| Milton Keynes Chiropractic Clinic Ltd | Health & social care | 2010 |
| Milton Keynes Citizens Advice Bureau | Information & communication | 1988 |
| Milton Keynes Citizens Advice Bureau (Trading) Limited | Information & communication | 2004 |
| Milton Keynes City Football Club Limited | Arts & recreation | 2007 |
| Milton Keynes City Glaziers Limited | Construction | 1978 |
| Milton Keynes City Sports and Social Club Limited | Hospitality | 2024 |
| Milton Keynes City Television Limited | Arts & recreation | 2023 |
| Milton Keynes Commercial Ground Care Ltd | Manufacturing | 2015 |
| Milton Keynes Community Hub Ltd | Professional & scientific | 2026 |
| Milton Keynes Community Radio Ltd | Information & communication | 2024 |
| Milton Keynes Cookery School Ltd | Hospitality | 2018 |
| Milton Keynes Cycling Association Limited | Arts & recreation | 2011 |
| Milton Keynes DAF Limited | Professional & scientific | 1982 |
| Milton Keynes Dance Performance Limited | Arts & recreation | 2025 |
| Milton Keynes Development Partnership LLP | | 2012 |
| Milton Keynes Developments (MK) Limited | Extraterritorial | 2020 |
| Milton Keynes Developments Ltd. | Administrative & support | 1996 |
| Milton Keynes Dons Football Club Sports & Education Trust | Education | 2008 |
| Milton Keynes Dons Limited | Arts & recreation | 2003 |
| Milton Keynes Driveways Ltd | Construction | 2025 |
| Milton Keynes Festival Fringe C.I.C. | Arts & recreation | 2013 |
| Milton Keynes Financial Advice Limited | Administrative & support | 2016 |
| Milton Keynes Football Club Limited | Arts & recreation | 2005 |
| Milton Keynes Garden Services Limited | Wholesale & retail | 2012 |
| Milton Keynes Gearbox Centre Limited | Administrative & support | 2018 |
| Milton Keynes Go-Karting Ltd | Arts & recreation | 2003 |
| Milton Keynes Handyman Limited | Construction | 2019 |
| Milton Keynes Home Care Ltd | Health & social care | 2011 |
| Milton Keynes IAC | Administrative & support | 2013 |
| Milton Keynes Ice Hockey Club Ltd | Education | 2019 |
| Milton Keynes Irish Centre Limited | Hospitality | 2005 |
| Milton Keynes KIZ CIC | Education | 2026 |
| Milton Keynes Landscapes Ltd | Administrative & support | 2026 |
| Milton Keynes Lettings Ltd | Households | 2023 |
| Milton Keynes Logistics Limited | Transport & logistics | 2013 |
| Milton Keynes Marina Limited | Arts & recreation | 2009 |
| Milton Keynes Marketing Ltd | Professional & scientific | 2024 |
| Milton Keynes Mobile Tyre Fitting Ltd | Wholesale & retail | 2025 |
| Milton Keynes Model Railway Society Limited | Other services | 2012 |
| Milton Keynes Montessori CIC | Education | 2014 |
| Milton Keynes Motorcycle Centre Limited | Wholesale & retail | 2017 |
| Milton Keynes Museum Trust Ltd | Arts & recreation | 1988 |
| Milton Keynes Music Academy C.I.C. | Education | 2021 |
| Milton Keynes OK Service Stations Limited | Real estate | 1978 |
| Milton Keynes Parks Trust Limited | Administrative & support | 1990 |
| Milton Keynes Play Association | Arts & recreation | 1995 |
| Milton Keynes Plumbing & Heating Services Ltd | Construction | 2022 |
| Milton Keynes Plumbing & Heating Solutions Limited | Construction | 2024 |
| Milton Keynes Plumbing Ltd | Construction | 2024 |
| Milton Keynes Preparatory School Limited | Education | 1986 |
| Milton Keynes Pressings Limited | Manufacturing | 1989 |
| Milton Keynes Pride Festival C.I.C. | Administrative & support | 2020 |
| Milton Keynes Property Management Ltd | Real estate | 2021 |
| Milton Keynes Property Solutions Ltd | Real estate | 2024 |
| Milton Keynes Real Estate Ltd | Real estate | 2024 |
| Milton Keynes Recovery Ltd | Transport & logistics | 2021 |
| Milton Keynes Road Sweepers Ltd | Construction | 2022 |
| Milton Keynes Roofing & Building Maintenance Limited | | 1983 |
| Milton Keynes Roofing Ltd | Construction | 2025 |
| Milton Keynes Rowing Club Ltd | Arts & recreation | 2018 |
| Milton Keynes Rugby Union Football Club Limited | Arts & recreation | 2011 |
| Milton Keynes Security Limited | Administrative & support | 2003 |
| Milton Keynes Shopping Centre Association Limited(The) | Other services | 1980 |
| Milton Keynes Somali Community Association | Administrative & support | 2017 |
| Milton Keynes Special Needs Advancement Project | Health & social care | 1990 |
| Milton Keynes Studios Limited | Administrative & support | 2013 |
| Milton Keynes Surveys Limited | Construction | 2003 |
| Milton Keynes Tabernacle | Other services | 2006 |
| Milton Keynes Table Tennis Centre Limited | Arts & recreation | 1992 |
| Milton Keynes Tanzanian Community | Education | 2025 |
| Milton Keynes Technology Ltd | Wholesale & retail | 2025 |
| Milton Keynes Tennis Club Limited | Arts & recreation | 2016 |
| Milton Keynes Tours Ltd | Administrative & support | 2018 |
| Milton Keynes Training Centre Ltd | Administrative & support | 2020 |
| Milton Keynes Umbrella Project Limited | Education | 2024 |
| Milton Keynes Upholsterers Limited | Other services | 2002 |
| Milton Keynes Urgent Care Services Community Interest Company | Health & social care | 2008 |
| Milton Keynes Vehicle Leasing Ltd | Administrative & support | 2026 |
| Milton Keynes Vehicle Rental Ltd | Administrative & support | 2009 |
| Milton Keynes Veterinary Group Limited | Professional & scientific | 2015 |
| Milton Keynes Water Systems Ltd | Extraterritorial | 2021 |
| Milton Keynes Women's AID | Health & social care | 1988 |
| Milton Keynes Yoga Association | Health & social care | 2025 |
| Milton Kleans Ltd | Administrative & support | 2025 |
| Milton Machines Limited | Extraterritorial | 2022 |
| Milton Meadows Ltd | Real estate | 2025 |
| Milton Motor Sales Ltd | Wholesale & retail | 2023 |
| Milton Property Lettings Limited | Real estate | 2021 |
| Milton Rose Investments Unlimited | Other services | 2022 |
| Milton Secretaries Limited | Professional & scientific | 2000 |
| Miltonkleen Limited | Administrative & support | 2025 |
| Mimap Goshen Ltd | Real estate | 2024 |
| Mimibridge Solutions Ltd | Wholesale & retail | 2025 |
| Mimikay Healthcare Ltd | Health & social care | 2024 |
| Mimitobias Limited | Real estate | 2004 |
| Mimoviez Limited | Information & communication | 2017 |
| Mimshack Vessels Healthcare Limited | Health & social care | 2022 |
| MIN YU YUE Ltd. | Wholesale & retail | 2025 |
| Mind Buddy Limited | Health & social care | 2025 |
| Mind Care Health Limited | Health & social care | 2025 |