| Niche Scientific Limited | Professional & scientific | 2022 |
| Nicholas Gardens Management Company Ltd | Households | 1992 |
| Nicholls News & Convenience Store Ltd | Wholesale & retail | 2003 |
| Nicholson Brown Property Ltd | Real estate | 2026 |
| Nicholson Court (Leeds) RTM Company Limited | Households | 2026 |
| Nicholson Properties (Yorkshire) Ltd | Real estate | 2022 |
| Nicholson's Bar Ltd | Hospitality | 2024 |
| Nick Berry Ltd | Construction | 2002 |
| Nick Boldison Ltd | Information & communication | 2011 |
| Nick Booth Consulting Ltd | Professional & scientific | 2017 |
| Nick Drury Investments Limited | Financial services | 2018 |
| Nick Latus Joinery Limited | Construction | 2016 |
| Nick Makasis Co Limited | Professional & scientific | 2005 |
| Nick Varga Ltd | Construction | 2021 |
| Nicks Mobile Mechanics Ltd | Wholesale & retail | 2026 |
| Nicky Goodman & Co Ltd | Professional & scientific | 2016 |
| Nickys Silent Woman Ltd | Hospitality | 2024 |
| Nicnacs Sweets Ltd | Wholesale & retail | 2022 |
| Nicola Dean Gynaecology Ltd | Health & social care | 2018 |
| Nicola Page Financial Solutions Ltd | Professional & scientific | 2024 |
| Nicola Swindells Limited | Administrative & support | 2026 |
| Nicole&Kiwi Ltd | Professional & scientific | 2022 |
| Niel Hartley Events Limited | Arts & recreation | 2024 |
| Nieve Dental & Aesthetics Limited | Health & social care | 2024 |
| Nigel Goodwin Builders Limited | Construction | 2016 |
| Nigel Herring and Co Limited | Professional & scientific | 2001 |
| Nigel Paul Tottie Ltd | Professional & scientific | 2025 |
| Nigel Peet Associates Limited | Professional & scientific | 2008 |
| Nigel Roddis Photography Ltd | Professional & scientific | 2010 |
| Nigel Wakeham Consultants Limited | Professional & scientific | 2013 |
| Night-Light Theatre CIC | Other services | 2019 |
| Nikki EVE Ltd | Professional & scientific | 2022 |
| Nikolajs Silovs Ltd | Transport & logistics | 2025 |
| Nikolaus Moving Images and Words Ltd | Professional & scientific | 2023 |
| NIL Properties Ltd | Households | 2017 |
| Nimbean Limited | Information & communication | 2012 |
| Nimbus Motorsport Limited | Wholesale & retail | 2022 |
| Nimbus Solutions International Limited | Administrative & support | 2003 |
| Nimbuscare Limited | Health & social care | 2015 |
| Nine Dots Marketing Limited | Professional & scientific | 2016 |
| Nine Yard Club Ltd | Professional & scientific | 2014 |
| NINET3 Tailored Safety Solutions Ltd | Professional & scientific | 2025 |
| NINETEEN47 Limited | Professional & scientific | 2015 |
| Ninety Two Thousand 120 Ltd | Professional & scientific | 2016 |
| Niral Properties Limited | Real estate | 2024 |
| Nirav Thakker Dental Limited | Health & social care | 2018 |
| Nirav Thakker Holdings Limited | Financial services | 2016 |
| Nirav Thakker Properties Limited | Real estate | 2016 |
| Nishologie Limited | Financial services | 2017 |
| Nixon Homes Limited | Construction | 1999 |
| Nixon’S Detailing Ltd | Administrative & support | 2025 |
| Nixos (Exeter) Limited | Financial services | 2023 |
| Nixos (REF I) Limited | Financial services | 2023 |
| Nixos (Selby) Limited | Financial services | 2023 |
| Nixos Capital Limited | Financial services | 2023 |
| Nixos Group Limited | Financial services | 2023 |
| Nixos Holdings Limited | Financial services | 2023 |
| Nixsu Ltd | Wholesale & retail | 2021 |
| Njag Ferris Solutions Ltd | Professional & scientific | 2024 |
| NJH Employment Consultants Limited | Professional & scientific | 2016 |
| Njord Investment Ltd | Financial services | 2022 |
| NK Mortgage & Protection Specialists Ltd | Professional & scientific | 2022 |
| NKN Foods Ltd | Hospitality | 2023 |
| NL Engineering Solutions Limited | Professional & scientific | 2023 |
| NL System Design Limited | Information & communication | 2012 |
| NLM International Limited | Other services | 2022 |
| NLS Roofing Ltd | Construction | 2025 |
| NLY Community Sport Ltd | Arts & recreation | 2017 |
| NM Hydro Limited | Energy | 2012 |
| NMA Trading Ltd | Hospitality | 2018 |
| Nmgranary Holdings Limited | Professional & scientific | 2020 |
| Nmgranary Limited | Professional & scientific | 2016 |
| NMJ Technologies Limited | Information & communication | 2013 |
| NN Distribution Limited | Hospitality | 2023 |
| Nnfcc Limited | Professional & scientific | 2018 |
| NO 3 Heworth Limited | Hospitality | 2019 |
| NO 6 Hairdressing Limited | Other services | 1989 |
| NO Boundaries Yorkshire Ltd | Wholesale & retail | 2022 |
| NO Doubt Limited | Other services | 2008 |
| NO More Hiding Ltd | Professional & scientific | 2021 |
| NO Oak Ltd | Professional & scientific | 2024 |
| NO Ordinary Salon (York) Ltd | Other services | 2025 |
| NO. 1 - 4 News Limited | Wholesale & retail | 2006 |
| NO. Fifty Limited | Hospitality | 2019 |
| NO.1 York Holdings Ltd | Hospitality | 1989 |
| NO.1 York Ltd | Hospitality | 1988 |
| NO.195 Ltd | Hospitality | 2024 |
| NO.21 Tanning York Ltd | Other services | 2025 |
| NO.5 Plumbing and Building Services Limited | Construction | 2023 |
| Noahgene Limited | Professional & scientific | 2006 |
| Noble Happenings Ltd | Wholesale & retail | 2020 |
| Noble Property Assets Limited | Real estate | 2024 |
| Noble Works Ltd | Professional & scientific | 2007 |
| Noblewolf Limited | Transport & logistics | 2022 |
| Node Coffee Ltd | Hospitality | 2025 |
| NOI Events Ltd | Administrative & support | 2011 |
| Noise Creative Marketing Ltd | Professional & scientific | 2019 |
| Noisestop Systems LLP | | 2018 |
| Nolan Natural Building Ltd | Construction | 2025 |
| Nomad Props Ltd | Information & communication | 2020 |