| Little Gems Fleet Ltd | Education | 2025 |
| Little Gorkha Ltd | Wholesale & retail | 2020 |
| Little Kickers Southfields & Earlsfield LLP | | 2022 |
| Little Roots Ltd | Hospitality | 2025 |
| Littlegemsaldershot Ltd | Education | 2018 |
| Live Well Coaching Ltd | Education | 2019 |
| LJS Project Management Limited | Professional & scientific | 2013 |
| LKR Productions Limited | Information & communication | 2025 |
| LLB Automotive Limited | Wholesale & retail | 2021 |
| Lloyd Cole Limited | Administrative & support | 2016 |
| Lloyd Jones Plumbing & Heating Ltd | Construction | 2026 |
| LN Cleaning Ltd | Administrative & support | 2024 |
| Loddon Door Services Limited | Manufacturing | 1994 |
| Logical Fulfilment Limited | Transport & logistics | 2013 |
| Lokiga Limited | Wholesale & retail | 2023 |
| Lolinka Beauty Clinic Limited | Other services | 2024 |
| Lomo Steakhouse Limited | Hospitality | 2025 |
| London Cine EYE Limited | Information & communication | 2015 |
| London Coaching Development Ltd | Professional & scientific | 2026 |
| London Elite Shopper Ltd | Wholesale & retail | 2026 |
| London Epoxy Floors Ltd | Construction | 2025 |
| London Fire Associates Ltd | Public administration | 2022 |
| London Gurkha Ltd | Wholesale & retail | 2019 |
| London MAX Ltd | Wholesale & retail | 2019 |
| London Maxillofacial Surgery Limited | Health & social care | 2021 |
| London Prestige Autos Ltd | Wholesale & retail | 2025 |
| London Private Tours Ltd | Administrative & support | 2008 |
| London Road Property Ltd | Real estate | 2026 |
| Lord Property Limited | Real estate | 2025 |
| Lorne Villas Associates 2-4 Queens Road Ltd | Households | 2017 |
| Lotus Jewellers Ltd | Manufacturing | 2025 |
| Loudmouth Communications Ltd | Information & communication | 2023 |
| Louise Minilo Ltd | Wholesale & retail | 2025 |
| Lovell’S Transport Ltd | Transport & logistics | 2025 |
| Lowe Maintenance Ltd | Manufacturing | 2019 |
| Lowell&Leroy Limited | Health & social care | 2018 |
| Lowman Heating Services Ltd | Construction | 2023 |
| Lsmg Sound & Lighting Services Ltd. | Administrative & support | 2020 |
| LT Mechanical Solutions Ltd | Construction | 2018 |
| LTS Stone Ltd | Construction | 2020 |
| Lucky Truck Limited | Transport & logistics | 2025 |
| Ludology Events Ltd | Administrative & support | 2025 |
| LUK Catering Ltd | Hospitality | 2025 |
| Luka’S Allday Ltd | Manufacturing | 2026 |
| Luke Barney Food Catering Ltd | Hospitality | 2025 |
| Lumbini Store UK Ltd | Wholesale & retail | 2022 |
| Luna & Coast Apothecary Ltd | Wholesale & retail | 2025 |
| Luna & Coast Ltd | Wholesale & retail | 2025 |
| Luna Apothecary Ltd | Wholesale & retail | 2024 |
| Luna Craft Studio Ltd | Wholesale & retail | 2024 |
| Luna PVT Ltd | Wholesale & retail | 2022 |
| Luxe Landscaping and Construction Ltd | Construction | 2026 |
| Luxera Brand PVT Ltd | Wholesale & retail | 2026 |
| Luxline Car Rentals Limited | Administrative & support | 2025 |
| Lynnda Ltd | Health & social care | 2024 |
| Lyons Lair Limited | Real estate | 2023 |
| Lyris Group Ltd | Information & communication | 2020 |
| M & a @ Willow Park Ltd | Agriculture & fishing | 2017 |
| M & D Consultancy for Students Limited | Education | 2015 |
| M & D Tabbener Ltd | Arts & recreation | 2013 |
| M & R Ceramic Tiling Ltd | Construction | 2015 |
| M & T International Ltd | Transport & logistics | 2022 |
| M Bhalli Limited | Wholesale & retail | 2025 |
| M&J Traders Limited | Wholesale & retail | 2016 |
| M&N Offshore Ltd | Professional & scientific | 2024 |
| M. F. Agency Limited | Other services | 2017 |
| M.A.J Group Holdings Ltd | Information & communication | 2024 |
| M.B.S. Mobile Bar Services Limited | Hospitality | 1993 |
| M2R Services Ltd | Wholesale & retail | 2025 |
| MA Mandyce Logistics Ltd | Transport & logistics | 2024 |
| MA Mia's Ltd | Hospitality | 2020 |
| Maan Services Limited | Administrative & support | 2022 |
| Macdrive Ltd | Transport & logistics | 2023 |
| MAD Alloys Ltd | Wholesale & retail | 2023 |
| MAD FX Ltd | Arts & recreation | 2022 |
| Madeleine Creative Ltd | Hospitality | 2026 |
| Magic Plumbing & Heating Ltd | Construction | 2024 |
| Magirex Ltd | Wholesale & retail | 2020 |
| Magnum Plumbing & Heating Supplies Limited | Wholesale & retail | 1976 |
| Magtech IT Ltd | Information & communication | 2025 |
| Maharani Trails Limited | Real estate | 2025 |
| Mahavira Limited | Hospitality | 2026 |
| Maida Health Community Interest Company | Health & social care | 2025 |
| Maida Safety Services Ltd | Professional & scientific | 2016 |
| Mainali Brothers Limited | Wholesale & retail | 2025 |
| Mairav Collections Ltd | Wholesale & retail | 2025 |
| Majestic Manor Group Ltd | Real estate | 2025 |
| Major Noor Ltd | Wholesale & retail | 2022 |
| Majorz Services Ltd | Transport & logistics | 2026 |
| Makalu Property Limited | Real estate | 2025 |
| Malinggo UK Ltd | Hospitality | 2025 |
| Malla Enterprises Ltd | Real estate | 2021 |
| Mamas Trini Kitchen Ltd | Hospitality | 2021 |
| Manawey Bodyworks Limited | Wholesale & retail | 2014 |
| Manbi Limited | Real estate | 2025 |
| Mandcehm Limited | Health & social care | 2018 |
| Mandozai Construction Ltd | Construction | 2018 |
| Mandozai Properties Ltd | Real estate | 2017 |
| Mandycelogistics Ltd | Transport & logistics | 2025 |
| Manna Investment Group Limited | Hospitality | 2025 |