| NDM Retailing Limited | Wholesale & retail | 2003 |
| Ndoro Services Limited | Health & social care | 2015 |
| NDS Power Services Ltd | Energy | 2021 |
| NDT Resources Ltd | Administrative & support | 2015 |
| Near Vision Limited | Arts & recreation | 2022 |
| Nearheath Limited | Extraterritorial | 1984 |
| Neatt Product Design Ltd | Professional & scientific | 2020 |
| Necs the Courier Ltd | Transport & logistics | 2021 |
| Need a Hand 365 Limited | Other services | 2019 |
| Needhams Building Contractors (Swindon) Ltd | Other services | 2017 |
| Needlefresh Direct Limited | Wholesale & retail | 1995 |
| Neel Goods Ltd | Wholesale & retail | 2026 |
| Nefca Limited | Arts & recreation | 2007 |
| Nehar Tandoori Ltd | Hospitality | 2025 |
| Neil & Joanna Property Development Limited | Real estate | 2024 |
| Neilson Boxing Ltd | Arts & recreation | 2016 |
| Neitiv Ltd. | Manufacturing | 2019 |
| Nelma's Pizza Ltd | Hospitality | 2022 |
| Nelson House RTM Company Ltd | Households | 2017 |
| Nelsonhealth Ltd | Extraterritorial | 2025 |
| Nenis Clearspace Ltd | Administrative & support | 2025 |
| Nenkan Ltd | Real estate | 2024 |
| NEO Parent Connect Ltd | Health & social care | 2025 |
| Neoma Landscape Garden Design and Water Features Limited | Administrative & support | 2019 |
| Neon Dance Limited | Arts & recreation | 2020 |
| Neon Homes LLP | | 2013 |
| Neon Nelly Limited | Professional & scientific | 2008 |
| Nepal Foods and Exports Ltd | Wholesale & retail | 2025 |
| Neptune (Europe) Ltd | Wholesale & retail | 1996 |
| Neptune Holdco Limited | Professional & scientific | 2013 |
| Neptune Retail Limited | Wholesale & retail | 2005 |
| Nerogreen Estates Ltd | Real estate | 2024 |
| Nerogreen Ltd | Financial services | 2023 |
| Nerogreen Solutions Ltd | Information & communication | 2016 |
| Nesan Consultants Limited | Information & communication | 2010 |
| Nesan Networks Limited | Information & communication | 2016 |
| Nesan Properties & Investments Limited | Real estate | 2016 |
| Nest Children's Homes Limited | Health & social care | 2024 |
| Neston Services Limited | Information & communication | 2025 |
| Nestor Contracting Ltd | Construction | 2019 |
| Nestura Housing CIC | Hospitality | 2025 |
| NET M@Rket Ltd | Administrative & support | 2019 |
| NET Zero 2030 Ltd | Wholesale & retail | 2022 |
| Netcove Limited | Professional & scientific | 2025 |
| Netflats Ltd | Professional & scientific | 2018 |
| Netina Limited | Health & social care | 2026 |
| Netintent.Co.Uk Limited | Information & communication | 2001 |
| Netsense Consultancy Ltd | Information & communication | 2023 |
| Network Studios Limited | Professional & scientific | 2021 |
| Networked Media CPO Interactive Limited | Information & communication | 2011 |
| Neurodiversity Solutions Ltd | Health & social care | 2020 |
| Neutron Alloys Limited | Wholesale & retail | 2012 |
| Nevada Mist Limited | Professional & scientific | 2016 |
| New Atlantis | Information & communication | 1996 |
| New Balbinka Swindon Ltd | Wholesale & retail | 2024 |
| New Bassett Spice Ltd | Hospitality | 2026 |
| New Bollards Ltd | Transport & logistics | 2013 |
| New Branch Holdings Limited | Arts & recreation | 2025 |
| New Build Kitchen Installations Ltd | Construction | 2022 |
| New Building Solution Ltd | Construction | 2020 |
| New Business Online Limited | Manufacturing | 2019 |
| New China Garden (Trowbridge) Limited | Real estate | 2021 |
| New College Swindon Services Limited | Education | 2022 |
| New Culture Homes Ltd | Extraterritorial | 2020 |
| New Dawn UK Consultants Ltd | Administrative & support | 2015 |
| New Generation - Bond CIC | Health & social care | 2020 |
| New Home Surveying Limited | Construction | 2021 |
| New Kurdish Barber Ltd | Other services | 2024 |
| New Land Builds Ltd | Construction | 2016 |
| New Locks Limited | Administrative & support | 2011 |
| New Maritime Limited | Professional & scientific | 2008 |
| New Parking Solutions Limited | Administrative & support | 2009 |
| New Start Digital Ltd | Professional & scientific | 2023 |
| New Style Paving Limited | Construction | 2025 |
| New Wave Learning Limited | Information & communication | 2019 |
| New Wildlife Tours Limited | Administrative & support | 2017 |
| New Wongs (New Forest) Ltd | Hospitality | 2024 |
| New World Software Europe Limited | Information & communication | 2013 |
| Newb Road Store PVT Ltd | Wholesale & retail | 2025 |
| Newbright Property Development Ltd | Construction | 2018 |
| Newbright Property Lettings Ltd | Real estate | 2018 |
| Newbury Gateway Ltd | Construction | 2024 |
| Newcombe Beard (Land) Limited | Extraterritorial | 1973 |
| Newcombe Beard Limited | Real estate | 1998 |
| Newcote Limited | Professional & scientific | 2018 |
| Newcroft Electrics Ltd | Construction | 2022 |
| Newdai Properties Ltd | Administrative & support | 2025 |
| Newell Brown Ltd | Real estate | 2019 |
| Newland Plumbing and Heating Limited | Construction | 2009 |
| Newlands Carpentry and Joinery Ltd | Construction | 2026 |
| Newman Enterprises (Sales) Limited | Wholesale & retail | 1998 |
| Newport Street (Swindon) Management Company Limited | Households | 2017 |
| Newson Interiors Limited | Construction | 2000 |
| Newtons LSM Ltd | Real estate | 2016 |
| Nexfab Ltd | Information & communication | 2016 |
| Nexgen Landscaping Ltd | Administrative & support | 2024 |
| Nexgen Windows Limited | Wholesale & retail | 2019 |
| Nexora Installations Ltd | Construction | 2026 |
| Next GEN Ecommerce Limited | Information & communication | 2019 |
| Next Generation Automotive Ltd | Professional & scientific | 2022 |