| My Project Group Limited | Construction | 2023 |
| My Scribe Solutions Ltd | Wholesale & retail | 2025 |
| My Supported Life LLP | | 2018 |
| My Therapy Products Ltd | Wholesale & retail | 2020 |
| My Trailblazers Healthcare Ltd | Administrative & support | 2021 |
| My VIS Ltd | Manufacturing | 2024 |
| Myagen Limited | Water & waste | 2013 |
| Myatt Management Services Limited | Professional & scientific | 2015 |
| Mycopunks Ltd | Wholesale & retail | 2021 |
| Mycress Management Limited | Construction | 2014 |
| Myescapeplan Ltd | Information & communication | 2025 |
| Mykad Limited | Construction | 2023 |
| Mynzo Ltd | Wholesale & retail | 2025 |
| Mypku Ltd | Information & communication | 2026 |
| Mypropertydevelopment Ltd | Construction | 2026 |
| Myrecoverease (UK) Limited | Health & social care | 2026 |
| Myride Gloucester Ltd | Transport & logistics | 2025 |
| Myrna Properties Limited | Real estate | 2016 |
| Mysilversands Limited | Administrative & support | 2006 |
| MYZ Trading Ltd | Wholesale & retail | 2021 |
| MZ Productions Limited | Information & communication | 2012 |
| N & J White Properties Ltd | Real estate | 2020 |
| N J White Properties Ltd | Real estate | 2025 |
| N Wheatley Builders Ltd | Construction | 2019 |
| N&M Associates Limited | Information & communication | 2020 |
| N-Virocycle Limited | Administrative & support | 1997 |
| N.Hunt Property Ltd | Real estate | 2024 |
| N.T.M Motor Vehicle Services Ltd | Wholesale & retail | 2023 |
| Naanitech Consultants Limited | Information & communication | 2011 |
| Naas Lane Fisheries Limited | Arts & recreation | 2020 |
| Naboagye Limited | Health & social care | 2017 |
| Nabulena Ltd | Wholesale & retail | 2025 |
| Nadira Consults Limited | Information & communication | 2023 |
| Nailed on Farrier Supplies Limited | Wholesale & retail | 2013 |
| Nailsworth Management Company Limited | Households | 2001 |
| Naldec Ltd | Construction | 2025 |
| Nams Solutions Limited | Information & communication | 2010 |
| Naphill Developments Limited | Construction | 2024 |
| Narcissistic Limited | Wholesale & retail | 2023 |
| Narrative Breakers Network C.I.C. | Education | 2026 |
| NAS Joinery & Shopfitting Ltd | Construction | 2017 |
| Nash Alliance Ltd | Health & social care | 2013 |
| Naswell Care Ltd | Health & social care | 2011 |
| Nataliya Idowu Ltd | Health & social care | 2018 |
| Natasha Hunt Ltd | Arts & recreation | 2025 |
| Natashab Ltd | Other services | 2025 |
| Nationwide Asset Recovery & Auctioneers Ltd | Administrative & support | 2020 |
| Nationwide Auctioneers Ltd | Administrative & support | 2021 |
| Nationwide Building Control Services Limited | Extraterritorial | 2006 |
| Nationwide Construction Recruitment Limited | Extraterritorial | 2015 |
| Nationwide Paving and Resin Driveways Ltd | Construction | 2019 |
| Nationwide Plant & Tool Hire Limited | Administrative & support | 2018 |
| Nationwide Plant Operators Limited | Extraterritorial | 2015 |
| Nationwide Plant Rental Limited | Extraterritorial | 1996 |
| Nationwide Powered Access Limited | Administrative & support | 2018 |
| Nationwide Recruitment (UK) Limited | Extraterritorial | 2015 |
| Nationwide Stone Supplies Limited | Wholesale & retail | 2014 |
| Nativ 99 Ltd | Transport & logistics | 2022 |
| Natlife Limited | Wholesale & retail | 2025 |
| Natural Capital Bank Ltd | Professional & scientific | 2026 |
| Natural Dog Treat Boxes Ltd | Manufacturing | 2021 |
| Natural Integration Limited | Professional & scientific | 2004 |
| Nature First Limited | Agriculture & fishing | 1993 |
| Nature First Properties Ltd | Real estate | 2023 |
| Nature in Art Trust | Arts & recreation | 1990 |
| Nature Schools Ltd | Education | 2015 |
| Natures Mineral Ltd | Wholesale & retail | 2023 |
| Naughty Little ME Limited | Wholesale & retail | 2013 |
| Nava Vayas Ltd | Information & communication | 2018 |
| Navavayas Lettings Ltd | Real estate | 2020 |
| Navavayas Trading Ltd | Financial services | 2020 |
| Navigate+ Ltd | Education | 2023 |
| Nayareeb Limited | Health & social care | 2017 |
| Naylor Finance Ltd | Financial services | 2023 |
| Naylor Powell Holdings Limited | Financial services | 2019 |
| Naylor Powell Limited | Real estate | 2014 |
| Nazdak Limited | Health & social care | 2004 |
| NB Dental LAB Ltd | Manufacturing | 2019 |
| NB IT Services Ltd | Information & communication | 2019 |
| NB Nail and Spa Limited | Other services | 2024 |
| Nbfs Distribution Ltd | Wholesale & retail | 2024 |
| NBX Ltd | Education | 2016 |
| NC Aesthetics Ltd | Other services | 2023 |
| NCC Properties Ltd | Real estate | 2017 |
| NCR Drop Kerb Ltd | Construction | 2016 |
| NCS Consulting Ltd | Information & communication | 2023 |
| NDJ Sourcing Ltd | Wholesale & retail | 2025 |
| NDK Elevate Ltd | Education | 2026 |
| NDP Precision Engineering Limited | Manufacturing | 2001 |
| NDT Parcel UK Ltd | Transport & logistics | 2021 |
| Ndunma Ltd | Health & social care | 2025 |
| Neate Roofing Services Ltd | Construction | 2025 |
| NEB Stratford Holdings Ltd | Financial services | 2024 |
| Nebula Event Structures Ltd | Administrative & support | 2025 |
| Need for Speed Piotr Ewiak Transport Ltd | Transport & logistics | 2017 |
| Needham Ventures Limited | Professional & scientific | 2018 |
| Neil West Services Limited | Real estate | 2008 |
| Neil Williams Traditional Lead Work & Roofing Services Ltd | Construction | 2008 |
| Nembhard Healthcare Limited | Public administration | 2025 |
| Nemcon Commercial Property Ltd | Real estate | 2023 |