| LWS Property Ltd | Real estate | 2017 |
| LX Field Solutions Ltd | Information & communication | 2025 |
| Lycan Media Ltd | Wholesale & retail | 2024 |
| Lychee AI Ltd | Information & communication | 2026 |
| Lyck Liss Stories Limited | Manufacturing | 2021 |
| Lyfe+ Limited | Other services | 2023 |
| Lyme Splash Water Polo Ltd | Arts & recreation | 2025 |
| Lyme Townhouse Limited | Hospitality | 2021 |
| Lymington Sushi Ltd | Wholesale & retail | 2019 |
| Lynnwood Property Limited | Real estate | 2017 |
| Lynwood Residences Ltd | Administrative & support | 2024 |
| Lynx Property Maintenance & Builders Ltd | Construction | 2008 |
| Lytchett Bay Fabrication & Welding Ltd | Manufacturing | 2026 |
| Lytchett Bay Foods Ltd | Hospitality | 2025 |
| Lytchett Heath Polo LLP | | 2012 |
| Lytchett Laser Clinic LLP | | 2026 |
| Lytchett Matravers Driver Training Ltd | Education | 2022 |
| Lytchett Matravers Storage Limited | Transport & logistics | 2022 |
| Lytchett Minster Rugby Football Club Limited | Arts & recreation | 2008 |
| Lytton (Bournemouth) Limited | Real estate | 2024 |
| Lódáil Limited | Information & communication | 2025 |
| L’Amour Living Ltd | Other services | 2019 |
| M & G Developments Limited | Construction | 1993 |
| M a Training & Consultancy Limited | Education | 2012 |
| M and C Steak Limited | Hospitality | 2024 |
| M and R Structures Ltd | Construction | 2016 |
| M and T Mech Services Ltd | Construction | 2016 |
| M B Welding Limited | Manufacturing | 2008 |
| M D Smith Cleaning Contractors Ltd | Administrative & support | 2021 |
| M D Smith Property Limited | Real estate | 2024 |
| M F Reading Limited | Construction | 2004 |
| M for Style Limited | Wholesale & retail | 2014 |
| M H H (Poole) Limited | Real estate | 2010 |
| M Holborn Electrical Contractor Limited | Construction | 2004 |
| M Holl& Ltd | Information & communication | 2024 |
| M I S U Co. Limited | Mining & quarrying | 2001 |
| M J Chacko Ltd | Health & social care | 2022 |
| M J H Construction (Southern) Ltd | Construction | 2022 |
| M Lafferty Limited | Construction | 2011 |
| M M Carpentry Service Ltd | Professional & scientific | 2021 |
| M P James (Construction) Limited | Construction | 2004 |
| M Property Solutions Ltd | Real estate | 2018 |
| M S C Management Ltd | Construction | 2019 |
| M S O Joinery Limited | Manufacturing | 2018 |
| M Superliner Transport Ltd | Transport & logistics | 2025 |
| M T H Designs Limited | Manufacturing | 2013 |
| M Transport Solutions Ltd | Transport & logistics | 2025 |
| M Yates Bricklayers Ltd | Construction | 2014 |
| M&B Land Promotions Limited | Real estate | 2019 |
| M&D Property Solutions Ltd | Real estate | 2016 |
| M&E Barber Limited | Other services | 2025 |
| M&J Cars of Poole Ltd | Wholesale & retail | 2024 |
| M&K Car Repair & Bodywork Ltd | Wholesale & retail | 2017 |
| M&L (BMS) Ltd | Professional & scientific | 2018 |
| M&L (Poole) Ltd | Hospitality | 2024 |
| M&M Baileys Ltd | Real estate | 2022 |
| M&M Carpentry & Marine Ltd | Manufacturing | 2021 |
| M&M Polishing Limited | Manufacturing | 2011 |
| M&M Shogun Consulting Ltd. | Wholesale & retail | 2020 |
| M&M's Properties Ltd | Real estate | 2026 |
| M&N Tackle Ltd | Wholesale & retail | 2026 |
| M&R Construction (Verwood) Ltd | Construction | 2019 |
| M&T Commerce Limited | Wholesale & retail | 2024 |
| M&W Meats (South West) Ltd | Manufacturing | 2023 |
| M'S Taurus Ltd | Wholesale & retail | 2023 |
| M-Craft Limited | Other services | 2020 |
| M-One Central Flat 62 Limited | Real estate | 2017 |
| M-Technical Group Ltd | Wholesale & retail | 2018 |
| M. & J. James (Developments) Limited | Construction | 1979 |
| M. Lewis Contract Ltd | Real estate | 1986 |
| M. Whittingham Limited | Professional & scientific | 2003 |
| M.A.N Coatings Ltd | Manufacturing | 2025 |
| M.A.O Developments Limited | Construction | 2023 |
| M.B. Coles and Sons Limited | Construction | 2002 |
| M.B. Crane Hire Limited | Administrative & support | 2016 |
| M.B. Pump Hire Limited | Administrative & support | 1997 |
| M.C Roofing Ltd | Construction | 2003 |
| M.Palmer H C B Services Limited | Administrative & support | 2012 |
| M.S.H. Electronics Limited | Manufacturing | 2003 |
| M.T.S. Motors Limited | Wholesale & retail | 2001 |
| M2M Cars Limited | Wholesale & retail | 2018 |
| M3 Autos Ltd | Wholesale & retail | 2018 |
| M3 Management Services Ltd | Real estate | 2015 |
| M3M Services Limited | Real estate | 2016 |
| M3RTS Holding Ltd | Information & communication | 2021 |
| M6 BR Limited | Wholesale & retail | 2025 |
| MA Direct Limited | Information & communication | 2017 |
| MA Infotech Ltd | Wholesale & retail | 2021 |
| MA Motor Trade Ltd | Wholesale & retail | 2024 |
| MA View NET Ltd | Wholesale & retail | 2024 |
| MA52 Services Ltd | Transport & logistics | 2024 |
| Maat Partners Limited | Professional & scientific | 2026 |
| Maatech Ltd | Information & communication | 2014 |
| Mabel & Jacks Limited | Wholesale & retail | 2010 |
| MAC Enterprises Limited | Information & communication | 2000 |
| MAC Marine Claims Ltd | Financial services | 2017 |
| Macacos Communications Ltd | Real estate | 2023 |
| Mach 2 Simulations Ltd | Information & communication | 2015 |
| Machine Hole Limited | Information & communication | 2026 |
| Mack Cleaning Supplies Ltd | Administrative & support | 2020 |