| Nice N Comfy Ltd | Wholesale & retail | 2023 |
| Nice Name Publishing Ltd | Information & communication | 2025 |
| Niche Environmental Services Ltd | Professional & scientific | 2020 |
| Nicholas Whistance Plumbing & Heating Limited | Construction | 2013 |
| Nicholson Court Residents Company Limited | Real estate | 1976 |
| Nick James Financial Planning Ltd | Financial services | 2026 |
| Nick Prosser Limited | Professional & scientific | 2013 |
| Nickal Properties Ltd | Real estate | 2020 |
| Nicky Grist Motorsports Limited | Wholesale & retail | 1994 |
| Nicola's School of Dance Limited | Other services | 2012 |
| Nieuwburgh UK Limited | Administrative & support | 2010 |
| Nigel R J Priddey Ltd | Professional & scientific | 2018 |
| Nilda Investments Limited | Real estate | 2017 |
| Nimble Direct Limited | Construction | 2023 |
| Nimrod Preservation Group XV232 C.I.C. | Arts & recreation | 2016 |
| Nina Manandhar Ltd | Professional & scientific | 2014 |
| Nirvana Rental Homes UK Limited | Real estate | 2022 |
| Nizi Limited | Manufacturing | 2019 |
| NJL Stone Solutions Ltd | Construction | 2015 |
| Nkiru Investment Company Ltd | Real estate | 2021 |
| NO. 1 Garage Equipment Limited | Wholesale & retail | 1997 |
| NO. 28 Fabrics & Interiors Ltd | Wholesale & retail | 2015 |
| NO.8 Bayview | Households | 2021 |
| NO33 Business Consultancy Ltd | Professional & scientific | 2019 |
| NOA Builders Limited | Construction | 2013 |
| Noah Ancienne Ltd | Wholesale & retail | 2023 |
| Nolan Technical Services Ltd | Professional & scientific | 2026 |
| Nomendo Ltd | Health & social care | 2017 |
| Nominas (UK) Limited | Information & communication | 2012 |
| Nordic Filtration UK Limited | Administrative & support | 2024 |
| Norris Design Consultancy Ltd | Professional & scientific | 2016 |
| Norseman Developments Ltd | Wholesale & retail | 2023 |
| Northcrest Financial Planning Ltd | Financial services | 2024 |
| Northend Homes Ltd | Real estate | 2018 |
| Northend Strategies Ltd | Information & communication | 2025 |
| Northern Calling Ltd | Real estate | 2020 |
| Northolme Community Centre Association | Other services | 2005 |
| Northwood (Hereford) Limited | Real estate | 2010 |
| Norton Hall Farms Limited | Agriculture & fishing | 2005 |
| Norton Office Cleaning Ltd | Water & waste | 2007 |
| Nosati Limited | Information & communication | 2024 |
| Note Business Services Ltd | Real estate | 2020 |
| Noted Fashion Limited | Wholesale & retail | 2013 |
| Novo Property Investments Limited | Real estate | 2014 |
| NOW Creatives Ltd | Information & communication | 2018 |
| NOW Precision Limited | Professional & scientific | 2025 |
| NRB ENT Limited | Other services | 2013 |
| Nsrb Ltd | Information & communication | 2025 |
| NSS Retail Ltd | Wholesale & retail | 2026 |
| NTS Building & Restoration Ltd | Construction | 2017 |
| Number 37 Limited | Real estate | 2016 |
| Nurture & Joy Ltd | Health & social care | 2024 |
| Nurturing ND Limited | Education | 2023 |
| Nurturing Parents Ltd | Health & social care | 2021 |
| Nutravo Limited | Wholesale & retail | 2026 |
| Nuts and Bolts IT Ltd | Information & communication | 2011 |
| NW Construction (Hereford) Ltd | Construction | 2024 |
| NY Mantra Ltd | Real estate | 2025 |
| Nzap Limited | Professional & scientific | 2017 |
| O R Estates Limited | Real estate | 2021 |
| O'Leary Properties Limited | Real estate | 2017 |
| O'Neill Psychology Consulting Ltd | Health & social care | 2020 |
| Oak Floor IT Ltd | Construction | 2008 |
| Oak Gable Limited | Real estate | 2017 |
| Oak Lodge Chiropractic Ltd | Health & social care | 2002 |
| Oakchurch Farm Shop LLP | | 2016 |
| Oakdene Housing Limited | Real estate | 2015 |
| Oakfield Poultry Limited | Agriculture & fishing | 2010 |
| Oaklands (Hereford) Limited | Transport & logistics | 2013 |
| Oaklands Farm Park Limited | Agriculture & fishing | 2021 |
| Oakley Orthopaedic Services Ltd | Health & social care | 2010 |
| Oakleys Professional Limited | Professional & scientific | 2016 |
| Oaktree Caravan, Lodge & Park Homes Sales Ltd | Manufacturing | 2025 |
| Oakview Close Much Dewchurch Limited | Households | 2022 |
| Oakwrights Developments Limited | Construction | 2005 |
| Oakwrights Holding Ltd | Financial services | 2023 |
| Obidom Health Global Ltd | Health & social care | 2025 |
| Obligace Ltd | Professional & scientific | 2020 |
| Occultus Aeternus Ltd | Wholesale & retail | 2020 |
| Ocle Mead Management Company Limited | Households | 2007 |
| Octaga Group Ltd | Administrative & support | 2006 |
| Octaga Security Services Ltd | Administrative & support | 2006 |
| ODI Group Limited | Real estate | 2017 |
| Ody's Workforce Ltd | Hospitality | 2024 |
| Odyssey Lodge & Park Homes Ltd | Manufacturing | 2021 |
| OF Advertising Ltd | Professional & scientific | 2020 |
| OF the Land Properties Ltd | Real estate | 2019 |
| Office Support Limited | Information & communication | 1997 |
| Offshore Turbine Services Limited | Transport & logistics | 2011 |
| Offshore Turbine Vessels Limited | Extraterritorial | 2011 |
| Ogeon Ltd. | Information & communication | 2020 |
| Ogmore Whitland Management Company Limited | Households | 2022 |
| OGW Limited | Construction | 2024 |
| OHA Holdings Limited | Financial services | 2023 |
| Ohaks Consults Limited | Health & social care | 2016 |
| OK Hamlet Ltd | Real estate | 2025 |
| Old Hall Fabrications Limited | Manufacturing | 2023 |
| Old Hopyard Management Company Limited | Households | 2023 |
| Old House Surveys Limited | Professional & scientific | 2018 |
| Old King Street Farm Limited | Transport & logistics | 2005 |