| Manuella Foods Ltd | Wholesale & retail | 2023 |
| Marina Warsama Limited | Administrative & support | 2006 |
| Martin Allsuch & Co Rentals Limited | Real estate | 2014 |
| Masters Pharmaceuticals Limited | Manufacturing | 1984 |
| MAX Aura Consulting Limited | Professional & scientific | 2025 |
| Mcbull Facilities Management Limited | Real estate | 2025 |
| Mechanicall Ltd | Wholesale & retail | 2025 |
| MEDIK8 Limited | Manufacturing | 1999 |
| Meenal and Rishi Sachdev Foundation | Other services | 2016 |
| Megabay Limited | Construction | 2018 |
| Mersl Consultancy Limited | Professional & scientific | 2023 |
| Metstone Limited | Real estate | 2012 |
| Michels & Taylor Midco Limited | Hospitality | 2021 |
| Micromode Medical Limited | Health & social care | 1992 |
| Millville Limited | Construction | 2013 |
| Minverport Enterprises Limited | Real estate | 1983 |
| Mount Zion Victorious Church Limited | Other services | 2015 |
| MS Smiles Ltd | Health & social care | 2022 |
| MSG Facilities Management Limited | Administrative & support | 2006 |
| MTA Consulting Services Ltd | Other services | 2024 |
| Multilift-Ml Limited | Wholesale & retail | 2007 |
| My Options Ltd | Other services | 2012 |
| My Options Trust CIC | Other services | 2015 |
| My Story Tree Limited | Education | 2022 |
| Mzuri Properties Limited | Real estate | 2021 |
| N Cooper Plumbing and Heating Ltd | Construction | 2023 |
| N.B. Properties Limited | Households | 1987 |
| Nabila UK Ltd | Other services | 2014 |
| Naga UK Bidco Limited | Financial services | 2013 |
| Naga UK Topco Limited | Financial services | 2013 |
| Natan Limited | Construction | 2002 |
| Nexbell Limited | Real estate | 2014 |
| Nickys School of Swimming Ltd | Education | 2023 |
| Niemans Chemists Limited | Wholesale & retail | 1998 |
| Niemans Holdings Limited | Wholesale & retail | 2002 |
| Niemans Properties Limited | Real estate | 2015 |
| Nightingale Chauffeuring Ltd | Transport & logistics | 2024 |
| Nimsay Limited | Real estate | 2017 |
| Nina & Jessy Limited | Real estate | 2023 |
| Niptime Services LLP | | 2023 |
| NJO Properties Limited | Real estate | 2021 |
| NO Mystery Limited | Administrative & support | 2017 |
| Novelties Galore UK Limited | Transport & logistics | 2003 |
| Nvco LLP | | 2005 |
| NVM Investments Limited | Professional & scientific | 2014 |
| O.B.Y. Packaging Limited | Administrative & support | 2022 |
| Oblique London LLP | | 2013 |
| Observices Parking Consultancy Limited | Administrative & support | 1996 |
| Oliver Real Estate Ltd | Real estate | 2023 |
| One for ALL (UK) Ltd. | Wholesale & retail | 1992 |
| Optserv Ltd | Other services | 2022 |
| Orange Nagy Limited | Information & communication | 2017 |
| Orbityear Limited | Real estate | 2012 |
| Organ Hall Pharma Ltd | Wholesale & retail | 2024 |
| Ozturk Transport Ltd | Transport & logistics | 2024 |
| P & R Places Limited | Construction | 2025 |
| P & R Plumbing and Heating Limited | Construction | 2015 |
| P Shah & Associates Limited | Health & social care | 2019 |
| P&E Ragou Associates Ltd | Professional & scientific | 2024 |
| Pages Farm Cattery Ltd | Agriculture & fishing | 2021 |
| Paradon Logistics LLP | | 2023 |
| Parkvale Industries LLP | | 2007 |
| Penniwells Riding Centre for the Disabled | Arts & recreation | 2007 |
| Perfects Cabling Ltd | Information & communication | 2022 |
| Phillips Building & Renovations Limited | Construction | 2015 |
| Pinecrest Lodge Management Company Limited | Households | 2025 |
| Planet J Services Ltd | Other services | 2022 |
| Probay Distribution LLP | | 2023 |
| Proto Protect Ltd | Wholesale & retail | 2019 |
| Punjab Record Centre Limited | Professional & scientific | 2002 |
| QDL Limited | Information & communication | 2025 |
| Quay Corporate Limited | Real estate | 2020 |
| Quotient Land Ltd | Professional & scientific | 2015 |
| R N S Investment Corporation Ltd | Construction | 2024 |
| Radius Law Limited | Professional & scientific | 2013 |
| Rafford Films Limited | Arts & recreation | 1984 |
| Ragtel Consulting Limited | Information & communication | 2014 |
| Rainmaker Digital Limited | Information & communication | 2016 |
| Rbbb Professionals Limited | Professional & scientific | 2013 |
| Rebel Sports Ltd | Wholesale & retail | 2023 |
| Red Carpet Services Limited | Administrative & support | 2011 |
| Redden Court Road Limited | Real estate | 2014 |
| Regent Transportation LLP | | 2023 |
| REX Impex Limited | Arts & recreation | 2020 |
| Rexward Solutions Limited | Financial services | 2012 |
| RFF Investments Limited | Real estate | 2008 |
| RGK (Building Contractors) Limited | Construction | 1997 |
| Richard Bradley Motorsport LLP | | 2014 |
| RJ Luxury Limited | Transport & logistics | 2025 |
| Roam Financial Technologies Ltd | Information & communication | 2026 |
| Roam Holdings Ltd | Information & communication | 2026 |
| ROE Enterprises Limited | Other services | 2014 |
| Roplaro Ltd | Extraterritorial | 2019 |
| RSF Investments Limited | Real estate | 2008 |
| RSP OIL & GAS Consultants Limited | Professional & scientific | 2004 |
| Saca Limited | Professional & scientific | 2009 |
| Saca Nominees Limited | Administrative & support | 2010 |
| Sacrenova Ltd | Administrative & support | 2025 |
| Safaitte Limited | Professional & scientific | 2014 |
| Safjoh Limited | Health & social care | 2024 |