| MIK (Emea) Ltd | Information & communication | 2006 |
| Mikaeel Ltd | Hospitality | 2020 |
| Mikami Projects Ltd | Wholesale & retail | 2024 |
| Mikata Ltd | Administrative & support | 2023 |
| Mike Cooper Photographer Ltd | Extraterritorial | 2014 |
| Mike COX Building & Maintenance Services Limited | Construction | 2001 |
| Mike Doherty Ltd | Construction | 2017 |
| Mike Draper Shopfitting Limited | Construction | 2005 |
| Mike Dunn Consulting Ltd | Information & communication | 2023 |
| Mike Gauntlett (Truck Equipment) Limited | Manufacturing | 1980 |
| Mike Harbord Opticians Limited | Health & social care | 2006 |
| Mike Hemmings (Builders) Limited | Extraterritorial | 2007 |
| Mike Howard Ltd | Construction | 2013 |
| Mike Howe Transport Ltd | Transport & logistics | 2023 |
| Mike Lebanese Kitchen Ltd | Hospitality | 2021 |
| Mike Madge Motor Repairs Limited | Wholesale & retail | 2006 |
| Mike Migas Ltd | Arts & recreation | 2018 |
| Mike Mooney Electrical Ltd | Construction | 2024 |
| Mike Sharp Construction Ltd | Construction | 2020 |
| Mikebeastall Ltd | Information & communication | 2024 |
| Mikem Furniture Limited | Administrative & support | 2014 |
| Mikemax Ltd | Health & social care | 2026 |
| Miki & SON Ltd | Transport & logistics | 2021 |
| Miki RUM Ltd | Manufacturing | 2019 |
| Mikos Transport Services Ltd | Transport & logistics | 2023 |
| Mikys Autos Limited | Wholesale & retail | 2018 |
| MIL TU Fit Manufacturing Limited | Professional & scientific | 2013 |
| Mil-Tu-Fit Trustees Limited | Professional & scientific | 2025 |
| Milair Aviation Limited | Professional & scientific | 2012 |
| Milanese Hair Salon Ltd | Other services | 2022 |
| Milano's Pizza Keynsham Ltd | Hospitality | 2024 |
| Milanovic Knowles Limited | Wholesale & retail | 2001 |
| Milbury Logistics Ltd | Transport & logistics | 2019 |
| Milburys Estate Agents Ltd | Real estate | 2011 |
| Milburys Property Letting & Management Ltd | Real estate | 2011 |
| Milburys Property Solutions Ltd | Construction | 2013 |
| Milburys Tenancy Agreements Ltd | Real estate | 2004 |
| Mild to Wild Limited | Wholesale & retail | 2003 |
| Mildon PUB Limited | Hospitality | 2014 |
| Mildren Software Ltd | Information & communication | 2025 |
| Mile OFF Ltd | Other services | 2023 |
| Mile One Global Limited | Wholesale & retail | 2026 |
| Mile Straight Sports and Social Club Limited | Arts & recreation | 2002 |
| Milee Build Ltd | Construction | 2013 |
| Mileforce Transport Ltd | Transport & logistics | 2025 |
| Milehouse Dental Care Limited | Health & social care | 2012 |
| Milenya Ltd | Real estate | 2023 |
| Miles Ahead Care Limited | Health & social care | 2020 |
| Miles Ahead Entertainment Ltd | Information & communication | 2021 |
| Miles and Davey Motor Services Limited | Wholesale & retail | 2019 |
| Miles Architectural Ironmongery Limited | Wholesale & retail | 1987 |
| Miles Close RTM Company Ltd | Households | 2021 |
| Miles Court Management Company Limited | Households | 2003 |
| Miles Data Retrieval Limited | Transport & logistics | 2009 |
| Miles Franklin Group Ltd | Real estate | 2016 |
| Miles Property Consultants Limited | Real estate | 2016 |
| Miles Property Investments Limited | Real estate | 2020 |
| Miles Services Limited | Hospitality | 2025 |
| Miles Studios London Ltd | Extraterritorial | 2023 |
| Milesfarrall-Miles Limited | Construction | 2018 |
| Milestone Builds Limited | Construction | 2014 |
| Milestone Engineering Ltd | Professional & scientific | 2025 |
| Milestones Flats (Bath) Limited | Real estate | 1974 |
| Milestones Trust | Health & social care | 1986 |
| Mileutis Limited | Professional & scientific | 2016 |
| Milford Avenue Cafe Ltd | Hospitality | 2025 |
| Milford Finance Project Management Limited | Professional & scientific | 2013 |
| Milford Grange (Long Ashton) Management Company Limited | Households | 2005 |
| Milgi Market Ltd | Hospitality | 2016 |
| Milhouse Analytics Ltd | Arts & recreation | 2026 |
| Milk BUN Ltd | Hospitality | 2024 |
| Milk Deli Ltd | Hospitality | 2025 |
| Milk Teeth Ltd | Hospitality | 2026 |
| Mill END Wharf Management Company Limited | Households | 2003 |
| Mill Farm Clay Pigeon Shoot Limited | Arts & recreation | 2009 |
| Mill Island Boating Limited | Real estate | 2022 |
| Mill Lane (Bedminster) Management Ltd | Households | 2024 |
| Mill Lane Automotive Ltd. | Wholesale & retail | 2012 |
| Mill Meadows (Kempsey) Management Company Limited | Households | 2025 |
| Millar Build Limited | Construction | 2010 |
| Millar House Management (Bristol) Limited | Hospitality | 1980 |
| Millard Consultancy Services Limited | Professional & scientific | 2016 |
| Millbridge Court Limited | Hospitality | 2016 |
| Millbridge Investment Co. Ltd | Professional & scientific | 2021 |
| Millbrook (Wotton Under Edge) Management Company Limited | Households | 2013 |
| Millcroft (CB1) RTM Company Limited | Households | 2025 |
| Millennium Dental Care Limited | Health & social care | 2008 |
| Millennium Health Management Limited | Real estate | 2019 |
| Millennium Skies Limited | Households | 2022 |
| Miller Group Properties Ltd | Real estate | 2023 |
| Miller Independent Property Management Ltd | Administrative & support | 2023 |
| Miller Properties (Bristol) Ltd | Real estate | 2025 |
| Miller-Mar Signature Travel Limited | Administrative & support | 2026 |
| Millers Hair and Beauty Limited | Other services | 2015 |
| Millers Way (Middleton Cheney) Management Company Limited | Households | 2022 |
| Millford QI Ltd | Professional & scientific | 2026 |
| Millhill Warehousing Limited | Transport & logistics | 2002 |
| Millian Ltd | Real estate | 2024 |
| Millie & Belle Ltd | Agriculture & fishing | 2018 |
| Millie's Garden: Early Years Hub Ltd | Education | 2023 |