| Newton's Tree Ltd | Information & communication | 2023 |
| Nexa Accounting Ltd | Professional & scientific | 2025 |
| Neximpact Ltd | Information & communication | 2024 |
| Nexon SCM Group Limited | Manufacturing | 2013 |
| Nexseal Pro Ltd. | Construction | 2023 |
| Next Chapter Business Investments Ltd | Administrative & support | 2021 |
| Next Chapter Relocations Ltd | Construction | 2025 |
| Next GEN Heating Solutions Ltd | Construction | 2021 |
| Next Generation IT Solutions Limited | Information & communication | 2025 |
| Next Generation Pro Football Academy Ltd | Arts & recreation | 2017 |
| Nexteq PLC | Information & communication | 2001 |
| Nexteq UK Limited | Wholesale & retail | 1969 |
| Nextera Build Ltd | Construction | 2025 |
| Nexton Ltd | Information & communication | 2024 |
| Nextora Digital Ltd | Professional & scientific | 2026 |
| Nextview Windows & Bi-Fold Doors Ltd | Manufacturing | 2022 |
| Nexus Cargo Handling Limited | Transport & logistics | 2016 |
| Nexxus Services Ltd | Wholesale & retail | 2024 |
| Nguyen Sale & Letting Ltd | Real estate | 2023 |
| NH Pension Limited | Financial services | 2025 |
| Nice to Feed YOU Ltd | Manufacturing | 2025 |
| Nicenclear Limited | Other services | 2023 |
| Niche Innovations Ltd | Manufacturing | 2023 |
| Nick Speditione Ltd | Transport & logistics | 2021 |
| Nicky's Workshop CIC | Education | 2019 |
| Nicolae-Ilinca Dumitru Ltd | Construction | 2023 |
| Nicsco Ltd | Information & communication | 2015 |
| Night Ride Ltd | Transport & logistics | 2025 |
| Nightlive Limited | Information & communication | 2024 |
| Nila Property Management Ltd | Real estate | 2025 |
| Nilax Builders Ltd | Construction | 2025 |
| Niledigital Limited | Professional & scientific | 2025 |
| Nimbus Consulo Limited | Information & communication | 2023 |
| Nina Events Ltd | Hospitality | 2025 |
| Nina Lehmann Ltd | Health & social care | 2021 |
| Nine Knots Aviation Ltd | Professional & scientific | 2025 |
| Ningni Ltd | Wholesale & retail | 2023 |
| Ninja-Zen Solutions Ltd | Administrative & support | 2019 |
| Nisa Lettings Limited | Hospitality | 2019 |
| Nisarti Ltd | Other services | 2025 |
| Nishk London Limited | Wholesale & retail | 2019 |
| Nitro Collection Limited | Wholesale & retail | 2025 |
| Nivitha Ltd | Hospitality | 2021 |
| NIZ Tech Autos Limited | Wholesale & retail | 2025 |
| NJH Surveying Limited | Construction | 2014 |
| Njie Services Ltd | Administrative & support | 2016 |
| Njkbd Limited | Construction | 2024 |
| NJP International Limited | Wholesale & retail | 2025 |
| NK Project Consulting Ltd | Information & communication | 2017 |
| NKG Bookkeeping Limited | Professional & scientific | 2020 |
| NKK Consultants Ltd | Professional & scientific | 2025 |
| NLC Express Ltd | Construction | 2022 |
| NM Motor Trade Ltd | Wholesale & retail | 2023 |
| NM Transport & Logistics Ltd | Transport & logistics | 2022 |
| Nm-Pf Limited Partnership | | 2020 |
| NMC Properties Ltd | Real estate | 2018 |
| NNP Investments Limited | Real estate | 2026 |
| NO.1 Catering Events Ltd | Hospitality | 2022 |
| NO.2 Hurst Road Horsham Limited | Households | 2020 |
| Noabu Ventures Limited | Professional & scientific | 2023 |
| Nobil Construction Ltd | Construction | 2014 |
| Noble Autolink Ltd | Wholesale & retail | 2026 |
| Noble Compare Parking Limited | Administrative & support | 2025 |
| Noble Green Limited | Construction | 2004 |
| Noble Isle Garments Limited | Wholesale & retail | 2026 |
| Noble Parking Ltd | Transport & logistics | 2022 |
| Noir Hospitality Ltd | Hospitality | 2026 |
| Nola Living Limited | Real estate | 2016 |
| Nomadic Home Limited | Real estate | 2020 |
| Nomads Training Club LLP | | 2025 |
| Noon Property's Ltd | Real estate | 2025 |
| Noor Cars Gatwick Limited | Wholesale & retail | 2024 |
| Noor Real Estates Ltd | Real estate | 2020 |
| Norcal Pool Supplies Limited | Wholesale & retail | 1976 |
| Nordmann U.K. Limited | Wholesale & retail | 1995 |
| Nordmann UK Group Holdings Ltd | Professional & scientific | 2011 |
| Norman Hobbs Limited | Wholesale & retail | 2001 |
| Normco Limited | Financial services | 2025 |
| Norput Promotions Limited | Other services | 2010 |
| Nortech Limited | Manufacturing | 1983 |
| North Cliff Group Ltd | Financial services | 2026 |
| North Down Construction Services Limited | Construction | 2015 |
| North Star Transfers Ltd | Transport & logistics | 2026 |
| Northcote Holdings Co Limited | Financial services | 2024 |
| Northdown Associates Limited | Professional & scientific | 1997 |
| Northgate Dental Care Limited | Health & social care | 2007 |
| Northgate Meze Ltd | Hospitality | 2026 |
| Northgate MOT Garage Ltd | Wholesale & retail | 2025 |
| Northgate Place Car Wash Ltd | Administrative & support | 2019 |
| Northguard Advisory Ltd | Information & communication | 2026 |
| Northline Apps Ltd | Information & communication | 2026 |
| Norvoir Ltd | Wholesale & retail | 2024 |
| Nosamax Consulting Limited | Information & communication | 2014 |
| Noskin Limited | Households | 1982 |
| NOT YET Final Studios Limited | Professional & scientific | 2026 |
| Nou:U Ltd | Administrative & support | 2016 |
| Noussa Limited | Health & social care | 2014 |
| Noventis Technology Limited | Wholesale & retail | 2026 |
| Novo Consulting Limited | Professional & scientific | 2023 |
| Novo IT Limited | Wholesale & retail | 2021 |