| Program Office Ltd | Information & communication | 2011 |
| Programming Guru Limited | Information & communication | 2018 |
| Progressive Tours Limited | Administrative & support | 1948 |
| Project Associates Contracts Limited | Professional & scientific | 1994 |
| Project Interiors Refurbishment Ltd | Construction | 2014 |
| Prop Monkey Ltd | Information & communication | 2016 |
| Prosper Property Investors Ltd | Real estate | 2017 |
| Prosperity Crest Ltd | Real estate | 2025 |
| Providence Land Limited | Real estate | 2002 |
| Providens Limited | Professional & scientific | 2022 |
| Prps (MK) Limited | Professional & scientific | 2020 |
| Pryme Consultants Ltd | Construction | 2020 |
| PS Amcose Consulting Limited | Professional & scientific | 2012 |
| Psychotherapy Counselling Ltd | Health & social care | 2012 |
| Ptolemy Mining Limited | Mining & quarrying | 2022 |
| Puffyn Ltd | Information & communication | 2024 |
| Punjabi Properties Ltd | Real estate | 2020 |
| Pure Cold Limited | Manufacturing | 2001 |
| Pure Cold Property Limited | Construction | 2025 |
| Pure Cold Solutions Ltd | Manufacturing | 2024 |
| Pure Construction Logistics Ltd | Construction | 2023 |
| Purepride Limited | Extraterritorial | 1997 |
| Purestone Syndicate 1 LLP | | 2022 |
| Purple LAB Limited | Information & communication | 2013 |
| PW Insights Ltd | Administrative & support | 2017 |
| Pyara & JAS Wines Ltd | Wholesale & retail | 2023 |
| Pyrton Court Residents Association Limited | Professional & scientific | 2013 |
| QI Contractors Ltd | Construction | 2018 |
| Qs(Gb) Limited | Professional & scientific | 2023 |
| QT1 Nominee Limited | Professional & scientific | 2018 |
| QT2 Nominee Limited | Professional & scientific | 2018 |
| QU Commercial Limited | Professional & scientific | 2019 |
| Quad 4 Limited | Manufacturing | 2016 |
| Quality Brains Limited | Administrative & support | 2024 |
| Quantum Ally Ltd | Information & communication | 2025 |
| Quantum Mgmt Limited | Information & communication | 2025 |
| Quartermaster Hospitality Ltd | Professional & scientific | 2025 |
| Qubit Accounts Ltd | Professional & scientific | 2015 |
| Quick Thinkers Ltd | Education | 2021 |
| Quill Directors Limited | Professional & scientific | 2010 |
| Quill Hall Arboriculture Limited | Agriculture & fishing | 2019 |
| Quill Hall Arboriculture Partners LLP | | 2023 |
| Quill Trustee Limited | Financial services | 2017 |
| Quilshine Ltd | Professional & scientific | 2024 |
| Quiltwood Limited | Real estate | 2014 |
| Quinton Mann Enterprises Ltd | Real estate | 2015 |
| R & a Dental Care Ltd | Health & social care | 2014 |
| R Hogan & Company Limited | Construction | 2013 |
| R Hughes Medical Limited | Health & social care | 2020 |
| R M T Construction Limited | Construction | 2004 |
| R M Terry Limited | Wholesale & retail | 2002 |
| R Mckee Limited | Information & communication | 2023 |
| R&B Management & Consultancy Ltd | Professional & scientific | 2025 |
| R&R Retreats Limited | Hospitality | 2025 |
| R. O'Leary Limited | Other services | 1998 |
| R2AH UK Limited | Information & communication | 2024 |
| Ra-Za Medical Innovation Limited | Health & social care | 2024 |
| Raamutech Limited | Information & communication | 2023 |
| Raans Barns Management Limited | Households | 2012 |
| Raans Road Development Limited | Construction | 2016 |
| Rabbitohs Leisure Limited | Extraterritorial | 2017 |
| Rachael Nolan Productions Ltd | Arts & recreation | 2023 |
| Radio Christmas CIC | Information & communication | 2023 |
| Rahi Systems Limited | Information & communication | 2018 |
| Raikash Engineering and Project Management Ltd | Professional & scientific | 2022 |
| Raikash Ltd | Real estate | 2021 |
| Rajalingam Limited | Hospitality | 2025 |
| Ralph’S Bakery Ltd | Manufacturing | 2023 |
| Ramisetty Consultancy Ltd | Information & communication | 2017 |
| Ramsey Dean Limited | Professional & scientific | 2025 |
| Ranebrook Windows Ltd | Construction | 2012 |
| Ranebrook Windows Timber Frames Ltd | Construction | 2024 |
| Ranefield Limited | Construction | 2012 |
| Rapid Fire and Safety UK Limited | Manufacturing | 2018 |
| Rare Disease Research Partners Ltd | Professional & scientific | 2019 |
| Rassayan Ltd | Hospitality | 2026 |
| Raychester Ltd | Administrative & support | 2025 |
| RB & K Properties Ltd | Real estate | 2016 |
| RB & K Retail Limited | Wholesale & retail | 2017 |
| RC PAY Clubs Ltd | Administrative & support | 2023 |
| RCB Property Management Ltd | Administrative & support | 2015 |
| Rcdp Associates Limited | Professional & scientific | 2009 |
| RDF Limited | Professional & scientific | 1992 |
| Rdtp Ltd | Wholesale & retail | 2013 |
| Re.Code Holistics Ltd | Public administration | 2026 |
| Realise Recruitment Services Ltd | Administrative & support | 2022 |
| Red Catalyst Limited | Professional & scientific | 2009 |
| Red Head Revolution Limited | Arts & recreation | 2025 |
| Red Kite Holdings Ltd | Education | 2021 |
| Red Lion (Ahow) Limited | Other services | 2009 |
| Red Lion Little Missenden Limited | Hospitality | 2020 |
| Red Tupelo Limited | Administrative & support | 2017 |
| RED5MEDIA Limited | Professional & scientific | 2007 |
| Redgum Consulting Limited | Professional & scientific | 2025 |
| Reel Grounds Ltd | Transport & logistics | 2025 |
| Refreshed Clothing Ltd | Wholesale & retail | 2020 |
| Regatta Financial Solutions Limited | Financial services | 2021 |
| Regatta FS 1 Ltd | Financial services | 2021 |
| Regatta FS 2 Ltd | Financial services | 2021 |
| Regatta FS 3 Ltd | Financial services | 2022 |