| Larch Health Care Ltd | Public administration | 2020 |
| Larchwood Accountants Limited | Professional & scientific | 2020 |
| Larcus Ltd | Wholesale & retail | 2022 |
| Larfz Limited | Administrative & support | 2017 |
| Larmandras Ltd | Administrative & support | 2022 |
| Larosa Properties Ltd | Real estate | 2025 |
| Lasagna HUT Limited | Hospitality | 2025 |
| Lashedbyg Ltd | Other services | 2024 |
| Lashes by Steph Ltd | Other services | 2024 |
| Lashlash London Ltd | Wholesale & retail | 2019 |
| Lashnique Limited | Other services | 2020 |
| Last Rope Limited | Wholesale & retail | 2018 |
| Last Wish Wills & Estate Planning Limited | Professional & scientific | 2025 |
| Latch&Key Properties Ltd | Real estate | 2026 |
| Latif Ltd | Information & communication | 2025 |
| Latisons Limited | Wholesale & retail | 1990 |
| Latitude Wealth Management Ltd | Financial services | 2018 |
| Laundrette.R Ltd | Administrative & support | 2026 |
| Laundry Blues Limited | Real estate | 1994 |
| Laurentiu Boancas Limited | Administrative & support | 2019 |
| Laval Ltd | Professional & scientific | 2020 |
| Lavan Properties Ltd | Real estate | 2025 |
| Lavan UK Ltd | Real estate | 2022 |
| Lavender Foot Healthcare Limited | Health & social care | 2022 |
| Lavender's Looms Ltd | Wholesale & retail | 2016 |
| Lavenderlane International Limited | Information & communication | 2024 |
| Lavika Enterprise Ltd | Wholesale & retail | 2022 |
| Lavinias Beautique Ltd | Other services | 2020 |
| Lavintechsolutions Ltd | Information & communication | 2025 |
| Lavish Respite Ltd | Hospitality | 2025 |
| Law Modular Limited | Real estate | 2019 |
| Law Property Developments Limited | Real estate | 2018 |
| Lawley Estates Ltd | Real estate | 2019 |
| Lawley Properties Ltd | Real estate | 2010 |
| Lawrence Solutions Ltd | Transport & logistics | 2025 |
| Lawrence Warden Properties Ltd | Real estate | 2020 |
| Lawy Ltd | Wholesale & retail | 2023 |
| Lawyer to Lifestyle Ltd | Administrative & support | 2022 |
| Layalpur Traders Ltd | Wholesale & retail | 2025 |
| Laydidees Natural Skincare Limited | Wholesale & retail | 2021 |
| Lazar Corporation Limited | Professional & scientific | 2025 |
| Lazy Frog (UK) Limited | Administrative & support | 2014 |
| LB & LC Ltd | Health & social care | 2018 |
| LB Brothers Transport Ltd | Transport & logistics | 2025 |
| LBA Homes Ltd | Hospitality | 2025 |
| LBA174 Studios Limited | Manufacturing | 2026 |
| LBL Home & Garden Maintenance Ltd | Real estate | 2023 |
| LC 988 Limited | Hospitality | 2026 |
| LCB Signature Escapes Ltd | Administrative & support | 2026 |
| LCC Springs Ltd | Manufacturing | 2023 |
| Lccm Ltd | Construction | 2023 |
| LCG Investments Limited | Real estate | 2024 |
| LCG Property Maintenance Ltd | Real estate | 2022 |
| LCK Healthcare Ltd | Health & social care | 2021 |
| LCM Law Limited | Administrative & support | 2011 |
| Lctss Ltd | Education | 2021 |
| LD & KK Ltd | Real estate | 2024 |
| LD Pastoral Services Ltd | Other services | 2012 |
| LD Solutions Ltd | Other services | 2018 |
| Ldrx Transport Ltd | Transport & logistics | 2026 |
| LE & Sons Logistic Ltd | Transport & logistics | 2018 |
| LE Caprice Ltd | Hospitality | 2023 |
| LE Codfather 1 Ltd | Hospitality | 2023 |
| LE Petit Salon Ltd. | Other services | 2013 |
| LE67 Consulting Limited | Professional & scientific | 2025 |
| LEA Francis Cars Limited | Wholesale & retail | 1977 |
| LEA Manor Gardens Management Ltd | Households | 2019 |
| LEA Manor Homes Limited | Construction | 2017 |
| LEA Manor Hotel (Albrighton) Limited | Hospitality | 1998 |
| LEA Manor IT Ltd | Information & communication | 2015 |
| Leabrook House Limited | Health & social care | 1994 |
| Lead With Impact CIC | Professional & scientific | 2026 |
| Leadership Alignment Ltd | Administrative & support | 2011 |
| Leading Edge Technical Services Ltd | Professional & scientific | 2023 |
| Leading Enterprises PK Limited | Wholesale & retail | 2024 |
| Leading Futures Education Services Ltd | Education | 2025 |
| Leading Ideas Limited | Education | 2007 |
| Leading Inclusion CIC | Education | 2026 |
| Leading Initiatives Ltd | Professional & scientific | 2012 |
| Leaf Relief Ltd | Wholesale & retail | 2020 |
| Leafluxe Ltd | Manufacturing | 2025 |
| Leahy Contracting Limited | Construction | 2004 |
| Lean Design Ltd | Administrative & support | 2022 |
| Leann Hearne Consulting Limited | Professional & scientific | 2025 |
| Leanne Causer Ltd | Hospitality | 2024 |
| Leaper Holdings Limited | Real estate | 2021 |
| Learn SEO Club Ltd | Wholesale & retail | 2024 |
| Learnbyte Limited | Education | 2025 |
| Learnexus Ltd | Education | 2025 |
| Learning Materials Limited | Education | 1973 |
| Learniture Ltd | Professional & scientific | 2017 |
| Learnscape Solutions Ltd | Education | 2025 |
| Lease Finance Limited | Administrative & support | 1989 |
| Leaselife Limited | Administrative & support | 2018 |
| Leason Accountancy Services Ltd | Professional & scientific | 2021 |
| Leatherific Ltd | Wholesale & retail | 2022 |
| Leatherstar Ltd | Wholesale & retail | 2026 |
| Leavier Ltd | Construction | 2018 |
| Lebeauty Aesthetics Ltd | Other services | 2023 |
| Lebourne Infotech Ltd | Information & communication | 2024 |