| Legend Buffet Ltd | Hospitality | 2026 |
| Leonard Mcsweeney Limited | Financial services | 2021 |
| Levelchain Limited | | 1986 |
| Levels Boxing Ltd | Manufacturing | 2024 |
| Lewis Engineering Contractors Limited | Manufacturing | 2011 |
| Lewisjmedia Ltd | Professional & scientific | 2025 |
| Lexeo Ltd | Education | 2023 |
| Lggifts Ltd | Wholesale & retail | 2026 |
| LGS Bajwa Property Ltd | Real estate | 2026 |
| LH Carpentry and Building Ltd | Manufacturing | 2026 |
| LHJ Installations Limited | Manufacturing | 2017 |
| Liams Foals Ltd | Agriculture & fishing | 2025 |
| LINCHEN168PROPERTY Limited | Real estate | 2023 |
| Linguanest Limited | Information & communication | 2026 |
| Lisa Price Financial Services Limited | Financial services | 2018 |
| Little Mill Services Limited | Construction | 1999 |
| Little Titans Childcare Ltd | Education | 2021 |
| Little TON Lands Limited | Real estate | 2023 |
| Lizzy's Cafe Limited | Hospitality | 2015 |
| Ljarvis Ltd | Construction | 2022 |
| LJM Building & Maintenance Ltd | Construction | 2026 |
| LJR Commercial Trading Limited | Other services | 2010 |
| Llanyrafon Manor CIC | Hospitality | 2025 |
| Llanyrafon Manor Farm Ltd | Hospitality | 2024 |
| Llanyravon Community Golf Course Ltd | Arts & recreation | 2023 |
| Llew Financial Services Ltd | Administrative & support | 2017 |
| Llewellyns Garage (Blackwood) Limited | Wholesale & retail | 1998 |
| LLL Holdings Limited | Financial services | 2025 |
| LMB Plumbing & Heating Limited | Construction | 2025 |
| LMJ Interiors Ltd | Construction | 2026 |
| Lollipops & Ladybirds Ltd | Manufacturing | 2013 |
| Longs Hospitality Ltd | Hospitality | 2026 |
| Lotus Aesthetic Ltd | Other services | 2025 |
| Love ME 365 Ltd | Wholesale & retail | 2025 |
| Lower Skenchill Farm Ltd | Hospitality | 2022 |
| LQ Parkway Hotel & Spa Limited | Hospitality | 2024 |
| LST Trading Ltd | Wholesale & retail | 2022 |
| LT Tools Ltd | Wholesale & retail | 2021 |
| Ltvp Ltd | Professional & scientific | 2024 |
| Luke Cantonese Takeaway Limited | Hospitality | 2019 |
| LUX Kurdish Barber Ltd | Other services | 2023 |
| LUX Nails Studio Ltd | Other services | 2020 |
| M & N Motor Services (Pontypool) Limited | Extraterritorial | 2014 |
| M and N Breakthrough Limited | Wholesale & retail | 2025 |
| M R Tunley Electrical Limited | Construction | 2007 |
| M Shave Property Investments Ltd | Real estate | 2025 |
| M&B Property Solutions Ltd | Real estate | 2017 |
| M. Hall Associates Limited | Manufacturing | 2004 |
| M.B.J Services Ltd | Construction | 2015 |
| M.G's Carpets, Rugs & Blinds Ltd | Wholesale & retail | 2026 |
| Maahi Retail Ltd | Wholesale & retail | 2020 |
| Macnet Solutions Limited | Information & communication | 2021 |
| MAD Merch Ltd | Wholesale & retail | 2022 |
| Madame Fromage Catering Limited | Hospitality | 2017 |
| Madok Coffee Limited | Wholesale & retail | 2024 |
| Maesgwyn Holdings Limited | Agriculture & fishing | 2017 |
| Magg Properties Limited | Real estate | 2020 |
| Maggs and Gunter Ltd | Real estate | 2018 |
| MAK SUB Ltd | Hospitality | 2019 |
| Malvern Hills Physiotherapy Limited | Other services | 2015 |
| Management Company for 11GR Limited | Households | 2021 |
| Manorbier Four Limited | Households | 2022 |
| Maple 1985 Limited | Hospitality | 2026 |
| Marble Arch Building Supplies Limited | Wholesale & retail | 1996 |
| Marina Frank Ltd | Wholesale & retail | 2021 |
| Mario Antonio & Co Ltd | Information & communication | 2024 |
| Marius-Absolut Limited | Transport & logistics | 2021 |
| Mark Chudley Limited | Extraterritorial | 2000 |
| Mark Jude Floors Limited | Construction | 2006 |
| Marleys Kitchen and Grill Ltd | Hospitality | 2024 |
| Marshall Frances Ltd | Wholesale & retail | 2025 |
| Masala Bazaar Bristol Ltd | Wholesale & retail | 2017 |
| Masala Bazaar Cardiff Ltd | Wholesale & retail | 2019 |
| Masala Bazaar Chadwell Ltd | Wholesale & retail | 2021 |
| Masala Bazaar Greenwich Ltd | Wholesale & retail | 2026 |
| Masala Bazaar Hadfield Ltd | Wholesale & retail | 2021 |
| Masala Bazaar Holdings Ltd | Wholesale & retail | 2019 |
| Masala Bazaar Limited | Wholesale & retail | 2003 |
| Masala Bazaar Luton Ltd | Wholesale & retail | 2026 |
| Masala Bazaar Newport Ltd | Wholesale & retail | 2017 |
| Masala Bazaar Perry Barr Ltd | Wholesale & retail | 2021 |
| Masala Bazaar Small Heath Ltd | Wholesale & retail | 2021 |
| Masala Bazaar Smethwick Ltd | Wholesale & retail | 2017 |
| Masala Bazaar Swansea Ltd | Wholesale & retail | 2019 |
| Masala Bazaar Swindon Ltd | Wholesale & retail | 2017 |
| Matjon Limited | Real estate | 2023 |
| Matt Ballam Limited | Real estate | 2024 |
| Matthew DM Lewis Ltd | Agriculture & fishing | 2023 |
| Mawby Digital Ltd | Professional & scientific | 2022 |
| MB Electrical Supplies Ltd | Wholesale & retail | 2012 |
| MBC Carpentry and Building Services Ltd | Construction | 2021 |
| MBJ Trading Limited | Administrative & support | 2023 |
| Mc-Ind-Compliance Limited | Manufacturing | 2026 |
| Mcandrew Planning Ltd | Professional & scientific | 2024 |
| ME Electrical Contractors Limited | Construction | 2018 |
| Me.Beauty Ltd | Other services | 2020 |
| Medalclass Limited | Arts & recreation | 1992 |
| MEDS4PETS Ltd | Professional & scientific | 2025 |
| Mehdi&Sons Ltd | Wholesale & retail | 2026 |
| MEI XIN Trading Limited | Hospitality | 2025 |