| London Elite Rental Management Ltd | Hospitality | 2023 |
| London Food Delivery Ltd | Wholesale & retail | 2020 |
| London Grocery Online Ltd | Wholesale & retail | 2020 |
| London Laser & Beauty Ltd | Wholesale & retail | 2025 |
| London Money (Financial Services) Ltd | Financial services | 2010 |
| London Money Ltd | Financial services | 2010 |
| London Primary Care Partners Ltd | Health & social care | 2026 |
| London Properties Group Limited | Real estate | 2021 |
| London Riverside College Ltd | Education | 2024 |
| London School of Excellence Ltd | Education | 2013 |
| London School of IT Education Ltd | Education | 2020 |
| London Shopfronts Limited | Extraterritorial | 2011 |
| London Tyre Services Limited | Wholesale & retail | 2010 |
| London Tyres (Hornchurch) Ltd | Wholesale & retail | 2022 |
| London Underpinning Ltd | Construction | 2013 |
| London Will Writing Limited | Professional & scientific | 2017 |
| Londono Traders Ltd | Wholesale & retail | 2025 |
| Lorstan Ltd | Health & social care | 2022 |
| Lotessa Limited | Wholesale & retail | 2025 |
| Loughton Bathrooms Ltd | Wholesale & retail | 2015 |
| Loughton Electrical Contractors Limited | Construction | 2011 |
| Louis Enterprises Ltd | Wholesale & retail | 2020 |
| Louis Medical Consultancy Limited | Health & social care | 2019 |
| Louise Kelly Ltd | Wholesale & retail | 2016 |
| Love From Violet Limited | Administrative & support | 2005 |
| Love to Shop Local Limited | Professional & scientific | 2015 |
| LOVE2TAN Limited | Other services | 2026 |
| Loveit Ltd | Information & communication | 2016 |
| Lovell Property Maintenance Limited | Real estate | 2007 |
| Lowcodesoftware Ltd | Information & communication | 2025 |
| Lowe Build Limited | Construction | 2026 |
| Lower Mill Estate Homeowners Association Limited | Households | 2019 |
| LR Construction Ltd | Construction | 2023 |
| LRM Survey Services Ltd | Construction | 2014 |
| LS Global London Limited | Real estate | 2014 |
| Lsoe Global Ltd | Professional & scientific | 2025 |
| LT UK Properties Ltd | Real estate | 2022 |
| LTE Evolution Ltd | Professional & scientific | 2025 |
| Ltrade Ltd | Professional & scientific | 2019 |
| Luagreen Limited | Transport & logistics | 2018 |
| Lucas Event Solutions Limited | Administrative & support | 2021 |
| Lucas Holdings Ltd | Real estate | 2024 |
| Luck Transport Ltd | Transport & logistics | 2025 |
| Luckmar Haulage Ltd | Construction | 2016 |
| Lucy&Da Ltd | Construction | 2016 |
| Ludus Academy Ltd | Arts & recreation | 2022 |
| Ludus Community CIC | Arts & recreation | 2024 |
| Luff Consultants Limited | Professional & scientific | 2006 |
| LUI Foods Limited | Wholesale & retail | 2015 |
| Luke Burr Ltd | Information & communication | 2024 |
| Lumen Later Life Living PTY Ltd | Education | 2018 |
| Luminoustilt Ltd | Hospitality | 2025 |
| Luna&Vlad Ltd | Transport & logistics | 2025 |
| Lush Green Ltd | Education | 2015 |
| Lushi Electrics Ltd | Construction | 2023 |
| Lushi's Plumbers Ltd | Construction | 2020 |
| LUX Clothing Limited | Wholesale & retail | 2025 |
| LUX Homes Assets Ltd | Real estate | 2019 |
| LUX Homes Builders Limited | Construction | 2025 |
| LUX Homes Property Group Limited | Real estate | 2016 |
| Luxe Electrical Contractors Ltd | Construction | 2022 |
| Luxe Meraki Ltd | Other services | 2025 |
| Luxeflooring Ltd | Construction | 2024 |
| Luxereign Ltd | Wholesale & retail | 2025 |
| Luxjen Investments Limited | Real estate | 2017 |
| Luxury Ice Cream (Chelmsford) Limited | Hospitality | 2025 |
| Luxury Nails 100 Ltd | Other services | 2023 |
| LVB Contracts Ltd | Construction | 2012 |
| LVT Media Ltd | Professional & scientific | 2018 |
| Lydian Consulting Ltd | Information & communication | 2019 |
| Lymphway Ltd | Health & social care | 2021 |
| Lyndale Building Limited | Construction | 2008 |
| Lyndhurst Dental Practice Limited | Health & social care | 2007 |
| Lynne London Ltd | Wholesale & retail | 2023 |
| Lynx Construction Group Limited | Construction | 2023 |
| Lynx Waterproofing Ltd | Construction | 2023 |
| Lyon Estates 1955 Limited | Real estate | 2024 |
| Lyongate Developments (Holdings) Limited | Financial services | 2023 |
| Lyongate Developments Limited | Construction | 2022 |
| Lytton General Wholesalers Limited | Wholesale & retail | 1978 |
| M & G Construction Group Limited | Construction | 2019 |
| M & J Davis Ltd | Health & social care | 2019 |
| M & J Fitters Limited | Manufacturing | 2025 |
| M & K Electrical & Data Limited | Construction | 2012 |
| M & M Accounts and Tax Services Limited | Professional & scientific | 2002 |
| M & M Consultants Global Ltd | Professional & scientific | 2014 |
| M & T Deliveries Ltd | Transport & logistics | 2021 |
| M Coleman Consultant Ltd | Professional & scientific | 2024 |
| M Crawley Plumbing & Heating Ltd | Construction | 2013 |
| M D Barzoukas Limited | Construction | 2018 |
| M P Electrical and Communications Services Ltd | Information & communication | 2017 |
| M T & F Services Ltd | Health & social care | 2020 |
| M&A Property Ventures Ltd | Real estate | 2014 |
| M&C Dining Co Limited | Hospitality | 2024 |
| M&D Business Ventures Ltd | Hospitality | 2020 |
| M&J Consulting Services Ltd | Professional & scientific | 2018 |
| M&M Cleaning Support Services Ltd | Administrative & support | 2020 |
| M&N Carpet and Flooring Ltd | Construction | 2019 |
| M&N Pro Ltd | Construction | 2020 |
| M&S DOC Limited | Health & social care | 2015 |