| Newton Valence Farms Limited | Hampshire | 1982 |
| Newton-By-Usk Limited | Brecon | 2010 |
| Newton-In-The-Isle Vineyard Limited | Ely | 2024 |
| Newtoncroft Farms Limited | London | 2013 |
| Newtonhead Farm Ltd | Kilmarnock | 2018 |
| Newtons Farms Limited | Knaresborough | 2020 |
| Newtons Tree Services Limited | Oxted | 2024 |
| Newtrench Limited | Northumberland | 1986 |
| Newtyle Bulb and Farming Company Limited | | 1946 |
| Newtyle Salmon Fishing Limited | Dunkeld | 2023 |
| Nexatone Limited | Shipley | 2023 |
| Next Chapter Stallions Ltd | Stafford | 2024 |
| Next Day Hedges Ltd | Holywell | 2017 |
| Next Globalbiz Limited | London | 2010 |
| Next Level Dog Training Ltd | Mansfield | 2023 |
| Nextar Plant Nutrition Co., Limited | Cardiff | 2021 |
| Nextgenmastifftraining Ltd | Droitwich | 2023 |
| Nextleaf Produce Ltd | London | 2025 |
| Nextsource Industries Ltd | Chalgrove | 2023 |
| Nexus Aquaculture Ltd | Falkirk | 2023 |
| Nexus Systems Engineering Ltd | Birmingham | 2026 |
| NF Cheshire Limited | Winsford | 2013 |
| Nfiniteheart Eco Sanctuary Ltd | London | 2023 |
| NFP Forestry Ltd | Reigate | 2021 |
| NG Arable Limited | North Dalton | 2024 |
| NG North Limited | Glasgow | 2025 |
| Ngag Biotech Ltd | Lymington | 2025 |
| NGB Fisheries Ltd | West Yorkshire | 2006 |
| Ngier Ltd | Bristol | 2011 |
| Nhrt Limited | Hatfield | 2005 |
| NI Environmental Ltd | Magherafelt | 2023 |
| NI Farming Ltd | Newtownards | 2023 |
| NI Fishing Limited | Broughty Ferry | 2023 |
| NI Forestview Farm Ltd | Newtownabbey | 2022 |
| NI Horticultural Growers Ltd | Caledon | 2025 |
| NI Horticulture PO Limited | Moy | 2025 |
| NI Paws Limited | Belfast | 2025 |
| NIA Limited | Dorking | 1995 |
| Niab EMR | Cambridge | 2015 |
| Niab Trading Ltd | Cambridge | 2010 |
| Niab. | Cambridge | 1997 |
| Niall & Jennifer Morgan Ltd | Castlewellan | 2016 |
| Niall Eoin Campbell Ltd | Glasgow | 2022 |
| Nialls Farm Ltd | Airdrie | 2016 |
| Nibbleweight Limited | Nottingham | 2026 |
| NIC Ruaidhrí Ltd | Enniskillen | 2020 |
| Nice Green Farm Ltd | Sheffield | 2020 |
| Nicholas Farms (Swindon) Limited | Wanborough | 2007 |
| Nicholaston Farm Ltd | Swansea | 2015 |
| Nicholls and SON Scaffolding Limited | Westerham | 2019 |
| Nicholls Estates Ltd | Frome | 2023 |
| Nichols & Sons Ltd | Sutton | 2014 |
| Nichols Farming Limited | Tetbury | 2017 |
| Nichols Forest Ltd | Altrincham | 2026 |
| Nichols Moss Partners Ltd | Grange Over Sands | 2010 |
| Nichols Wood Ltd | Grange Over Sands | 2024 |
| Nicholson Forest Management Ltd | Inverness | 2022 |
| Nicholson Jones Farming Limited | Redditch | 1993 |
| Nicholson Nurseries Limited | Bicester | 2003 |
| Nick Bradley Bloodstock Limited | Goxhill | 2011 |
| Nick Brown (Carlisle) Limited | Carlisle | 2017 |
| Nick Edwards Contracts Limited | Newcastle Under Lyme | 2006 |
| Nick Horn Ltd | Eastleigh | 2018 |
| Nick Mills Forestry Limited | Alton | 2008 |
| Nick O'Sullivan Registered Farrier Services Ltd | Liverpool | 2017 |
| Nick Partridge (Farriers) Limited | Worcester | 2007 |
| Nick Price Farming Ltd. | Cirencester | 2003 |
| Nick Wickett Hoofcare Ltd | Liskeard | 2015 |
| Nickolas Chopping Limited | London | 2013 |
| Nickrick Ltd | Coventry | 2009 |
| Nicks & Company(Timber)Limited | Gloucester | 1960 |
| Nicks Green Trees Limited | Harrow | 2026 |
| Nicky Hill Eventing Ltd | London | 2024 |
| Nick`S Shoes Ltd | Wells | 2009 |
| Nico Polo Ltd | Guildford | 2018 |
| Nicol Fishing Limited | Gardenstown | 1999 |
| Nicol Ritchie Fishing Ltd. | Banff | 2013 |
| Nicol Solutions Limited | Huntly | 2023 |
| Nicolson Contracting Ltd | Kelso | 2024 |
| Nidderdale Lavender Limited | Harrogate | 2026 |
| Nifff Ltd | Armagh | 2021 |
| Nigandra Farms Limited | Beverley | 1981 |
| Nigekin Equestrian Ltd | Swindon | 2022 |
| Nigel Allam Consultancy Limited | Dudley | 2014 |
| Nigel Earley Services Limited | Yafford | 2014 |
| Nigel Edwards Engineering Limited | Newport | 2010 |
| Nigel Hull Fishing Company Limited | Middlesbrough | 2018 |
| Nigel Phillips Contracting Services Limited | Northallerton | 2016 |
| Nigel Stead Fishing Limited | Grimsby | 2002 |
| Nigelmclaughlin Ltd | Dungiven | 2004 |
| Nightingale Farm Estate Ltd | Southam | 2024 |
| Nightingale Farm Services (Whittlesey) Limited | Peterborough | 1965 |
| Nightingale Ground Care Ltd | Southampton | 2006 |
| Nightingale Investment Management Limited | Cowbridge | 2016 |
| Nightingale Kennels Limited | Eastbourne | 2024 |
| Nightingale Nursery Ltd | Chandlers Ford | 2019 |
| Nightlayer Leek Company Ltd. | Chatteris | 1987 |
| Niguk Ltd | Reading | 2021 |
| NIK Woods Tree Services Limited | Waterlooville | 2012 |
| Nika Farms Ltd | Bilston | 2025 |