| Morton House Interiors Ltd | Wholesale & retail | 2020 |
| Motor Racing Logistics Ltd | Administrative & support | 2012 |
| Mouchak Balti Limited | Hospitality | 2025 |
| MSR Performance Wheels & Tyres Ltd | Wholesale & retail | 2022 |
| Mtis Limited | Professional & scientific | 2003 |
| Mudreas Ltd | Transport & logistics | 2019 |
| My Cookie Club (UK) Ltd | Wholesale & retail | 2018 |
| My Vehicle Ltd | Wholesale & retail | 2021 |
| Myinsideout Limited | Construction | 2020 |
| N a Khera Holdings Ltd | Financial services | 2023 |
| N a Khera Properties Ltd | Real estate | 2023 |
| N.C. Spencer Holdings Limited | Real estate | 1998 |
| Naden Interim Limited | Professional & scientific | 2011 |
| Nairn Properties Limited | Real estate | 2018 |
| Naisen Build Ltd | Construction | 2025 |
| Namco Tooling Limited | Manufacturing | 1984 |
| Natupharma UK Limited | Wholesale & retail | 2011 |
| NCA Contracts Limited | Construction | 2019 |
| NDA Recycling Limited | Water & waste | 2009 |
| Neil Hoare Consulting Limited | Professional & scientific | 2026 |
| NET Ballers Club Ltd | Education | 2024 |
| Netthreat Limited | Administrative & support | 2009 |
| Neuralzith Ltd | Administrative & support | 2024 |
| New Moon Facilities Management Ltd | Professional & scientific | 2003 |
| New Start Properties Ltd | Real estate | 2020 |
| Newman Way Management Company Ltd | Households | 2022 |
| NH Bathroom Fitting Ltd | Construction | 2026 |
| NH Plumbing Services Ltd | Construction | 2023 |
| Nicton Limited | Wholesale & retail | 2005 |
| Nigel Reuben Racing Limited | Manufacturing | 2026 |
| Night OWL Holdings Limited | Hospitality | 2021 |
| NJ Rose Building & Carpentry Ltd | Construction | 2018 |
| NLE Building & Landscaping Ltd | Construction | 2024 |
| NME (NME) Limited | Professional & scientific | 2007 |
| NME (SBW) Limited | Professional & scientific | 2007 |
| NO Dog Grooming Here Ltd | Agriculture & fishing | 2020 |
| NO.10 Coffee Ltd | Wholesale & retail | 2021 |
| Nomuda Holding Limited | Information & communication | 2019 |
| Nomuda Limited | Information & communication | 1998 |
| Nomuda Property Limited | Real estate | 2024 |
| Northern Minerals and Estates Limited | Real estate | 1912 |
| Nothing BUT the Grape Limited | Wholesale & retail | 2011 |
| Nothing BUT the Grape London Limited | Hospitality | 2014 |
| Novelsleepy Ltd | Transport & logistics | 2019 |
| Number 6 Church Street Alcester Limited | Households | 2024 |
| Nxumalo Global Limited | Health & social care | 2014 |
| O'Mahony Holdings Ltd | Financial services | 2024 |
| Oakland Hill Park Home Estate Limited | Hospitality | 2014 |
| Oatley Broker Services Ltd | Financial services | 2024 |
| October Investigations Limited | Administrative & support | 2015 |
| Odell Electrical Services Limited | Construction | 2025 |
| Odtaa Ltd | Administrative & support | 2020 |
| Odyssa Limited | Construction | 2026 |
| Odyssey Property Group Ltd | Real estate | 2022 |
| Office Impressions Limited | Professional & scientific | 2003 |
| Office Impressions UK Limited | Administrative & support | 2005 |
| OH SO LOW Ltd | Wholesale & retail | 2023 |
| OHI Consulting Ltd | Education | 2022 |
| Ohms & Watts Limited | Transport & logistics | 1995 |
| OJH Heating & Plumbing Ltd | Construction | 2024 |
| Onlinecalendarshop.Com Limited | Wholesale & retail | 2006 |
| Onsite Construction Warwickshire Ltd | Construction | 2011 |
| Open PEN Ltd | Information & communication | 2025 |
| Optimise Performance Ltd | Education | 2023 |
| Optimum Scaffolding Ltd | Construction | 2019 |
| OPV Capital Ltd | Financial services | 2026 |
| Orangemabel Stratford Ltd | Hospitality | 2017 |
| Osmor Products Limited | Manufacturing | 1988 |
| Ouisel Ltd | Information & communication | 2017 |
| OUT to Launch Ltd | Professional & scientific | 2019 |
| Outreach Property Investments Limited | Construction | 2024 |
| Oversley Limited | Financial services | 2019 |
| Oversley Property Development Limited | Construction | 2017 |
| Owen Property Ventures Limited | Construction | 2025 |
| Oxford Property Renovations Limited | Construction | 2009 |
| P & N Decorators Limited | Construction | 2019 |
| P & R Mueller Master Builders Limited | Construction | 2025 |
| P Owen Plumbing and Heating Ltd | Construction | 2014 |
| P.A. Ryder Ltd | Health & social care | 2000 |
| Padgets Management Limited | Real estate | 1988 |
| Pallas Logistics Ltd | Transport & logistics | 2026 |
| Paracosmic Worlds Limited | Information & communication | 2021 |
| Paramount Performance Automotive Development Limited | Wholesale & retail | 2014 |
| Pardus Capital Limited | Professional & scientific | 2017 |
| Partners in Produce Limited | Professional & scientific | 2012 |
| Partridge Ventures Limited | Professional & scientific | 2026 |
| Pathlight Communications Ltd | Professional & scientific | 2020 |
| Pattern Marketing Ltd | Professional & scientific | 2018 |
| Patty Smashers Limited | Hospitality | 2022 |
| Paul Bailey Limited | Construction | 2003 |
| Paul Montgomery Services Limited | Financial services | 2011 |
| Paula Mitchell Healthcare Consultancy Ltd | Health & social care | 2022 |
| Payne & Co. (Electrical Contractors) Limited | | 1970 |
| PCSK9 Education and Research Forum | Information & communication | 2013 |
| PDC Motor Company Ltd | Wholesale & retail | 2023 |
| Peach Beer Ltd | Information & communication | 2019 |
| Peak Pet Products Ltd | Wholesale & retail | 2015 |
| Peplow Marine Limited | Arts & recreation | 2011 |
| Peregrine Business Advisory Ltd | Professional & scientific | 2025 |
| Perry Brunn Limited | Professional & scientific | 2021 |