| Millar Composite Services Ltd | Manufacturing | 2025 |
| Millar Macduff Ltd | Arts & recreation | 2026 |
| Millar Place Ltd | Real estate | 2025 |
| Millar Property Development Ltd | Real estate | 2026 |
| Millard Law Limited | Professional & scientific | 2024 |
| Millarndt Ltd | Professional & scientific | 2019 |
| Millarworld Limited | Information & communication | 2009 |
| Millbank Medical Imaging Limited | Health & social care | 2012 |
| Millbrook Nordic L.P. | | 2016 |
| Millbrow United LP | | 2014 |
| Millbry 72 Ltd. | Financial services | 1998 |
| Millburn Estates Henley Limited | Professional & scientific | 2012 |
| Millburn Estates Limited | Construction | 1999 |
| Millburn World Travel Services Limited | Transport & logistics | 1984 |
| Millenio Business Ltd. | Transport & logistics | 2010 |
| Millenium Business LP | | 2015 |
| Millenium Networks Ltd | Information & communication | 2019 |
| Millennial Trading Ltd | Wholesale & retail | 2025 |
| Millennium Capital LP | | 2013 |
| Millennium Group LP | | 2018 |
| Millennium Projects LP | | 2014 |
| Millennium Shipping & Co. | | 2008 |
| Millennium Star Properties Ltd | Real estate | 2023 |
| Millennium Taxis Ltd. | Professional & scientific | 1999 |
| Millennium Wind Energy Limited | Energy | 2003 |
| Miller & Associates Limited | Administrative & support | 2017 |
| Miller Edinburgh Ltd | Real estate | 2022 |
| Miller Hendry (Trustees) Limited | Professional & scientific | 2004 |
| Miller Hendry Limited | Professional & scientific | 1987 |
| Miller Homes Cambuslang Limited | Construction | 2008 |
| Miller M2 (Kirkcaldy) Limited | Construction | 2021 |
| Miller M2 (Maddiston) Limited | Construction | 2021 |
| Miller Property Limited | Real estate | 2017 |
| Millerhill LP | | 2016 |
| Millerhill Properties Limited | Real estate | 1976 |
| Millerhill Taxis Ltd. | Transport & logistics | 2004 |
| Millerson Partners LP | | 2012 |
| Millglen Associates Limited | Real estate | 2006 |
| Millhouse Investments LP | | 2013 |
| Millidge Ltd | Other services | 2025 |
| Millies Munchies (Scot) Ltd | Hospitality | 2021 |
| Milligan Communications Ltd | Professional & scientific | 2019 |
| Millimax Trading LP | | 2011 |
| Milline Import LP | | 2015 |
| Million Bule Limited | Energy | 2023 |
| Million Cabs Ltd | Transport & logistics | 2025 |
| Milliteks Industries LP | | 2011 |
| Millour Hill Community Wind Co Ltd | Energy | 2008 |
| Mills & Multon (Edinburgh) Limited | Real estate | 1981 |
| Mills (Edinburgh) Holdings Limited | Real estate | 2024 |
| Mills (Edinburgh) Limited | Real estate | 2024 |
| Mills and Multon Group Limited | Real estate | 2024 |
| Mills Co-Investment Carry LP | | 2019 |
| Mills Multon Property Partnership Limited | Real estate | 2024 |
| Millteks Management LP | | 2012 |
| Millwall Consulting LP | | 2017 |
| Millwall Services LP | | 2017 |
| Millwall Trade LP | | 2017 |
| Millwick Estate LP | | 2014 |
| Milly LAM Ltd | Information & communication | 2025 |
| Milly's Kitchen Ltd | Wholesale & retail | 2019 |
| Milly's Property Ltd | Real estate | 2021 |
| Milne Management Ltd T/A Milne Security Services Ltd | Administrative & support | 2001 |
| Milne Properties Limited | Extraterritorial | 2004 |
| Milne Trading Company Ltd | Professional & scientific | 2025 |
| Milnesec Ltd | Professional & scientific | 2013 |
| Milnova Property Ltd | Households | 2024 |
| Milntoun Property Services Ltd | Real estate | 2025 |
| Milo Consulting International LP | | 2022 |
| Miloneg LP | | 2018 |
| Milos Management Ltd | Real estate | 2021 |
| Milos Trading Ltd | Hospitality | 2025 |
| Milrae Fire Limited | Construction | 2025 |
| Milrond Invest LP | | 2014 |
| Milroyse Trading LP | | 2013 |
| Milson Interim Management Limited | Professional & scientific | 2002 |
| Milter Sales LP | | 2012 |
| Miltime Limited | Hospitality | 2004 |
| Milton (SC) 2 Limited | Professional & scientific | 2009 |
| Milton (SC) Limited | Professional & scientific | 2009 |
| Milton Assets LP | | 2015 |
| Milton Bath Repair, Shower & Sink Repair Ltd | Other services | 2024 |
| Milton Developers Ltd | Construction | 2026 |
| Milton FRY Ltd | Hospitality | 2019 |
| Milton FRY Takeaway Ltd | Hospitality | 2023 |
| Milton Group Car Services Limited | Administrative & support | 2025 |
| Milton Holdings Ltd | Hospitality | 2019 |
| Milton Media Ltd | Professional & scientific | 2015 |
| Milton Mill Investments Limited | Real estate | 2026 |
| Milton Overseas Limited | Professional & scientific | 2014 |
| Milton Private Hire Ltd | Transport & logistics | 2023 |
| Milton United LP | | 2012 |
| Miluar Property Investments Ltd | Administrative & support | 2021 |
| Milvale Developments Limited | Construction | 2022 |
| Milyn and Associates Limited | Real estate | 1992 |
| Mima'T by Ivanna Limited | Other services | 2025 |
| Mimi Henry Ltd | Real estate | 2025 |
| Mimi's Teahouse Ltd | Hospitality | 2010 |
| Mimia Ltd | Real estate | 2026 |
| Mimo Lettings Ltd | Real estate | 2021 |