| Long Xiang Ltd | Manufacturing | 2020 |
| Longyi Industrial Co., Ltd. | Extraterritorial | 2019 |
| Look & BOW Limited | Wholesale & retail | 2020 |
| Loop Properties Ltd | Real estate | 2017 |
| Lords Real Estate Ltd | Real estate | 2018 |
| Lotta Estates Limited | Real estate | 2024 |
| Lotus Event Supplies International Limited | Arts & recreation | 2019 |
| Lourdes RL (UK) Ltd | Wholesale & retail | 2018 |
| Love Spa Ltd | Other services | 2024 |
| Love Your Builder Limited | Construction | 2019 |
| Loveday Associates Ltd | Real estate | 2021 |
| Lovespice Ltd. | Extraterritorial | 2020 |
| Loyale Beauty Ltd | Other services | 2020 |
| LP Pathways Limited | Professional & scientific | 2022 |
| LPA Property Services Limited | Real estate | 2023 |
| LPC Building & Designs Limited | Construction | 2022 |
| Lpnh (Holdings) Ltd | Professional & scientific | 2021 |
| LR Logistic Services Limited | Transport & logistics | 2026 |
| LR Removals and Disposal Services Ltd | Transport & logistics | 2023 |
| LRT Solutions Ltd | Information & communication | 2018 |
| LSB Surfacing Limited | Administrative & support | 2024 |
| LSK Property Ltd | Real estate | 2014 |
| LSR Joinery Ltd | Manufacturing | 2020 |
| LT Building Developments Ltd | Real estate | 2025 |
| Ltjr Limited | Arts & recreation | 2021 |
| LTR Consultancy Ltd | Information & communication | 2020 |
| Lucas Film & TV Ltd | Information & communication | 2019 |
| Lucky 7 Barbers Limited | Other services | 2021 |
| Lufe Ltd | Construction | 2023 |
| Luigi Auto Care (UK) Ltd | Wholesale & retail | 2002 |
| Luke Savage Consulting Ltd | Professional & scientific | 2024 |
| Luminicious Ltd | Wholesale & retail | 2017 |
| Luminous Beauty Ltd | Other services | 2023 |
| Luna Property Investments Ltd | Real estate | 2015 |
| Lunar Beagle Limited | Manufacturing | 2017 |
| Lungdiagnosis AKA Limited | Health & social care | 2022 |
| Lustreplace Limited | Hospitality | 1986 |
| Luvbubbles Ltd | Manufacturing | 2023 |
| Luvlust London Limited | Manufacturing | 2014 |
| LUX Nails 20 Ltd | Other services | 2024 |
| Luxe Brush Ltd | Construction | 2024 |
| Luxent Limited | Wholesale & retail | 2023 |
| Luxewatch Hire & Trade Ltd | Wholesale & retail | 2026 |
| Luxvia Limited | Wholesale & retail | 2025 |
| LVS Consultancy UK Limited | Administrative & support | 2016 |
| Lyall Clothing Ltd | Wholesale & retail | 2026 |
| Lyberty Consulting Limited | Construction | 2020 |
| Lynton & Mead Solicitors Limited | Professional & scientific | 2021 |
| Lynx Trader Limited | Professional & scientific | 2019 |
| L’Inverno (Film) English Productions Limited 11456948 Ltd | Information & communication | 2020 |
| M & a Sports Berks Ltd | Arts & recreation | 2022 |
| M & a Sports SWL Ltd | Arts & recreation | 2022 |
| M & B Consulting Limited | Professional & scientific | 2003 |
| M & N Bajwa Lettings Ltd | Real estate | 2020 |
| M & S Capital LLP | | 2018 |
| M Ashton Accountants Limited | Professional & scientific | 2016 |
| M Ashton Properties Limited | Real estate | 2019 |
| M Cotter & Sons Limited | Construction | 2007 |
| M E M Services Limited | Construction | 1984 |
| M G D Electrical Services Limited | Construction | 2006 |
| M G Roofing & Building Limited | Construction | 2014 |
| M H a Business Consulting Services Ltd | Wholesale & retail | 2024 |
| M Hirani Estates Ltd | Real estate | 2022 |
| M Hirani Limited | Professional & scientific | 2019 |
| M J L Contracts Limited | Agriculture & fishing | 2008 |
| M J N Properties Limited | Real estate | 2014 |
| M J Newton Electrical Contractors Limited | Construction | 1998 |
| M J Sweeney Ltd | Information & communication | 2017 |
| M K Roofing & Home Improvements Limited | Construction | 2021 |
| M Mccarthy Roofing Specialists Limited | Construction | 2023 |
| M Motor Services Ltd | Wholesale & retail | 2007 |
| M O'Donnell Plumbing & Heating Limited | Construction | 2017 |
| M&A Images & Film Limited | Professional & scientific | 2013 |
| M&G Enterprises Limited | Wholesale & retail | 2012 |
| M&M Drives and Patios Limited | Administrative & support | 2021 |
| M&M Electrical (England) Ltd | Construction | 2020 |
| M&N Ventures Ltd | Real estate | 2024 |
| M&R Wenman Developments Ltd | Real estate | 2021 |
| M&S Prime Estates Ltd | Real estate | 2015 |
| M&S Solutions Private Limited | Wholesale & retail | 2022 |
| M&S UK Property Ltd | Real estate | 2016 |
| M-Fix Construction Ltd | Construction | 2019 |
| M.P. Motors (Rental) Limited | Administrative & support | 2002 |
| M3G Homes Limited | Real estate | 2020 |
| M3G Lettings Limited | Real estate | 2025 |
| M3G Partners Limited | Real estate | 2025 |
| M3G Solutions Limited | Information & communication | 2007 |
| M4KE Time Ltd | Wholesale & retail | 2025 |
| MA Online Shop Ltd | Wholesale & retail | 2020 |
| MA8 Limited | Wholesale & retail | 2024 |
| MAC and Phone FIX London Limited | Wholesale & retail | 2020 |
| MAC Solution London Ltd | Other services | 2020 |
| MAC Xpress Ltd | Transport & logistics | 2023 |
| Machbrook Limited | Wholesale & retail | 1987 |
| Macnairs Accountancy Solutions Limited | Professional & scientific | 2013 |
| Macnairs Limited | Professional & scientific | 2013 |
| Mage Property Solutions Ltd | Real estate | 2019 |
| Maggies Boutique Ltd | Wholesale & retail | 2010 |
| Maghoo Creatives Ltd | Wholesale & retail | 2011 |
| Maghoo Property Holdings Ltd | Financial services | 2024 |