| Laundryworks Limited | Other services | 2021 |
| Laur Installations Ltd | Construction | 2015 |
| Laurels Global Limited | Extraterritorial | 2013 |
| Laurence Hotels Ltd | Hospitality | 2015 |
| Laurus Trading Ltd | Wholesale & retail | 2010 |
| Lavadent Limited | Manufacturing | 2011 |
| Lavanyaa Trading Ltd | Other services | 2016 |
| Lavash Bakery Ltd | Manufacturing | 2019 |
| Lawnsway Facial Surgery Ltd | Health & social care | 2017 |
| Lawpad Limited | Public administration | 2025 |
| Layalid Jewellery Limited | Wholesale & retail | 2024 |
| Layden Limited | Administrative & support | 2008 |
| Layla Boutique UK Ltd | Real estate | 2020 |
| Lazaar Facility Management Ltd | Real estate | 2018 |
| Lazm Essentialz Ltd | Wholesale & retail | 2024 |
| Lazy Llama Ltd | Wholesale & retail | 2015 |
| LBC Decorator Ltd | Construction | 2018 |
| LBC Express Limited | Transport & logistics | 2009 |
| LC 2 Estates Ltd | Real estate | 2022 |
| LCG London Ltd | Construction | 2020 |
| LCI Counselling and Wellbeing Ltd | Information & communication | 2025 |
| LDC Hub Ltd | Real estate | 2023 |
| LDG (London) Limited | Real estate | 2021 |
| LDS Investments Ltd | Real estate | 2019 |
| LDS Ventures Limited | Financial services | 2025 |
| LE GRA Beer Ltd | Manufacturing | 2023 |
| LE Soon Trading Co Ltd | Wholesale & retail | 2024 |
| LEA Motors 2023 Limited | Wholesale & retail | 2023 |
| Leacall Contractors Limited | Administrative & support | 2016 |
| Leaders 300 Limited | Other services | 2025 |
| Leanifyai Ltd | Information & communication | 2025 |
| Learning Access Limited | Education | 2022 |
| Learning Stars Limited | Education | 2015 |
| Learning-To-Learn CIC | Education | 2024 |
| Learntech Innovations Limited | Information & communication | 2024 |
| Leasewell Ltd | Administrative & support | 2025 |
| Lecsea Limited | Real estate | 2011 |
| LED by Wolves Ltd | Information & communication | 2020 |
| LED Investments Limited | Real estate | 2021 |
| LED Trading Limited | Health & social care | 2021 |
| Ledgerrise Ltd | Wholesale & retail | 2025 |
| Ledgerslabs.Ai Limited | Information & communication | 2025 |
| LEE Motors Services Ltd | Wholesale & retail | 2008 |
| LEE Sun City Limited | Hospitality | 2020 |
| Lee's Express Accounting Services Limited | Professional & scientific | 2025 |
| Leesafiona Ltd | Construction | 2019 |
| Leethu Ltd | Wholesale & retail | 2019 |
| Leeway International Trading Limited | Wholesale & retail | 2018 |
| Legacy Motors Group Ltd | Wholesale & retail | 2025 |
| Legacy Property Trading Ltd | Real estate | 2019 |
| Legital UK Ltd | Information & communication | 2022 |
| Leicester Motorcycle Centre Limited | Wholesale & retail | 2025 |
| Leigh Pharmacy Limited | Wholesale & retail | 2005 |
| Leighton House Practice Limited | Health & social care | 2007 |
| Leli Ltd | Construction | 2024 |
| LEN Shires Motors Limited | Wholesale & retail | 2010 |
| Lena's Day Care Ltd | Health & social care | 2012 |
| Lenahdajor Ltd | Professional & scientific | 2025 |
| Lenasri Ltd | Wholesale & retail | 2018 |
| LEO Advisory Limited | Professional & scientific | 2013 |
| Leobok Services Ltd | Professional & scientific | 2023 |
| Leon Heart Properties Ltd | Real estate | 2019 |
| Leonarch Limited | Professional & scientific | 2023 |
| Leonardliscamoving Limited | Transport & logistics | 2025 |
| Leopards 5 @Company Limited | Wholesale & retail | 2024 |
| Lept Ltd | Construction | 2018 |
| LES Sapeurs Ltd | Wholesale & retail | 2021 |
| Less for People Limited | Wholesale & retail | 2019 |
| LET IT BE Clean Ltd | Administrative & support | 2020 |
| LET Ltd | Real estate | 2007 |
| LET Your Rooms Ltd | Real estate | 2019 |
| Let's Go Food and Wine Ltd | Wholesale & retail | 2018 |
| Letting Serviced Apartments Limited | Hospitality | 2023 |
| Lettoi Co., Ltd. | Manufacturing | 2021 |
| Let’S Talk Knotless Limited | Other services | 2023 |
| Lewis Property Partnership LLP | | 2020 |
| Lexaline Ltd | Wholesale & retail | 2012 |
| Lexcom Management Services Ltd | Construction | 1998 |
| Lexi Learn Ltd | Administrative & support | 2007 |
| Lexie Dodd Limited | Arts & recreation | 2012 |
| Leyan Limited | Wholesale & retail | 2025 |
| LFC Drylining Ltd | Construction | 2021 |
| LGA Digital Services Limited | Information & communication | 2015 |
| LGR Driving School Ltd | Education | 2021 |
| LGS Motors Ltd | Wholesale & retail | 2014 |
| LHO Designs Limited | Professional & scientific | 2024 |
| LHS Property Limited | Real estate | 2016 |
| LHX Trading Ltd | Wholesale & retail | 2021 |
| Lhyhy Limited | Wholesale & retail | 2025 |
| Libero Card Limited | Financial services | 2013 |
| Liberty (UK) Limited | Wholesale & retail | 2014 |
| Liberty 8 Limited | Real estate | 2016 |
| Liberty Capital Limited | Financial services | 2021 |
| Liberty Workspace Limited | Real estate | 2019 |
| Liberty Workspace Wembley Ltd | Real estate | 2021 |
| Libraria Crestina Ltd | Wholesale & retail | 2023 |
| Liburn Method Ltd | Arts & recreation | 2021 |
| Life Baghdad for Food Supplements Ltd | Hospitality | 2024 |
| Life Centred Care Ltd | Real estate | 2023 |
| Life Supported Living Ltd | Health & social care | 2026 |