| MIW Consultants Limited | Information & communication | 2024 |
| MJT Home Improvements Limited | Construction | 2023 |
| MK Hussain Enterprise Ltd | Real estate | 2024 |
| Mkeee Ltd | Wholesale & retail | 2024 |
| Mlcooperations Ltd | Hospitality | 2024 |
| Mlotshwa Holding Limited | Manufacturing | 2019 |
| MM Commercial Finance Ltd | Financial services | 2019 |
| MMH Global Ltd | Wholesale & retail | 2023 |
| Mncubec Ltd | Other services | 2016 |
| MNK41 Freeholders Limited | Real estate | 2022 |
| Moate Limited | Hospitality | 2019 |
| Mobster Munch Ltd | Hospitality | 2025 |
| Modern Engineering and Design Ltd | Construction | 2020 |
| Mohaimanassociates Limited | Transport & logistics | 2024 |
| Moir Homes (Southern) LLP | | 2005 |
| Mole Rats Limited | Professional & scientific | 2026 |
| Monarc Enterprises UK Limited | Wholesale & retail | 2019 |
| Moneypalm Limited | Hospitality | 2019 |
| Monga Chinatown (London) Limited | Hospitality | 2018 |
| Monga Licence Limited | Professional & scientific | 2018 |
| Monga UK Limited | Hospitality | 2017 |
| Monty's Play Hub Ltd | Education | 2021 |
| Moon Sparkle Limited | Hospitality | 2020 |
| Moor Property Management Ltd | Real estate | 2017 |
| Mordelli Holdings Ltd | Real estate | 2020 |
| Moreton Energy Solutions Limited | Construction | 2019 |
| Morgan Wheal Contracting Limited | Wholesale & retail | 2009 |
| Morgarten Restaurants (Southend Airport) Limited | Hospitality | 2018 |
| Morley Logistics Ltd | Transport & logistics | 2017 |
| Morning Star Childminding Ltd | Health & social care | 2023 |
| Morrella Limited | Professional & scientific | 2012 |
| Mortgage Monster Limited | Financial services | 2018 |
| MOT Plug UK Ltd | Wholesale & retail | 2024 |
| Moulla Building Services Ltd | Construction | 2024 |
| Moving Removals Limited | Transport & logistics | 2017 |
| MPD Constructs Ltd | Construction | 2026 |
| MR Kanapathi Ltd | Wholesale & retail | 2022 |
| MR Mortgages Ltd | Financial services | 2022 |
| MR Ping Food Limited | Wholesale & retail | 2026 |
| MR Squeaks Tea Company Ltd | Wholesale & retail | 2018 |
| MRL Distribution UK Limited | Other services | 2025 |
| MS Advance Ltd | Administrative & support | 2019 |
| MSJ Construction Services Ltd | Construction | 2018 |
| MT Baker Consulting Limited | Professional & scientific | 2025 |
| Mtech Alloys Limited | Wholesale & retail | 2017 |
| Mukunachris Ltd | Wholesale & retail | 2024 |
| Mumtaz and Laila Properties Limited | Financial services | 2026 |
| Mura Projects Ltd | Construction | 2017 |
| Murati&Sons Ltd | Hospitality | 2023 |
| Music MAN Trading Limited | Wholesale & retail | 2023 |
| Musicboxlivestyle Ltd | Information & communication | 2020 |
| My IT Network Limited | Information & communication | 2012 |
| My Private Limited | Wholesale & retail | 2024 |
| Myaso Ltd | Professional & scientific | 2025 |
| N J Jarvis Limited | Professional & scientific | 2018 |
| N Tyres Ltd | Wholesale & retail | 2023 |
| N&S Services Ltd | Wholesale & retail | 2017 |
| N.N.G (UK) Limited | Hospitality | 2026 |
| Naijanourishnosh Ltd | Hospitality | 2025 |
| Nail Art 701 Ltd | Other services | 2026 |
| Nail POP Limited | Other services | 2024 |
| Nails by Kris C Ltd | Other services | 2025 |
| Nalabothu Estates Ltd | Real estate | 2026 |
| Nandhra Chiropractic Ltd | Health & social care | 2017 |
| Nathi Ltd | Wholesale & retail | 2020 |
| National Car Wash Ltd | Other services | 2026 |
| Nationwide Jewellery and Watch Repair Co Ltd | Other services | 2014 |
| Natural Life Therapy Limited | Health & social care | 2015 |
| Natural Spa (Westcliff) Limited | Other services | 2020 |
| Natural Stone Baths Ltd | Mining & quarrying | 2021 |
| NAZ Grill Limited | Hospitality | 2020 |
| Nazarite Limited | Professional & scientific | 2009 |
| NBS Imperial Ltd | Hospitality | 2025 |
| Ncsb Consultancy Ltd | Wholesale & retail | 2017 |
| Nela Roxana Ciurea Ltd | Administrative & support | 2026 |
| Nentel Limited | Information & communication | 2001 |
| Nesons Ltd | Wholesale & retail | 2025 |
| Nessie Solutions Ltd | Professional & scientific | 2026 |
| Netdata (Europe) Limited | Information & communication | 2001 |
| Neuro PG Ltd | Health & social care | 2021 |
| New & Used (Trading) Ltd | Wholesale & retail | 2013 |
| New Anka-Ra Company Ltd | Wholesale & retail | 2025 |
| New Building Services Ltd | Construction | 2015 |
| New China POP Limited | Hospitality | 2025 |
| New Life Essentials Limited | Administrative & support | 2020 |
| New Media Format Limited | Information & communication | 2012 |
| New Star View Limited | Hospitality | 2019 |
| Newman Electrical Solutions Ltd | Construction | 2026 |
| Nexo Fineworks Ltd | Construction | 2025 |
| Next GEN Heating and Plumbing Ltd | Construction | 2021 |
| Next Generation Installations Ltd | Construction | 2006 |
| Nextout Ltd | Wholesale & retail | 2024 |
| Nguyen Trading Limited | Hospitality | 2018 |
| Nigerian UK Golfing Assoc (Nuga) Ltd | Education | 2025 |
| Nila Mini Mart Ltd | Wholesale & retail | 2024 |
| Nina's Cucina Italiana Mediterranea Ltd | Hospitality | 2026 |
| Nino Garden Pots UK Limited | Wholesale & retail | 2021 |
| NIV IT Services Limited | Information & communication | 2014 |
| Nivne Estates Ltd | Real estate | 2016 |
| Noblekind Limited | Wholesale & retail | 2018 |