| MS Dhami Courier Ltd | Transport & logistics | 2025 |
| MS Facilities Ltd | Professional & scientific | 2025 |
| MS FIX IT Services Ltd | Professional & scientific | 2021 |
| MS Locum Ltd | Other services | 2011 |
| MS Notts Limited | Hospitality | 2025 |
| MS Service and Repairs Ltd | Wholesale & retail | 2024 |
| MS Shareef Limited | Health & social care | 2011 |
| MS Skin Solutions Ltd | Health & social care | 2025 |
| MS Squared Limited | Administrative & support | 2007 |
| MS Supply Ltd | Wholesale & retail | 2020 |
| MS Waterworks Limited | Construction | 2015 |
| Ms&Lo Properties Limited | Real estate | 2026 |
| MSA Plumbing & Heating Ltd | Construction | 2024 |
| MSA Practice Limited | Health & social care | 2019 |
| MSB Clothing Limited | Wholesale & retail | 2026 |
| MSB MOT and Repairs Ltd | Wholesale & retail | 2022 |
| MSB Motor Repairs Limited | Wholesale & retail | 2025 |
| Msbb Holdings Ltd | Households | 2025 |
| MSC Demolition (East Midlands) Ltd | Administrative & support | 2017 |
| MSC Ventures (UK) Ltd | Professional & scientific | 2019 |
| Msc.Software Limited | Information & communication | 1986 |
| MSD Cars Ltd | Extraterritorial | 2020 |
| MSD Convenience Ltd | Wholesale & retail | 2025 |
| MSD Music Ltd | Administrative & support | 2022 |
| MSH Commercial Services Limited | Hospitality | 2023 |
| MSH Construction (Notts) Ltd | Construction | 2018 |
| MSH Supplies Ltd | Wholesale & retail | 2021 |
| MSI Property Ltd | Real estate | 2022 |
| Msir Property Ltd | Real estate | 2020 |
| MSK 2026 Ltd | Hospitality | 2026 |
| MSK Care Ltd | Health & social care | 2025 |
| MSK Healthcare Ltd | Health & social care | 2020 |
| Msk&Sport Reporting Limited | Professional & scientific | 2015 |
| MSL Birkin Ltd | Real estate | 2023 |
| MSL Havenwood Ltd | Real estate | 2023 |
| MSL Optics Limited | Health & social care | 2023 |
| MSL Radford Ltd | Real estate | 2023 |
| MSL Waterloo Ltd | Real estate | 2023 |
| Mslw Property Partners Ltd | Real estate | 2024 |
| MSN 24/7 Limited | Health & social care | 2023 |
| MSP Blueprint Limited | Information & communication | 2019 |
| MSP Kickstart Limited | Other services | 2025 |
| MSP Properties Ltd | Financial services | 2022 |
| MSR Newsgroup Limited | Wholesale & retail | 2004 |
| MSS Equity Ltd | Information & communication | 2025 |
| MST Pizza Ltd | Wholesale & retail | 2026 |
| MSW Limited | Construction | 2006 |
| Msxpress Ltd | Wholesale & retail | 2025 |
| MT Lift Tech Ltd | Construction | 2024 |
| MT Maxillofacial Ltd | Health & social care | 2021 |
| MT Plastering and Professional Finishings Ltd | Construction | 2023 |
| MT Play Ltd | Hospitality | 2019 |
| MTA Medical Ltd | Health & social care | 2016 |
| MTA Ventures Ltd | Real estate | 2025 |
| MTB Art Ltd | Arts & recreation | 2013 |
| MTB Goods Ltd | Wholesale & retail | 2023 |
| MTB Outlaws C.I.C. | Arts & recreation | 2020 |
| MTC Support Transport Ltd | Transport & logistics | 2024 |
| MTD Music Limited | Information & communication | 2025 |
| MTD Property Services Limited | Real estate | 2026 |
| Mtech OPS Ltd | Professional & scientific | 2024 |
| Mtfw Electrical Ltd | Construction | 2014 |
| MTG Energy Solutions Ltd | Administrative & support | 2010 |
| MTG Projects Ltd | Construction | 2020 |
| MTH Estates Limited | Real estate | 2023 |
| Mthume Limited | Health & social care | 2021 |
| Mtif (BEZ) Limited | Other services | 2018 |
| Mtnj Consulting Limited | Construction | 2023 |
| MTP Hire Ltd | Administrative & support | 2026 |
| MTP Plant Service Ltd | Manufacturing | 2026 |
| MTP Site Survey Ltd | Administrative & support | 2026 |
| MTQ Consultants Limited | Information & communication | 2019 |
| MTS Scientific UK Limited | Extraterritorial | 2003 |
| MTW Organisation Limited | Arts & recreation | 2023 |
| Mtwc Limited | Professional & scientific | 2024 |
| MU Capital Holdings Ltd | Financial services | 2020 |
| MU Consulting Ltd | Professional & scientific | 2025 |
| Muaic 1 Capital Ltd | Other services | 2022 |
| Muaic 10 Capital Ltd | Other services | 2022 |
| Muaic 11 Capital Ltd | Other services | 2022 |
| Muaic 12 Capital Ltd | Administrative & support | 2022 |
| Muaic 13 Capital Ltd | Administrative & support | 2024 |
| Muaic 2 Capital Ltd | Other services | 2022 |
| Muaic 3 Capital Ltd | Other services | 2022 |
| Muaic 4 Capital Ltd | Other services | 2022 |
| Muaic 5 Capital Ltd | Other services | 2022 |
| Muaic 6 Capital Ltd | Other services | 2022 |
| Muaic 7 Capital Ltd | Other services | 2022 |
| Muaic 8 Capital Ltd | Other services | 2022 |
| Muaic 9 Capital Ltd | Other services | 2022 |
| Muaic Capital Investments Ltd | Administrative & support | 2025 |
| Mual Limited | Wholesale & retail | 2024 |
| Mubeen Logistics Ltd | Other services | 2021 |
| Much More Human Ltd | Administrative & support | 2010 |
| Muchie Associates Limited | Health & social care | 2026 |
| Muchina Cars Ltd | Wholesale & retail | 2024 |
| Mudariholdings Ltd | Agriculture & fishing | 2026 |
| Muddiman Property and Lettings Limited | Real estate | 2013 |
| Muddy Boots Farm Project Ltd | Agriculture & fishing | 2023 |
| Mude Home Limited | Wholesale & retail | 2023 |