| Newacore Tech AI Ltd | Information & communication | 2008 |
| Newbridge Law Ltd | Professional & scientific | 2024 |
| Newco 0114 Limited | Other services | 2014 |
| Newfoundland Holdings Ltd | Financial services | 2023 |
| Newgen Furniture Ltd | Wholesale & retail | 2023 |
| Newhaven Care Limited | Health & social care | 2017 |
| Newka Designs Ltd. | Professional & scientific | 2018 |
| Newlaw Estates Limited | Administrative & support | 2008 |
| Newline Trading Limited | Financial services | 2013 |
| News Box Watford Limited | Wholesale & retail | 2025 |
| Newtech Investments Ltd | Financial services | 2016 |
| Newton London Limited | Transport & logistics | 2024 |
| Nexa AI ERP Ltd | Information & communication | 2025 |
| Nexa MAX Garages Ltd | Wholesale & retail | 2024 |
| Nexalink Ltd | Professional & scientific | 2023 |
| Nexalogic Ltd | Information & communication | 2025 |
| Nexen Security Services Ltd | Administrative & support | 2022 |
| Nexgen Plumbing Solutions Ltd | Construction | 2025 |
| Nexgym Limited | Other services | 2025 |
| Nexilis Networks Ltd | Information & communication | 2019 |
| Nexlex Immigration UK Ltd | Professional & scientific | 2025 |
| Next Link Consortium Limited | Administrative & support | 2025 |
| Next Link Logistics Limited | Transport & logistics | 2025 |
| Nextgen 9 Ltd | Financial services | 2025 |
| Nextgen BMS Ltd | Construction | 2025 |
| Nextgen Care Homes Ltd | Health & social care | 2025 |
| Nextgen EDU Solutions Ltd | Professional & scientific | 2025 |
| Nextgen Holdco Ltd | Financial services | 2025 |
| Nextgen Ninja Ventures Limited | Education | 2026 |
| NEXTGEN5 Solutions Ltd | Wholesale & retail | 2025 |
| Nextgenz Engineers Limited | Education | 2025 |
| Nextlevelresources Ltd | Information & communication | 2016 |
| Nextphase Itsm Consultants Limited | Information & communication | 2026 |
| Nextprop Ltd | Real estate | 2020 |
| Nextroad Garage Ltd | Wholesale & retail | 2026 |
| Nextsoft Consultancy Limited | Administrative & support | 2015 |
| Nexus 13 Trading Ltd | Wholesale & retail | 2026 |
| Nexus Dynamics Support Limited | Information & communication | 2026 |
| Nexus Global Property Investments Ltd | Real estate | 2024 |
| Nexus Innovative Limited | Information & communication | 2016 |
| Nexus Realty London Limited | Real estate | 2022 |
| Nexus Soft Ltd | Information & communication | 2023 |
| Nfactorial Ltd | Real estate | 2020 |
| Nfdl Engineering Ltd | Information & communication | 2015 |
| Nfiniti Tech Ltd | Information & communication | 2026 |
| NGF Ltd | Professional & scientific | 2023 |
| Ngorli C.I.C. | Education | 2017 |
| Ngpr Limited | Professional & scientific | 2026 |
| Nhfuture Healthcare Ltd | Health & social care | 2024 |
| NHG Limited | Construction | 2015 |
| Nhhp Ltd | Health & social care | 2024 |
| Nhsa Medics Limited | Health & social care | 2013 |
| Niash Learning Lounge Ltd | Education | 2025 |
| Niati Limited | Real estate | 2023 |
| NIB Air Services Ltd | Energy | 2018 |
| Nibac Properties Limited | Real estate | 2018 |
| Nicely Done Contractors Limited | Construction | 2004 |
| Niche Skills Limited | Information & communication | 2022 |
| Nicholas Andrei Ltd | Construction | 2014 |
| Nicholas Beecroft Limited | Professional & scientific | 2017 |
| Nicholas Dale Limited | Arts & recreation | 2011 |
| Nick Cookie Ltd. | Professional & scientific | 2013 |
| Nick Hearn Production Management & Support Limited | Information & communication | 2018 |
| Nick Lowe Limited | Arts & recreation | 1980 |
| Nick Transport Ltd | Transport & logistics | 2016 |
| Nick's Accounting Services Limited | Professional & scientific | 2026 |
| Nickel Digital Asset Management Limited | Financial services | 2019 |
| Nicky Katz Ebbsfleet Limited | Financial services | 2025 |
| Nicol Heating Services Ltd | Construction | 2020 |
| Nicola Start Limited | Health & social care | 2011 |
| Nicu Joita Ltd | Transport & logistics | 2015 |
| Nidhit Limited | Administrative & support | 2012 |
| Niema Property Services Ltd | Real estate | 2025 |
| Nigel Court Management Limited | Real estate | 1971 |
| Nightingale Angels Ltd | Health & social care | 2022 |
| Nightingale Homecare Services Limited | Wholesale & retail | 2012 |
| Nightingale Research Limited | Information & communication | 2024 |
| Nigin Wigology Limited | Wholesale & retail | 2020 |
| Nijtech Consulting Ltd. | Information & communication | 2015 |
| NIK Stewart Limited | Professional & scientific | 2011 |
| Nila Care Ltd | Wholesale & retail | 2024 |
| Nilkanth Consultancy Limited | Professional & scientific | 2012 |
| Nilswami Ltd | Information & communication | 2016 |
| Nima Store Ltd | Wholesale & retail | 2021 |
| Nimble Starts Ltd | Information & communication | 2024 |
| Nimbus Global UK Ltd | Information & communication | 2022 |
| Nine Asset Management Limited | Real estate | 2013 |
| Nine Basingstoke Limited | Hospitality | 2015 |
| Nine Developments Limited | Real estate | 2013 |
| Nine Estates Limited | Hospitality | 2013 |
| Nine Gatwick Hotel Limited | Hospitality | 2017 |
| Nine Greenwich Hotel Limited | Hospitality | 2017 |
| Nine Heathrow Ventures Limited | Hospitality | 2014 |
| Nine Hills Limited | Construction | 2012 |
| Nine Hospitality 2 Limited | Extraterritorial | 2013 |
| Nine Hospitality 3 Ltd | Hospitality | 2014 |
| Nine Hospitality 4 Limited | Real estate | 2014 |
| Nine Hotel 2019 Hospitality Limited | Real estate | 2019 |
| Nine Hotel Group HOLDING1 Limited | Extraterritorial | 2015 |
| Nine Hotel Ventures Limited | Hospitality | 2014 |