health Ltd | Health & social care | 2022 |
| Light Touch Marketing Limited | Professional & scientific | 2021 |
| Light Way Homes Limited | Real estate | 2026 |
| Lighter Ltd | Wholesale & retail | 2019 |
| Lightstone Health Limited | Health & social care | 2025 |
| Lilicleaning Limited | Administrative & support | 2026 |
| Lillbits Ltd | Hospitality | 2026 |
| Lily Baby Care Ltd | Health & social care | 2025 |
| Limbau Transport Limited | Transport & logistics | 2019 |
| Limsar Ltd | Real estate | 2020 |
| Lincoln House Developments Limited | Real estate | 2011 |
| Linden Plant Exports Limited | Administrative & support | 2005 |
| Lindhill (Andrews Lane) Management Ltd | Administrative & support | 2023 |
| Lindita Foods Ltd | Hospitality | 2026 |
| Line Touch Limited | Administrative & support | 2021 |
| Linex Engineering Ltd | Construction | 2025 |
| Linkside (Burton) Management Company Limited | Households | 2015 |
| Linxwich Limited | Wholesale & retail | 2016 |
| Lion EGG and Packagin Limited | Wholesale & retail | 2025 |
| Lioncrest Building Services Ltd | Construction | 2020 |
| Liroy UK Limited | Administrative & support | 2022 |
| Lisa Marie Laser and Aesthetics Ltd | Other services | 2019 |
| Lithena Ltd | Hospitality | 2024 |
| Little Bear Media Limited | Professional & scientific | 2023 |
| Little Brook Management Company Limited | Real estate | 1996 |
| Little Carpet & Flooring Company UK Limited | Wholesale & retail | 2019 |
| Little Contractor Limited | Construction | 2018 |
| Little Lattons Nursery Limited | Health & social care | 2021 |
| Little Lites Ltd | Construction | 2025 |
| Little Zaytouna Co Ltd | Wholesale & retail | 2026 |
| Live Law Ltd | Professional & scientific | 2024 |
| Live Switch Ltd | Information & communication | 2012 |
| Livelystones Limited | Health & social care | 2023 |
| Livingston Crescent Ltd | Real estate | 2024 |
| Liviu Dragnea Ltd | Transport & logistics | 2018 |
| Livmattresses Ltd | Manufacturing | 2025 |
| Livory Ltd | Health & social care | 2024 |
| LIZ Bush Art Ltd | Administrative & support | 2017 |
| LJ Logistical Solutions Ltd | Transport & logistics | 2018 |
| LJ Star Ltd | Real estate | 2012 |
| LJ Star Property Management Ltd | Real estate | 2021 |
| LJC Contour Holdings Limited | Financial services | 2024 |
| LJG Wealth Management Limited | Financial services | 2019 |
| LJR Conveyancing Limited | Administrative & support | 2023 |
| LJR Developments Ltd | Real estate | 2024 |
| LKM Utilities Ltd | Construction | 2025 |
| Llais Tawe Management Company Limited | Households | 2013 |
| Llcs Cleaning Ltd | Administrative & support | 2022 |
| Llema Ltd | Health & social care | 2018 |
| LLL Luxury London Letting Limited | Hospitality | 2018 |
| Lloyds Clinical Limited | Wholesale & retail | 1992 |
| LLS Investment Group Ltd | Real estate | 2026 |
| LM Accounts Limited | Professional & scientific | 2020 |
| LMA Speed Ltd | Transport & logistics | 2025 |
| Lmaspeedtransport Limited | Transport & logistics | 2024 |
| LMB Interiors Ltd | Construction | 2022 |
| LMB Lashes and Beauty Ltd | Other services | 2025 |
| LMG Motors Ltd | Wholesale & retail | 2022 |
| LMN Plumbing and Heating Ltd | Construction | 2024 |
| Lmsj Ltd | Administrative & support | 2011 |
| LN Engineering Services Ltd | Professional & scientific | 2024 |
| Lnrmall Limited | Health & social care | 2022 |
| LOA Consults Ltd | Administrative & support | 2024 |
| LOA Services Ltd | Professional & scientific | 2021 |
| Locah Health Limited | Health & social care | 2025 |
| Local Repairs Ltd | Other services | 2017 |
| Localstance Property Management Limited | Households | 1994 |
| Lochrin Electrics Limited | Construction | 2016 |
| Lock House Management Company Limited | Households | 1976 |
| Lock Stock Deacts Ltd | Wholesale & retail | 2024 |
| Lockhart Hawkins Limited | Education | 2015 |
| Lockharts RMC Limited | Households | 2019 |
| Locks LAB Cosmetics Ltd | Wholesale & retail | 2025 |
| Lockside (Southbridge) Management Company Limited | Households | 2015 |