| 4 Boundary Lane Management Company Limited | Households | 2016 |
| A J S Drylining Limited | Construction | 2000 |
| Acts of Faith Ministries Limited | Other services | 2006 |
| AJS Site Maintenance Limited | Construction | 2026 |
| BOB Jackson Limited | Real estate | 2005 |
| Cyberental (U.K.) Limited | Information & communication | 1997 |
| DVR Homes Ltd | Real estate | 2025 |
| Elstree Light & Power Ltd | Information & communication | 1978 |
| Heritage (History & Horsepower) Limited | Extraterritorial | 2019 |
| Hudson Kapel 101 Limited | Wholesale & retail | 2022 |
| Hudson Kapel Limited | Extraterritorial | 2023 |
| K F Projects Limited | Administrative & support | 2010 |
| Lock IT UP Limited | Other services | 2020 |
| Millennium Studios Limited | Hospitality | 1993 |
| Milton Keynes Orthopaedic & Sports Clinic Limited | Real estate | 1993 |
| MSK DOC Ltd | Health & social care | 2024 |
| Nature Thrive Ltd | Professional & scientific | 2024 |
| Post Production Ltd | Information & communication | 2004 |
| QT Adventure Playgrounds Limited | Construction | 2003 |
| Reemaq Limited | Extraterritorial | 2026 |
| Reemaq Standish Limited | Wholesale & retail | 2011 |
| Sawmills Studio Kernow Ltd | Hospitality | 2025 |
| Shed 2 Ltd | Real estate | 2012 |
| Site Accessories Limited | Wholesale & retail | 2013 |
| Steel Bits Limited | Manufacturing | 2012 |
| Stem Solutions Limited | Other services | 2020 |
| TDF Heritage Ltd | Wholesale & retail | 2019 |
| TDF Limited | Professional & scientific | 2009 |
| TDF Precision Engineering Limited | Wholesale & retail | 2019 |