| MB Associates (Consulting) Limited | Construction | 2002 |
| Mcdonald Decorators Ltd | Construction | 2019 |
| Mclean Mortgage Services Limited | Financial services | 2021 |
| Mcmillan Creative Ltd | Professional & scientific | 2019 |
| Mdamc Accounting Ltd | Professional & scientific | 2022 |
| Meadow View Apartments Limited | Households | 2000 |
| Measure Check Limited | Construction | 2018 |
| MEB Properties Ltd | Real estate | 2023 |
| Mehta Brothers UK Limited | Wholesale & retail | 2013 |
| Mezzlogik Ltd | Information & communication | 2020 |
| MI Hart Ltd | Transport & logistics | 2022 |
| Mica Residential Ltd | Real estate | 2024 |
| Michael Lacey Limited | Information & communication | 2012 |
| Middlethorpe Interiors Ltd | Professional & scientific | 2010 |
| MJM Consultant Services Limited | Professional & scientific | 2019 |
| Molins U.K. Pension Fund Trustee Limited | Financial services | 1990 |
| Monumental Tiles Ltd | Wholesale & retail | 2022 |
| Moxon & Co Investments Limited | Financial services | 2019 |
| Moxon & Co Services Limited | Professional & scientific | 2019 |
| MT Group Yorkshire Ltd | Real estate | 2023 |
| MTM Fieldsports Ltd | Agriculture & fishing | 2024 |
| Mulberry Mews (Church Fenton) Management Company Limited | Households | 2002 |
| Musical Moments Franchises (UK) Ltd | Administrative & support | 2016 |
| MW Finops Ltd | Professional & scientific | 2019 |
| NE Gunn Ltd | Administrative & support | 2022 |
| Nembhard Business Services Ltd | Administrative & support | 2025 |
| Netsuite-Consulting Ltd | Professional & scientific | 2021 |
| Network Integration Technologies Ltd | Information & communication | 2007 |
| Neu-Era Ltd | Construction | 2019 |
| New Casa Ltd | Real estate | 2020 |
| Newco 240417 Limited | Real estate | 2017 |
| Newgate Sporting Limited | Arts & recreation | 2021 |
| Newmason Properties Limited | Professional & scientific | 2002 |
| Newtech Electrical Solutions Limited | Construction | 2017 |
| Nexgen Cabling Ltd | Construction | 2025 |
| NGF Doors Ltd | Extraterritorial | 2012 |
| Niamh Media Limited | Professional & scientific | 2024 |
| Northern Touch Limited | Hospitality | 1997 |
| Northgate Digital Limited | Information & communication | 2026 |
| Northmark Solutions Ltd | Real estate | 2025 |
| Oak and Edge Flooring Ltd | Construction | 2026 |
| Oakwood Joinery & Construction Limited | Construction | 2022 |
| Octopus Sourcing Ltd | Wholesale & retail | 2024 |
| Oglethorpe Management Company Limited | Real estate | 2006 |
| Ojmh Properties Limited | Real estate | 2021 |
| Old Innserve Limited | Manufacturing | 2003 |
| Oldfield Construction (Leeds) Limited | Construction | 2013 |
| OM Digital Development Ltd | Administrative & support | 2023 |
| One Day Creative Limited | Education | 2013 |
| Onecote Ltd | Administrative & support | 2022 |
| Only Kiosks Limited | Wholesale & retail | 2016 |
| Onyx Studio LMP Services Ltd | Administrative & support | 2026 |
| Orchards Properties Limited | Real estate | 2017 |
| OUT the Attic Productions Ltd | Arts & recreation | 2019 |
| Owen Scott Limited | Manufacturing | 2010 |
| P C E Homes Ltd | Construction | 2025 |
| P R Electrical Services Limited | Construction | 2016 |
| P4P Energy Solutions Limited | Energy | 2025 |
| Padl Consulting Ltd | Professional & scientific | 2022 |
| Panacare Clinic Ltd | Health & social care | 2026 |
| Park Connect Group Limited | Professional & scientific | 2026 |
| Park Farm Machinery Limited | Manufacturing | 1993 |
| Parnaby Construction and Maintenance Ltd | Administrative & support | 2014 |
| Parnaby Projects Limited | Construction | 2024 |
| Patrick Wynn Consultancy Limited | Professional & scientific | 2023 |
| PDL Payment Solutions Limited | Administrative & support | 2020 |
| Peach’S Pals Limited | Agriculture & fishing | 2024 |
| Pearce Bottomley Architects Ltd | Professional & scientific | 2025 |
| Pearce Bottomley LLP | | 2012 |
| Peony & Promise by Chloe Ltd | Arts & recreation | 2026 |
| Performance Glass Installations Ltd | Construction | 2019 |
| Performance Special Processes Ltd | Manufacturing | 2023 |
| Pesnique Limited | Health & social care | 2017 |
| Peter Jesty Consulting Limited | Information & communication | 2001 |
| Peter Wood Software Limited | Information & communication | 2010 |
| Phairdus Ltd | Transport & logistics | 2021 |
| Phascresh Ltd | Transport & logistics | 2021 |
| Pheixetheus Ltd | Administrative & support | 2021 |
| Phurition Ltd | Transport & logistics | 2021 |
| Pinkies (Boston Spa) Limited | Other services | 2017 |
| Pj's Airport Transfers Ltd | Transport & logistics | 2023 |
| Pole Star Property Services Limited | Construction | 2017 |
| Precbelf Ltd | Administrative & support | 2021 |
| Precision Farm Services Ltd | Administrative & support | 2011 |
| Primcom Transport Ltd | Wholesale & retail | 2018 |
| Prime Anatomy Fitness and Nutrition Limited | Arts & recreation | 2023 |
| Prime Anatomy Fitness Ltd | Arts & recreation | 2020 |
| Prime Go Logistics Ltd | Transport & logistics | 2026 |
| Print INK Limited | Wholesale & retail | 1999 |
| Privatusx Ltd | Information & communication | 2025 |
| Project Execution Excellence Limited | Hospitality | 2012 |
| Propertysense UK Ltd | Real estate | 2003 |
| Pureform Studio Limited | Health & social care | 2025 |
| Quantum Aesthetics Limited | Health & social care | 2017 |
| Quantum MEP Limited | Construction | 2017 |
| Quattro Padel Ltd | Arts & recreation | 2025 |
| Radtronix Ltd | Other services | 2023 |
| Rangeballsdirect Ltd | Wholesale & retail | 2025 |
| Rangetronix Ltd | Other services | 2023 |
| Rawlings Property Maintenance Limited | Administrative & support | 2013 |