| MRG Propco Limited | Real estate | 2017 |
| MRJ Plant Hire Limited | Administrative & support | 2010 |
| MRJ Property Holdings Ltd | Financial services | 2016 |
| MRK CA Ltd | Professional & scientific | 2025 |
| MRM Consultancy Services Limited | Professional & scientific | 2025 |
| Mrmk Holdings Limited | Financial services | 2020 |
| Mrpizza.Ecclesfield Ltd | Hospitality | 2021 |
| Mrrs Limited | Households | 2021 |
| MRS Modest Ltd | Wholesale & retail | 2025 |
| MRS Properties (Lancaster) Ltd | Construction | 2019 |
| MRS Shah's Spice Company Ltd | Wholesale & retail | 2021 |
| MRT 100 Limited | Hospitality | 2004 |
| MRT Real Estate Limited | Extraterritorial | 2021 |
| Mrtk Limited | Manufacturing | 2026 |
| Mrw.Construction Ltd | Construction | 2025 |
| Mrxhaust Mrtyre Ltd | Wholesale & retail | 2024 |
| Mrxy Limited | Wholesale & retail | 2018 |
| MS & CS Limited | Health & social care | 2021 |
| MS & KG Medical Ltd | Health & social care | 2023 |
| MS Bakery Workshop Ltd | Manufacturing | 2023 |
| MS Contracts Management Ltd | Other services | 2018 |
| MS Goods Limited | Transport & logistics | 2025 |
| MS Mistry Ltd | Hospitality | 2021 |
| MS Moore Constructions Limited | Construction | 2022 |
| MS Moore Properties Limited | Real estate | 2018 |
| MS Rapid Logistic Limited | Transport & logistics | 2017 |
| MS Solutions and Services Ltd | Information & communication | 2020 |
| MS Stores SY Ltd | Wholesale & retail | 2024 |
| MS Travel & Tours Limited | Administrative & support | 2023 |
| Ms&Sm Medical Limited | Health & social care | 2022 |
| MSA Sports Ltd | Manufacturing | 2020 |
| Msaskincare Ltd | Wholesale & retail | 2019 |
| MSB Group UK Ltd | Hospitality | 2020 |
| MSB Lettings Limited | Real estate | 2019 |
| MSC Academy Limited | Professional & scientific | 2022 |
| MSC Access Enterprises Ltd | Construction | 2015 |
| MSC Business Analysts Limited | Professional & scientific | 2015 |
| MSC Business Capital Limited | Professional & scientific | 2007 |
| MSC Business Development Limited | Professional & scientific | 2015 |
| MSC Business Funding Limited | Professional & scientific | 2017 |
| MSC Business Growth Limited | Administrative & support | 2003 |
| MSC Business Information Limited | Professional & scientific | 2003 |
| MSC Business Innovation (Development) Limited | Professional & scientific | 2015 |
| MSC Business Innovation Limited | Professional & scientific | 2015 |
| MSC Business Resource Limited | Professional & scientific | 2015 |
| MSC Business Strategy Limited | Professional & scientific | 2017 |
| MSC Infintec Limited | Professional & scientific | 2020 |
| MSC Innovation Advisors Limited | Administrative & support | 2011 |
| MSC Property Development and Maintenance Limited | Real estate | 2004 |
| MSC R&D Analysis Limited | Administrative & support | 2011 |
| MSC R&D Commercialisation Limited | Professional & scientific | 2014 |
| MSC R&D Horizon 2020 Limited | Professional & scientific | 2020 |
| MSC R&D Innovation Limited | Administrative & support | 2003 |
| MSC R&D IP Limited | Professional & scientific | 2008 |
| MSC R&D Limited | Professional & scientific | 2014 |
| MSC R&D Partners Limited | Financial services | 2016 |
| MSC R&D Pera Limited | Professional & scientific | 2016 |
| MSC R&D Services Limited | Administrative & support | 2003 |
| MSC R&D Tax Services Limited | Professional & scientific | 2002 |
| Msdc Ltd | Professional & scientific | 2018 |
| Msdi UK Ltd | Wholesale & retail | 2026 |
| MSE Sports Therapy Ltd | Arts & recreation | 2025 |
| Mseh Ltd | Wholesale & retail | 2022 |
| MSG360 Limited | Information & communication | 2007 |
| MSH (Derbyshire) Limited | Wholesale & retail | 2011 |
| MSH Group Limited | Real estate | 2021 |
| MSJ Rentals Ltd | Real estate | 2025 |
| Msjsj Ltd | Administrative & support | 2026 |
| MSK Medics Limited | Health & social care | 2024 |
| MSL Property Developments Ltd | Real estate | 2024 |
| MSM Geer Ltd | Hospitality | 2026 |
| Msm-Consulting (Global) Ltd | Administrative & support | 2015 |
| Msmk Training Ltd | Other services | 2014 |
| Msmuk Limited | Wholesale & retail | 2026 |
| MSR Cleantech Ltd | Administrative & support | 2024 |
| MSR Comms Ltd | Information & communication | 2022 |
| Msrk Consultancy Limited | Health & social care | 2016 |
| Mssd Consulting Limited | Information & communication | 2015 |
| MST Furniture Ltd | Manufacturing | 2026 |
| MT Bar Limited | Hospitality | 2018 |
| MT Electrical ( Yorkshire) Limited | Construction | 2023 |
| MT Engines Ltd | Wholesale & retail | 2025 |
| MT Services Tilers Ltd | Construction | 2019 |
| MT Tyres U.K. Ltd | Wholesale & retail | 2020 |
| MT13 Ltd | Education | 2011 |
| MT2 England Ltd | Real estate | 2026 |
| MTA Projects Ltd | Professional & scientific | 2006 |
| MTA Training Limited | Education | 2019 |
| MTD Medical Ltd | Health & social care | 2021 |
| Mtech Universal Limited | Construction | 2019 |
| MTF Animation Ltd | Information & communication | 2018 |
| MTK Assist Limited | Extraterritorial | 2014 |
| MTP Engineering Services Ltd | Professional & scientific | 2025 |
| Mtree Limited | Real estate | 2022 |
| MTS Automation Ltd | Construction | 2026 |
| MTS Storage Ltd | Transport & logistics | 2026 |
| Mtsk Estates Ltd | Hospitality | 2023 |
| MTU Music & Theatre Training Ltd | Education | 2019 |
| Mubseoul Ltd | Information & communication | 2023 |
| Much More Than Bricks Ltd | Real estate | 2023 |