| Maccrown Eyewear Co., Ltd. | Administrative & support | 2023 |
| Maciver Marketing & Sales Ltd | Wholesale & retail | 2026 |
| Macksons Landscaping and Property Services Ltd | Administrative & support | 2022 |
| Macvintage Ltd | Wholesale & retail | 2026 |
| Madamelle Foods Ltd | Manufacturing | 2025 |
| Madamombe Global Network IT Limited | Information & communication | 2013 |
| Made Elsewhere Ltd. | Professional & scientific | 2023 |
| Made in Lagos Ltd | Wholesale & retail | 2023 |
| Made UP London Limited | Wholesale & retail | 2024 |
| Madebyrobot Ltd | Wholesale & retail | 2025 |
| Madeleine Wann Coaching Ltd | Health & social care | 2026 |
| Madeline Beaurney Ltd | Wholesale & retail | 2025 |
| Madison Brcadia Ltd | Wholesale & retail | 2025 |
| MAE Living Group Ltd | Real estate | 2024 |
| MAF Global Ventures Ltd | Professional & scientific | 2024 |
| MAF Tech Marketing Limited | Professional & scientific | 2025 |
| Mafrika Ltd | Manufacturing | 2020 |
| Magavla Ltd | Wholesale & retail | 2024 |
| Magazzini Tech Limited | Information & communication | 2025 |
| Magic Pick Co. Ltd | Professional & scientific | 2019 |
| Magickly LLP | | 2024 |
| Maginnis UN Limited | Information & communication | 2026 |
| Magitech Power System Limited | Administrative & support | 2014 |
| Magly Ltd | Wholesale & retail | 2026 |
| Magmemoriesss Ltd | Wholesale & retail | 2025 |
| Magnovus Group Ltd | Wholesale & retail | 2025 |
| Magnus Clear Cooperation Ltd | Wholesale & retail | 2022 |
| Mago Spark Ltd | Wholesale & retail | 2025 |
| Mahele Ltd | Wholesale & retail | 2025 |
| Mahendrarajah Ltd | Real estate | 2025 |
| Mahuyar UK Health Care Ltd | Health & social care | 2025 |
| Mahuyar UK Ltd | Real estate | 2022 |
| MAI Manufacturing Technology Co. , Ltd | Manufacturing | 2024 |
| Maia Care Services Ltd | Real estate | 2020 |
| Maibahezf Co., Ltd | Wholesale & retail | 2025 |
| Maijahart Limited | Arts & recreation | 2024 |
| Maijinji Information Technology Co., Ltd | Wholesale & retail | 2024 |
| Maikoo Ltd | Wholesale & retail | 2023 |
| Mailbox Services International Ltd | Administrative & support | 2025 |
| Mailer Bros Ltd | Professional & scientific | 2022 |
| Mailing Industry and Trade Ltd | Wholesale & retail | 2025 |
| Mailing Trading Co., Ltd | Manufacturing | 2024 |
| Maillard Life Ltd | Wholesale & retail | 2024 |
| Main Training Limited | Education | 2015 |
| Maisharuizf Co., Ltd | Wholesale & retail | 2025 |
| Maison and Stone Estate Agents Ltd | Real estate | 2025 |
| Maison Crumbie Ltd | Wholesale & retail | 2026 |
| Maison DE Nanny Ltd | Administrative & support | 2025 |
| Maison Little Star Ltd | Wholesale & retail | 2025 |
| Maison Nacira Ltd | Wholesale & retail | 2025 |
| Maitex Limited | Information & communication | 2026 |
| Maizi Ltd | Wholesale & retail | 2025 |
| Majescos Entertainments Limited | Arts & recreation | 2016 |
| Majorbond Limited | Other services | 2020 |
| Majzo Ltd | Wholesale & retail | 2025 |
| Make a Movement Ltd | Real estate | 2025 |
| Make IT Work AI Ltd | Professional & scientific | 2025 |
| Makebon Limited | Wholesale & retail | 2026 |
| Makh Distro Ltd | Information & communication | 2026 |
| Makifim Business Consulting Ltd | Professional & scientific | 2026 |
| Makinsan Aviation UK Ltd | Financial services | 2024 |
| Makite Co., Limited | Extraterritorial | 2009 |
| Makpay Ltd | Financial services | 2019 |
| Malagoon Ltd. | Wholesale & retail | 2024 |
| Malastra Ltd. | Information & communication | 2022 |
| Malcolm Enterprises Limited | Real estate | 2013 |
| Malik Iftikhar Trading Limited | Wholesale & retail | 2025 |
| Mallory Mckellips Ltd | Wholesale & retail | 2025 |
| Malr Ltd | Hospitality | 2025 |
| Malshri Ltd | Professional & scientific | 2024 |
| Maltasells Marketing Ltd | Professional & scientific | 2025 |
| Malumatech Ltd | Manufacturing | 2025 |
| MAM Soft Solutions Ltd | Information & communication | 2026 |
| Mamadazzler Ltd | Wholesale & retail | 2021 |
| Mamapick Ltd | Extraterritorial | 2024 |
| Mamoudou MG Ltd | Wholesale & retail | 2026 |
| Mamta Ltd | Real estate | 2020 |
| Mana IT Services Ltd | Information & communication | 2012 |
| Managed Chaos Club Ltd | Information & communication | 2025 |
| Manan Deals Limited | Wholesale & retail | 2025 |
| Manaya Ltd | Professional & scientific | 2026 |
| Mancunian Ltd | Wholesale & retail | 2024 |
| Mancunio Property Limited | Construction | 2025 |
| Mandarintalker Ltd | Education | 2026 |
| Mandatory KIT Limited | Wholesale & retail | 2026 |
| Mango L Holdings Ltd | Real estate | 2024 |
| Mango L Investments Ltd | Financial services | 2024 |
| Manikani Ltd | Wholesale & retail | 2024 |
| Mankaly Beauty Ltd | Wholesale & retail | 2025 |
| Mankind Psychological Services Ltd | Health & social care | 2024 |
| Manny’S Jewelry Ltd | Wholesale & retail | 2025 |
| Manor Court SE15 Limited | Households | 2021 |
| Manor Street Berkhamsted Management Limited | Households | 2011 |
| Manpai Chemical (UK) Group Ltd | Extraterritorial | 2025 |
| Mansfie Aavarro Ltd | Wholesale & retail | 2025 |
| Mansfield Brown Ltd | Professional & scientific | 2005 |
| Mansion Craft Limited | Professional & scientific | 2025 |
| Mantus Trade Ltd | Wholesale & retail | 2022 |
| Manzorix Limited | Wholesale & retail | 2025 |
| Maohua Zhongbei Construction Engineer Co., Ltd | Wholesale & retail | 2025 |