| Luigi Bella Holdings Limited | Financial services | 2015 |
| Lulabel and Julie Limited | Households | 2025 |
| Luling Ltd | Real estate | 2026 |
| Lumeth Consulting Ltd | Information & communication | 2025 |
| Lumia MCR Ltd | Other services | 2025 |
| Lumine Soft Limited | Information & communication | 2020 |
| Lumo Analytics OY Limited | Wholesale & retail | 2025 |
| Lumy 5* Hospitality & Catering Ltd | Hospitality | 2025 |
| Lunar 101 Limited | Financial services | 2016 |
| Lune DE Miel Studio Ltd | Professional & scientific | 2023 |
| Lunts Heath Investment Co Limited | Real estate | 2024 |
| Lunts Heath Widnes SPV Limited | Real estate | 2024 |
| Lurchwell Ltd | Extraterritorial | 2014 |
| Luso Market Ltd | Other services | 2025 |
| Lusoconnectionuk CIC | Information & communication | 2022 |
| Luster Glam Ltd | Other services | 2025 |
| Luton CG 2 Ltd | Extraterritorial | 2025 |
| Luton CG Ltd | Extraterritorial | 2025 |
| Luton High Town Ltd | Extraterritorial | 2021 |
| Luuma Air Solutions Ltd | Construction | 2025 |
| LUV2SLEEP Limited | Wholesale & retail | 2013 |
| Luwasuite Ltd | Information & communication | 2025 |
| LUX Freedom Limited | Financial services | 2024 |
| LUX Jessie Ltd | Wholesale & retail | 2026 |
| LUX Lorenz Ltd | Wholesale & retail | 2024 |
| Luxdiary Ltd | Wholesale & retail | 2024 |
| Luxelumy Ltd | Wholesale & retail | 2024 |
| Luxikids Limited | Wholesale & retail | 2024 |
| Luxurious Properties Limited | Professional & scientific | 2007 |
| Luxury Curl Care Ltd | Wholesale & retail | 2025 |
| Luzaro Doreza Ltd | Wholesale & retail | 2025 |
| LWO Trading Ltd | Wholesale & retail | 2025 |
| LY Estates Ltd | Real estate | 2014 |
| Lydiatetv Ltd | Information & communication | 2026 |
| Lyheden Solutions Ltd | Administrative & support | 2025 |
| Lynch’S Lock and Key Ltd. | Administrative & support | 2023 |
| Lyndos Limited | Administrative & support | 2005 |
| Lyntel & Blake Services Limited | Administrative & support | 2021 |
| Lynwood Court (Crumpsall) Management Company Limited | Households | 1971 |
| Lysander Student Properties Investments Limited | Financial services | 2014 |
| Lysander Student Properties Limited | Construction | 2014 |
| Lysander Student Properties Operations Limited | Construction | 2014 |
| Lūchaus Ltd | Professional & scientific | 2025 |
| M & I Materials Limited | Manufacturing | 1992 |
| M & M Benedikt Ltd | Real estate | 2018 |
| M & M Fire Protection Limited | Public administration | 2017 |
| M & M Heaton Ltd | Hospitality | 2022 |
| M & M Management Ltd | Real estate | 2024 |
| M & R Ball Ltd | Real estate | 2022 |
| M & R Fire Limited | Construction | 2020 |
| M B Media & Services Ltd | Information & communication | 2025 |
| M J Rope Access Solutions Limited | Professional & scientific | 2017 |
| M Kelly Limited | Construction | 2015 |
| M Lopes TM Ltd | Construction | 2022 |
| M M R Estates Ltd | Real estate | 2009 |
| M Northcott-Engineering Services Limited | Professional & scientific | 2025 |
| M S Auto Body Work Ltd | Wholesale & retail | 2020 |
| M&A Rentals Ltd | Real estate | 2024 |
| M&B Interprise Limited | Wholesale & retail | 2026 |
| M&C Interiors & Designs Ltd | Construction | 2025 |
| M&C Media Walls Ltd | Construction | 2022 |
| M&Cw Services Ltd | Other services | 2021 |
| M&G Properties and Maintenance Ltd | Real estate | 2024 |
| M&H West Investments SUB Ltd | Real estate | 2026 |
| M&I Materials Holdings Limited | Financial services | 2023 |
| M&M Developments Ltd | Real estate | 2026 |
| M&M Sales Limited | Wholesale & retail | 2017 |
| M&N Luxe Limited | Wholesale & retail | 2025 |
| M&R Labour Supply Ltd | Manufacturing | 2025 |
| M&S Property Management Ltd | Real estate | 2017 |
| M&S Trading MCR Ltd | Wholesale & retail | 2019 |
| M&Sh Estates Limited | Real estate | 2026 |
| M'Cr Signage Ltd | Manufacturing | 2020 |
| M'S London Conveyancing Ltd | Professional & scientific | 2025 |
| M-Corp Management Limited | Information & communication | 2018 |
| M. Comar & Sons Limited | Wholesale & retail | 1974 |
| M.B UK Solutions Limited | Water & waste | 2024 |
| M.C.P.B.Property Ltd | Real estate | 2024 |
| M.E Law Ltd | Administrative & support | 2023 |
| M.J Phoenix Ltd. | Hospitality | 2015 |
| M.M.C & E Ltd | Real estate | 2023 |
| M.R. Scribe Limited | Other services | 2012 |
| M.R.M Recruitment Ltd | Construction | 2023 |
| M3 Convenience Store Limited | Wholesale & retail | 2025 |
| M3 Future Group Ltd | Wholesale & retail | 2022 |
| M3 Industries Limited | Manufacturing | 2014 |
| M3 Perform Ltd | Arts & recreation | 2017 |
| M3FACADES Limited | Construction | 2024 |
| M5 Sneakrs Ltd | Wholesale & retail | 2021 |
| M6 Auto Care Ltd | Wholesale & retail | 2023 |
| M6 Burgers Ltd | Hospitality | 2025 |
| M6 Car Centre Ltd | Wholesale & retail | 2022 |
| M6R Ltd | Information & communication | 2024 |
| M7 Auto Service & Tyre Ltd | Wholesale & retail | 2020 |
| M7 Estates Ltd | Real estate | 2023 |
| M7 Investments Limited | Real estate | 2024 |
| M7 Master Limited | Hospitality | 2022 |
| M7 Property Group Ltd | Real estate | 2023 |
| M7PACKAGING Ltd | Wholesale & retail | 2024 |
| MA Commercial Properties Limited | Real estate | 2004 |