| Nicholsons IP Ltd | Professional & scientific | 2016 |
| Nick Adams Limited | Construction | 2011 |
| Nick Allinson Limited | Information & communication | 2008 |
| Nick Bracey Consultancy Limited | Professional & scientific | 2021 |
| Nick Bracey Investments Limited | Professional & scientific | 2020 |
| Nick Bracey Plumbing & Heating Limited | Construction | 2019 |
| Nick Cooke Mastering Limited | Information & communication | 2017 |
| Nick Dewfall Limited | Arts & recreation | 2014 |
| Nick Edgar Engineering Limited | Professional & scientific | 2017 |
| Nick Gutfreund Fine Furniture Limited | Manufacturing | 2008 |
| Nick James Limited | Professional & scientific | 1998 |
| Nick James Plumbing & Heating Ltd | Households | 2016 |
| Nick Lundy Draughting Services Limited | Construction | 2015 |
| Nick O'Time Limited | Extraterritorial | 1993 |
| Nick Pepper Consulting Services Limited | Information & communication | 2026 |
| Nick Sheppard Roofing Limited | Construction | 2017 |
| Nick Tarr Associates Limited | Professional & scientific | 2008 |
| Nick Warren Limited | Arts & recreation | 2010 |
| Nick White Landscaping Ltd | Administrative & support | 2025 |
| Nick Williams Property Ltd | Construction | 2026 |
| Nick Xena Consulting Limited | Information & communication | 2012 |
| Nickjay Ltd | Professional & scientific | 2010 |
| Nicks Flooring Ltd | Construction | 2024 |
| Nicks IT Solutions Limited | Information & communication | 2005 |
| Nicks Property and Accommodation Ltd | Real estate | 2023 |
| Nicky Gray Consulting Ltd | Professional & scientific | 2024 |
| Nicky Henderson Orthodontic Services Ltd | Health & social care | 2012 |
| Nicky Lelievre Football Consultancy Ltd | Arts & recreation | 2020 |
| Nicky Lumb Ltd | Arts & recreation | 2024 |
| Nicky&Co Ltd | Professional & scientific | 2025 |
| Nico Properties Limited | Real estate | 2024 |
| Nico Toys Limited | Wholesale & retail | 2025 |
| Nicodav Logistics Ltd | Transport & logistics | 2025 |
| Nicola and Danny H2O Ltd | Construction | 2022 |
| Nicola Chan Limited | Professional & scientific | 2019 |
| Nicola Dudbridge Design & Artwork Ltd | Professional & scientific | 2019 |
| Nicola Mayhew HR Consulting Limited | Administrative & support | 2015 |
| Nicola Roofing Limited | Construction | 2023 |
| Nicola T. Chang Ltd | Arts & recreation | 2025 |
| Nicolae Marius Andrei Ltd | Construction | 2025 |
| Nicolas James Environmental Ltd | Construction | 2026 |
| Nicole and Bowie Limited | Other services | 2022 |
| Nicole L Worle Limited | Education | 2023 |
| Nicolesneuroscience Ltd | Professional & scientific | 2023 |
| Nicotinize Ltd | Extraterritorial | 2017 |
| Nicu Transport Ltd | Transport & logistics | 2014 |
| Nicug Ventures Ltd | Transport & logistics | 2018 |
| Nicusormelcusor Ltd | Wholesale & retail | 2023 |
| Nid'Air Ltd | Administrative & support | 2023 |
| Nida TRADERS79 Ltd | Wholesale & retail | 2025 |
| Nifi Projects Ltd | Construction | 2026 |
| Nifty Solutionz Ltd | Wholesale & retail | 2018 |
| Nifty Winnie Ltd | Wholesale & retail | 2025 |
| Nigel Adams Engineering Limited | Information & communication | 2025 |
| Nigel Fudge Properties Limited | Real estate | 2023 |
| Nigel King and Partners LLP | | 2020 |
| Nigel Matthew Limited | Construction | 1987 |
| Nigel Reynolds Limited | Health & social care | 2008 |
| Nigel Sears Limited | Other services | 2014 |
| Nigel Singer Limited | Education | 2015 |
| Nigel Wren Construction Ltd | Construction | 2026 |
| Nigels Home Refurbish Ltd | Construction | 2018 |
| Night Eagle Ltd | Wholesale & retail | 2023 |
| Night Owls Productions Ltd | Information & communication | 2022 |
| Night Shift Ultra Ltd | Arts & recreation | 2024 |
| Night Sky Nomads Ltd | Wholesale & retail | 2025 |
| Nightingale Court (Harrow) Management Company Limited | Households | 1998 |
| Nightingale Rentals Ltd | Real estate | 2022 |
| Nightingale Woods (Wendover) Residential Management Company Limited | Households | 2020 |
| Nightingales Bakery and Sweet Shop Limited | Wholesale & retail | 2025 |
| Nightingales Discount Store Limited | Wholesale & retail | 2026 |
| Nightstrike Limited | Information & communication | 2012 |
| Nightstrike Records Limited | Wholesale & retail | 2018 |
| Nightwatchman Films Limited | Arts & recreation | 2011 |
| Nihop PUB Battle Limited | Hospitality | 2025 |
| Nijero Groups Limited | Public administration | 2023 |
| Niji Sushi Limited | Hospitality | 2023 |
| Nikah Academy Ltd | Education | 2024 |
| Nikdam Consulting Ltd | Information & communication | 2012 |
| Nikdam Property Ltd | Real estate | 2023 |
| Nikki's Taxis Limited | Transport & logistics | 2025 |
| Nikmay Healthcare Limited | Health & social care | 2014 |
| Niko's Mobile Cleaning Ltd | Administrative & support | 2019 |
| Nikola S Limited | Transport & logistics | 2018 |
| Nikola'Ss-Flo Transport Ltd | Transport & logistics | 2020 |
| NIL Rong International Ltd | Wholesale & retail | 2019 |
| Nilaari Agency | Health & social care | 1999 |
| Nile Danube Limited | Professional & scientific | 2014 |
| Nile INS Limited | Financial services | 2020 |
| Nile Valley Holdings Ltd | Education | 2024 |
| Niles Engineering Ltd | Construction | 2018 |
| Nilestone Limited | Real estate | 2025 |
| Nima European Food Ltd | Wholesale & retail | 2025 |
| Nima Power Limited | Energy | 2010 |
| Nimblearc Ltd | Wholesale & retail | 2025 |
| Nimbus Agri-Tech Ltd | Manufacturing | 2025 |
| Nimmi's Kitchen PVT Ltd | Manufacturing | 2023 |
| Nimrod Associates Limited | Professional & scientific | 2014 |
| Nina Farmer D H & T Limited | Health & social care | 2014 |
| Nina's Garden Limited | Administrative & support | 2023 |