| Newport Shropshire Cycle Services Ltd | Wholesale & retail | 2026 |
| Newport Soft Play Ltd | Construction | 2023 |
| Newport Sporting Club ABC Ltd | Arts & recreation | 2025 |
| Newport Stays Ltd | Real estate | 2023 |
| Newport Store Ltd | Wholesale & retail | 1993 |
| Newport Support Network CIC | Health & social care | 2020 |
| Newport Tech Ltd | Wholesale & retail | 2021 |
| Newport Tech Services Ltd | Other services | 2025 |
| Newport Trade Sales Ltd | Wholesale & retail | 2024 |
| Newport Trading Services Ltd | Hospitality | 2018 |
| Newport Travel Solutions Ltd | Transport & logistics | 2017 |
| Newport Travels Ltd | Transport & logistics | 2022 |
| Newport Truck Park Limited | Transport & logistics | 2018 |
| Newport Wholesale Limited | Wholesale & retail | 2014 |
| Newport Worktop & Tiles Ltd | Manufacturing | 2026 |
| Newport Wraps & Tints Ltd | Wholesale & retail | 2025 |
| Newserve Ltd | Agriculture & fishing | 2017 |
| Newstell Properties Limited | Real estate | 2016 |
| Newstell Holdings Limited | Financial services | 2024 |
| Newton Court (Monmouth) Limited | Manufacturing | 2026 |
| Newview Consulting Services Ltd | Information & communication | 2022 |
| Newyouuk Ltd | Health & social care | 2026 |
| Nexava Limited | Construction | 2025 |
| Nexcore Systems Ltd | Manufacturing | 2026 |
| Nexgen Utility Management Ltd | Financial services | 2022 |
| Nexifie Limited | Manufacturing | 2026 |
| Nexon Properties Ltd | Real estate | 2024 |
| Next GEN Celebrations Ltd | Arts & recreation | 2025 |
| Next Generation Properties U.K Ltd | Real estate | 2019 |
| Next Generation Youth NP CIC | Health & social care | 2026 |
| Nextgen Aggregates Limited | Wholesale & retail | 2024 |
| Nextgen Recycling Limited | Water & waste | 2025 |
| Nextshift Staffing Ltd | Administrative & support | 2025 |
| Nexus Arts and Literature Ltd | Financial services | 2021 |
| Nexus Games Ltd | Information & communication | 2024 |
| Nexus Property Compass Ltd | Administrative & support | 2025 |
| Neyaz Crib Ltd | Other services | 2022 |
| NF Global Limited | Wholesale & retail | 2016 |
| NG Accounting & Payroll Ltd | Professional & scientific | 2016 |
| NG Services 1 Ltd | Construction | 2022 |
| NGT Heating & Plumbing Limited | Construction | 2018 |
| NHX Services Ltd | Construction | 2019 |
| NI Archery Ltd | Arts & recreation | 2016 |
| NI Isle of Wight Limited | Hospitality | 2019 |
| Niche Frames Europe Limited | Wholesale & retail | 1994 |
| Niche Hospitality Limited | Hospitality | 2015 |
| Niche Pens Limited | Wholesale & retail | 2006 |
| Niche Platform Limited | Professional & scientific | 2019 |
| Niche Property Holdings Ltd | Real estate | 2008 |
| Nicholas Coley Limited | Health & social care | 2016 |
| Nicholls Arms (Bridgend) Limited | Hospitality | 2016 |
| Nick Evans Promotions Limited | Arts & recreation | 2008 |
| Nick Podmore Ltd | Construction | 2025 |
| Nicky Adams Countrywear Ltd | Wholesale & retail | 2019 |
| Nicole-Rose Commercial Interiors Ltd | Construction | 2022 |
| Nicolyndscot Limited | Real estate | 2017 |
| Nidd Fire Protection Limited | Public administration | 2023 |
| Nidd Vale Construction Ltd | Construction | 2020 |
| Niddry Design Ltd | Manufacturing | 2024 |
| Nigel & Co Ltd. | Administrative & support | 2025 |
| Nigel Davies Accountants Limited | Extraterritorial | 2007 |
| Nigel Davies Limited | Professional & scientific | 2002 |
| Nigel Edwards Engineering Limited | Agriculture & fishing | 2010 |
| Nigel Larkin Ltd | Professional & scientific | 2019 |
| Nigel's Dairy Limited | Wholesale & retail | 2015 |
| Nigerians in Wales Association CIC | Other services | 2022 |
| Nikolas Tudosa Limited | Other services | 2016 |
| Niktina Consulting Ltd | Professional & scientific | 2024 |
| Nilc Ltd | Education | 2014 |
| Nilsson Commercials Ltd | Real estate | 2021 |
| Nilsson Property Group Ltd | Financial services | 2021 |
| Nilsson Residentials Ltd | Real estate | 2017 |
| Nimu Properties Limited | Real estate | 2025 |
| Nineteen 04 Ltd | Wholesale & retail | 2024 |
| Nipa HUT Ltd | Hospitality | 2018 |
| Nisha Patel Ltd | Professional & scientific | 2017 |
| Nisheriii Ltd | Wholesale & retail | 2024 |
| Nissi Healthcare Limited | Health & social care | 2014 |
| Niton Developments Limited | Construction | 2025 |
| Niton Holdings Limited | Real estate | 2025 |
| Niton Investments Limited | Real estate | 2025 |
| Niton Properties Limited | Real estate | 2025 |
| Nixon Automotive Services Ltd. | Wholesale & retail | 2015 |
| Niyods Beauty Salon Ltd | Other services | 2026 |
| NJC Construction Limited | Construction | 2014 |
| Njenuity Limited | Administrative & support | 2017 |
| Njweng Cleaning Service Ltd | Administrative & support | 2023 |
| Nkrish Limited | Wholesale & retail | 2020 |
| NL Scaffolding Ltd | Construction | 2026 |
| NL145 Ltd | Hospitality | 2024 |
| Nldb Hire Limited | Construction | 2025 |
| Nldin Mortgages Ltd | Financial services | 2017 |
| NMC Training Ltd | Education | 2022 |
| NNB Travels Ltd | Administrative & support | 2020 |
| NNC Structural Engineering Ltd | Manufacturing | 2019 |
| NO Limits Scaffolding Ltd | Construction | 2022 |
| NO More Mouldy Bins Limited | Administrative & support | 2019 |
| No-Comply. Newport. Limited | Arts & recreation | 2021 |
| NO.7 Newport Ltd | Households | 2023 |
| NO2 Augustan Ltd | Hospitality | 2019 |