| New Istok Limited | Education | 2020 |
| New Peking Chef Ltd | Hospitality | 2023 |
| Newbase Sportswear Limited | Wholesale & retail | 2024 |
| Newbs Consultancy Ltd | Manufacturing | 2025 |
| Newgate Homes Ltd | Administrative & support | 2015 |
| Newgate Property Group Ltd | Real estate | 2019 |
| Newhills Holdings Ltd | Real estate | 2024 |
| Newlands Gym Limited | Arts & recreation | 2018 |
| Newlands Promotions Limited | Arts & recreation | 2020 |
| Newton Wright Advisors Ltd | Professional & scientific | 2020 |
| Nexgen Tuition Ltd | Education | 2026 |
| Nextgen Pensions Community CIC | Other services | 2026 |
| Nexus Auxiliary Equipment 1 Limited | Professional & scientific | 2025 |
| Nexus Futures Limited | Professional & scientific | 2022 |
| NIA Lauren Ltd | Health & social care | 2025 |
| Niamh Quinn Limited | Arts & recreation | 2018 |
| Niamhandciara Limited | Wholesale & retail | 2021 |
| Nice PAD Ltd | Real estate | 2021 |
| Nice Price Trading Ltd | Wholesale & retail | 2025 |
| Niche Thai House Limited | Hospitality | 2021 |
| Nicholas Investments Limited | Construction | 2007 |
| Nikbe Global Consulting Ltd | Financial services | 2015 |
| Nilpat Ltd. | Wholesale & retail | 2011 |
| NILYA08 Ltd | Hospitality | 2025 |
| Nissa Consultancy Limited | Financial services | 2013 |
| NJ Carpentry Limited | Construction | 2017 |
| NJL Developments (Essex) Ltd | Construction | 2026 |
| NJL Refurbishments Limited | Construction | 2019 |
| NJS Blade Repair Ltd | Manufacturing | 2024 |
| NJW Print Consultancy Ltd | Professional & scientific | 2023 |
| NK Tech Line Ltd | Information & communication | 2018 |
| NLB Accountancy Services Limited | Professional & scientific | 2026 |
| NME Talent Solutions Ltd. | Administrative & support | 2017 |
| Noak Hill Limited | Information & communication | 2023 |
| Noble Recruiting Ltd | Administrative & support | 2012 |
| Nokes & Co Accountants Limited | Professional & scientific | 2016 |
| Nokes Estate Holdings Limited | Financial services | 2026 |
| Nokes Properties Ltd | Real estate | 2022 |
| Norris Developments Ltd | Real estate | 2025 |
| Norsey Close Residents Association Limited | Households | 2000 |
| Norsey Wood Property Ltd | Construction | 2021 |
| North Essex Piling Limited | Construction | 2012 |
| North Trade Contracts Ltd | Construction | 2011 |
| North Trade Holdings Ltd | Financial services | 2024 |
| Norti Ltd | Other services | 2025 |
| Norton Accountants Limited | Professional & scientific | 2014 |
| Notre Reve Ltd | Real estate | 2013 |
| Nouvo Recruitment (London) Limited | Administrative & support | 2023 |
| Novare Property Ltd | Real estate | 2025 |
| November Properties One Limited | Real estate | 2003 |
| NRG Group Services Limited | Construction | 2025 |
| NRG Landscaping Services Limited | Administrative & support | 2024 |
| NRG Maintenance Services Limited | Administrative & support | 2025 |
| NRJ Property Management and Rental Ltd | Real estate | 2020 |
| NS Plastering Ltd | Construction | 2018 |
| NS Properties (Essex) Ltd | Real estate | 2025 |
| NSL Plumbing Ltd | Construction | 2015 |
| Nsld Ltd | Professional & scientific | 2012 |
| NU Hair Pro Ltd | Wholesale & retail | 2020 |
| NU YOU Medical Limited | Public administration | 2024 |
| Nudo Studio Ltd | Wholesale & retail | 2021 |
| Number 8 (Consulting) Ltd | Professional & scientific | 2024 |
| Nuthatch Property Development and Lettings Limited | Construction | 2020 |
| Nutts Physiotherapy Ltd | Health & social care | 2024 |
| NWC Consulting Limited | Professional & scientific | 2015 |
| O&F Investments Limited | Real estate | 2024 |
| O'Brien Groundwork Ltd | Construction | 2019 |
| O3J Limited | Administrative & support | 2015 |
| Oak and Still Limited | Wholesale & retail | 2020 |
| Oak Hill Mews Property Management Limited | Households | 2025 |
| Oak Park Learning Limited | Education | 2020 |
| Oakchase Design Limited | Professional & scientific | 1996 |
| Oakcroft Media and Technology Services Ltd | Information & communication | 2022 |
| Oakcroft Property Development Ltd | Construction | 2021 |
| Oakdene Brokers Limited | Professional & scientific | 2015 |
| Oakfield Physiotheraphy & Sports Injury Clinic Limited | Health & social care | 2005 |
| Oakline Estates Limited | Households | 2025 |
| Oakstride Ltd | Professional & scientific | 1999 |
| Oakwood Fire & Security Limited | Administrative & support | 2018 |
| Oakwood Grounds Maintenance & Tree Services Ltd | Administrative & support | 2021 |
| Oban Forged Ltd | Wholesale & retail | 2025 |
| Ocean Special Risks Limited | Financial services | 2023 |
| Octane T.I.A Ltd | Real estate | 2019 |
| OCTOBER31 Films Ltd | Information & communication | 2015 |
| Odiin Ltd | Administrative & support | 2019 |
| Odonnell Drylining Ltd | Construction | 2026 |
| Office-Groceries Ltd | Hospitality | 2015 |
| Offworld Outpost Ltd | Wholesale & retail | 2022 |
| Ohana Care Services Ltd | Health & social care | 2023 |
| Ohana Consulting Ltd | Professional & scientific | 2022 |
| Ojoa Ltd | Real estate | 2022 |
| Olive & Co Building Services Limited | Construction | 2017 |
| Oliver Charles Financial Services Ltd | Financial services | 2020 |
| Oliver Walters Ltd | Administrative & support | 2024 |
| Olivetree Projects Limited | Information & communication | 2022 |
| Omaly Cosmetics Limited | Wholesale & retail | 2025 |
| Omni Training Group Ltd | Administrative & support | 2019 |
| Omnilinx Ltd | Information & communication | 2023 |
| Omnirivium Limited | Information & communication | 2019 |
| Omoragbon Consulting Ltd | Information & communication | 2013 |