| THE National Tall Ships Centre Limited | Professional & scientific | 1969 |
| THE Nest at NO 7 Limited | Wholesale & retail | 2010 |
| THE New Business Studio Ltd | Professional & scientific | 2016 |
| THE New George Inn Limited | Hospitality | 2011 |
| THE Nommel Company Ltd | Other services | 2020 |
| THE Nude Clinic Ltd | Extraterritorial | 2021 |
| THE NUE Clinic Ltd | Other services | 2020 |
| THE Number Guys Ltd | Professional & scientific | 2026 |
| THE Oakplace Group Services Ltd | Wholesale & retail | 2024 |
| THE Oasis Project (the Gambia) Limited | Real estate | 2024 |
| THE Oche Shop Ltd | Education | 2024 |
| THE Office Furniture Store Limited | Extraterritorial | 2012 |
| THE Official Faces Limited | Extraterritorial | 2023 |
| THE Old ALE House Limited | Hospitality | 2015 |
| THE Old Bakery, Buckingham Ltd | Real estate | 2017 |
| THE Old Building (Bradford) Ltd | Real estate | 2019 |
| THE Old Dairy Farm Camping and Caravanning Limited | Hospitality | 2020 |
| THE Old Dairy Management Company (Buckingham Road) Ltd | Extraterritorial | 2013 |
| THE Old Hotel Management Company Limited | Other services | 2007 |
| THE Old Rectory (MK) Ltd | Households | 2025 |
| THE Old Swan Bletchley Ltd | Hospitality | 2026 |
| THE Old Tackle Shop Ltd | Real estate | 2022 |
| THE Old White Lion at Wicken Ltd | Hospitality | 2025 |
| THE Old Willow Works Ltd | Other services | 1990 |
| THE Oligarch Limited | Hospitality | 2021 |
| THE One Bathroom Limited | Construction | 2015 |
| THE One Kind Limited | Wholesale & retail | 2025 |
| THE Open Journal Media Ltd | Information & communication | 2018 |
| THE Open University Students Association | Education | 2019 |
| THE Opportunity Consultants Ltd | Professional & scientific | 2024 |
| THE Optimum Modification Limited | Information & communication | 2015 |
| THE Opus Rooms Ltd | Administrative & support | 2024 |
| THE Organic Naked Inc. Ltd | Manufacturing | 2024 |
| THE Original Double Red Limited | Professional & scientific | 1998 |
| THE Orkis Group Ltd | Real estate | 2011 |
| THE Orkis Group SPV-1 Ltd | Real estate | 2024 |
| THE Outliers Network Ltd | Other services | 2021 |
| THE Outpouring UK Ltd | Information & communication | 2022 |
| THE Oxley Limited | Health & social care | 2024 |
| THE Packaging Federation | Other services | 1995 |
| THE Palatial Group Ltd | Real estate | 2022 |
| THE Pamper Cabin Ltd | Extraterritorial | 2017 |
| THE Pancake Corner Ltd | Hospitality | 2024 |
| THE Parade (Haddenham) Limited | Real estate | 1995 |
| THE Parking Spaces Rentals Business Limited | Transport & logistics | 2016 |
| THE Patch MK Limited | Agriculture & fishing | 2020 |
| THE Patchwork Fold Ltd | Agriculture & fishing | 2025 |
| THE Paving Experts Ltd | Administrative & support | 2025 |
| THE Pension Bureau Limited | Extraterritorial | 2010 |
| THE Perfume Stop Ltd | Wholesale & retail | 2022 |
| THE Personalised Christmas Company Ltd | Wholesale & retail | 2018 |
| THE Physio Cabin Limited | Other services | 2021 |
| THE Pilates Place Limited | Arts & recreation | 2002 |
| THE Pimento Grill Ltd | Hospitality | 2020 |
| THE Pines (Ashton) Management Company Limited | Households | 2023 |
| THE Place for YOU Ltd | Real estate | 2021 |
| THE Planet MG Ltd | Wholesale & retail | 2024 |
| THE Plate & Parlour Co. Ltd | Wholesale & retail | 2025 |
| THE Play's the Thing Theatre Company Community Interest Company | Arts & recreation | 2008 |
| THE Plough Simpson Ltd | Hospitality | 2019 |
| THE Plumbing & Heating Suppliers Ltd | Wholesale & retail | 2022 |
| THE Pocket Fragrance Company Ltd | Wholesale & retail | 2024 |
| THE Pocket Gym Ltd | Professional & scientific | 2025 |
| THE Point Kiosk Limited | Wholesale & retail | 2012 |
| THE Potters Hive Ltd | Wholesale & retail | 2026 |
| THE Powerful Play Teachers Ltd | Education | 2024 |
| THE Precious Foundation | Health & social care | 2010 |
| THE Printing and Mailing Company Limited | Manufacturing | 2001 |
| THE Printshop (MK) Ltd | Administrative & support | 2015 |
| THE Property Buyers Business Limited | Real estate | 2011 |
| THE Property Cleaning Business Limited | Administrative & support | 2016 |
| THE Property Marketing Strategists Ltd | Professional & scientific | 2022 |
| THE Property Rentals (Milton Keynes) Business. Limited | Real estate | 2000 |
| THE Property Rentals Business Limited | Real estate | 2011 |
| THE Property Superheroes Ltd | Real estate | 2021 |
| THE Proton Group Limited | Manufacturing | 1971 |
| THE PSP Association | Health & social care | 1994 |
| THE Pspa Trading Company Limited | Administrative & support | 2014 |
| THE PT Centre (MK) Ltd | Arts & recreation | 2015 |
| THE Publick Ltd | Information & communication | 2026 |
| THE Queensbury Group LLP | | 2024 |
| THE Quiet Key Ltd | Real estate | 2026 |
| THE RAD Konsults Limited | Information & communication | 2015 |
| THE Radiator Factory Limited | Construction | 2003 |
| THE RAE Network Ltd | Wholesale & retail | 2019 |
| THE Ranger Care and Cleaning Services Limited | Extraterritorial | 2023 |
| THE Reality App Ltd | Information & communication | 2026 |
| THE Really Good Group Ltd | Manufacturing | 2019 |
| THE Really Nice Garden Company Limited | Professional & scientific | 2004 |
| THE Redeemed Christian Church of GOD - Jerusalem Tabernacle of Nations Ltd | Other services | 2016 |
| THE Redeemed Christian Church of GOD Jesus Sanctuary Northampton | Health & social care | 2014 |
| THE Redeemed Christian Church of GOD Maranatha Assembly | Other services | 2017 |
| THE Redeemed Christian Church of GOD Praise Palace Northampton | Other services | 2023 |
| THE Redeemed Christian Church of GOD Tabernacle of HIS Presence | Other services | 2012 |
| THE Redeemed Christian Church of GOD Winners Pavilion Milton Keynes | Education | 2012 |
| THE Refined Form Clinic Ltd | Other services | 2025 |
| THE Reformer Room MK Ltd | Arts & recreation | 2026 |
| THE Refresher MK Ltd | Administrative & support | 2024 |
| THE Remote PA Services Ltd | Administrative & support | 2021 |
| THE Residential Grid Ltd | Information & communication | 2026 |