| Luna Blue Ltd | Professional & scientific | 2019 |
| Luna CBK Ltd | Professional & scientific | 2015 |
| Luna Club Limited | Arts & recreation | 2025 |
| Luna Red Limited | Construction | 2019 |
| Lunar Stretch Tents Ltd | Administrative & support | 2022 |
| Lune Scape Limited | Wholesale & retail | 2021 |
| Lupa Pizza Limited | Hospitality | 2024 |
| Lupa UK Limited | Wholesale & retail | 2015 |
| Lureyno HR Limited | Administrative & support | 2014 |
| Lush Beauty Academy Ltd | Education | 2024 |
| Lush Homeware Ltd | Wholesale & retail | 2022 |
| Lush Leisure Vehicles Ltd | Wholesale & retail | 2020 |
| Lusiad Search Limited | Administrative & support | 2025 |
| Lusso Holdings Ltd | Financial services | 2015 |
| Lustre Coatings (Norfolk) Limited | Construction | 2014 |
| Lustre Coatings Limited | Construction | 1988 |
| Luton Pool Centre Ltd | Other services | 2017 |
| Lutro Group Ltd | Professional & scientific | 2025 |
| LUX Car Rental Ltd | Other services | 2018 |
| Luxborough Tower (LS) Limited | Real estate | 2022 |
| Luxe Beauty Norfolk Ltd | Other services | 2023 |
| Luxe Cosmetic Clinic Ltd | Administrative & support | 2021 |
| Luxe LET Living Ltd | Hospitality | 2026 |
| Luxe Living & Lettings Ltd | Real estate | 2025 |
| Luxe Studio Aesthetics Ltd | Other services | 2020 |
| Luxe Tanning Limited | Other services | 2024 |
| Luxe View Blinds Ltd | Manufacturing | 2025 |
| Luxifyr Ltd | Wholesale & retail | 2023 |
| Luxsule Limited | Administrative & support | 2025 |
| Luxury Barber Norwich Ltd | Other services | 2024 |
| Luxury City Lets Ltd | Real estate | 2020 |
| Luxury Marine Ltd | Wholesale & retail | 2013 |
| Luzai Ltd | Information & communication | 2025 |
| LV Fleet & Co. Ltd | Wholesale & retail | 2026 |
| LV Select Ltd | Wholesale & retail | 2026 |
| Lwadvisory Limited | Professional & scientific | 2011 |
| Lwjr Barbering Limited | Other services | 2026 |
| LWU Ltd | Administrative & support | 2011 |
| LX Cars Ltd | Wholesale & retail | 2025 |
| Lxryspace Ltd | Financial services | 2025 |
| LXT International Ltd | Wholesale & retail | 2022 |
| Lyahya Ltd | Health & social care | 2023 |
| Lycah Properties Ltd | Financial services | 2025 |
| Lyd's Posh Dogs Ltd | Professional & scientific | 2017 |
| Lydney Maintenance Ltd | Households | 2014 |
| Lyhart Limited | Households | 2023 |
| Lympstone Ltd | Professional & scientific | 2026 |
| Lyndon SET Design Limited | Arts & recreation | 2018 |
| Lyng Stores Ltd | Wholesale & retail | 2018 |
| Lyngate Court Residents Association Limited | Households | 1981 |
| Lynn Mcgarry HR Limited | Administrative & support | 2023 |
| Lynn's PUB Ltd | Hospitality | 2007 |
| Lynsey&Leescreations Ltd | Wholesale & retail | 2024 |
| Lynx POS Limited | Professional & scientific | 2001 |
| Lynxnode Ventures Limited | Information & communication | 2024 |
| Lyon C T P Limited | Professional & scientific | 2014 |
| Lyub IT Ltd | Information & communication | 2024 |
| Lyuba Construction Ltd | Construction | 2024 |
| M & C Scott Limited | Wholesale & retail | 2002 |
| M & G Bars Limited | Hospitality | 2020 |
| M & H Property Holdings Ltd | Real estate | 2016 |
| M & J Consultancy Limited | Information & communication | 2018 |
| M & K (UK) Ltd | Administrative & support | 2001 |
| M & K Steel Properties Ltd | Real estate | 2014 |
| M & L Services (Anglia) LLP | | 2008 |
| M & M Accounting (Norfolk) Ltd | Professional & scientific | 2025 |
| M & M Aesthetics Ltd | Other services | 2021 |
| M & M Bars (Norfolk) Ltd | Hospitality | 2016 |
| M & M Builders (Norfolk) Limited | Construction | 2002 |
| M & M Flooring Specialists Limited | Construction | 2009 |
| M & M Leisure Centre (Haverhill) Limited | Wholesale & retail | 1999 |
| M & M Multimedia Group Limited | Arts & recreation | 2007 |
| M & R (Norwich) Ltd | Professional & scientific | 2016 |
| M & R Creative Designs Limited | Information & communication | 2014 |
| M & S Builders (Bury) Limited | Construction | 2006 |
| M & S Climate Solutions Ltd | Construction | 2016 |
| M & S Consultancy Serv's Limited | Professional & scientific | 2016 |
| M & Sons Estate Ltd | Wholesale & retail | 2025 |
| M a Bailey Limited | Construction | 2007 |
| M a Mortgages Limited | Financial services | 2016 |
| M a Pitcher Builders Ltd | Construction | 2012 |
| M a Rahman Ltd | Wholesale & retail | 2006 |
| M a Sharif (Fruit & VEG) Limited | Wholesale & retail | 2000 |
| M a Whiteley Limited | Information & communication | 2021 |
| M and G Multi Services Limited | Wholesale & retail | 2006 |
| M B Sarson Limited | Real estate | 2011 |
| M Brands Two Ltd | Hospitality | 2023 |
| M Burrows Services Ltd | Professional & scientific | 2025 |
| M Carse Holdings Ltd | Financial services | 2021 |
| M Construct London Ltd | Construction | 2016 |
| M Construction Services Ltd | Construction | 2016 |
| M Cook PLS Limited | Health & social care | 2009 |
| M Culling Mechanical Services Limited | Construction | 2003 |
| M D Developments (Norfolk) Limited | Construction | 2024 |
| M D Fire Solutions Ltd | Construction | 2012 |
| M D Thompson Electrical Wholesalers Limited | Wholesale & retail | 1993 |
| M E Bowker Limited | Financial services | 2021 |
| M E Irrigation Ltd | Construction | 2024 |
| M E Rail Engineering Limited | Professional & scientific | 2020 |
| M Elders Ltd | Construction | 2014 |