| Mudasar Hussain Ltd | Arts & recreation | 2025 |
| Mued Clothing Limited | Wholesale & retail | 2026 |
| Mugs for Clubs Ltd | Wholesale & retail | 2026 |
| Mulgrave Street Action Group Community Interest Company | Agriculture & fishing | 2021 |
| Mulstat Ltd | Wholesale & retail | 2025 |
| Multalytics Limited | Wholesale & retail | 2026 |
| Multi Concept Limited | Transport & logistics | 2025 |
| Mumao Ltd | Wholesale & retail | 2025 |
| Mumtaz Biker Ltd | Wholesale & retail | 2020 |
| Mumzies Kitchen Ltd | Manufacturing | 2020 |
| Munch Grill & Pizza Bar Ltd | Hospitality | 2013 |
| Mundeiths Ltd | Information & communication | 2021 |
| Muni Drip Ltd | Wholesale & retail | 2026 |
| Muradhasanov Limited | Wholesale & retail | 2025 |
| Murfin Consulting Ltd | Public administration | 2024 |
| Musanlin Ltd | Wholesale & retail | 2025 |
| Muse Aura Ltd | Wholesale & retail | 2026 |
| Muse Wick Co Ltd | Wholesale & retail | 2025 |
| MUSE23 Ltd | Information & communication | 2026 |
| Musemint Co., Ltd. | Wholesale & retail | 2025 |
| Muses Jewelry Ltd | Manufacturing | 2025 |
| Mushk Shopping Mall Limited | Wholesale & retail | 2026 |
| Music WL Ltd | Information & communication | 2025 |
| Musical Theatre Raves UK Ltd | Arts & recreation | 2025 |
| Muslim Initiative for Sacred Knowledge (Misk) Ltd | Other services | 2026 |
| Mustang Limited | Professional & scientific | 2016 |
| Mutatio Media Ltd | Professional & scientific | 2020 |
| Mutually Trusts Optical Glass Electronics Co Ltd | Extraterritorial | 2006 |
| Mvip Apparel Limited | Wholesale & retail | 2026 |
| MVP International CIC | Education | 2026 |
| Mvuama Limited | Professional & scientific | 2016 |
| MW Capital Ltd | Financial services | 2025 |
| MW International Media Ltd | Wholesale & retail | 2026 |
| My Backyard Ltd | Real estate | 2023 |
| My Big Lashes Ltd | Wholesale & retail | 2020 |
| My Big Money Tree Limited | Information & communication | 2010 |
| My Clean Canvas Ltd | Administrative & support | 2023 |
| My Colour Cost Ltd | Information & communication | 2026 |
| My Death, My Decision Limited | Other services | 2019 |
| My Grip Game Limited | Other services | 2021 |
| My Handiman CAN Ltd | Construction | 2023 |
| My Heart Recovery Coach Ltd | Health & social care | 2026 |
| My Property Move Limited | Professional & scientific | 2021 |
| My School Rewards Ltd | Information & communication | 2025 |
| My Secret Ventures Ltd | Wholesale & retail | 2016 |
| My Veteran Claim Ltd | Administrative & support | 2026 |
| My.Alleducation.Coaching Limited | Education | 2026 |
| MY6 Limited | Construction | 2002 |
| MY8 Limited | Professional & scientific | 2011 |
| Mycelia Earth Services Ltd | Manufacturing | 2021 |
| Mycityinheart Ltd | Wholesale & retail | 2025 |
| Myclothes Ltd | Wholesale & retail | 2024 |
| MYD Global Ltd | Wholesale & retail | 2026 |
| Myfinesuk Ltd | Information & communication | 2025 |
| Myitabag Ltd | Wholesale & retail | 2026 |
| MYM Distribution Ltd | Wholesale & retail | 2025 |
| Mymyda Ltd | Extraterritorial | 2024 |
| MYN Coffee Ltd | Wholesale & retail | 2013 |
| Myrtlehowdenenterprises Ltd | Wholesale & retail | 2026 |
| Myshrall Engineering Services Ltd | Professional & scientific | 2024 |
| Mysterious Capital Limited | Agriculture & fishing | 2021 |
| Mysterious Invincible Co., Ltd. | Wholesale & retail | 2025 |
| Mystic Celestia Ltd | Information & communication | 2025 |
| Mystical Creations Limited | Wholesale & retail | 2024 |
| Myworknpay Limited | Professional & scientific | 2021 |
| MZARER66 Ltd | Information & communication | 2024 |
| Mzaz Ltd | Wholesale & retail | 2025 |
| Mzhs Ecom Ltd | Wholesale & retail | 2025 |
| Mzone Outlet Limited | Wholesale & retail | 2025 |
| MZR Counsellor Ltd | Health & social care | 2025 |
| N & E Land Solutions Limited | Real estate | 2025 |
| N & N'S Trading Ltd | Manufacturing | 2002 |
| N Jordao Ltd | Health & social care | 2026 |
| N Kerani Ltd | Wholesale & retail | 2025 |
| N NIE Hong Limited | Wholesale & retail | 2024 |
| N Ning Boxin Limited | Wholesale & retail | 2024 |
| N Ning Liangshuai Limited | Wholesale & retail | 2024 |
| N&A Capital Ltd | Financial services | 2026 |
| N&D Interlink Ltd | Wholesale & retail | 2026 |
| N.D. Protheroe Ltd | Construction | 2011 |
| N.K. Property Solutions Ltd | Hospitality | 2025 |
| NA Nexus Global Ltd | Wholesale & retail | 2025 |
| Nabad Management Ltd | Real estate | 2024 |
| Nabiisi Ltd | Other services | 2025 |
| Nabo Health Ltd | Health & social care | 2019 |
| Nadiamir Ltd | Information & communication | 2020 |
| Nadine's Property Services Ltd | Real estate | 2021 |
| Naeldeals Ltd | Wholesale & retail | 2025 |
| Nafees UR Rehman Ltd | Wholesale & retail | 2023 |
| Nafeesa Begum Ltd | Real estate | 2019 |
| Nailiang Import and Export Co., Ltd | Wholesale & retail | 2025 |
| Naize Import and Export Co Ltd | Wholesale & retail | 2025 |
| Nakhab Ltd | Administrative & support | 2026 |
| Nalston Global Ltd | Wholesale & retail | 2026 |
| Nama Suites Limited | Real estate | 2025 |
| Namaboo Holdings Ltd | Professional & scientific | 2025 |
| Nambaman Ltd | Arts & recreation | 2025 |
| Nanaboss Ltd | Manufacturing | 2025 |
| Nandz Traders Ltd | Wholesale & retail | 2024 |
| Nanjing JT Energy Saving Tech. Co., Ltd. | Administrative & support | 2015 |