| Ladbytams Ltd | Water & waste | 2025 |
| Ladybirds (1991) Investments Limited | Real estate | 2019 |
| Ladybirds CS Limited | Health & social care | 2026 |
| Lagom Build (Dormant) Limited | Construction | 2022 |
| Lagom Build Co Ltd | Construction | 2024 |
| Laimable Risk and Audit Consulting Limited | Other services | 2015 |
| Lakedale 14 Ltd | Wholesale & retail | 2022 |
| Lakedale Property Services Limited | Real estate | 2011 |
| Lakemere Properties Limited | Real estate | 2026 |
| Lakesidemarkets Ltd | Hospitality | 2023 |
| Laktera UK Limited | Wholesale & retail | 2024 |
| Lalak Ltd | Wholesale & retail | 2025 |
| Lale Cafe Limited | Hospitality | 2023 |
| Lamarose Finance Limited | Financial services | 1984 |
| Lambroloves Limited | Hospitality | 2018 |
| Lampton Court (Hounslow) RTM Company Limited | Real estate | 2024 |
| Lamuk Ltd | Hospitality | 2018 |
| LAN & NG Ltd | Information & communication | 2017 |
| Lanabra Limited | Health & social care | 2026 |
| Lancerange Limited | Real estate | 1995 |
| Land Matters Sourcing & Development Ltd | Real estate | 2015 |
| Land Plan Limited | Real estate | 2024 |
| Landcon Services Limited | | 1980 |
| Lander Developments Limited | Real estate | 1997 |
| Landlord Limited | Real estate | 1985 |
| Lando's Family Butcher Ltd | Wholesale & retail | 2012 |
| Landscaping Design Bromley Ltd | Administrative & support | 2025 |
| Lanesborough Court Management Company Limited | Households | 2007 |
| Langclearuk Ltd | Financial services | 2025 |
| Langham Close Management Company Limited | Real estate | 2009 |
| Lankton Close (Freehold) Limited | Households | 2004 |
| Lanniston London Limited | Construction | 2019 |
| Laosen Ltd | Other services | 2021 |
| LAP Developments Ltd | Real estate | 2016 |
| Laratex Limited | Other services | 1982 |
| Largehead Ltd | Professional & scientific | 2023 |
| Larimar Services Limited | Professional & scientific | 2015 |
| Larksons Ltd | Professional & scientific | 2025 |
| Larky Pictures Ltd | Information & communication | 2024 |
| Laroche Management Limited | Households | 1991 |
| Larry Bouk Ltd | Professional & scientific | 2020 |
| Laser Refurbishment & Construction Limited | Construction | 2010 |
| Laserlaneclinic Ltd | Other services | 2026 |
| Lash ME UP Ltd | Wholesale & retail | 2025 |
| Last Mile Recovery Ltd | Transport & logistics | 2025 |
| Last Stop Building Services Limited | Construction | 2015 |
| Latika Education Limited | Education | 2018 |
| Latinidad Ltd | Education | 2021 |
| Launchpad Recruits Ltd | Administrative & support | 2011 |
| Laundre Holdings Ltd | Manufacturing | 2020 |
| Lauraya Consulting Ltd | Information & communication | 2013 |
| Laurel Gardens Management Limited | Households | 2002 |
| Laurence Dutton Photography Limited | Information & communication | 2000 |
| Laurus Sports Ltd | Arts & recreation | 2017 |
| Laverstock Management COR Limited | Real estate | 2022 |
| Lavidaesforliving Ltd | Wholesale & retail | 2025 |
| Lawhn Limited | Hospitality | 2025 |
| Lawn and Order Gardens Ltd | Administrative & support | 2015 |
| Lawn Manor (Elstree) Management Company Limited | Households | 2020 |
| Laxmi Court Freehold Limited | Households | 2017 |
| Laxmi Court Management Company Limited | Extraterritorial | 2011 |
| Layead Ltd | Professional & scientific | 2012 |
| Layris Ltd | Other services | 2023 |
| Lazarto UK Ltd | Wholesale & retail | 2026 |
| Lazeez (Bromley) Ltd | Hospitality | 2014 |
| Lazeez Fusion Ltd | Hospitality | 2021 |
| Lazy Leopard Productions Limited | Professional & scientific | 2018 |
| LBL Advisory Limited | Information & communication | 2026 |
| LBU Limited | Extraterritorial | 2003 |
| Lcxl Limited | Health & social care | 2015 |
| LDF Design & Build Ltd | Construction | 2024 |
| LDG Maintenance Group Ltd | Construction | 2026 |
| LDL Electrical Ltd | Construction | 2025 |
| LDN 3X3 Ltd | Arts & recreation | 2024 |
| LDN Socials Ltd | Professional & scientific | 2024 |
| LDT Building Group Limited | Construction | 2025 |
| LE BOT Events Limited | Administrative & support | 2017 |
| LE Cauffour Consultants Limited | Administrative & support | 2016 |
| LE Chic Mother of the Bride Ltd | Wholesale & retail | 2018 |
| LE French Programme Ltd | Education | 2013 |
| LE Rocce Ltd | Extraterritorial | 2025 |
| LE Studio UK Limited | Wholesale & retail | 2006 |
| LEAD2COM Limited | Professional & scientific | 2024 |
| Leadenhall Learning Limited | Information & communication | 2014 |
| Leaderboard Business Network Ltd | Information & communication | 2023 |
| Leaders Mini Market Ltd | Wholesale & retail | 2024 |
| Leaders Property Ltd | Real estate | 2022 |
| Leading Advisory Private Limited | Professional & scientific | 2019 |
| Leading Builders Limited | Construction | 2016 |
| Leading Edge Leisure Consultants Limited | Arts & recreation | 2017 |
| Leading Edge Leisure Management Limited | Professional & scientific | 2019 |
| Leaning BOY Ltd | Extraterritorial | 2013 |
| Leantonio Designs Ltd | Professional & scientific | 2020 |
| Leap Micro AD Ltd | Professional & scientific | 2017 |
| Learn Wild Limited | Education | 2024 |
| Learning Approach Services Ltd | Education | 2025 |
| Learning Squares Limited | Education | 2018 |
| Leaseoptionstogether Ltd | Financial services | 2026 |
| Lebanese Grill 1 Ltd | Hospitality | 2025 |
| Ledger Lane Ltd | Administrative & support | 2026 |