| Life Designs Ltd | Construction | 2007 |
| Lifestyle Contracts Ltd | Construction | 2008 |
| Lime Hause Ltd | Construction | 2025 |
| Limewood Interiors Limited | Professional & scientific | 2021 |
| Lisney Pantry Ltd | Hospitality | 2022 |
| Little Willow Tree Ltd | Health & social care | 2024 |
| LIVE4TENNIS LLP | | 2020 |
| Lken Ltd | Wholesale & retail | 2016 |
| LKW Heating & Plumbing Limited | Construction | 2026 |
| Llevante Ltd | Other services | 2025 |
| Lochinvar Care Limited | Other services | 2005 |
| Logos Structural Limited | Professional & scientific | 2025 |
| Louisa Spicer HR Consultancy Ltd | Administrative & support | 2019 |
| LOVE4DOGS Rescue Ltd | Other services | 2026 |
| LSG Property Solutions Ltd | Real estate | 2026 |
| Lumine Development Ltd | Professional & scientific | 2011 |
| M J J Plastering Limited | Construction | 2018 |
| M W F a Ltd | Wholesale & retail | 2012 |
| Maclachlan Solicitors Limited | Professional & scientific | 2011 |
| MAD4ANIMALS Ltd | Education | 2022 |
| Maidment & Carter Limited | Construction | 2003 |
| Malcolm Francis Services Limited | Construction | 2021 |
| Malthouse Court (Frome) Limited | Households | 1989 |
| Marine Antiques Ltd. | Wholesale & retail | 2017 |
| Marleymoves Ltd | Transport & logistics | 2024 |
| Marlow Worldwide Yacht Charters Ltd. | Transport & logistics | 2016 |
| Marston Park Estate Limited | Agriculture & fishing | 2004 |
| Marvel Bookkeeping Ltd | Professional & scientific | 2019 |
| Mastermind Security Solutions Limited | Wholesale & retail | 2021 |
| Mateusz Auto Repairs Limited | Wholesale & retail | 2025 |
| Matrix Seating Limited | Manufacturing | 2002 |
| Mayas Tea & Co. Limited | Hospitality | 2022 |
| Mblw Limited | Financial services | 2025 |
| Mclean & Sons Ltd | Agriculture & fishing | 2009 |
| Mclean Holdings Ltd | Professional & scientific | 2019 |
| Medibreak Limited | Administrative & support | 2025 |
| Meditech Systems Ltd. | Manufacturing | 1996 |
| Mehers Ltd | Wholesale & retail | 2020 |
| Melbury Search Ltd. | Administrative & support | 2015 |
| Melbury Vale Company Ltd | Arts & recreation | 2014 |
| Melbury Vehicle Service Ltd | Wholesale & retail | 2022 |
| Merley Commercial Limited | Real estate | 2021 |
| Merley Limited | Wholesale & retail | 2013 |
| Mesh Developments Ltd | Real estate | 2016 |
| Middle England Estates Limited | Administrative & support | 1995 |
| Mike Bowden and Sons Limited | Construction | 2020 |
| Miljam Properties (Kennington) Limited | Real estate | 1998 |
| Mill Hollow Events Ltd | Other services | 2023 |
| Mindful Solace Ltd | Health & social care | 2015 |
| Molrose Properties Limited | Real estate | 2024 |
| Moore and Stranger Limited | Real estate | 2023 |
| Morgan & Marx Ltd | Wholesale & retail | 2018 |
| Mornington Slade Limited | Information & communication | 2018 |
| Motatec Limited | Wholesale & retail | 2009 |
| Motoglide Ltd | Manufacturing | 2015 |
| MPB Building Contractors Limited | Construction | 2002 |
| MR & MRS J D Parsons, S J Parsons & Miss J N Parsons | | 2003 |
| Mrch Ltd | Wholesale & retail | 2010 |
| MUD and Rock Ltd | Wholesale & retail | 2023 |
| Mulberry Interactive Limited | Information & communication | 2006 |
| MV Magna Carta Ltd | Transport & logistics | 2021 |
| MW Properties Ltd | Real estate | 2013 |
| My Move Portal Limited | Real estate | 2025 |
| My Three Rocks Ltd | Hospitality | 2024 |
| Mylarch Consulting Ltd | Health & social care | 2026 |
| N D Hardiman Haulage Limited | Transport & logistics | 1995 |
| Nancy Sexton Ltd | Professional & scientific | 2015 |
| NAS Group Limited | Financial services | 2020 |
| Nativlo Ltd | Education | 2025 |
| Natural High Safaris Limited | Administrative & support | 2002 |
| Ncsct Community Interest Company | Health & social care | 2010 |
| NDM Electrical Contractors Ltd | Construction | 2019 |
| Ndrive UK Ltd | Transport & logistics | 2026 |
| Neigh & Nicker Ltd | Wholesale & retail | 2023 |
| Nejara Pubs and Properties Limited | Hospitality | 2019 |
| Nells Archdale Ltd | Arts & recreation | 2021 |
| Netstone IT Limited | Information & communication | 2023 |
| Neurosense Limited | Extraterritorial | 1999 |
| Nevidomska Ltd | Wholesale & retail | 2019 |
| New Horizon Gymnastics Ltd | Arts & recreation | 2026 |
| New Leaf Building and Home Improvements Limited | Manufacturing | 2025 |
| Newbury Electronic Services Limited | Manufacturing | 1999 |
| Nexus Optimize Limited | Professional & scientific | 2026 |
| Nicholls Electrical and Solar Ltd | Construction | 2023 |
| Nicky Arundell Ltd | Other services | 2024 |
| Nigel Marsh Consultancy Limited | Administrative & support | 2018 |
| Niwaki Holdings Ltd | Financial services | 2022 |
| Niwaki Ltd | Wholesale & retail | 2007 |
| NO More Bamboo Ltd | Administrative & support | 2025 |
| NO More Stumps Ltd | Agriculture & fishing | 2017 |
| North & EVE Limited | Wholesale & retail | 2025 |
| Notus Events Limited | Administrative & support | 2023 |
| Number Sense Limited | Professional & scientific | 2012 |
| OEC Limited | Professional & scientific | 2019 |
| Omega Parts Limited | Wholesale & retail | 2019 |
| Omnis Mechanical Limited | Manufacturing | 1999 |
| Onyx Civils Ltd | Construction | 2015 |
| Oodal Ltd | Information & communication | 2018 |
| Open Your Senses Ltd | Wholesale & retail | 2026 |
| Orchard Mews Management Company (Dorset) Ltd | Households | 2021 |