| My Auto Assist Ltd | Wholesale & retail | 2024 |
| My Burrito Kitchen Limited | Manufacturing | 2025 |
| My Catering Bristol Ltd | Hospitality | 2024 |
| My Cause UK C.I.C. | Other services | 2017 |
| My Coaching Notes Ltd | Information & communication | 2024 |
| My Coffee Co Bristol Ltd | Hospitality | 2016 |
| My Decorating Services Ltd | Construction | 2022 |
| My Dream House Limited | Real estate | 2022 |
| My Ephie Ltd | Wholesale & retail | 2022 |
| My EYE Clinic Ltd | Extraterritorial | 2015 |
| My Family Legacy Ltd | Professional & scientific | 2018 |
| My Food Bay Ltd Limited | Hospitality | 2025 |
| My Franchise Limited | Wholesale & retail | 2014 |
| My Garage Automotive Limited | Wholesale & retail | 2012 |
| My Globe Ltd | Wholesale & retail | 2007 |
| My Green Cleaner Ltd | Administrative & support | 2009 |
| My Green Pension Ltd | Financial services | 2025 |
| My Life Wadsworth Limited | Health & social care | 2008 |
| My Message Works Limited | Administrative & support | 2017 |
| My MIX Ltd | Hospitality | 2025 |
| My New Car Limited | Wholesale & retail | 2017 |
| My Next PAD Ltd | Extraterritorial | 2009 |
| My Organic Clean Ltd | Administrative & support | 2019 |
| My Personal Economy Limited | Real estate | 2019 |
| My Personal Marketing Limited | Information & communication | 2004 |
| My Sister Ltd | Wholesale & retail | 2022 |
| My Slate Limited | Information & communication | 2023 |
| My Staycations Ltd | Real estate | 2023 |
| My Style Barber U.K Ltd | Other services | 2024 |
| My System Ltd | Information & communication | 2021 |
| My Tax Bill Limited | Extraterritorial | 2014 |
| My Thai Kitchen Ltd | Education | 2018 |
| My VET Ltd | Extraterritorial | 1999 |
| My Village Architect Ltd | Professional & scientific | 2024 |
| My Way Care SW Ltd | Health & social care | 2022 |
| My Web Designer Ltd | Information & communication | 2011 |
| My&S Ltd | Wholesale & retail | 2019 |
| My-Couch Ltd | Other services | 2021 |
| My-Craft Spandex Limited | Wholesale & retail | 2012 |
| My@S Bristol Ltd | Administrative & support | 2024 |
| Myadventurediary Limited | Information & communication | 2021 |
| Myah Developments Ltd | Construction | 2025 |
| Myanmar Trust UK | Public administration | 2018 |
| Myasessential&Co Ltd | Wholesale & retail | 2026 |
| Myblock Limited | Construction | 2019 |
| Mybuild Construction Ltd | Construction | 2019 |
| Mybuild Project Ltd | Construction | 2023 |
| Mybuild Renewables and Plumbing Ltd | Construction | 2024 |
| Mycashline One Limited | Other services | 2022 |
| Mycashline Three Limited | Other services | 2024 |
| Mycashline Two Limited | Other services | 2023 |
| Myclickbasket Ltd | Wholesale & retail | 2025 |
| Mycobiome Ltd | Agriculture & fishing | 2024 |
| Mycoforge Ltd | Wholesale & retail | 2025 |
| Mycpc Training Ltd | Education | 2026 |
| Mycranio Limited | Health & social care | 2018 |
| Mycrogreens Ltd | Agriculture & fishing | 2025 |
| Myers Safety Systems Ltd | Administrative & support | 2023 |
| Myers-Insole Local Learning Community Interest Company | Education | 2005 |
| Myface Aesthetics Limited | Health & social care | 2017 |
| Myisshin Foods Limited | Manufacturing | 2025 |
| Myitheroes Ltd | Information & communication | 2023 |
| Mykor Ltd | Manufacturing | 2021 |
| Mykos Technologies Limited | Professional & scientific | 2021 |
| Mylegacy Choice Ltd | Professional & scientific | 2024 |
| Myler EPC & Retrofit Ltd | Professional & scientific | 2026 |
| Myles Mayne Consulting Limited | Professional & scientific | 2007 |
| Myles Thomas Consulting Ltd | Administrative & support | 2022 |
| Mylo's Chicken Ltd | Hospitality | 2026 |
| Mymal Healthcare Services Ltd | Wholesale & retail | 2025 |
| Mynd Drinks Ltd | Wholesale & retail | 2021 |
| Mynestbox Limited | Information & communication | 2020 |
| Mynetgoals Ltd | Information & communication | 2024 |
| Myoctober Ltd | Hospitality | 2026 |
| Myosync Cinic Limited | Health & social care | 2025 |
| Myoxygen Ltd | Information & communication | 2001 |
| Mypal Web Solutions Limited | Information & communication | 2009 |
| Mypharm Ltd | Wholesale & retail | 2023 |
| Myphysio Services Limited | Health & social care | 2016 |
| Myproper-T Ltd | Real estate | 2021 |
| Myqa Certifications Ltd | Professional & scientific | 2025 |
| Myrah Construct Ltd | Construction | 2022 |
| Myrah Construction Limited | Construction | 2018 |
| Myrah Electrical Limited | Energy | 2019 |
| Myrddan Limited | Real estate | 2025 |
| Myriad Facilities Group Ltd | Administrative & support | 2019 |
| MYROOMS4YOU Ltd | Real estate | 2013 |
| Myrrh Ltd | Transport & logistics | 2024 |
| Myrrh Tree Education and Consultancy Limited | Professional & scientific | 2018 |
| Myrrh Tree UK CIC | Education | 2022 |
| Myrsky Professionals Ltd | Professional & scientific | 2022 |
| Myrtle Design & Build Limited | Real estate | 2025 |
| Myrtle Farm Properties Ltd | Households | 2020 |
| Myrtle Farm Residential Properties Limited | Real estate | 2021 |
| Myrtle Theatre Company Ltd | Arts & recreation | 2025 |
| Myrtle Tree Events Limited | Hospitality | 2013 |
| Myrtle Tree Holdings Limited | Construction | 1970 |
| Mysig Properties Ltd | Real estate | 2020 |
| Mystery Media Group LLP | | 2023 |
| Mystery Media Limited | Professional & scientific | 2023 |