| Limitless Aspirations Ltd | Real estate | 2018 |
| Limitless Ceilings Limited | Construction | 2018 |
| Limitless Shielding Ltd | Manufacturing | 2018 |
| Limpid Glow Ltd | Wholesale & retail | 2024 |
| Linas Butkus Ltd | Construction | 2022 |
| Linden & Co.(Antiques)Limited | Wholesale & retail | 1960 |
| Lingwell Consulting Limited | Administrative & support | 2015 |
| Link Homes (Essex) Limited | Construction | 1967 |
| Link Mastics Limited | Construction | 1973 |
| Linka Travels Ltd | Administrative & support | 2025 |
| Linklease Finance PLC | Financial services | 2018 |
| Linq Client Services Limited | Professional & scientific | 2021 |
| Linq Office Services Limited | Professional & scientific | 2021 |
| Lion Build & Construct Limited | Construction | 2016 |
| Lion Mountain Media Collective Limited | Education | 2022 |
| Lion Mountain Media Group Limited | Information & communication | 2022 |
| Lions Supplements Limited | Wholesale & retail | 2025 |
| Liontree Publications Limited | Information & communication | 2010 |
| Lipnik Limited | Administrative & support | 2016 |
| Lipscombe Calibration Services Ltd | Professional & scientific | 2019 |
| Lisgram Securities Limited | Real estate | 1968 |
| Lish Losh Productions Limited | Professional & scientific | 2017 |
| Litauen Transport Limited | Transport & logistics | 2020 |
| Littea Property Ltd | Real estate | 2022 |
| Little Friends Pre-School Limited | Education | 2009 |
| Little Geniuses Ltd | Wholesale & retail | 2025 |
| Little Hooves Celebration Ltd | Arts & recreation | 2026 |
| Little Leaps Day Care Basildon Limited | Health & social care | 2025 |
| Little Leaps Day Care Limited | Education | 2019 |
| Little Stars Theatre Workshops Ltd | Arts & recreation | 2015 |
| Little Steps Education Ltd | Education | 2025 |
| Little Sunshine Ltd | Education | 2024 |
| Little Teddies Nursery Basildon Ltd | Health & social care | 2019 |
| Littmoden Plant Hire Limited | Other services | 2015 |
| LIV 02 Trans Ltd | Transport & logistics | 2022 |
| LIV Property Holdings Ltd | Real estate | 2023 |
| Livegrange Limited | Real estate | 1992 |
| Liviu Delivery Solutions Ltd | Transport & logistics | 2016 |
| Lizoye Properties & Investment Ltd | Real estate | 2019 |
| Lizzy LDN Ltd | Wholesale & retail | 2026 |
| Lizzybaby Limited | Administrative & support | 2023 |
| LJ Electrics Limited | Construction | 2008 |
| LJ Groundworks&Civils Ltd | Water & waste | 2022 |
| Lj's Executive Travel Limited | Other services | 2024 |
| LJC Lettings Limited | Real estate | 2010 |
| LJR Hair and Beauty Limited | Other services | 2022 |
| Ljse Services Limited | Construction | 2017 |
| LK Electrics Limited | Construction | 2016 |
| LL Landscapes & Fencing Limited | Construction | 2017 |
| LL Landscapes Limited | Construction | 2017 |
| Lloyds Investments Group Holdings Limited | Administrative & support | 2005 |
| Lmac Services Ltd | Manufacturing | 2017 |
| LMI Electrical Ltd | Construction | 2025 |
| LMK C.O. Limited | Other services | 2022 |
| LML Estates Limited | Real estate | 2022 |
| LMT Holdings Group UK Limited | Professional & scientific | 2022 |
| LN Construction Ltd | Construction | 2013 |
| Ln&Nissi Ltd | Wholesale & retail | 2024 |
| LNP Hammond Limited | Arts & recreation | 2021 |
| LNR Lift Ltd | Construction | 2022 |
| LNR Projects Limited | Construction | 2021 |
| Loadworks Ltd | Transport & logistics | 2025 |
| Local Authority Registration & Coroner Services Association | Other services | 2009 |
| Localfete UK Limited | Information & communication | 2022 |
| Locareos Ltd | Arts & recreation | 2018 |
| Lock Associates Ltd | Professional & scientific | 2017 |
| Lockedout Solutions Ltd | Construction | 2025 |
| Lodge Tiling & Flooring Limited | Construction | 2018 |
| Logan Commissioning Services Ltd | Construction | 2023 |
| Logic Consultancy Ltd | Information & communication | 2018 |
| Logic Nominees Ltd | Extraterritorial | 2020 |
| Logic Recruit Limited | Construction | 2018 |
| Logic-Analytics Ltd | Information & communication | 2019 |
| Logical Mortgage Solutions Limited | Financial services | 2023 |
| Logistics Stefy Ianna Ltd | Transport & logistics | 2018 |
| Logstor UK Ltd | Wholesale & retail | 2017 |
| Loira Lingerie Limited | Wholesale & retail | 2025 |
| London ACR Ltd | Energy | 2024 |
| London Bumper Repair Limited | Wholesale & retail | 2018 |
| London Central Local Engineering Ltd | Transport & logistics | 2006 |
| London Construction Contracts Limited | Construction | 2014 |
| London Crepe Company Limited | Hospitality | 2023 |
| London Custom Steel Ltd | Manufacturing | 2019 |
| London Digital Print Ltd | Manufacturing | 2016 |
| London Ecofy Ltd | Construction | 2025 |
| London Electrical Contractor Services Limited | Construction | 2025 |
| London Energy Supplies and Services Limited | Professional & scientific | 1994 |
| London Grow Ltd | Wholesale & retail | 2013 |
| London Health and Safety Consultancy Ltd | Extraterritorial | 2014 |
| London Health Investments RM14 Limited | Wholesale & retail | 2020 |
| London Heights Property LLP | | 2013 |
| London Machinery Movement Ltd | Construction | 2023 |
| London Medical Consultants Limited | Health & social care | 2004 |
| London Orbital Projects Limited | | 1983 |
| London Plumbers and Heating Ltd | Construction | 2015 |
| London Social Kensington Limited | Other services | 2020 |
| London Success Academy Ltd | Education | 2024 |
| London Super Apps Ltd | Information & communication | 2023 |
| London Textiles Exports Ltd | Water & waste | 2017 |
| London Trip Ltd | Transport & logistics | 2024 |