| London Roofing and Leadwork Ltd | Construction | 2025 |
| London School of Infrastructure Engineering Ltd | Information & communication | 2026 |
| London Scrap Company Limited | Water & waste | 2012 |
| London Steel Limited | Other services | 2020 |
| London Stone Restoration Ltd | Construction | 2020 |
| London Tax Solutions Ltd | Professional & scientific | 2025 |
| London VIP Concierge Limited | Other services | 2011 |
| London VIP Group Limited | Other services | 2011 |
| Long Life Europe Limited | Health & social care | 2006 |
| Longman Media Co. Limited | Professional & scientific | 2020 |
| Look Lofts Limited | Construction | 2018 |
| Lord Associates (Services) Limited | Professional & scientific | 2004 |
| Lord Associates LLP | | 2007 |
| Lord Associates Taxation & Business Consultants Limited | Professional & scientific | 2007 |
| Lord Associates Taxation & Business Consultants LLP | | 2004 |
| Lords Court Limited | Construction | 2004 |
| Lorimer Terence Tucker Limited | Real estate | 1963 |
| Lorimer Thomas Tucker Limited | Extraterritorial | 2011 |
| Lorrells Property Limited | Real estate | 2018 |
| LOT 801 Limited | Real estate | 2016 |
| LOT 802 Limited | Real estate | 2016 |
| Loughton 2011 Limited | Professional & scientific | 2011 |
| Loughton Business Centre Management Company Limited | Administrative & support | 2006 |
| Loughton Community Gymnastics C.I.C. | Arts & recreation | 2015 |
| Loughton Consultants Limited | Professional & scientific | 2000 |
| Loughton Contracts PLC | Construction | 1992 |
| Loughton Decorators Ltd | Construction | 2019 |
| Loughton Hall Ltd. | Health & social care | 2019 |
| Loughton Homes Ltd | Real estate | 2018 |
| Loughton Lofts Ltd | Construction | 2015 |
| Loughton Ltd | Hospitality | 2018 |
| Loughton Masonic Centre Limited | Other services | 1910 |
| Loughton Master Build Limited | Construction | 2009 |
| Loughton Mobile Tyres Limited | Wholesale & retail | 2022 |
| Loughton Private GP Ltd | Health & social care | 2024 |
| Loughton Properties Ltd | Real estate | 2025 |
| Loughton Self-Drive Limited | Administrative & support | 1994 |
| Loughton Services Limited | Administrative & support | 1988 |
| Loughton Taekwondo Limited | Arts & recreation | 2023 |
| Loughton Tiling Limited | Construction | 2020 |
| Loughton United Football Club Limited | Professional & scientific | 2025 |
| Loughton Vision Limited | Health & social care | 2012 |
| Loughton Wimpy Ltd | Hospitality | 2012 |
| Loughtonglassoak Ltd | Construction | 2015 |
| Louis E Taylor Ltd | Information & communication | 2023 |
| Louisa's Honey Limited | Wholesale & retail | 2021 |
| Louise Bendall Consulting Ltd | Professional & scientific | 2023 |
| Love Laser and Skin Limited | Other services | 2020 |
| Loved NOT Lost Ltd | Wholesale & retail | 2024 |
| Lovejam Ltd | Other services | 2021 |
| Lovelock UK Film Investments LP | | 2012 |
| Loving Life With Bonny Ltd | Professional & scientific | 2023 |
| Lower Algers Property Co. Limited | Households | 1993 |
| LPB Groundworks Limited | Construction | 2024 |
| LRL Academy Ltd | Other services | 2023 |
| LRL Limited | Construction | 2015 |
| LRP Holdings Ltd | Real estate | 2023 |
| LSF Solutions Limited | Construction | 2018 |
| LT Legal Support Services Ltd | Professional & scientific | 2023 |
| LTW Coaching Ltd | Professional & scientific | 2016 |
| Lucas Associates Limited | Professional & scientific | 1999 |
| Lucius Properties Limited | Real estate | 2022 |
| Lucrum Limited | Professional & scientific | 2018 |
| Lucy & Martin (Recycling) Limited | Transport & logistics | 2003 |
| Lucy Aylen Ltd | Wholesale & retail | 2024 |
| Ludgate Broadway Limited | Construction | 2012 |
| Ludmill Ltd | Construction | 2016 |
| Luke T Barker Ltd | Administrative & support | 2024 |
| Lulin ALL Construction Ltd | Construction | 2018 |
| Luminous CAD Limited | Professional & scientific | 2024 |
| Lusso Real Estate Ltd | Real estate | 2022 |
| Luvtax Limited | Other services | 2019 |
| LUX Cooling Group Ltd | Administrative & support | 2017 |
| LUX15 Estates Limited | Real estate | 2025 |
| Luxevents Organisers Ltd | Professional & scientific | 2021 |
| Luxiety Stays Ltd | Real estate | 2021 |
| Luxon Property Limited | Real estate | 2013 |
| Luxon Technology Ltd | Information & communication | 2015 |
| Luxurious Club Ltd | Administrative & support | 2016 |
| Luxury Gardens Ltd | Construction | 2023 |
| Luxury Lifestyle Properties Ltd | Real estate | 2025 |
| Luxury Transfers Limited | Transport & logistics | 2018 |
| Luxxe Looks Ltd | Wholesale & retail | 2025 |
| LUZ Theatre Professionals Ltd | Health & social care | 2013 |
| LVA Enterprise Ltd | Real estate | 2024 |
| LWL Property Services Limited | Real estate | 2000 |
| LX Painting & Decorating Ltd | Construction | 2024 |
| Lydamore Property Developments Ltd | Real estate | 2023 |
| Lydia Voiku Ltd | Health & social care | 2025 |
| Lydiamain Limited | Administrative & support | 1976 |
| Lynn's Jewellery Ltd | Wholesale & retail | 2018 |
| Lyore Ltd | Wholesale & retail | 2024 |
| Lyra Stack Ltd | Information & communication | 2025 |
| Lyric Enterprises Limited | Hospitality | 2022 |
| Lyssa Pictures Limited | Information & communication | 2024 |
| Lytt Group Limited | Wholesale & retail | 2020 |
| L‘Arcada Limited | Professional & scientific | 2021 |
| M & E Jewellers Limited | Wholesale & retail | 2010 |
| M & M 216 Logistics Ltd | Transport & logistics | 2019 |
| M & V Houldings Ltd | Real estate | 2020 |