| Lion Automotive Group Ltd | Wholesale & retail | 2020 |
| Lionheart Developments Ltd | Construction | 2004 |
| Lionsdown Ltd | Professional & scientific | 2025 |
| Lisa Safe Care Limited | Administrative & support | 2025 |
| Lisbond Flat Management Limited | Households | 1996 |
| LIST2LET Limited | Real estate | 2024 |
| Litaraa Ltd | Manufacturing | 2025 |
| Little Amber Fish Limited | Wholesale & retail | 2001 |
| Little Celebrations Events Limited | Professional & scientific | 2025 |
| Little Celebrations London Limited | Professional & scientific | 2018 |
| Little Ember Limited | Other services | 2012 |
| Little GEM Nutrition Ltd | Hospitality | 2019 |
| Little Green Consultancy Limited | Real estate | 2022 |
| Little Grey House Limited | Administrative & support | 2014 |
| Little Hackney Limited | Information & communication | 2013 |
| Little Seahorses Ltd | Real estate | 2024 |
| Little Steps Health Limited | Health & social care | 2025 |
| Little Treehouse Ltd | Real estate | 2014 |
| Little Weaver London Ltd. | Wholesale & retail | 2010 |
| Littlebeech Limited | Households | 1993 |
| Littleberry Court Ltd | Real estate | 2025 |
| Littleton Homes Ltd | Real estate | 2021 |
| Live Frankly Limited | Information & communication | 2019 |
| Live Positive Ltd | Wholesale & retail | 2018 |
| Live Work Space (2011) LLP | | 2011 |
| Lived Lily Ltd | Real estate | 2023 |
| Livejoli Limited | Wholesale & retail | 2017 |
| Liverpool Capital Ltd | Real estate | 2019 |
| Liverpool Road Stoke Limited | Construction | 2019 |
| Liverpool Trading 2GO Limited | Hospitality | 2025 |
| Living Neurodivergent Limited | Other services | 2025 |
| LJM Services Ltd | Wholesale & retail | 2024 |
| LK Better Ltd | Other services | 2022 |
| LKD Trading Ltd | Transport & logistics | 2015 |
| LKK Holdings Ltd | Other services | 2024 |
| LKS Investment Limited | Real estate | 2018 |
| Llama Bars Limited | Hospitality | 2009 |
| Llandudno Dental Ltd | Health & social care | 2023 |
| Llma Property Limited | Real estate | 2023 |
| Lloydstek Ltd | Information & communication | 2013 |
| Llprodata Limited | Administrative & support | 2025 |
| LM Diffusion Limited | Wholesale & retail | 2026 |
| Lmapp Associates Limited | Professional & scientific | 2015 |
| LMK Electrics Ltd | Construction | 2019 |
| LML Group Advisory Ltd | Information & communication | 2025 |
| LML Residential Ltd | Real estate | 2025 |
| Lmmb UK Ltd | Wholesale & retail | 2025 |
| LND Suppliers Limited | Wholesale & retail | 2024 |
| Lndh Ltd | Administrative & support | 2024 |
| LNT Limited | Other services | 2009 |
| Local Boy'Z Group Holding Limited | Administrative & support | 2009 |
| Local Cars Borehamwood Limited | Transport & logistics | 2019 |
| Local Cruisers Limited | Transport & logistics | 2022 |
| Location 3 Projects Limited | Construction | 1997 |
| Location 3 Properties Limited | Construction | 1994 |
| Location Chauffeurs Limited | Transport & logistics | 2020 |
| Lockfit London North Ltd | Construction | 2024 |
| Lockfit London Uxbridge Ltd | Construction | 2024 |
| Lockfit London West Ltd | Construction | 2024 |
| Locum Group Limited | Administrative & support | 2023 |
| Locum Placement Group (UK) Limited | Professional & scientific | 2013 |
| Locum Placement Ltd | Administrative & support | 2020 |
| Lodge Flying Limited | Administrative & support | 1978 |
| LOG Brothers Limited | Agriculture & fishing | 2025 |
| Logic West Ltd | Information & communication | 2006 |
| Logica Nova Ltd | Information & communication | 2015 |
| Logical System Solutions Ltd | Professional & scientific | 2021 |
| Lokma Limited | Hospitality | 2017 |
| Lolys's Pearls Limited | Construction | 2026 |
| London & Country Homes Limited | Construction | 2001 |
| London & Overseas Developments Ltd | Hospitality | 2007 |
| London & Overseas Estates Ltd | Real estate | 2021 |
| London & Overseas Holdings Ltd | Real estate | 2021 |
| London & Overseas Ltd | Real estate | 2012 |
| London Art Limited | Wholesale & retail | 1996 |
| London Automotive Dealer Ltd | Wholesale & retail | 2026 |
| London Builders Construction Ltd | Construction | 2017 |
| London Capital Plus Ltd | Professional & scientific | 2013 |
| London Carpentry Design Ltd | Manufacturing | 2018 |
| London Chippy Limited | Hospitality | 2017 |
| London Circular Solution Services Ltd | Water & waste | 2026 |
| London Clothing Company Ltd | Administrative & support | 2012 |
| London Commercial Spares Limited | Wholesale & retail | 2008 |
| London Cosec Limited | Professional & scientific | 2026 |
| London Council of Mosques CIC | Education | 2024 |
| London Dairies Holdings Limited | Financial services | 2018 |
| London Dairies Limited | Wholesale & retail | 1995 |
| London Demolition Ltd | Construction | 2025 |
| London DJ & MC Academy CIC | Administrative & support | 2008 |
| London Event Deco Ltd | Arts & recreation | 2024 |
| London Fit OUT Ltd | Construction | 2009 |
| London Flow Screed Ltd | Construction | 2014 |
| London Footgolf and Football Leagues Ltd | Arts & recreation | 2020 |
| London Glamour Garden Limited | Wholesale & retail | 2024 |
| London Hair System Limited | Other services | 2024 |
| London Health and Aesthetics Limited | Health & social care | 2013 |
| London Hospitality Linen Limited | Other services | 2012 |
| London Jobs Limited | Wholesale & retail | 2009 |
| London Land and New Homes Limited | Real estate | 2014 |
| London Lites Ltd | Professional & scientific | 2012 |