| Laverty Industries Ltd | Professional & scientific | 2020 |
| Lawford Solar Ltd | Energy | 2022 |
| Lawnfield and Pine Court Freehold Limited | Other services | 2012 |
| Lawnhurst Residents Association Limited | Households | 2010 |
| Lawrence Wang Ltd | Wholesale & retail | 2011 |
| Lawyer on Demand Limited | Professional & scientific | 2017 |
| Layer 1 Legal Limited | Professional & scientific | 2017 |
| Laziz House Ltd | Hospitality | 2022 |
| LB Floor Solutions Ltd | Construction | 2025 |
| LBA Europe Ltd | Financial services | 2023 |
| LBA Industrial Management Europe LLP | | 2023 |
| LBA NC Core Industrial UK Company I Ltd | Financial services | 2024 |
| LBA NC Core Industrial UK Company II Ltd | Financial services | 2026 |
| LBA NC Core Industrial UK Company III Ltd | Financial services | 2026 |
| Lbyb Ngangjoh Ltd | Real estate | 2023 |
| LC Commercial Consulting UK Limited | Professional & scientific | 2025 |
| LC Controls Software Group Limited | Professional & scientific | 2025 |
| LC Excellence London Ltd | Education | 2022 |
| Lcas Digital Limited | Administrative & support | 2026 |
| LCC Clothing UK Limited | Extraterritorial | 2011 |
| LCL Bidco 7 Limited | Financial services | 2025 |
| LCO Enterprises Ltd | Manufacturing | 2012 |
| LDA EYE Clinic Limited | Health & social care | 2019 |
| LDC Property Hub Limited | Real estate | 2022 |
| LDK Electrical & Security Services Limited | Construction | 2017 |
| LDM Data Analyst & Quality Services Limited | Administrative & support | 2012 |
| LDM Developments Ltd | Construction | 2019 |
| LDR Consulting Ltd | Information & communication | 2025 |
| LE Bronzage Ltd | Other services | 2022 |
| LE Mans Esports Series Limited | Information & communication | 2019 |
| Leach's of Shudehill Limited | Transport & logistics | 1965 |
| Leaders of Future CIC | Education | 2026 |
| Leaders of OUR Future Ltd | Education | 2025 |
| Leal Sports Group Ltd | Arts & recreation | 2025 |
| Lean Kitchen Limited | Information & communication | 2022 |
| Lean Strategic Ltd | Information & communication | 2013 |
| Leanne Ryan Limited | Financial services | 2025 |
| Learn & Change Ltd | Information & communication | 2022 |
| Learn North West Education LLP | | 2020 |
| Learning Executive Network Ltd | Public administration | 2025 |
| Leasecompare Ltd | Other services | 2022 |
| Leatherhead Office Park Management Company Limited | Real estate | 2004 |
| Lecitein Limited | Manufacturing | 2021 |
| Leclardo Consulting Limited | Professional & scientific | 2019 |
| Leclardo Developments Limited | Real estate | 2019 |
| LEE Broadcast Limited | Information & communication | 2014 |
| LEE Oxley Consultancy Ltd | Professional & scientific | 2023 |
| Leeds International Festivals and Events (Life) Limited | Arts & recreation | 2023 |
| Leensde International UK Ltd | Wholesale & retail | 2021 |
| Leeson Chemicals Limited | Manufacturing | 2002 |
| Leeson Polyurethanes Limited | Manufacturing | 1986 |
| Legacy Locker Limited | Information & communication | 2025 |
| Legacy Oak Group Limited | Information & communication | 2026 |
| Legacy Property Holdings Ltd | Real estate | 2018 |
| Legacy Property Holdings Management Ltd | Real estate | 2017 |
| Legacy Vantage Commercial Services Ltd | Professional & scientific | 2023 |
| Legal JOB Coach.Com Limited | Extraterritorial | 2020 |
| Legal Mind Matters Limited | Other services | 2025 |
| Legendary Mobile Tyre Service Ltd | Wholesale & retail | 2026 |
| Legh Court Management Company Limited | Households | 2002 |
| Leicester Road Management (Hale) Limited | Households | 1986 |
| Leicester Road Management Company Limited | Households | 1984 |
| Leigh Electrical & Design Ltd | Construction | 2015 |
| Leighton Snow Independent Estate Agents Ltd | Real estate | 2018 |
| Leithan Consulting Ltd | Information & communication | 2025 |
| Lektromarin Limited | Other services | 2016 |
| Lela Company Holdings Limited | Financial services | 2024 |
| Lemon Locations Limited | Information & communication | 2022 |
| Lemontree Leadership Consultancy Limited | Professional & scientific | 2018 |
| Lemontree Property Ltd | Real estate | 2019 |
| Lemony Twelve Limited | Administrative & support | 2024 |
| Lendtech Group Ltd | Information & communication | 2017 |
| Lendtech Ltd | Information & communication | 2017 |
| Lengroy Services Limited | Professional & scientific | 2024 |
| Lenny M Limited | Professional & scientific | 2025 |
| Lentoradropshipping Limited | Wholesale & retail | 2025 |
| Lepps,Limited | Wholesale & retail | 1935 |
| LES Bergers Limited | Real estate | 2019 |
| Lestech Solutions Limited | Administrative & support | 2016 |
| LET US Survey Limited | Professional & scientific | 2019 |
| Letmore Group Ltd | Professional & scientific | 1999 |
| Letmore Lettings Ltd | Professional & scientific | 2006 |
| Letren Limited | Households | 1981 |
| Letting Central Limited | Information & communication | 2026 |
| Letural Premium Property Management Limited | Real estate | 2025 |
| Leung Medical Ltd | Health & social care | 2022 |
| LEV Cafe Ltd | Hospitality | 2026 |
| Level UP Team Training Ltd | Extraterritorial | 2024 |
| Levell & Co Limited | Professional & scientific | 2000 |
| Leven Group Limited | Wholesale & retail | 2018 |
| Levertech Property Services Limited | Construction | 2017 |
| Levitex Foams Ltd | Wholesale & retail | 2016 |
| Levitex Retail Ltd | Wholesale & retail | 2025 |
| Lewtas & Mooney Associates Limited | Financial services | 2003 |
| Lexi Solutions Limited | Professional & scientific | 2018 |
| Lexo Foods Ltd | Hospitality | 2025 |
| Lexy Consulting Limited | Professional & scientific | 2020 |
| LEY HEY Court Limited | Households | 1976 |
| LFO Properties UK Limited | Real estate | 2026 |
| LFX Consulting Limited | Professional & scientific | 2023 |