| Landlordcertificatechecks Ltd | Other services | 2024 |
| Landscape Logistics Ltd | Construction | 2016 |
| Lane 25 Group Ltd | Construction | 2026 |
| Lanesra Ltd | Hospitality | 2026 |
| Lanfo Limited | Construction | 2023 |
| Langaka Limited | Wholesale & retail | 2022 |
| Langham and Langley Limited | Professional & scientific | 2023 |
| Langshore Merchants Ltd | Manufacturing | 2025 |
| LAP Construction Solutions Ltd | Construction | 2024 |
| Lara Rehab & Wellness Ltd | Health & social care | 2026 |
| Laresco Limited | Professional & scientific | 2024 |
| Larex Ventures Limited | Hospitality | 2019 |
| Largistix Ltd | Transport & logistics | 2018 |
| Larisamedical Ltd | Health & social care | 2021 |
| Larmel Group Ltd | Construction | 2026 |
| Larossy Limited | Health & social care | 2014 |
| Larush Services Limited | Wholesale & retail | 2020 |
| Laryea Innovations Ltd | Wholesale & retail | 2025 |
| Laser Light Skin Clinic Ltd | Other services | 2019 |
| Laser of Beauty Limited | Other services | 2015 |
| Lasmas Consulting Ltd | Construction | 2018 |
| Lassana Services Limited | Construction | 2025 |
| Late for Breakfast Limited | Real estate | 2024 |
| Latlab Limited | Information & communication | 2023 |
| Latter Day Glory Publishers Limited | Wholesale & retail | 2020 |
| Latter Glory Ministries Ltd | Other services | 2018 |
| Latterbros UK Limited | Administrative & support | 2020 |
| Laurence & Daughter Ltd | Other services | 2024 |
| Lavanta Design Ltd | Manufacturing | 2024 |
| Lavass Ltd | Construction | 2017 |
| Lavender & Co UK Limited | Other services | 2024 |
| Lavont Ltd | Wholesale & retail | 2019 |
| Law Solutions Limited | Professional & scientific | 2024 |
| Lawaai Productions Ltd | Arts & recreation | 2019 |
| Lawans Cars Limited | Wholesale & retail | 2025 |
| Lawans Consulting Limited | Transport & logistics | 2017 |
| Lawindgallery Ltd | Wholesale & retail | 2025 |
| Lawrence and Wishart Limited | Information & communication | 1936 |
| Lawrencia Care Ltd | Health & social care | 2024 |
| Lawson Noruwa Ltd | Transport & logistics | 2025 |
| LAY Pharm Limited | Wholesale & retail | 2017 |
| Layo Care Ltd | Health & social care | 2019 |
| Layota Healthcare Ltd | Health & social care | 2022 |
| Lazar Cargo Ltd | Transport & logistics | 2019 |
| Lazar FIX 1 Limited | Construction | 2025 |
| Lazar FIX Ltd | Construction | 2012 |
| Lazarus Transport Ltd | Transport & logistics | 2020 |
| Lazpresso Cafe Ltd | Hospitality | 2024 |
| Lazzat Point Ltd | Wholesale & retail | 2024 |
| LB Group London Ltd | Construction | 2026 |
| Lbarchigroup Ltd | Construction | 2017 |
| LBK Hair Studio Ltd | Other services | 2023 |
| LBK Transport Ltd | Transport & logistics | 2026 |
| LBS Assets Ltd | Financial services | 2019 |
| LBS Projects Ltd | Financial services | 2026 |
| LBS Security Services Limited | Manufacturing | 1998 |
| LCC Estates Ltd | Real estate | 2019 |
| LCH Housekeeping Limited | Administrative & support | 2023 |
| LCO Educational Psychology Ltd | Education | 2021 |
| LD Invest Ltd | Real estate | 2021 |
| LDC Roofing Ltd | Construction | 2019 |
| LE Patron Collection Limited | Wholesale & retail | 2024 |
| LEA Romea Limited | Other services | 2008 |
| Lead Construction Group Ltd | Construction | 2022 |
| Leaders Contracting Limited | Financial services | 2017 |
| Leag Consult Ltd | Information & communication | 2025 |
| LEARN2D Driving School Limited | Wholesale & retail | 2024 |
| Learning Hive - Becontree Ltd | Education | 2024 |
| Leather Merchants Ltd | Wholesale & retail | 2020 |
| Leather Pouch Ltd | Manufacturing | 2011 |
| LEE Build Services Ltd | Construction | 2021 |
| LEE Consult Ltd | Health & social care | 2021 |
| LEE Digital House and Creative Arts Limited | Information & communication | 2025 |
| Leer Factory Ltd | Manufacturing | 2025 |
| Legacy Security Limited | Administrative & support | 2012 |
| LEI Construction Ltd | Construction | 2025 |
| Leisure Hoppers.Co.Uk Limited | Administrative & support | 2018 |
| Lekab Company Limited | Professional & scientific | 2011 |
| Lekson Brothers Limited | Wholesale & retail | 2012 |
| Lensbergas Consulting Ltd | Information & communication | 2025 |
| LEO and SON Plumbing and Property Management Ltd | Construction | 2022 |
| LEO FOX Ltd | Real estate | 2020 |
| LEO Jamina Limited | Real estate | 2023 |
| Leocrys Care Limited | Health & social care | 2019 |
| Leone Shops Ltd | Wholesale & retail | 2025 |
| Leontech Ltd | Other services | 2024 |
| Lepaj Integrated Consultants Ltd | Professional & scientific | 2010 |
| Lesman BP Limited | Construction | 2019 |
| Lestine Health Care Services Limited | Health & social care | 2020 |
| LET N Move UK Ltd | Construction | 2012 |
| LET Them Talk: Empowering Youth Dialogue Ltd | Education | 2025 |
| Lets Check in Check OUT Limited | Real estate | 2025 |
| Levaccounts Ltd | Professional & scientific | 2017 |
| Levski Construction Ltd | Construction | 2024 |
| Levystart Ltd | Construction | 2017 |
| Lewis & Leon Transport Ltd | Administrative & support | 2017 |
| Lewis Janitorial Services Limited | Administrative & support | 2025 |
| Lexash Services Limited | Health & social care | 2019 |
| Lexitas Legal Ltd | Professional & scientific | 2025 |
| Lexoid Company Limited | Wholesale & retail | 2020 |