| New Model Audio Ltd | Professional & scientific | 2014 |
| New Oscott Management Company Limited | Households | 2002 |
| New Perspectives Consulting Limited | Professional & scientific | 2016 |
| New Place Residents Association Limited | Households | 1966 |
| New River View Estate Management Company Limited | Real estate | 2020 |
| New Road Group Limited | Construction | 2017 |
| New Roofing Generation Ltd | Construction | 2025 |
| New Ruskin House (Croydon) Club Limited | Health & social care | 1969 |
| New Spiceland Croydon Limited | Hospitality | 2021 |
| New Style Construction ( UK ) Ltd | Construction | 2019 |
| New Vision for Women C.I.C. | Health & social care | 2016 |
| New Vision Regeneration Centre Ltd | Real estate | 2010 |
| New Way Care Services Limited | Health & social care | 2018 |
| New Wings Cottage Ltd | Hospitality | 2020 |
| Newbridge Gardens Management Company (NO 1) Limited | Households | 2005 |
| Newbridge Gardens Management Company (NO 2) Limited | Households | 2005 |
| Newbury One Limited | Real estate | 2026 |
| Newbury Two Limited | Real estate | 2026 |
| Newco West END Limited | Real estate | 2018 |
| Newcomen Street Management Company Limited | Households | 2001 |
| Newell Limited | Real estate | 2015 |
| Newer-Ways Services Ltd | Health & social care | 2018 |
| Newgate Assets Limited | Construction | 2011 |
| Newgate Property Management Limited | Real estate | 2017 |
| Newgen Strategy Ltd | Professional & scientific | 2023 |
| Newham Works Ltd | Education | 2018 |
| Newick Fencing & Gates Limited | Administrative & support | 2011 |
| Newington Green London DRY Cleaners Limited | Administrative & support | 2025 |
| Newlands NW4 Limited | Administrative & support | 2014 |
| Newlook Merchants Limited | Administrative & support | 2020 |
| Newman 7 Holdings Limited | Administrative & support | 2019 |
| Newmans Garage Limited | Extraterritorial | 2004 |
| Newmans of Maidenhead Limited | Wholesale & retail | 1992 |
| Newmar Limited | Professional & scientific | 1990 |
| Newrest-Servair LCY UK Limited | Other services | 2007 |
| Newroniq Ltd | Information & communication | 2026 |
| Newroz Bazare Limited | Wholesale & retail | 2015 |
| News and Booze Express Limited | Wholesale & retail | 2016 |
| Newspruce Property Management Limited | Households | 1991 |
| Newtex Limited | Professional & scientific | 2022 |
| Newton House RTM Company Ltd | Households | 2016 |
| Newtouch Associates Ltd | Professional & scientific | 2015 |
| NEWVENTURE2023 Limited | Professional & scientific | 2022 |
| NEWVENTURES2320 Ltd | Real estate | 2025 |
| Nexa Distribution Ltd | Wholesale & retail | 2026 |
| Nexcart Ltd | Wholesale & retail | 2024 |
| Nexen Strategy Limited | Information & communication | 2026 |
| Nexgen ESG Ltd | Professional & scientific | 2024 |
| Nexgen Immigration UK Ltd | Professional & scientific | 2025 |
| Nexhive Collective Limited | Wholesale & retail | 2024 |
| Nexis SOLUTIONS1 Ltd | Wholesale & retail | 2026 |
| Nexora Creative Studio Ltd | Information & communication | 2026 |
| Next Generation Combat Ltd | Arts & recreation | 2016 |
| Next Nest Finds Ltd | Wholesale & retail | 2025 |
| Next Step B2B Ltd | Wholesale & retail | 2020 |
| Nextech Nexus Ltd | Wholesale & retail | 2025 |
| Nextleap Recruitment Limited | Administrative & support | 2023 |
| Nextquest Studio Ltd | Wholesale & retail | 2025 |
| Nextstop Bargains Limited | Wholesale & retail | 2025 |
| Nexus ABI Limited | Health & social care | 2026 |
| Nexus Creative HQ Limited | Information & communication | 2020 |
| Nexus Earth Technology Ltd | Information & communication | 2025 |
| Neza Construction Ltd | Construction | 2012 |
| NF Refurbishments Ltd | Construction | 2023 |
| Ngauruhoe Film Limited | Information & communication | 2015 |
| Ngen Markets Private Limited | Information & communication | 2022 |
| NH Cloud Solutions Ltd | Information & communication | 2022 |
| NHC Limited | Manufacturing | 2000 |
| Nhnp Limited | Financial services | 2016 |
| Niangsix Ltd | Transport & logistics | 2025 |
| Niazi Ltd | Other services | 2016 |
| Nibrus Ltd | Professional & scientific | 2025 |
| Nice & DRY Ltd | Manufacturing | 2012 |
| Nice Flavours Ltd | Hospitality | 2024 |
| Nicer Ltd | Construction | 2018 |
| Niche Advice Limited | Financial services | 2008 |
| Nicholas Consultancy Services Ltd | Information & communication | 2021 |
| Nicholson Empire Ltd | Health & social care | 2011 |
| Nickjoy Financial Services Ltd | Professional & scientific | 2021 |
| Nicky's Food Store Limited | Wholesale & retail | 2011 |
| Nicky's Holding Ltd | Hospitality | 2017 |
| Nico&Fabio Ltd | Hospitality | 2019 |
| Nicola Hankins Ltd | Professional & scientific | 2014 |
| Niella Property Services Ltd | Real estate | 2016 |
| Nielsonsmith Ltd | Information & communication | 2010 |
| Nifty Moves Ltd | Other services | 2019 |
| Nigel Stratton Limited | Financial services | 2021 |
| Nightingale Gardens (Cambridge) Management Company Limited | Households | 2004 |
| Nightingale Gardens (Colchester) Management Company Limited | Households | 2013 |
| Nightingale Gardens (NR1 and NR3) Residents Management Company Limited | Households | 2015 |
| Nightingale Place Estate Management Company Limited | Real estate | 2021 |
| Nightingale Rise (Swindon) Management Company Limited | Households | 2011 |
| Nightingale Road RTM Company Limited | Households | 2026 |
| Nightingale Services Ltd | Administrative & support | 2018 |
| Nightingales (Crowborough) Management Company Limited | Households | 2019 |
| Nightingales (Kenley) Management Company Limited | Households | 1995 |
| Nightwalker.Global Calling's Ltd | Professional & scientific | 2024 |
| Nightwolf Games Ltd | Information & communication | 2017 |
| Niha Cuts & Beauty Ltd | Other services | 2012 |
| Nihcas Management Limited | Extraterritorial | 2022 |