| MJB Avanti Accounting Franchise Ltd | Extraterritorial | 2017 |
| MJB Avanti Bookkeeping Franchise Ltd | Professional & scientific | 2017 |
| MJB Avanti Group Franchise Ltd | Professional & scientific | 2016 |
| MJB Avanti Limited | Professional & scientific | 2020 |
| MJB Avanti Networking Ltd | Other services | 2011 |
| MJB Plumbing Services Limited | Construction | 2013 |
| MJD Electrical (Ipswich) Limited | Manufacturing | 2002 |
| MJE Sports Limited | Arts & recreation | 2012 |
| MJG Norfolk Ltd | Wholesale & retail | 2020 |
| MJK Architectural Design Ltd | Professional & scientific | 2022 |
| MJM Associates Consulting Ltd | Information & communication | 2013 |
| Mjod Consulting Services Limited | Information & communication | 2013 |
| MJP ME Ltd | Professional & scientific | 2025 |
| MJR Electrical Services (East Anglia) Ltd | Construction | 2025 |
| MJS Building Management Limited | Real estate | 2018 |
| MJS Building Services (Ipswich) Limited | Construction | 2012 |
| Mjölnir Products Ltd | Wholesale & retail | 2022 |
| MK Excel Ltd | Real estate | 2020 |
| MK Group Services Limited | Transport & logistics | 2019 |
| MK IP Home Care Solutions Limited | Construction | 2026 |
| MK Leeder Ltd | Real estate | 2025 |
| MK Pallets Limited | Transport & logistics | 2025 |
| MK Professional Recruitment Solutions Limited | Administrative & support | 2011 |
| MKH Catering Limited | Hospitality | 2023 |
| Mkhn Limited | Wholesale & retail | 2025 |
| Mklogistic Services Ltd | Transport & logistics | 2024 |
| Mktox & Co Ltd | Professional & scientific | 2019 |
| ML UK Group Ltd | Hospitality | 2025 |
| MLF Cars Ltd | Wholesale & retail | 2020 |
| MLM Hairdressing Limited | Other services | 2009 |
| MLM Travels Ltd | Transport & logistics | 2026 |
| MLR Locums Limited | Health & social care | 2015 |
| MLS Fishing Competitions Ltd | Administrative & support | 2025 |
| Mluk Trans Ltd | Transport & logistics | 2026 |
| MLW Aviation Consultancy Limited | Administrative & support | 2026 |
| MM Expert Logistics Ltd | Transport & logistics | 2024 |
| MM Retreats Ltd | Hospitality | 2023 |
| Mm&A Ltd | Transport & logistics | 2025 |
| MM2 Insights Ltd | Professional & scientific | 2026 |
| MMC Innovations LLP | | 2014 |
| MMM Drive Ltd | Transport & logistics | 2025 |
| MMP Commercial Ltd | Financial services | 2023 |
| MMQ Properties Ltd | Real estate | 2021 |
| MMR Roofing Limited | Construction | 2012 |
| MN Auto Ipswich Ltd | Wholesale & retail | 2025 |
| MN Co-Curricular Ltd | Arts & recreation | 2017 |
| MN Land Projects Ltd | Administrative & support | 2014 |
| MNA Trans Ltd | Transport & logistics | 2020 |
| MNB LAY Ltd | Construction | 2022 |
| Mnlt Electrical Ltd | Construction | 2023 |
| Mobile Crafts Ltd | Wholesale & retail | 2024 |
| Mobile Data Solutions Ltd | Information & communication | 1999 |
| Mobile Eco Ltd | Wholesale & retail | 2025 |
| Mobile Refurbs Limited | Construction | 2018 |
| Mobile Tyres Doctor Ltd | Wholesale & retail | 2025 |
| Mobilien Ltd | Real estate | 2016 |
| Mobsec Ltd | Transport & logistics | 2026 |
| Mobytransport Ltd | Transport & logistics | 2021 |
| Moco Limited | Information & communication | 2002 |
| Mocon Civils Ltd | Construction | 2023 |
| Modawi Ltd | Transport & logistics | 2023 |
| Modece Architects Ltd | Professional & scientific | 2016 |
| Modece Property Ltd | Real estate | 2019 |
| Model Farm Combs Management Limited | Households | 1995 |
| Model Group Limited Limited | Administrative & support | 2008 |
| Model Pawn Shop Ltd | Wholesale & retail | 2021 |
| Model Signage Limited | Administrative & support | 2008 |
| Model Signage Solutions Limited | Manufacturing | 2009 |
| Modelling Business Excellence Limited | Manufacturing | 2013 |
| Modern and Luxury Furniture Ltd | Wholesale & retail | 2023 |
| Modern Eco Living Limited | Construction | 2001 |
| Modern Glaze Ltd | Construction | 2024 |
| Modernadri Ltd | Wholesale & retail | 2020 |
| Modestrans Limited | Transport & logistics | 2017 |
| Modified Dubs Ltd | Manufacturing | 2025 |
| Modify Hair Lounge Ltd | Other services | 2019 |
| Mofemi Limited | Professional & scientific | 2011 |
| Moffat & Sons Limited | Administrative & support | 2018 |
| Mogal Ltd | Wholesale & retail | 2025 |
| Mogfriends Ltd | Other services | 2023 |
| Moksa Limited | Other services | 2019 |
| Moldoveanu Cleaning Ltd | Administrative & support | 2022 |
| Molecule Home Fragrance Ltd | Wholesale & retail | 2022 |
| Molina Express Ltd. | Transport & logistics | 2019 |
| Molina International Trading Ltd | Wholesale & retail | 2022 |
| Molina Properties Ltd | Real estate | 2016 |
| Moloko Bar Ipswich Ltd | Hospitality | 2025 |
| Moltaben Property Ltd | Extraterritorial | 2021 |
| MOM24 Ltd | Real estate | 2024 |
| Momentum Edge Ltd | Information & communication | 2026 |
| Momentum Energy Ltd | Other services | 2019 |
| Momi Services Ltd | Administrative & support | 2015 |
| Monad Fragrances Ltd | Wholesale & retail | 2026 |
| Monarch Rise (Layer DE LA Haye) Management Company Limited | Households | 2024 |
| Moneyangel Ltd | Information & communication | 2026 |
| Monimar Catering and Events Ltd | Hospitality | 2025 |
| Monimar Limited | Hospitality | 2024 |
| Monira Holdings Limited | Financial services | 2017 |
| Monledon Limited | Wholesale & retail | 2021 |
| Monolay Limited | Information & communication | 2023 |