| Kola Arala Osula Egbenuleghe Sound System Limited | Administrative & support | 2025 |
| Kolarin Properties Ltd | Real estate | 2024 |
| Kris-Lane Transport Ltd | Transport & logistics | 2018 |
| KS Plumbing and Heating Ltd | Construction | 2024 |
| Kskt Consultancy Limited | Information & communication | 2015 |
| Kuka Transport Ltd | Transport & logistics | 2016 |
| Kwame&Ckms Ltd | Construction | 2020 |
| Kymet Limited | Real estate | 2024 |
| Ky’S Lash LAB Limited | Other services | 2025 |
| L & C Drive Limited | Transport & logistics | 2010 |
| L Oscar Property Ltd | Real estate | 2020 |
| L&S Construction London Ltd | Construction | 2023 |
| L. Popsy (UK) Limited | Health & social care | 2019 |
| L.Nidelea Telecom Ltd | Information & communication | 2022 |
| L.Sansom Ltd | Real estate | 2023 |
| LAC Global Limited | Wholesale & retail | 2021 |
| Ladn Limited | Health & social care | 2009 |
| Ladn Tilbury Limited | Health & social care | 2019 |
| Lady Ombré Limited | Other services | 2021 |
| Lakee Como Ltd | Households | 2025 |
| Lakeside Medical Diagnostics Limited | Health & social care | 2009 |
| Lamobuk Limited | Wholesale & retail | 2014 |
| LAN Transport 94 Ltd | Transport & logistics | 2018 |
| Larbod Services Ltd | Real estate | 2026 |
| LDA Transport Limited | Transport & logistics | 2018 |
| LE Top Delivery Ltd | Transport & logistics | 2025 |
| Le'Care Limited | Health & social care | 2019 |
| Leave to Live Limited | Health & social care | 2017 |
| Lecareproperty Ltd | Real estate | 2025 |
| Legal Bees Limited | Other services | 2018 |
| LEK UK Scaffolding Ltd | Construction | 2015 |
| Lemz Studioz Limited | Information & communication | 2024 |
| Lera Healthcare Limited | Health & social care | 2024 |
| Letticia Donkor Ltd | Professional & scientific | 2019 |
| Lian Ltd | Real estate | 2023 |
| Liftcore Limited | Wholesale & retail | 2026 |
| Lighthouse Counselling Services FAD Limited | Health & social care | 2023 |
| Lilian Transport UK Ltd | Transport & logistics | 2021 |
| Limelight Horticulture Ltd | Administrative & support | 2021 |
| Linford Lodge Ltd | Health & social care | 2021 |
| Link Shop Fittings Ltd | Construction | 2012 |
| Liya Foods Ltd | Hospitality | 2025 |
| LJ Incorp Limited | Wholesale & retail | 2025 |
| Ljcc Limited | Real estate | 2021 |
| LKD Homes Ltd | Households | 2024 |
| LNG Ltd | Transport & logistics | 2024 |
| Lobianco Showtile Ltd | Construction | 2018 |
| Lockey Property Group Ltd | Real estate | 2024 |
| Logi & Luxsa Limited | Real estate | 2020 |
| Logistics Academy East of England Limited | Professional & scientific | 2007 |
| London Aggregates Terminal Ltd | Wholesale & retail | 2025 |
| London Bodyworks Ltd | Wholesale & retail | 2020 |
| London Container Terminal (Tilbury) Holdings Limited | Extraterritorial | 2011 |
| London Container Terminal (Tilbury) Limited | Extraterritorial | 1976 |
| London Haulage Express Ltd | Transport & logistics | 2018 |
| Lotica&Elena Ltd | Transport & logistics | 2018 |
| Lotus Amar Services Limited | Other services | 2024 |
| Lovell Facilities Ltd | Administrative & support | 2024 |
| Lovely Colours Ltd | Other services | 2008 |
| Lovingtheword Ltd | Wholesale & retail | 2025 |
| LR Consultancy Solutions Ltd | Professional & scientific | 2024 |
| Lshm Logistics Ltd | Transport & logistics | 2023 |
| LT Parcel Express Ltd | Transport & logistics | 2016 |
| Luhambo Group Limited | Health & social care | 2015 |
| Lukosi Global Traders Ltd | Professional & scientific | 2009 |
| Lume Lodgings Limited | Hospitality | 2025 |
| Lumen 1STUDIO Ltd | Professional & scientific | 2026 |
| Lumeras Group UK Ltd | Wholesale & retail | 2025 |
| Lumic Ltd | Information & communication | 2011 |
| Luxness Sparkle Ltd | Administrative & support | 2021 |
| Luxury Catering Solutions Ltd | Hospitality | 2024 |
| Lynch Traffic Management Limited | Construction | 2022 |
| Lynette Psychotherapy Ltd | Health & social care | 2026 |
| Lyon Express Ltd | Transport & logistics | 2015 |
| LYT Concepts Ltd | Wholesale & retail | 2025 |
| Lyves Care Solution Ltd | Health & social care | 2025 |
| M Legacy Property Holdings Ltd | Real estate | 2026 |
| M Ndouaarab Services Ltd | Construction | 2025 |
| M O J Properties Services Limited | Households | 2025 |
| M&A Trans Ltd | Transport & logistics | 2020 |
| M&S Containers Ltd | Wholesale & retail | 2026 |
| M&V Property Developers Ltd | Construction | 2022 |
| M-Sport Wheels Limited | Wholesale & retail | 2014 |
| M.I.M.Y Professional Cleaners Ltd | Administrative & support | 2022 |
| M.Jaks Solutions Ltd | Transport & logistics | 2024 |
| M.T.M Healthcare Limited | Health & social care | 2014 |
| Mabijoe Services Ltd | Construction | 2019 |
| MAC & DON Care Ltd | Health & social care | 2014 |
| Magnolia House (West Byfleet) Management Limited | Households | 2025 |
| Mahesh Medical Services Limited | Professional & scientific | 2012 |
| Maheshgill Ltd | Transport & logistics | 2018 |
| Majbros Limited | Other services | 2019 |
| Maknova Ltd | Wholesale & retail | 2026 |
| Mallou Prod Global Services Limited | Transport & logistics | 2025 |
| Manna Nourishment Ltd | Health & social care | 2015 |
| Manny Building Services Ltd | Other services | 2018 |
| Manu&David Trans Ltd | Transport & logistics | 2020 |
| Marakwe Limited | Real estate | 2023 |
| Maras Trans Limited | Transport & logistics | 2016 |
| Marian Oita Transport Limited | Transport & logistics | 2020 |