| Marion Court Management Company Limited(The) | Households | 1963 |
| Maxlight Holdings Limited | Financial services | 2018 |
| Maxlight Limited | Manufacturing | 2011 |
| Mcaleer Electrical Ltd | Construction | 2024 |
| Mebruk Construction Ltd | Construction | 2025 |
| Medexport London Ltd | Manufacturing | 2021 |
| Mercers Equities Ltd | Real estate | 2025 |
| Mezna Travel Ltd | Administrative & support | 2021 |
| Mini Investment Group Limited | Real estate | 2016 |
| Miwhip Holdings Ltd | Financial services | 2017 |
| Miwhip Leasing Ltd | Administrative & support | 2018 |
| Miwhip Ltd | Transport & logistics | 2017 |
| Mondelink Travel Limited | Transport & logistics | 2023 |
| Money Manager Software Limited | Administrative & support | 1992 |
| Morgan Training Solutions Limited | Transport & logistics | 2012 |
| Morleys Acton Ltd | Hospitality | 2020 |
| Movement Makers CIC | Education | 2024 |
| Mslordebeauty Ltd | Other services | 2024 |
| MSTRADE2024 Limited | Wholesale & retail | 2024 |
| Murayadskitchen Limited | Hospitality | 2025 |
| Muslim Rose Welfare Limited | Health & social care | 2014 |
| Namvel Estates Limited | Administrative & support | 1948 |
| Napta Languages Ltd | Professional & scientific | 2026 |
| Nile Palace Ltd | Health & social care | 2020 |
| Nmdk Training and Consultancy Ltd | Professional & scientific | 2020 |
| North Star Care Quality & Practice Ltd | Professional & scientific | 2026 |
| Northwood Consulting Limited | Wholesale & retail | 2002 |
| Olivio Aroma Limited | Hospitality | 2026 |
| Onsite Telecommunications Ltd | Information & communication | 2022 |
| Parrett Trading Limited | Financial services | 2003 |
| Pellex Ltd | Administrative & support | 2024 |
| Picton Street Properties Ltd | Real estate | 2023 |
| PN Contracts Limited | Construction | 2014 |
| Pneuma Partners Limited | Information & communication | 2020 |
| Postaroom Ltd | Hospitality | 2021 |
| Premier Property Agents Ltd | Households | 2016 |
| Presentedby Ltd | Wholesale & retail | 2022 |
| Pressplay Media and Entertainment Ltd | Information & communication | 2017 |
| Pressplay Music Publishing Ltd | Information & communication | 2018 |
| Pressplay Records Ltd | Information & communication | 2018 |
| Prime Plumbers & Heating Ltd | Construction | 2019 |
| Proportions Design Studio Ltd | Professional & scientific | 2017 |
| Psychological Neuroscience Ltd | Health & social care | 2021 |
| Ramez Limited | Wholesale & retail | 2024 |
| Ramsay Road Limited | Households | 2000 |
| Rashan London Ltd | Education | 2024 |
| Raven Consultancy Services Limited | Professional & scientific | 2006 |
| Rayan & Co London Ltd | Wholesale & retail | 2026 |
| Rayan Grocery Ltd | Wholesale & retail | 2025 |
| Reda Motors Ltd | Wholesale & retail | 2021 |
| Reddy Siddiqui Management Limited | Professional & scientific | 1994 |
| Regency PR Topco Limited | Real estate | 2025 |
| Repeat Performance Multimedia Ltd | Manufacturing | 2013 |
| RF Sound Limited | Information & communication | 2019 |
| Rigby Lane Holdco Limited | Real estate | 2025 |
| Rigby Lane Propco Limited | Real estate | 2025 |
| Rightoffer Limited | Administrative & support | 1986 |
| RIN Developments Ltd | Construction | 2017 |
| RIN Intellectual Holdings Ltd | Financial services | 2017 |
| RIN Investments Ltd | Financial services | 2017 |
| Rinon Group Ltd | Health & social care | 2019 |
| Rinon Ltd | Real estate | 2022 |
| ROBERTHUWJENKINS29 Limited | Professional & scientific | 2026 |
| Rockerdale Studios Limited | Information & communication | 2016 |
| Romney Brooks Limited | Professional & scientific | 2017 |
| Rotinbrew London Limited | Hospitality | 2026 |
| Roxdent Ltd | Health & social care | 2014 |
| ROY Parsons Limited | Information & communication | 1992 |
| Rrown Ltd | Wholesale & retail | 2024 |
| S&A Global Mart Ltd | Wholesale & retail | 2025 |
| S&E Enterprise Ltd | Hospitality | 2024 |
| S. Budner Limited | Real estate | 1949 |
| Sangeet Ltd | Wholesale & retail | 2017 |
| Separator Innovation Limited | Manufacturing | 2012 |
| Shabo Holdings Ltd | Construction | 2025 |
| Shadi Food Center Limited | Hospitality | 2022 |
| Sharan Property Investments Ltd | Real estate | 2017 |
| Shire Driver Training Ltd | Education | 2025 |
| Shiva Cleaning Ltd | Other services | 2014 |
| Sign a Craft & Co Ltd | Manufacturing | 2025 |
| SJ Villas Limited | Administrative & support | 2007 |
| Skin Thrive Ltd | Wholesale & retail | 2025 |
| Skipley Residents Company Limited | Professional & scientific | 1988 |
| Skylight Digital Marketing Ltd | Information & communication | 2022 |
| Sneaker King Limited | Wholesale & retail | 2016 |
| Snkr BAG Ltd | Wholesale & retail | 2017 |
| SO Very NOT Bland Housing Ltd | Real estate | 2019 |
| Sofiane Import Service Ltd | Wholesale & retail | 2025 |
| Sofresh Produce Ltd | Wholesale & retail | 2019 |
| Solstice of London (West) Ltd | Construction | 2021 |
| Somali School Acton Ltd | Education | 2016 |
| Soulful Food London Ltd | Hospitality | 2025 |
| Southcote Developments Ltd | Construction | 2014 |
| Sphinx Grill Ltd | Hospitality | 2019 |
| Spisc Limited | Professional & scientific | 2017 |
| Star Defined Ltd | Wholesale & retail | 2022 |
| Star Town Services Limited | Real estate | 2017 |
| Stpc Limited | Real estate | 2010 |
| Takis Studio | Arts & recreation | 2007 |
| Tamar Dada Productions Limited | Information & communication | 2009 |