| Mixamart Ltd | Wholesale & retail | 2025 |
| Miximise Digital Ltd | Professional & scientific | 2024 |
| Mixwood Studio Limited | Information & communication | 2024 |
| MIZ Logistics Ltd | Transport & logistics | 2020 |
| MJ Builders and Decorators Limited | Construction | 2025 |
| MJ Electrics MK Limited | Construction | 2018 |
| MJA Advisory Ltd | Financial services | 2025 |
| MJC IT Testing Limited | Information & communication | 2023 |
| MJD Drainage Limited | Construction | 2018 |
| Mjdk Limited | Hospitality | 2012 |
| MJE Dynamics Ltd | Professional & scientific | 2025 |
| MJE Group Ltd | Real estate | 2022 |
| MJE Network Solutions Limited | Construction | 2012 |
| MJG Homes Ltd | Real estate | 2023 |
| MJG Partners Ltd | Professional & scientific | 2021 |
| Mjgcs Limited | Professional & scientific | 2014 |
| MJL Brickwork Ltd | Construction | 2022 |
| MJL Maintenance and Locks Ltd | Administrative & support | 2017 |
| MJM (Painters & Decorators) Limited | Construction | 1992 |
| MJM Corporation Ltd | Professional & scientific | 2015 |
| MJM Fitness Coaching Ltd | Other services | 2023 |
| MJP Management Limited | Real estate | 2012 |
| MJR Recruitment Ltd | Administrative & support | 2025 |
| Mjrc Services Ltd | Professional & scientific | 2025 |
| MJS Flooring Solutions Ltd | Construction | 2026 |
| MJT Communications Limited | Manufacturing | 2012 |
| MJW Marketing Services Limited | Professional & scientific | 2019 |
| MK 24/7 Care Ltd | Administrative & support | 2023 |
| MK Accident Car Repair Ltd | Wholesale & retail | 2025 |
| MK Accounting Services Limited | Professional & scientific | 2022 |
| MK Adams Limited | Professional & scientific | 2023 |
| MK Adediwura Logistical Services Ltd | Transport & logistics | 2024 |
| MK Afro Cosmetic Limited | Wholesale & retail | 2017 |
| MK Afro Limited | Wholesale & retail | 2020 |
| MK Analytics Ltd | Financial services | 2022 |
| MK Appliances Repair Ltd | Transport & logistics | 2018 |
| MK Arms Ltd | Hospitality | 2025 |
| MK Aromas Ltd | Wholesale & retail | 2023 |
| MK Arts for Health | Health & social care | 2004 |
| MK Asian Food Ltd | Hospitality | 2026 |
| MK Auto-Motors Limited | Wholesale & retail | 2014 |
| MK Autocare Ltd | Wholesale & retail | 2010 |
| MK Autopilot Limited | Education | 2025 |
| MK Beautiful Ltd | Other services | 2019 |
| MK Bespoke Renovations Ltd | Construction | 2026 |
| MK Best Car Deals Ltd | Wholesale & retail | 2017 |
| MK Best Pizza Ltd | Hospitality | 2023 |
| MK Bites & Brews Limited | Wholesale & retail | 2024 |
| MK Breakfast and Dessert Limited | Hospitality | 2025 |
| MK Brews Limited | Hospitality | 2022 |
| MK Bricks Ltd | Real estate | 2023 |
| MK Builders & Interiors Ltd | Construction | 2025 |
| MK Capital Allowances Advisory Ltd | Professional & scientific | 2016 |
| MK Car & Motorcycle Center Ltd | Wholesale & retail | 2024 |
| MK Car & Van Centre Ltd | Wholesale & retail | 2026 |
| MK Car Body Ltd | Wholesale & retail | 2022 |
| MK Car Doctor Ltd | Wholesale & retail | 2025 |
| MK Car Hub Ltd | Wholesale & retail | 2021 |
| MK Car Sales (MK) Limited | Administrative & support | 2017 |
| MK Car Supermarket Ltd | Wholesale & retail | 2024 |
| MK Caravan Storage Ltd | Transport & logistics | 2024 |
| MK Cardiologist Ltd | Health & social care | 2021 |
| MK Care Ltd | Administrative & support | 2014 |
| MK Carrier Ltd | Wholesale & retail | 2021 |
| MK Central Homes Ltd | Real estate | 2026 |
| MK Central Taxis Ltd | Transport & logistics | 2023 |
| MK City Autos Ltd | Wholesale & retail | 2024 |
| MK City Cars Ltd | Wholesale & retail | 2025 |
| MK City Driving School Ltd | Education | 2025 |
| MK City Health Ltd | Health & social care | 2024 |
| MK City Heating Ltd | Manufacturing | 2025 |
| MK City Plumbing & Heating Limited | Construction | 2022 |
| MK City Properties Ltd | Real estate | 2023 |
| MK City Solutions Limited | Construction | 2020 |
| MK City Taxis Ltd | Transport & logistics | 2024 |
| MK Citymarket Ltd | Real estate | 2023 |
| MK Cleaning Experts Ltd | Construction | 2024 |
| MK Cleaning Guru Ltd | Administrative & support | 2020 |
| MK Clinical Psychology Ltd. | Administrative & support | 2017 |
| MK Commercial Consultants Limited | Other services | 2020 |
| MK Community Care Limited | Health & social care | 2024 |
| MK Community Film Club CIC | Education | 2025 |
| MK Community Shop (Kingston) Limited | Wholesale & retail | 1993 |
| MK Community Shop (Shenley) Limited | Wholesale & retail | 1993 |
| MK Community Shop (Westcroft) Limited | Wholesale & retail | 1994 |
| MK Consulting Engineers Ltd | Construction | 1997 |
| MK Corporate Finance Limited | Financial services | 2013 |
| MK Corporate Trustees UK Limited | Professional & scientific | 2014 |
| MK Crafter Ltd | Arts & recreation | 2023 |
| MK Creative Images Ltd | Professional & scientific | 2008 |
| MK Cricket Coaching LAB Ltd | Education | 2026 |
| MK Cryo Ltd | Wholesale & retail | 2014 |
| MK Crystal Ltd | Administrative & support | 2023 |
| MK Curated Winter Fair Limited | Administrative & support | 2025 |
| MK Curry Corner Ltd | Hospitality | 2024 |
| MK Cypher Ltd | Information & communication | 2026 |
| MK Dark Kitchen Ltd | Hospitality | 2025 |
| MK Dart Limited | Wholesale & retail | 2018 |
| MK Depot Ltd | Wholesale & retail | 2023 |
| MK Digital Marketing Limited | Information & communication | 2019 |