| Loreece Harrison Ltd | Arts & recreation | 2024 |
| Losite Care UK Ltd | Health & social care | 2019 |
| Lotsu Limited | Health & social care | 2015 |
| Lott Creative Limited | Professional & scientific | 2018 |
| Louise Parker (Health) Consulting Limited | Professional & scientific | 2015 |
| Louise's Cupcakes Ltd | Manufacturing | 2020 |
| Lounge 44 Limited | Hospitality | 2021 |
| Love From MUM Ltd | Wholesale & retail | 2024 |
| Love Soul Clinic Ltd | Health & social care | 2026 |
| Love, Leluu Limited | Other services | 2011 |
| Lovell Eatery Ltd | Hospitality | 2025 |
| Lovells Lodge Housing Ltd | Real estate | 2026 |
| Lovells Lodge Ltd | Other services | 2026 |
| Lovemill Payroll Ltd | Construction | 2019 |
| Lowdell Group Ltd | Other services | 2019 |
| Lower Herne Developments Limited | Construction | 2017 |
| Lowry Wealth Limited | Real estate | 2025 |
| Loyal Property Ltd | Real estate | 2025 |
| Loyta Ltd | Public administration | 2022 |
| Lperfections Hair and Beauty Ltd | Other services | 2019 |
| LPN Construction Limited | Professional & scientific | 2017 |
| Lptt Limited | Real estate | 2025 |
| LRC Flooring Ltd | Construction | 2016 |
| LRE Carpentry Limited | Construction | 2018 |
| LRS Physiotherapy Ltd | Public administration | 2023 |
| LS DOT Cloud Limited | Information & communication | 2017 |
| LSB Commercial Services Limited | Professional & scientific | 2016 |
| LSG Realisations Limited | Information & communication | 2003 |
| LSL Developments Limited | Construction | 2017 |
| Lstt Logistics Ltd | Professional & scientific | 2014 |
| LSU Transport Limited | Transport & logistics | 2017 |
| LSW Solutions Limited | Financial services | 2012 |
| LT Heating Limited | Manufacturing | 2024 |
| LTB Site Engineering Ltd | Construction | 2023 |
| Lucian Properties (South East) Limited | Real estate | 2010 |
| Luckee Bees Ltd | Wholesale & retail | 2024 |
| Lucy Bloom Ltd | Professional & scientific | 2021 |
| Lucy Stone Psychology Ltd | Education | 2024 |
| Ludos Group Limited | Hospitality | 2017 |
| Lujumo Cleaning Limited | Other services | 2025 |
| Lukasfloor Limited | Construction | 2018 |
| Luke Bland Online Coaching Ltd | Other services | 2024 |
| Lukmar Refurbishments Heating & Plumbing Ltd | Construction | 2021 |
| Lukoma Ltd | Construction | 2017 |
| Lulu Classified ADS Ltd. | Financial services | 2017 |
| Lulu Taxi Ltd | Transport & logistics | 2018 |
| Lumary Limited | Hospitality | 2026 |
| Lumercy Healthcare Ltd | Health & social care | 2013 |
| Lumi Health Ltd | Health & social care | 2025 |
| Luminary Events Limited | Administrative & support | 2024 |
| Lunar Living Ltd | Education | 2021 |
| Lunarae Aesthetics Ltd | Professional & scientific | 2026 |
| Luools Ltd | Professional & scientific | 2015 |
| LUS Holdings Limited | Financial services | 2025 |
| Lustre Consulting Limited | Professional & scientific | 2009 |
| Lustre Group Limited | Financial services | 2019 |
| Luton Arches Tattoo Ltd | Other services | 2018 |
| Luton Hardware Store Limited | Wholesale & retail | 2025 |
| Luton MOT Centre Limited | Wholesale & retail | 2014 |
| LUV Properties Limited | Real estate | 2020 |
| Luxe Connect Ltd | Professional & scientific | 2024 |
| Luxe Dressing Ltd | Wholesale & retail | 2019 |
| Luxe Home Cleaning Company Ltd | Administrative & support | 2025 |
| Luxe Nail Lounge Ltd | Other services | 2023 |
| Luxe Suites Ltd | Real estate | 2023 |
| Luxton's Luxury Lettings Limited | Administrative & support | 2025 |
| Luxury Bars Ltd | Hospitality | 2022 |
| Luxuryandglamevent Ltd | Administrative & support | 2025 |
| Lwinchester Ltd | Professional & scientific | 2023 |
| LXS Consultancy (UK) Limited | Administrative & support | 2014 |
| Lymph Fusion Ltd | Health & social care | 2025 |
| Lyndsay Marion Limited | Wholesale & retail | 2025 |
| Lynx Consultant Limited | Professional & scientific | 2012 |
| Lyrici Arts Limited | Arts & recreation | 2016 |
| Lyueh Ltd | Transport & logistics | 2020 |
| M & E Cooling Limited | Construction | 2018 |
| M & L Paper Limited | Manufacturing | 2005 |
| M & L Recruitment Limited | Administrative & support | 2013 |
| M & L Stevens Limited | Construction | 2004 |
| M & L Stevens Property Limited | Financial services | 2010 |
| M & R Property Investment Ltd | Real estate | 2023 |
| M & S Lane Ltd | Information & communication | 2009 |
| M a Coates Site Services Limited | Construction | 2007 |
| M and N Support Services Limited | Health & social care | 2014 |
| M B (Kent) Developments Limited | Construction | 2021 |
| M Commercial Motor Limited | Wholesale & retail | 2025 |
| M D P Plumbing and Drainage Ltd | Construction | 2015 |
| M Entity Ltd | Information & communication | 2026 |
| M Fisher Electrical Services Ltd | Construction | 2017 |
| M J C (Rochester) Limited | Construction | 2015 |
| M J Pinch Roofing Ltd | Construction | 2017 |
| M J Spicer and Company LLP | | 2002 |
| M K Imaging Services Ltd | Health & social care | 2025 |
| M Shilling Ltd | Wholesale & retail | 2021 |
| M T & SON Limited | Construction | 2006 |
| M T Voice and Data Limited | Information & communication | 2020 |
| M&A Digital Solutions Ltd | Professional & scientific | 2023 |
| M&B Developments London Ltd | Construction | 2019 |
| M&B Properties London Ltd | Construction | 2019 |
| M&C Scrubs Ltd | Administrative & support | 2026 |