| NEO Next+ Energy Consolidated Holdings Limited | Aberdeen | 2023 |
| NEO Next+ Energy E&P North Sea UK Limited | London | 1998 |
| NEO Next+ Energy E&P UK Limited | London | 1964 |
| NEO Next+ Energy E.F. Limited | London | 1997 |
| NEO Next+ Energy ELF UK Limited | London | 1964 |
| NEO Next+ Energy Exploration UK Limited | London | 2012 |
| NEO Next+ Energy GT Limited | London | 2014 |
| NEO Next+ Energy Natural Resources Limited | London | 2020 |
| NEO Next+ Energy Offshore UK Limited | London | 1969 |
| NEO Next+ Energy Pathway Limited | London | 2007 |
| NEO Next+ Energy Petroleum Limited | London | 1996 |
| NEO Next+ Energy PUK Limited | London | 2019 |
| NEO Next+ Energy Upstream UK Limited | Aberdeen | 2005 |
| Neopem Ltd | London | 2017 |
| Neoterra Group PLC | London | 2005 |
| Nephtali AWE Holding Ltd | London | 2021 |
| Nepicar Sand Ltd | Dartford | 2008 |
| Neptune Inspection Services Ltd | Newcastle Upon Tyne | 2013 |
| Neptune OIL & GAS Limited | | 2002 |
| Neptune Subsea Engineering Ltd | Aberdeen | 2002 |
| Neptune Subsea Ltd | Charlbury | 2011 |
| NES Energy Ltd | London | 2019 |
| Ness Castle Engineering Ltd | Inverness | 2020 |
| Netha Industrial Services Limited | Westhill | 2026 |
| Netherlands Ailibu Crop Nutrition Ltd | Cardiff | 2026 |
| Netherlands Ames Plant Nutrition Co., Ltd | London | 2024 |
| Netherlands Basf Mining Co., Ltd | Stafford | 2024 |
| Netherlands Bellom Chemical Group Co. Ltd | Beckenham | 2024 |
| Netherlands Bendem Biochemistry Co., Ltd | Cambridge | 2026 |
| Netherlands Casella International Group Ltd | Cambridge | 2020 |
| Netherlands Chemical Mining Co., Ltd | Cardiff | 2026 |
| Netherlands Groen Vicens Horticulture Co., Ltd | Cambridge | 2025 |
| Netherlands Gros International Plant Nutrition Co., Ltd | Cambridge | 2024 |
| Netherlands Heyihuang International Chemical Co., Ltd | Cambridge | 2025 |
| Netherlands Jiashi LAI Crop Nutrition Co., Ltd | Cambridge | 2026 |
| Netherlands Jinfali Agricultural Group Co., Ltd | Cambridge | 2026 |
| Netherlands Lubaloe Co., Ltd | Cardiff | 2026 |
| Netherlands Mingyuan International Biotechnology Co., Ltd | West Midlands, England | 2023 |
| Netherlands Power Ship Crop Nutrition Co., Ltd | Cardiff | 2022 |
| Netherlands Shreefon International Trade Agrochemical Co., Ltd | London | 2024 |
| Netherlands Volta International Industrial Group Co., Ltd | London | 2024 |
| Netherlands Yadi International Horticulture Co., Ltd | Cardiff | 2021 |
| Netherlands Zhongnuo Co., Ltd | Cardiff | 2026 |
| Netoil Environmental Technologies Limited | London | 2022 |
| Network Stratigraphic Consulting Limited | Aylesbury | 1994 |
| Nevadic Limited | Liverpool | 2020 |
| Nevitte Materials Engineering Ltd | Coventry | 2011 |
| New AGE UK Limited | London | 2007 |
| New Crofton Co-Op Colliery Limited | Leeds | 2012 |
| New Dawn Metals Limited | London | 2019 |
| New Elgin Services Ltd | Elgin | 2021 |
| New Forest Engineers Limited | London | 2013 |
| New Generation Minerals Limited | London | 2018 |
| New Luting Chemical Co., Ltd | Cambridge | 2025 |
| New MED Energy PLC | Bristol | 2021 |
| New Milton Sand and Ballast Limited | Hampshire | 1957 |
| New Mountain Ventures Ltd | London | 2018 |
| New Park Quarry Ltd | Gainsborough | 2022 |
| New World Resources PLC | Brighton | 2011 |
| Newbiggin Hall Farm Ltd | Pickering | 2012 |
| Newbiggin Hall Ltd | Pickering | 2012 |
| Newby Gravel Limited | Ripon | 2012 |
| Newell Aggregates Limited | Co Down | 2003 |
| Newell Sand & Gravel Ltd | River House Home Avenue | 2007 |
| Newmed Energy Balkan Limited | Altrincham | 2024 |
| Newmed Energy UK Limited | London | 2019 |
| Newport Habitat Solutions Ltd | Dundee | 2017 |
| Newthorpe Aggregates Limited | Pocklington | 2016 |
| Newton Moor Farms Ltd | Whitby | 2012 |
| Newton OIL and GAS Ltd | Ewell | 2016 |
| Nexara Energy Ltd | London | 2025 |
| Nexgas Limited | Buckinghamshire | 2003 |
| Nexhr Ltd | Beckenham | 2014 |
| Next-Gen Fuels UK Ltd | Mansfield | 2022 |
| Nextsource U.K. Limited | London | 2024 |
| NFG Logistics Ltd | Peterhead | 2018 |
| Ngualla Group UK Limited | Newcastle Upon Tyne | 2021 |
| NGX Exploration UK Limited | Newcastle Upon Tyne | 2021 |
| NGX Kenya Exploration UK Limited | Newcastle Upon Tyne | 2024 |
| NGX Mining UK Limited | Newcastle Upon Tyne | 2021 |
| NGX Uranium Exploration UK Limited | Newcastle Upon Tyne | 2024 |
| Nharo Ltd | Poole | 2021 |
| NHX Ltd | Reading | 2018 |
| Nibaz Metals Limited | Gillingham | 2024 |
| Nicholson Well Services Ltd | Aberdeen | 2025 |
| Nick Crabtree Limited | Hove | 2015 |
| Nick Hatch Mining Advisory Ltd | London | 2018 |
| Nick Sayers Geological Services Limited | Charmouth | 2014 |
| Nicol Aggregates Limited | Westhill | 2017 |
| Nidd Valley Stone Limited | Harrogate | 2008 |
| Nigel Dennis Swain Limited | Exeter | 2024 |
| Nighty Rose General Trade Ltd | London | 2025 |
| Nile Business Services Ltd | Bedford | 2018 |
| Nimba Development Company PLC | London | 2022 |
| Nimba Development Holdings Limited | London | 2021 |
| Nimbus Energy Limited | Haywards Heath | 2017 |
| Nine Chiswest Limited | Swanland | 2013 |
| Nine Foot Offshore Limited | Lowestoft | 2013 |
| Ninetyfold Slang Field Ltd | Lichfield | 2015 |
| Niocorp Technologies Limited | London | 2023 |