| My Fortune LS6 Ltd | Hospitality | 2020 |
| My Golden Ltd | Hospitality | 2020 |
| My Green Fairy Ltd | Wholesale & retail | 2024 |
| My Growth Engine Limited | Information & communication | 2022 |
| My Gym Equipment Ltd | Administrative & support | 2022 |
| My HIP and Knee Limited | Health & social care | 2012 |
| My Homecare (Leeds) Ltd | Health & social care | 2018 |
| My Homecare (Yorkshire) Ltd | Health & social care | 2016 |
| My Horizon Care Ltd | Health & social care | 2019 |
| My Identity Clothing Limited | Wholesale & retail | 2025 |
| My Jewel Box Ltd | Wholesale & retail | 2023 |
| My Kampung Ltd | Wholesale & retail | 2021 |
| My Leeds Accountant Ltd | Professional & scientific | 2013 |
| My Leftovers Ltd | Hospitality | 2026 |
| My Legal Edge Limited | Professional & scientific | 2024 |
| My Legal Solutions Limited | Administrative & support | 2019 |
| My Link Digital Ltd | Professional & scientific | 2022 |
| My Little Kitchen Leeds Ltd | Hospitality | 2024 |
| My Moortown Tandoori Ltd | Hospitality | 2019 |
| My Mortgage Manager Limited | Extraterritorial | 2018 |
| My Mortgage Team Ltd | Financial services | 2026 |
| My Moto (Leeds) Limited | Wholesale & retail | 2015 |
| My Motor Smart Limited | Wholesale & retail | 2021 |
| My Name Changed Ltd | Information & communication | 2026 |
| My Neighbourhood Health Ltd | Health & social care | 2026 |
| My Nest Building Surveys and Valuations Ltd. | Professional & scientific | 2012 |
| My Pando Limited | Professional & scientific | 2021 |
| My Personal Care Ltd | Health & social care | 2013 |
| My Place (Yorkshire) Ltd | Hospitality | 2018 |
| My Primos Ltd | Hospitality | 2024 |
| My Property Surveyors Ltd | Professional & scientific | 2021 |
| My Protection Guru Limited | Financial services | 2017 |
| My Psyche Hour Ltd | Health & social care | 2024 |
| My Pure Gelato Ltd | Manufacturing | 2022 |
| My Recruitment PAL Ltd | Hospitality | 2019 |
| My Rural Retreat Ltd | Construction | 2024 |
| My Single Friend Limited | Information & communication | 2004 |
| My Solar Pro Ltd | Information & communication | 2026 |
| My Spice and Grill Limited | Hospitality | 2019 |
| My Surveying Direct Ltd | Professional & scientific | 2025 |
| My Transport Limited | Transport & logistics | 2024 |
| My Travel Expert Limited | Administrative & support | 2020 |
| My UK Store Ltd | Wholesale & retail | 2024 |
| My Valeter Limited | Administrative & support | 2019 |
| My Vyne Limited | Extraterritorial | 2013 |
| My Wealth Plan Limited | Financial services | 2017 |
| My's Oriental Cuisine Ltd | Hospitality | 2022 |
| MYA LUX Stays Ltd | Real estate | 2026 |
| Mybearhugs Limited | Manufacturing | 2025 |
| Mychaai Leeds Ltd | Hospitality | 2025 |
| Mydaton Limited | Manufacturing | 1993 |
| Mydog Nutrition Limited | Wholesale & retail | 2020 |
| Mydonose Ltd | Wholesale & retail | 2016 |
| Mydr Capital Ltd | Other services | 2017 |
| Mydr Group 1 Holdings Ltd | Other services | 2017 |
| Mydr Properties Ltd | Other services | 2017 |
| MYE Properties Ltd | Real estate | 2026 |
| Myers Golden Data Storage Ltd | Information & communication | 2025 |
| Myexpert.Solutions Ltd | Information & communication | 2015 |
| Mygym Birkenhead Limited | Arts & recreation | 2023 |
| Myhello Ltd | Professional & scientific | 2024 |
| Myinternalrecruiter.Com Ltd | Administrative & support | 2017 |
| Mykaylas Cakes Limited | Wholesale & retail | 2012 |
| Mykonos Greece Limited | Hospitality | 2016 |
| Myla Grace Accountancy Limited | Professional & scientific | 2022 |
| Mylake Developments Limited | Construction | 2016 |
| Mylake Limited | Administrative & support | 2010 |
| Myland Brothers Home Extensions Ltd | Construction | 2020 |
| Myles & Dylan Ltd | Information & communication | 2013 |
| Myles Associates Limited | Professional & scientific | 2004 |
| Mylife Health Limited | Information & communication | 2025 |
| Mylo Group Limited | Real estate | 2025 |
| MYM Financial Services Limited | Financial services | 2022 |
| Mymoneycomparison.Com Ltd | Financial services | 2013 |
| Myne Green Consulting Ltd | Information & communication | 2016 |
| Mypathfinder Ltd | Administrative & support | 2025 |
| Mypersonaltrainer Limited | Health & social care | 2019 |
| Mypump Solutions Limited | Manufacturing | 2024 |
| Myrcha Corporation Limited | Real estate | 2016 |
| Myrh Ltd | Real estate | 2022 |
| Myriad Advisory Ltd | Administrative & support | 2016 |
| Myriam&Brielle Limited | Construction | 2017 |
| Myrtle & Maude Limited | Health & social care | 2016 |
| Myrtle and Evergreen Limited | Wholesale & retail | 2024 |
| Myrtle Grove Ltd | Other services | 2022 |
| Mysanto Ltd | Manufacturing | 2024 |
| Myseabay Limited | Extraterritorial | 2018 |
| Myshon Homes Ltd | Real estate | 2022 |
| Myshon Investment Management LLP | | 2026 |
| Myshon Limited | Administrative & support | 2017 |
| Mysteries Consults Ltd | Real estate | 2018 |
| Mystical Moon Leeds Ltd | Wholesale & retail | 2024 |
| Mysztrans Ltd | Transport & logistics | 2025 |
| Mytang Food Ltd | Hospitality | 2021 |
| Mytang Ltd | Hospitality | 2020 |
| Mytholm Stone Sales Limited | Mining & quarrying | 1951 |
| Mythos Talent Solutions Ltd | Administrative & support | 2026 |
| Mytum and Selby (Goole) Holdings Limited | Financial services | 2024 |
| Mytum and Selby (Goole) Limited | Water & waste | 2002 |
| Myvision Opticians Guiseley Ltd | Wholesale & retail | 2023 |