| Londonelectricians.Direct Ltd | Construction | 2024 |
| Long Drive Greenford Management Company Limited | Households | 1991 |
| Long HOP Specialists Limited | Real estate | 2024 |
| Longclose Contractors Ltd | Construction | 2021 |
| Longford Cottages Limited | Extraterritorial | 2009 |
| Longford Farms Limited | Agriculture & fishing | 1951 |
| Longford Farms Limited Partnership | | 2021 |
| Longland Enterprises Limited | Information & communication | 1971 |
| Longleaze Management Company Limited | Households | 2013 |
| Longside Lane Management Company Ltd | Real estate | 2015 |
| Loop Architects Limited | Professional & scientific | 2021 |
| Loop Pilates Limited | Arts & recreation | 2025 |
| Lord Roberts Mews Management Limited | Households | 1983 |
| Lostwithiel Investments Limited | Wholesale & retail | 2002 |
| Lotmore Events Ltd | Administrative & support | 2023 |
| Lotus 8 Ltd | Hospitality | 2018 |
| Loudham Estates (Suffolk) Limited | Agriculture & fishing | 1965 |
| Louella Lettings Limited | Households | 2021 |
| Louisa Lewis Ltd | Administrative & support | 2012 |
| Louise Luton Creative Ltd | Arts & recreation | 2021 |
| Love Landscaping Limited | Other services | 2024 |
| Lovel's Farm (Facilities Management) Limited | Households | 2018 |
| Loveleigh Aesthetics Ltd | Other services | 2025 |
| Lower Pertwood Organic Farm Limited | Agriculture & fishing | 1958 |
| Lowicks Community Ltd | Wholesale & retail | 2023 |
| Loxley Contracting Ltd | Construction | 2025 |
| LP Excavations Limited | Construction | 2025 |
| Lppubgroup Limited | Financial services | 2026 |
| Lrcw Property Limited | Real estate | 2026 |
| LRG Consulting Limited | Professional & scientific | 2022 |
| LS Accounts Limited | Professional & scientific | 2003 |
| LSE Building Preservation Ltd | Construction | 2000 |
| Lspc Limited | Other services | 2025 |
| Lstg Limited | Hospitality | 2019 |
| LT Cocking Ltd | Hospitality | 2024 |
| Lt&C Properties Limited | Real estate | 2025 |
| Lucari Group Ltd | Professional & scientific | 2026 |
| Lucas and SON Developments Limited | Construction | 2012 |
| Lucky 7’S Trading Co Ltd | Wholesale & retail | 2025 |
| Lucky FU Asiamart Ltd | Wholesale & retail | 2025 |
| Lucky Leads Limited | Wholesale & retail | 2020 |
| Ludlow Construction Ltd | Construction | 2018 |
| Ludlow Developments Ltd. | Construction | 1998 |
| Ludlow Holiday Cottages Limited | Hospitality | 2022 |
| Ludlow Projects Limited | Construction | 2021 |
| Ludlow Properties Limited | Construction | 2020 |
| Ludlow Property Limited | Extraterritorial | 2019 |
| Luke Anson Automotive Ltd | Wholesale & retail | 2025 |
| Luke Pullen Racing Limited | Arts & recreation | 2020 |
| Lumbini Mini Mart Ltd | Wholesale & retail | 2025 |
| Lumotics Limited | Manufacturing | 2016 |
| Luro Properties Ltd | Real estate | 2023 |
| Luxline Reserve Ltd | Administrative & support | 2025 |
| Luxury Nail Bar 9199 Ltd | Other services | 2025 |
| Luxury Nails (Salisbury) Limited | Other services | 2018 |
| Luxus Candles Ltd | Manufacturing | 2022 |
| Lvce Properties Limited | Real estate | 2025 |
| Lwrk Ltd | Wholesale & retail | 2026 |
| LXP Accounting Ltd | Professional & scientific | 2025 |
| Lydia Trading Ltd | Wholesale & retail | 2026 |
| Lyknn Limited | Arts & recreation | 2021 |
| Lyle Place (Bury ST Edmunds) Management Company Limited | Households | 2020 |
| Lyme Business Support Limited | Professional & scientific | 2014 |
| Lyndhurst Plastic Fabrication Limited | Manufacturing | 2006 |
| Lyness & Nicolle Building Contractor Limited | Construction | 2024 |
| Lyness & Nicolle Properties Limited | Real estate | 2025 |
| Lynx EOT Trustee Limited | Administrative & support | 2022 |
| Lynx Visuals Limited | Professional & scientific | 2024 |
| Lysons & Sons Holdings Limited | Financial services | 2025 |
| Lytchett Minster Joinery Ltd | Manufacturing | 2011 |
| Lywood Close (Salisbury) Limited | Households | 2019 |
| M & a Holdings South Limited | Financial services | 2023 |
| M & a Investment Property Limited | Real estate | 2019 |
| M & D Woodcraft Limited | Manufacturing | 2021 |
| M & M Auto Engineers Limited | Wholesale & retail | 2013 |
| M & M Design & Metalwork Limited | Administrative & support | 2008 |
| M & N Cash and Carry Ltd | Hospitality | 2010 |
| M & P Plant Hire Ltd | Administrative & support | 2007 |
| M a C Eyewear Limited | Wholesale & retail | 2009 |
| M a Vans Limited | Wholesale & retail | 2017 |
| M and S Dairy Farmers Limited | Administrative & support | 2016 |
| M G Property Salisbury Limited | Extraterritorial | 2019 |
| M Hunter Investigative & Legal Services Limited | Extraterritorial | 2016 |
| M W Adams (Southern) Limited | Construction | 2016 |
| M&K Adventures Ltd | Health & social care | 2015 |
| M&Kh Ltd | Professional & scientific | 2021 |
| M&M Inc. Ltd | Health & social care | 2019 |
| M&N Gentle Care Ltd | Financial services | 2023 |
| M. Power Tools Limited | Manufacturing | 1994 |
| M.Allen Building Contractors Ltd | Construction | 2016 |
| M.C. Griffiths (Automobile Components) Limited | Financial services | 1981 |
| M.C. Zeck Limited | Health & social care | 2011 |
| M.I. Hazzard & Sons Limited | Construction | 2005 |
| M.J. Abbott Holdings Limited | Financial services | 2020 |
| M.J. Abbott Limited | Manufacturing | 1985 |
| M.R. Tutoring Ltd | Education | 2026 |
| M.R.A Technical Services Ltd | Construction | 2018 |
| M.W.Duckett Limited | Wholesale & retail | 2010 |
| MA Golf Superstore Ltd | Wholesale & retail | 2024 |
| MAC an Tsaoir & Sons Limited | Professional & scientific | 2013 |