| Mortimer Logistics Ltd | Real estate | 2021 |
| Morton Hollingdale Limited | Professional & scientific | 2017 |
| Mosaic PCN Limited | Health & social care | 2023 |
| Moscrop Court Freehold Limited | Households | 2011 |
| Moscrop Court Residents Association (Basingstoke) Limited | Households | 1983 |
| Mothwood Partnership Ltd | Professional & scientific | 2016 |
| Motionled Technology Enterprise Ltd | Administrative & support | 2017 |
| Motionled Technology Limited | Information & communication | 2013 |
| Motive Cortex Limited | Information & communication | 2016 |
| Motorcycle Trading Limited | Wholesale & retail | 2012 |
| Motorway Guys Limited | Transport & logistics | 2022 |
| Motouch Care Limited | Administrative & support | 2024 |
| Moundsmere Estate Management Limited | Real estate | 1999 |
| Mount Farm Cottage Limited | Hospitality | 2022 |
| Mount Lettings Limited | Real estate | 2019 |
| Moves Academy Ltd | Education | 2023 |
| Moving Image Content Ltd | Information & communication | 2023 |
| Mowtech Ltd | Agriculture & fishing | 2017 |
| MPC (Basingstoke) Ltd | Wholesale & retail | 2003 |
| MPE Holdings Limited | Financial services | 2017 |
| MPS Asset Finance Ltd | Information & communication | 2015 |
| Mps.Cloud Ltd | Professional & scientific | 2013 |
| MPV Drylining Ltd | Construction | 2017 |
| MQ Consultants Limited | Professional & scientific | 2012 |
| MQP Maintenance Ltd | Construction | 2025 |
| Mqsp Limited | Professional & scientific | 2012 |
| MR FIX IT Network Ltd | Construction | 2021 |
| MR Life Sciences Ltd | Health & social care | 2025 |
| MR Major Ltd | Transport & logistics | 2019 |
| MR Mouse Collectibles Limited | Wholesale & retail | 2009 |
| MR Plumbsingh Ltd | Construction | 2015 |
| MR4 Holdings Ltd | Real estate | 2023 |
| Mrix Ltd | Professional & scientific | 2006 |
| MRR Financial Planning Ltd | Financial services | 2026 |
| MRS Delivery Ltd | Transport & logistics | 2019 |
| MRS Sheen's Cleaners Ltd | Administrative & support | 2016 |
| MSE Building Ltd | Manufacturing | 2025 |
| MSG Blueprint Limited | Professional & scientific | 2010 |
| Msolve Solutions Limited | Real estate | 2016 |
| MSP Estate Agents Ltd | Real estate | 2025 |
| Mthb Company Limited | Wholesale & retail | 2024 |
| MTK Management Limited | Real estate | 2019 |
| Mts-Es Limited | Professional & scientific | 2020 |
| MUC OFF Cleaning Services Ltd | Administrative & support | 2020 |
| Mukul Limited | Information & communication | 2026 |
| Multi Complex Services Ltd | Construction | 2020 |
| Multi Trades Online Ltd | Education | 2020 |
| Multi Trades Training Ltd | Education | 2018 |
| Multitone (UK) Ltd | Professional & scientific | 1993 |
| Multitone Retirement Benefits Plan Trustee Limited | Financial services | 2015 |
| MUM of Sons Limited | Hospitality | 2020 |
| Mumin Transport Ltd | Transport & logistics | 2019 |
| Munchies Mobile Food Ltd | Hospitality | 2026 |
| Murray Property Consultants Ltd | Professional & scientific | 2022 |
| Musi Limited | Public administration | 2025 |
| Music Beyond Mainstream Limited | Arts & recreation | 2005 |
| Muti Nayyar Ltd | Professional & scientific | 2025 |
| Muttiallu Ltd | Information & communication | 2020 |
| Mutton Bones Ltd | Arts & recreation | 2005 |
| Muusa Ltd | Wholesale & retail | 2026 |
| Muvit Ltd | Information & communication | 2026 |
| MV Mechanical Services Limited | Construction | 2023 |
| MVC Property Limited | Real estate | 2019 |
| MW Engineers Limited | Construction | 2021 |
| MW Financial Ltd | Financial services | 2020 |
| MW Propertyline Limited | Real estate | 2022 |
| MWP Partnership Ltd | Real estate | 2014 |
| MX Aerospace Ltd. | Wholesale & retail | 2023 |
| MX Diamonds Limited | Other services | 2018 |
| MX Jets Limited | Other services | 2010 |
| MXS Logistics Ltd | Transport & logistics | 2023 |
| My Car Place Ltd | Wholesale & retail | 2025 |
| My Care Friend Ltd | Administrative & support | 2020 |
| My Carpenter Ltd | Construction | 2017 |
| My Diamond CUT Wheels Ltd | Wholesale & retail | 2024 |
| My FAB Closet Limited | Wholesale & retail | 2016 |
| My Golf Ltd | Manufacturing | 2021 |
| My Hypnotherapy Works Ltd. | Extraterritorial | 2015 |
| My Partner in Time Ltd | Administrative & support | 2023 |
| My Transdar.Com Ltd | Transport & logistics | 2016 |
| My Wellness Journey Ltd | Information & communication | 2026 |
| Myalloys Ltd | Wholesale & retail | 2011 |
| MYC International Ltd | Wholesale & retail | 2024 |
| Mygadgetumbrella Ltd | Financial services | 2021 |
| Myreceptionist UK Limited | Extraterritorial | 2022 |
| Mysons Ltd | Construction | 2017 |
| Mystery Tech Ltd | Information & communication | 2014 |
| MZ Brows & Beauty Ltd | Other services | 2021 |
| MZL Builders Ltd | Construction | 2024 |
| N & J Meadham Limited | Construction | 1997 |
| N H Lighting & Electrical Ltd | Construction | 2013 |
| N K & P UK Services Ltd | Other services | 2019 |
| N R J Energy Limited | Professional & scientific | 2019 |
| N.Y.A & Sons Trans Ltd | Transport & logistics | 2014 |
| N2N Solutions Limited | Information & communication | 1998 |
| NA Medical Consultancy Limited | Health & social care | 2014 |
| Nagle Renovations Ltd | Construction | 2025 |
| Nail Bar Basingstoke Ltd | Other services | 2025 |
| Nailsbynzelle Ltd | Other services | 2025 |
| Nakatomi Rentals Ltd | Other services | 2021 |