| Love to B Skincare Ltd | Manufacturing | 2012 |
| Love&More Limited | Wholesale & retail | 2025 |
| Lovelady Carpentry Ltd | Manufacturing | 2024 |
| Lovely Jubbly Property Limited | Professional & scientific | 2024 |
| LOW Carbon Energy Centre Limited | Construction | 2010 |
| LOW Cost Motivators Limited | Professional & scientific | 2013 |
| Lower Westport Management Company Limited | Households | 2011 |
| LPR Creative Ltd | Information & communication | 2015 |
| LQ Data Services Ltd | Information & communication | 2022 |
| Lrnt Ltd | Education | 2026 |
| LS Management Services Ltd | Professional & scientific | 2024 |
| Ltmt Locum Limited | Health & social care | 2024 |
| Ltproducts Ltd | Wholesale & retail | 2018 |
| Lucas Developments Ltd Limited | Construction | 2014 |
| Lucentive Labs Ltd | Information & communication | 2026 |
| Lucernae Limited | Information & communication | 2019 |
| Lucid Futures Limited | Information & communication | 2010 |
| Lucid OWL Consulting Ltd | Professional & scientific | 2017 |
| Lucy Hann Limited | Professional & scientific | 2019 |
| Lucy Manski Design Limited | Professional & scientific | 2024 |
| Lulworth Stone Limited | Education | 2020 |
| Lumen Insurtech Consulting Limited | Financial services | 2020 |
| Lumin Consulting Group Limited | Information & communication | 2022 |
| Lumina Locus Ltd | Real estate | 2024 |
| Luminesce Limited | Professional & scientific | 2023 |
| Luminor Consulting Ltd | Professional & scientific | 2025 |
| Luminos Solutions Ltd | Professional & scientific | 2018 |
| Lumirithmic Limited | Manufacturing | 2020 |
| Lupe Data Limited | Information & communication | 2024 |
| Luscious Liaisons Limited | Other services | 2009 |
| Luve Coffee Company Ltd | Manufacturing | 2023 |
| Luxton Developments Limited | Construction | 2017 |
| Luzborough Green Management Company Limited | Households | 2018 |
| LW Renovate Ltd | Construction | 2026 |
| LWH Testing Solutions Limited | Information & communication | 2018 |
| Lyme & Partners Limited | Professional & scientific | 2018 |
| Lymington Optical Ltd | Wholesale & retail | 2021 |
| Lyncroft Construction Limited | Construction | 1981 |
| Lyndco Holdings Ltd | Financial services | 2022 |
| Lynden Projects Limited | Information & communication | 2022 |
| Lyndhurst Capital and Advisory Limited | Professional & scientific | 2016 |
| Lyndrick Ltd | Information & communication | 2023 |
| Lystor Consulting Ltd | Information & communication | 2021 |
| Lytchett Bay Construction Limited | Construction | 2025 |
| M & C Supplies Limited | Wholesale & retail | 2011 |
| M & M (Bournemouth) Limited | Financial services | 2013 |
| M & M (Talbot) Ltd | Financial services | 2022 |
| M & M (Wimborne) Ltd | Financial services | 2020 |
| M B Couriers Dorset Ltd | Transport & logistics | 2025 |
| M E Electrical Services Ltd | Administrative & support | 2013 |
| M J White European Caravan Transport Limited | Transport & logistics | 2011 |
| M Wyatt Agricultural Contractors Limited | Water & waste | 2002 |
| M&M Singh Holdings Limited | Financial services | 2026 |
| M&S Electrical Contracting Services Ltd | Construction | 2022 |
| M&S Investments Limited | Financial services | 2013 |
| M.J.S. Accountancy Limited | Professional & scientific | 2012 |
| M/R Building and Property Ltd | Construction | 2025 |
| Maaz Consulting Limited | Professional & scientific | 2022 |
| Mablie Limited | Hospitality | 2026 |
| Machinai Limited | Professional & scientific | 2020 |
| Mackenzie Motors Limited | Wholesale & retail | 2018 |
| Mackenzie Renewables Limited | Professional & scientific | 2022 |
| Macnolan Ltd | Construction | 2017 |
| Macondo 84 Limited | Professional & scientific | 2016 |
| Madding Crowd Limited | Hospitality | 2018 |
| Maddison's Attic Ltd | Wholesale & retail | 2022 |
| Made at the Maltings Limited | Information & communication | 2021 |
| Made by Phunky Limited | Information & communication | 2022 |
| Madgra Ltd | Information & communication | 2013 |
| Magdon Scaffolding (UK) Ltd | Construction | 2015 |
| Magenheimer Consulting Limited | Construction | 2020 |
| Magna Court Management Limited | Households | 1990 |
| Magna Facilities Management Ltd | Construction | 2022 |
| Magna Property Management South Ltd | Real estate | 2022 |
| Magnatech Engineering Limited | Manufacturing | 2011 |
| Magnetic North Melodies Limited | Information & communication | 2014 |
| Magnus Bespoke Homes Limited | Extraterritorial | 2025 |
| Magstone Ltd | Construction | 2016 |
| Mahar Enterprises Ltd | Professional & scientific | 2017 |
| Maharani Solutions Ltd | Information & communication | 2022 |
| Maharoot Ltd | Information & communication | 2023 |
| Maidment Properties Limited | Construction | 2008 |
| Mainland Property Group Ltd | Real estate | 2025 |
| Mainliacht Limited | Professional & scientific | 2023 |
| Mainly Digital Marketing Limited | Professional & scientific | 2018 |
| Mainstream Electrical Limited | Professional & scientific | 2012 |
| Maison Demi Karan Ltd | Professional & scientific | 2023 |
| Majenco Ltd | Manufacturing | 2026 |
| Mako Holdings Ltd | Professional & scientific | 2018 |
| Mala Communications Limited | Information & communication | 2024 |
| Mala Inc Limited | Arts & recreation | 2016 |
| Malkit L Limited | Real estate | 2019 |
| Maller's Consultancy Limited | Information & communication | 2019 |
| Maltman Consortium Ltd | Hospitality | 2021 |
| Mambo Computers Limited | Information & communication | 2022 |
| Manchiapps Ltd | Information & communication | 2013 |
| Manifesto Agency Ltd | Information & communication | 2023 |
| Manifold Explorations Limited | Professional & scientific | 2020 |
| Manifold Solutions Limited | Professional & scientific | 2024 |
| Manjet Electronics Limited | Manufacturing | 2011 |