| Lechmere Investments Limited | Real estate | 2022 |
| Levels Ahead Flooring Ltd | Construction | 2026 |
| Light Global Limited | Other services | 2018 |
| London Crest Property Advisory Ltd | Other services | 2025 |
| LS Entertainment Limited | Information & communication | 2022 |
| LUX Living Limited | Real estate | 2014 |
| M2 Traders Ltd | Wholesale & retail | 2016 |
| Mabesa Ltd | Real estate | 2025 |
| Macro Business Development Limited | Administrative & support | 2016 |
| Manage My Block Limited | Other services | 2022 |
| Mannton Private Finance Ltd | Financial services | 2024 |
| Marbell Holdings Ltd | Financial services | 2022 |
| Marbell Properties Ltd | Real estate | 2024 |
| March Investment Properties Limited | Real estate | 2016 |
| Marnmade Ltd | Information & communication | 2024 |
| Marshall Sterling Investment Management Limited | Financial services | 2014 |
| Mase Sarai Limited | Real estate | 2021 |
| Mase Sarai Partnership LLP | | 2021 |
| Matrix Learning Ltd | Education | 2024 |
| Maverick Systems Limited | Information & communication | 2017 |
| Maximum Property LLP | | 2018 |
| Maximum Property Management Limited | Real estate | 2017 |
| Mayatris Limited | Information & communication | 2009 |
| Mayfair London Rays Ltd | Wholesale & retail | 2026 |
| Mclean & Southgate LLP | | 2019 |
| Mcskeens Partnership LLP | | 2020 |
| Mcskeens Property Portfolio Ltd | Real estate | 2020 |
| Medasa Ltd | Real estate | 2021 |
| Medasa Partnership LLP | | 2021 |
| Medaxis London Limited | Wholesale & retail | 2026 |
| Melrose Immigration Lawyers Ltd | Administrative & support | 2022 |
| Mercieca Family Partnership LLP | | 2022 |
| Metal Precision UK Limited | Manufacturing | 2000 |
| Mila Chai Limited | Professional & scientific | 2022 |
| MMM Shipping Services Limited | Professional & scientific | 2013 |
| Moneysuite Ltd | Information & communication | 2009 |
| Montrose Advisory Ltd | Professional & scientific | 2025 |
| Morgan Property Rentals LLP | | 2022 |
| Morgan Rentals Ltd | Real estate | 2022 |
| Morgan Stanley & Co. International PLC | Financial services | 1986 |
| Morgan Stanley Investment Management Limited | Financial services | 1986 |
| Morgan Stanley Securities Limited | Financial services | 1986 |
| Morgan Stanley UK Group | Financial services | 1976 |
| Morgan WEB3 Labs Ltd | Financial services | 2025 |
| Morstan Nominees Limited | Financial services | 1986 |
| MPN Technologies Limited | Information & communication | 2023 |
| MSP Foods N17 Ltd | Hospitality | 2025 |
| MW Restaurants Limited | Other services | 2014 |
| My Clinical Outcomes Ltd | Health & social care | 2011 |
| Mythrix Ltd | Professional & scientific | 2026 |
| Nagpal Family Partnership LLP | | 2021 |
| Napier-Munn Family Partnership LLP | | 2020 |
| Narborough Chipstead Ltd | Financial services | 2025 |
| Nash Court Retail Limited | Construction | 2001 |
| Netley Central Limited | Energy | 2023 |
| Netley North Gridco Limited | Energy | 2019 |
| New Kent Road I Ltd | Real estate | 2024 |
| Nexgen Partners Ltd | Professional & scientific | 2018 |
| North Colonnade Limited | Construction | 2007 |
| Nova Finance Group Ltd | Information & communication | 2025 |
| Number Seven Food Technology Limited | Wholesale & retail | 2019 |
| Nunhead Lane Ltd | Real estate | 2025 |
| NW Media Publishing UK Ltd | Information & communication | 2022 |
| Objectway Limited | Information & communication | 1992 |
| Oculus Asset Management Ltd | Real estate | 2021 |
| Oculus Asset Management Partnership LLP | | 2021 |
| Omalicha Restaurant Limited | Hospitality | 2025 |
| Osmoston Limited | Financial services | 2021 |
| OUT & OUT Original Ltd | Wholesale & retail | 2012 |
| Paradigm Risk Dynamics Limited | Information & communication | 2017 |
| Pearl Bridging Limited | Financial services | 2021 |
| Permabuild Ltd | Construction | 2026 |
| Perry House Ltd | Real estate | 2022 |
| Peter Egner Associates Limited | Professional & scientific | 2004 |
| Peterborough House Ltd | Real estate | 2022 |
| Petrichor Estates Ltd | Real estate | 2021 |
| Phone Secretary Ltd | Administrative & support | 2024 |
| Pieterse Consulting Digital Solutions Ltd | Administrative & support | 2016 |
| Plateau Restaurant Limited | Hospitality | 2002 |
| Platform 365 for Education Ltd | Information & communication | 2020 |
| Platform 365 Limited | Information & communication | 2005 |
| PM Consultancy Global Limited | Administrative & support | 2012 |
| Precision Metal UK Ltd | Financial services | 2023 |
| Prescient Consulting Ltd | Administrative & support | 2013 |
| Presidents Choice Limited | Administrative & support | 2011 |
| Prime Chefs Ltd | Other services | 2025 |
| Pro 4071 Ltd | Professional & scientific | 2006 |
| Promin Aerospace Ltd | Manufacturing | 2022 |
| Puri Real Estate Limited | Real estate | 2021 |
| Quality Sales Leads Ltd | Other services | 2011 |
| Quaneqo Group Ltd | Other services | 2023 |
| Quant Tekel Ltd | Information & communication | 2024 |
| Quinine Cybersecurity Ltd | Information & communication | 2025 |
| RA Psychology Limited | Professional & scientific | 2015 |
| Rathmell Family Partnership LLP | | 2021 |
| Rattray Family Holdings Ltd | Real estate | 2021 |
| Rayzor Edge Films Ltd | Information & communication | 2016 |
| Readon Limited | Other services | 2018 |
| Real Tech Services Limited | Wholesale & retail | 2018 |
| Really Silky Moves LLP | | 2020 |