| Lakeside Refurbs Limited | Wholesale & retail | 2020 |
| Lakshmi Shreem Limited | Real estate | 2022 |
| Lamdon Limited | Hospitality | 2024 |
| Lamp Group LLP | | 2023 |
| Lamptey Properties Limited | Real estate | 2022 |
| LAN Haoz Ltd | Real estate | 2023 |
| Lancelot Command Limited | Information & communication | 1993 |
| Lander (PLS) Limited | Professional & scientific | 2006 |
| Landlord Hive Ltd | Information & communication | 2023 |
| Landmark Commercial Finance Ltd | Financial services | 2024 |
| Landmark Ladhar Homes Ltd | Real estate | 2024 |
| Landmark Specialist Finance Limited | Financial services | 2021 |
| Landscape Masters Limited | Extraterritorial | 2025 |
| Lane Electrical Ltd | Construction | 2021 |
| Lanes Trailer Services Limited | Administrative & support | 2003 |
| Lanext Holding Limited | Financial services | 2023 |
| Lant Ltd | Manufacturing | 2014 |
| Laraib Ltd | Other services | 2018 |
| Larry's Bros Ltd | Construction | 2020 |
| Laser Skin Leicester Ltd | Other services | 2024 |
| Laser-Pic Ltd | Wholesale & retail | 2022 |
| Laulsfit Ltd | Other services | 2021 |
| Laureates Technologies Limited | Information & communication | 2025 |
| Lauressa Advisory Ltd | Real estate | 2015 |
| Law Dempster Security Ltd. | Administrative & support | 2000 |
| Lawtribe Limited | Information & communication | 2025 |
| Lazaroi Construction Ltd | Construction | 2024 |
| LB Project Services Limited | Construction | 2023 |
| LBC Improvements & Developments Ltd | Construction | 2023 |
| LBK Yummy Food Limited | Manufacturing | 2015 |
| LC Services (Kent) Limited | Construction | 2015 |
| LCC Consulting Limited | Professional & scientific | 2024 |
| Lcpg Property Limited | Construction | 2024 |
| LD Automotive Repairs Ltd | Wholesale & retail | 2024 |
| LDA Hardware Limited | Wholesale & retail | 2022 |
| LDK Trade Ltd | Wholesale & retail | 2019 |
| LDN Exec Ltd | Transport & logistics | 2019 |
| LDN Travel Ltd | Transport & logistics | 2024 |
| LDP Serv Ltd | Extraterritorial | 2014 |
| LE2D Limited | Other services | 2016 |
| Leading Pest Solutions Ltd | Administrative & support | 2024 |
| Leadmoon Ltd | Administrative & support | 2019 |
| Leahy Financial Solutions Ltd | Financial services | 2016 |
| Learoyds Holdings Limited | Financial services | 2023 |
| Learoyds Properties Limited | Real estate | 2020 |
| Leaseholders of 115/119 Goldhurst Terrace Ltd | Households | 2023 |
| Lech Partition Ltd | Professional & scientific | 2007 |
| LED Online Limited | Manufacturing | 2017 |
| Ledwith Consulting Ltd | Financial services | 2024 |
| LEE Haoz Ltd | Real estate | 2021 |
| Lee's Kitchens and Bedrooms Limited | Construction | 2015 |
| Leebee Homes Ltd | Real estate | 2021 |
| Leen Trading Ltd | Manufacturing | 2020 |
| Legacy Concept Limited | Administrative & support | 2022 |
| Legacy Education Tool Ltd. | Education | 2018 |
| Legacy Loans Ltd | Financial services | 2022 |
| Legacy Matters (London) Ltd | Financial services | 2025 |
| Legal Assurance Network Limited | Professional & scientific | 2026 |
| Legal LEX Limited | Professional & scientific | 2026 |
| Legalaid Network LLP | | 2025 |
| Legend Services UK Ltd | Transport & logistics | 2022 |
| Leigh Fitness Centre Limited | Arts & recreation | 2012 |
| Leigh Properties London Ltd | Real estate | 2021 |
| Lela Decorators Ltd | Construction | 2014 |
| Lemon Hospitality Ltd | Hospitality | 2025 |
| Lenka Limited | Real estate | 2021 |
| Lenkas Transort Limited | Transport & logistics | 2025 |
| LEO Joinery LLP | | 2015 |
| LEO Property Improvements Limited | Construction | 2023 |
| Leo's Cafe Limited | Hospitality | 2025 |
| Leon FLY Limited | Administrative & support | 2020 |
| Leon Guarding Services Limited | Real estate | 2019 |
| Leon Swierczewski Property Limited | Real estate | 2016 |
| Leonidas Investments Ltd | Real estate | 2025 |
| Leopoldo Corsalini Limited | Extraterritorial | 2022 |
| Leore Properties Limited | Real estate | 2018 |
| Leos Consultancy Limited | Education | 2022 |
| Lerouman Ltd | Health & social care | 2026 |
| Lets Party Fireworks Ltd | Wholesale & retail | 2018 |
| Lets Smile Limited | Health & social care | 2012 |
| Level Best Financial Solutions Limited | Financial services | 2024 |
| Level UP Marketing Ltd | Professional & scientific | 2026 |
| LEW Property Inventories Limited | Households | 2023 |
| Lewis Tullett Consultants Limited | Real estate | 2013 |
| LFS UK Limited | Manufacturing | 1994 |
| LHI Holdings Limited | Other services | 2018 |
| Lick Library.Com Limited | Information & communication | 2002 |
| Lida Projects Ltd | Construction | 2026 |
| Life Planning Logistics Limited | Professional & scientific | 2015 |
| Life Tree Properties 1 Limited | Real estate | 2021 |
| Life Tree Properties Limited | Real estate | 2020 |
| Life-Ot Ltd. | Professional & scientific | 2020 |
| Lifeshield Care Ltd | Health & social care | 2023 |
| Lifestyle and Leisure Group Ltd | Construction | 2023 |
| Lifestyle Combo Ltd | Professional & scientific | 2025 |
| Lifestyle Developments UK Limited | Construction | 2004 |
| Lifestyle Window Centres Limited | | 1983 |
| Lift Access Services Ltd | Professional & scientific | 2022 |
| Lift and Escalator Recruitment Limited | Professional & scientific | 2018 |
| Liftonomy Ltd | Professional & scientific | 2026 |