| Krishna Food Specification Services Limited | Administrative & support | 2014 |
| KSM Finance Solutions Ltd | Professional & scientific | 2025 |
| Kstylist Ltd | Wholesale & retail | 2021 |
| Kunda Travel Ltd | Professional & scientific | 2024 |
| Kutan Ural Design Studio Ltd | Professional & scientific | 2017 |
| Kutanios Limited | Professional & scientific | 2017 |
| KWK PT Limited | Arts & recreation | 2023 |
| Kynoch Services Ltd | Professional & scientific | 2023 |
| Kyzen Intelligence Technology Limited | Information & communication | 2025 |
| L&D Contractors Ltd | Construction | 2011 |
| L&D Decorating Ltd | Construction | 2018 |
| L.A. General Building Ltd | Construction | 2010 |
| LA 32 Eastway Limited | Construction | 2023 |
| LA Chouette School Limited | Education | 2010 |
| LA Luminosite Aesthetic & Beauty Clinic Limited | Other services | 2022 |
| LA Pearlin Ltd | Wholesale & retail | 2022 |
| LA Providence Systems Limited | Information & communication | 2006 |
| LA Sitrene Ltd | Wholesale & retail | 2023 |
| LAB Project LLP | | 2025 |
| Labolabo Ltd | Transport & logistics | 2019 |
| Lacoste Nightlife Entertainment Ltd | Administrative & support | 2017 |
| Lagattolla Group Ltd | Information & communication | 2016 |
| Lagoon Media Limited | Information & communication | 2003 |
| LAI Consulting GBR Limited | Information & communication | 2017 |
| LAI Soft Limited | Extraterritorial | 2013 |
| Lake Cassidy Corporation Ltd | Information & communication | 2018 |
| Laminateright Ltd | Construction | 2018 |
| Lamo Pizza Ltd | Hospitality | 2024 |
| Lampurama Ltd | Wholesale & retail | 2023 |
| Langham Airport Express Ltd | Other services | 2007 |
| Lansdowne Housing & Care Ltd | Hospitality | 2024 |
| Laparyky Health Limited | Health & social care | 2022 |
| Larozzi Sunshine Limited | Extraterritorial | 2021 |
| Last Minute Drive Ltd | Transport & logistics | 2026 |
| Lastproject Ltd | Real estate | 2025 |
| LAT 32 Eastway Limited | Construction | 2023 |
| Lavender Gold Ltd | Wholesale & retail | 2021 |
| Lavwill Ltd | Arts & recreation | 2024 |
| LB 1NE Ltd | Other services | 2025 |
| LB KBB Limited | Construction | 2026 |
| Lb-Chancery Lane Ltd | Manufacturing | 2023 |
| LBL Studio Ltd | Manufacturing | 2026 |
| LC Belgravia Limited | Wholesale & retail | 2023 |
| LDF Investments Ltd | Real estate | 2025 |
| LE Heights Ltd | Real estate | 2022 |
| LE NID Childcare Ltd | Professional & scientific | 2011 |
| Leaseguard Limited | Financial services | 1999 |
| Lebaneats Franchising Ltd | Transport & logistics | 2020 |
| Leckie Joiners Ltd | Construction | 2017 |
| Leeds 23 Ltd | Real estate | 2023 |
| Legacy Airport Transfer Ltd | Transport & logistics | 2023 |
| Leidon Limited | Construction | 2015 |
| Leidon Propco Ltd | Real estate | 2024 |
| Leivaire (UK) Limited | Wholesale & retail | 2011 |
| Lema Properties Ltd | Real estate | 2026 |
| Lena Nails PNL Ltd | Other services | 2026 |
| Lennart FM Ltd | Real estate | 2020 |
| Lennart Holdings Ltd | Financial services | 2025 |
| Lennart Homes Ltd | Construction | 2025 |
| Lexema Ltd | Wholesale & retail | 2023 |
| LH Traders Limited | Other services | 2021 |
| LHL Consulting Ltd | Professional & scientific | 2017 |
| LHL Property Maintenance Ltd | Construction | 2012 |
| Lifenity International Health Services Limited | Health & social care | 2022 |
| Lighter House Care Limited | Health & social care | 2023 |
| Like a Diva Limited | Wholesale & retail | 2017 |
| Lila Villas Ltd | Hospitality | 2020 |
| Lime Tree Research Ltd | Professional & scientific | 2023 |
| Lime-Tree Cleaners Limited | Administrative & support | 2020 |
| Limetree Properties 2025 Limited | Construction | 2025 |
| Lindt & Ferrero Ltd | Wholesale & retail | 2025 |
| Link IT Solutions Limited | Information & communication | 2001 |
| Linkforge Ltd | Information & communication | 2026 |
| Lionard Luxury Real Estate & Investment Ltd | Financial services | 2023 |
| Lioncrest Legal Services Limited | Professional & scientific | 2026 |
| Lionel Road Developments Ltd | Real estate | 2006 |
| Litehealth Ltd | Health & social care | 2025 |
| Litmus Graphics Limited | Arts & recreation | 2009 |
| Little Giants Media Ltd | Information & communication | 2020 |
| Little India Kensigton Ltd. | Hospitality | 2017 |
| Little Jungle (U.K.) Limited | Education | 2009 |
| Live Electrical Services Limited | Construction | 2019 |
| Live Like a VIP Limited | Information & communication | 2009 |
| Livestock Live Limited | Wholesale & retail | 2014 |
| Llamitai Solutions Ltd | Information & communication | 2026 |
| Llenroc Ltd | Professional & scientific | 2023 |
| LMJ Solutions Ltd | Information & communication | 2016 |
| Lmsk Properties Ltd | Real estate | 2019 |
| Load Short 6.0 Ltd | Information & communication | 2024 |
| Local BOY Ltd | Hospitality | 2019 |
| Logica Logistics Limited | Transport & logistics | 2016 |
| Lokalyze Group Ltd | Information & communication | 2020 |
| Lomaran Ltd | Wholesale & retail | 2025 |
| Lomex Ltd | Wholesale & retail | 2025 |
| London - Paris - New York Enterprises Limited | Arts & recreation | 1999 |
| London Academy of Media and Public Relations Ltd | Education | 2020 |
| London Advanced Materials & Processes Ltd | Manufacturing | 2020 |
| London Baptist Church | Other services | 2011 |
| London Bike Hub | Arts & recreation | 2010 |
| London Brilliant Roofing Ltd | Construction | 2025 |