| Lovjen Limited | Professional & scientific | 2005 |
| LOW CO2 Vehicle Rental Limited | Extraterritorial | 2012 |
| Lphp Limited | Professional & scientific | 2017 |
| Lpips Trustee Limited | Extraterritorial | 2022 |
| LR Academy Ltd. | Education | 2015 |
| LRY Ltd | Construction | 2026 |
| LS Consultancy UK Limited | Information & communication | 2008 |
| LS Planning & Consultancy Ltd | Professional & scientific | 2026 |
| LT Sanders Limited | Construction | 2012 |
| LTA MEP Limited | Professional & scientific | 2024 |
| Lucca D Ltd | Education | 2019 |
| Lucid Brand Limited | Professional & scientific | 2005 |
| Lucie Clarke Equine Enterprises Limited | Agriculture & fishing | 2022 |
| Lucky Dods Trading Ltd | Real estate | 2018 |
| Lucky Tree Ltd | Information & communication | 2013 |
| Luesim Limited | Information & communication | 2014 |
| Lugera Holdings UK Ltd | Financial services | 2019 |
| Lukas Wasilewski Ltd | Wholesale & retail | 2025 |
| Lulu Maison Interiors Limited | Professional & scientific | 2024 |
| Lulzim Investment Ltd | Real estate | 2018 |
| Lumen Alpha Ventures Ltd | Financial services | 2026 |
| Lumen Financial Ltd | Professional & scientific | 2026 |
| Lumera Partners Ltd | Professional & scientific | 2026 |
| Lumia Home H&D Ltd | Real estate | 2024 |
| Luminary Lens TV Ltd | Information & communication | 2025 |
| Luminat Learning Ltd | Education | 2025 |
| Luminii Consulting Limited | Professional & scientific | 2017 |
| Lumonyx Ltd | Agriculture & fishing | 2025 |
| Lumosigns UK Ltd | Wholesale & retail | 2020 |
| Luna Coffee & Restaurant Ltd | Hospitality | 2023 |
| Luna Tanning Ltd | Other services | 2019 |
| Lux-Me Properties Ltd | Real estate | 2020 |
| Luxe Glow Surrey Ltd | Other services | 2026 |
| Luxe Interiors Surrey Ltd | Administrative & support | 2017 |
| Luxe Line Transport Ltd | Transport & logistics | 2024 |
| Luxe Retreats Ltd | Arts & recreation | 2018 |
| Luxury Decorations Ltd | Construction | 2006 |
| Luxury Events Hospitality Limited | Hospitality | 2025 |
| Luxvibeweb Limited | Information & communication | 2026 |
| LW1 Properties Ltd | Real estate | 2026 |
| LXL Creative Limited | Professional & scientific | 2021 |
| Lynd Asset Protection Services Ltd | Professional & scientific | 2023 |
| Lynd Consultancy Services Ltd | Professional & scientific | 2023 |
| Lynd Ltd | Professional & scientific | 2010 |
| Lyngarth Close (Bookham) Management Company Limited | Households | 2007 |
| Lynmac Construction Limited | Construction | 2006 |
| Lynton Court (Sutton) Freehold Limited | Real estate | 2004 |
| Lyon Properties Ltd | Professional & scientific | 2018 |
| Lyra Medical Ltd | Health & social care | 2026 |
| Lysander Gardens Residents Company Limited | Households | 1995 |
| Lysi Solutions Ltd | Professional & scientific | 2021 |
| LZS Building Services Ltd | Construction | 2011 |
| L’Unico Bespoke Design Ltd | Construction | 2019 |
| M a R Reserves Limited | Real estate | 2025 |
| M and M Beautyproducts Limited | Wholesale & retail | 2021 |
| M D Sign Installations & Maintenance Ltd | Construction | 2017 |
| M I Trading Co. UK Limited | Wholesale & retail | 2024 |
| M LE DUC Limited | Information & communication | 2007 |
| M N Carpentry Services Ltd | Manufacturing | 2023 |
| M T Heating & Plumbing Ltd | Construction | 2017 |
| M&J Barbers Ltd | Other services | 2024 |
| M&O Surrey Limited | Wholesale & retail | 2022 |
| M&S Group London Ltd | Wholesale & retail | 2025 |
| M.C. Managements (Tolworth) Limited | Households | 1965 |
| M.E.B Group Limited | Wholesale & retail | 2020 |
| M.E.B Vehicle Sales Ltd | Wholesale & retail | 2019 |
| M.E.B Vehicle Services Ltd. | Wholesale & retail | 2016 |
| M.L.Donchev Limited | Construction | 2018 |
| M24 Media Ltd | Information & communication | 2025 |
| MA Accounting & Taxation Limited | Professional & scientific | 2002 |
| Maan's Properties Limited | Real estate | 2021 |
| Maan's Sports Management Limited | Arts & recreation | 2022 |
| Mabs Francis Limited | Hospitality | 1977 |
| MAC Court Management Company Ltd | Households | 2015 |
| MAC D Music Ltd | Information & communication | 2016 |
| MAC Softwares Limited | Information & communication | 2019 |
| Macdonald Group Ventures Ltd | Financial services | 2024 |
| Mach 5 Properties Limited | Real estate | 2018 |
| MACH41 Ltd | Information & communication | 2025 |
| Mackenzie Developments Ltd | Construction | 2023 |
| Mackey Mouldings Ltd | Construction | 2020 |
| MACLEODS2FLY Limited | Transport & logistics | 2016 |
| Macrae Solutions Ltd | Information & communication | 2024 |
| Maeve Rutten Limited | Professional & scientific | 2020 |
| Mafea Limited | Health & social care | 2025 |
| MAG Surrey Limited | Construction | 2010 |
| Magellanic Cloud Ltd | Administrative & support | 2023 |
| Maggie's Leisure Limited | Hospitality | 2022 |
| Maghreb Investments Limited | Real estate | 2003 |
| Magic Carpet & Upholstery Cleaning Limited | Other services | 2011 |
| Magic Lounge Ltd | Hospitality | 2023 |
| Magnolia Swindon Ltd | Construction | 2015 |
| Maine Road Consulting Ltd | Information & communication | 2024 |
| Maini Property Investment Limited | Construction | 2018 |
| Mainly Maple Limited | Hospitality | 2017 |
| Maintenance&Construction Limited | Construction | 2024 |
| Maison Delaiche Ltd | Wholesale & retail | 2025 |
| Majestic Leisure Ltd | Wholesale & retail | 2007 |
| Makiavel Limited | Hospitality | 2025 |
| Malachite Holdings Ltd | Financial services | 2020 |