| LRM Consultancy (UK) Limited | Professional & scientific | 2002 |
| LSB Pubs Ltd | Hospitality | 2025 |
| Lsjtransport Ltd | Transport & logistics | 2021 |
| LST Precision Fabrication Ltd | Professional & scientific | 2026 |
| LTS Global Solutions Group Limited | Extraterritorial | 2018 |
| LTS UK Holdings Limited | Financial services | 2020 |
| Luanshyaman Limited | Information & communication | 2013 |
| Lubor Ltd | Wholesale & retail | 2018 |
| Luca&Nini Ltd | Extraterritorial | 2022 |
| Lucas Arboricultural Consultancy Ltd | Professional & scientific | 2026 |
| Lucas Bond Consulting Limited | Professional & scientific | 2014 |
| Lucas Bond Holdings Ltd | Financial services | 2026 |
| Lucky 7 Haulage Ltd | Transport & logistics | 2024 |
| Lucky 7 Productions Ltd | Information & communication | 2021 |
| Lucky 916 Limited | Hospitality | 2023 |
| Ludaro Property Ltd | Real estate | 2024 |
| Lufapak Holdings Ltd | Financial services | 2011 |
| Lufex Ltd | Construction | 2018 |
| Luggaway Ltd | Manufacturing | 2019 |
| Lukasz Truck FIX Ltd | Wholesale & retail | 2026 |
| Luminate Golf Ltd | Construction | 2021 |
| Luna AV Limited | Administrative & support | 2023 |
| LUO FEA Engineering Consultant Ltd | Professional & scientific | 2024 |
| Lush Beauty & Spa Ltd | Wholesale & retail | 2025 |
| Lutf Ltd | Wholesale & retail | 2025 |
| LUX Property Cleaning Ltd | Administrative & support | 2025 |
| LUX Services UK Limited | Transport & logistics | 2005 |
| Luxe Nails Spa Ltd | Other services | 2025 |
| Luxe Tanning Lounge Ltd | Other services | 2024 |
| Luxfxpro Limited | Administrative & support | 2022 |
| LUXHOST2W Ltd | Information & communication | 2025 |
| Luxury by Mami Ltd | Other services | 2023 |
| Luxuryshimmerrugby Ltd | Administrative & support | 2024 |
| Luxxgoodsuk Limited | Wholesale & retail | 2023 |
| Lvon Ltd | Information & communication | 2025 |
| Lvsb Properties Ltd | Real estate | 2024 |
| LWB Agricultural Services Ltd | Agriculture & fishing | 2019 |
| Lydfi Consultancy Limited | Information & communication | 2025 |
| Lyons & Dean Limited | Information & communication | 2020 |
| M & B Fruits LLP | | 2012 |
| M & F Drivers Ltd | Transport & logistics | 2022 |
| M & M Engineering Services Limited | Information & communication | 2021 |
| M & M Holiday Let's Ltd | Hospitality | 2021 |
| M & M Jewellery (Rugby) Limited | Wholesale & retail | 2003 |
| M & M Retail LLP | | 2011 |
| M & P (Rugby) Limited | Wholesale & retail | 2011 |
| M & S Trading (UK) Limited | Wholesale & retail | 2013 |
| M a Keye Ltd | Health & social care | 2022 |
| M a O Driver Services Limited | Transport & logistics | 2020 |
| M and M International Ltd | Wholesale & retail | 2017 |
| M and R Logistics Limited | Transport & logistics | 2025 |
| M E Solar Ltd | Construction | 2016 |
| M J Automotive Services Ltd | Wholesale & retail | 2022 |
| M J Gallagher Holdings Limited | Financial services | 2025 |
| M J O'Connor Aviation Limited | Professional & scientific | 2013 |
| M J Smith Management Services Limited | Construction | 2015 |
| M P Doherty Construction Limited | Construction | 2017 |
| M S a Facilities Transport Ltd | Transport & logistics | 2022 |
| M Woodbridge Limited | Wholesale & retail | 2025 |
| M Wyllie Business Limited | Extraterritorial | 2023 |
| M&B Payroll Solution Ltd | Professional & scientific | 2017 |
| M&B Tax Services Ltd | Professional & scientific | 2016 |
| M&M Driving Ltd | Transport & logistics | 2018 |
| M&M Housing Private Limited | Real estate | 2025 |
| M&M Property Development (Midlands) Ltd | Real estate | 2025 |
| M&M Sales Lettings Ltd | Real estate | 2018 |
| M&P Talent Resourcing Ltd | Administrative & support | 2026 |
| M&W Finance Ltd | Administrative & support | 2026 |
| M. Uppal Limited | Wholesale & retail | 2007 |
| M.A.A.I. Enterprises Ltd | Extraterritorial | 2024 |
| M.A.L CAD Limited | Professional & scientific | 2000 |
| M.A.T Anyservice Ltd | Construction | 2022 |
| M.J.S. Bar and Catering Equipment Suppliers Limited | Wholesale & retail | 1986 |
| M.M. Investments Limited | Construction | 1989 |
| M.W Cars Painting Ltd | Construction | 2023 |
| M2S Investments Ltd | Financial services | 2021 |
| MA FRI Ltd | Health & social care | 2023 |
| Mabo Logistics Limited | Transport & logistics | 2014 |
| MAC Physio Ltd | Health & social care | 2015 |
| Macaylor Packaging Ltd | Construction | 2015 |
| Macaylor Property Group Limited | Financial services | 2023 |
| Macaylor Property Solutions Limited | Real estate | 2017 |
| Mach 1 Projects Ltd | Professional & scientific | 2020 |
| Mach P Designs Ltd | Wholesale & retail | 2025 |
| Machine Mind Ltd | Information & communication | 2018 |
| Machine Tool Partner Ltd | Administrative & support | 2016 |
| Mack Properties Rugby Limited | Real estate | 2006 |
| Mack Salon Limited | Other services | 2023 |
| Macoobo Limited | Administrative & support | 2013 |
| Macroscope Ltd | Professional & scientific | 2020 |
| MAD CAD Ltd | Professional & scientific | 2020 |
| Madaby Solutions Ltd | Administrative & support | 2023 |
| Madden's (Rugby) Limited | Wholesale & retail | 1957 |
| Madhouse Restaurants Limited | Hospitality | 1998 |
| Madison Creative Limited | Other services | 2011 |
| Madrid Padel Academy Ltd | Education | 2025 |
| Maffey Partners LLP | | 2024 |
| Magic Beans Limited | Professional & scientific | 2014 |
| Magic Dwellings Limited | Information & communication | 2021 |
| Magma Wealth Group Limited | Financial services | 2023 |