| Isted Property Management Company Limited | Households | 1981 |
| IVD MD Consulting Limited | Professional & scientific | 2021 |
| J P B Limited | Professional & scientific | 2015 |
| J.P.H Building Services Limited | Construction | 2011 |
| Jada Productions CIC | Arts & recreation | 2018 |
| JAG Training Limited | Education | 2014 |
| Jamclo Limited | Professional & scientific | 2014 |
| James Phillips & Co Limited | Financial services | 1994 |
| JBM Imaging Ltd | Health & social care | 2025 |
| JK Sandhu Ltd | Professional & scientific | 2018 |
| JL Robertus Limited | Health & social care | 2022 |
| Jmeh Holdings Limited | Construction | 2024 |
| Jmsm Investments Limited | Financial services | 2018 |
| John Wesley Court Headlease Limited | Households | 2016 |
| Jubilee Books.Co.Uk. Ltd | Education | 2010 |
| Jumy Solution Business Ltd | Health & social care | 2013 |
| Jupiter Aviation Technology Ltd | Information & communication | 2017 |
| JY Pro Plumbing & Heating Ltd | Construction | 2016 |
| Kalam & Co Eltham Ltd | Hospitality | 2019 |
| Kanchik Limited | Professional & scientific | 2017 |
| Kibri Contracting Ltd | Construction | 2020 |
| Koia Consulting Ltd | Information & communication | 2019 |
| KP Property Holding Limited | Real estate | 2016 |
| KPA Private Limited | Wholesale & retail | 2023 |
| L J Forsyth Pathology Services Ltd | Health & social care | 2026 |
| L J Travels Ltd | Administrative & support | 2018 |
| Langley Court (Eltham) Residents Association Limited | Professional & scientific | 1986 |
| Lead Learning Centre Ltd | Education | 2013 |
| Leading Interventional Oncology Network (Lion) Ltd | Health & social care | 2012 |
| Lemon Cleaning Limited | Administrative & support | 2014 |
| Libramount Limited | Professional & scientific | 1994 |
| Linea Court Ltd | Households | 2022 |
| Lipton Healthcare Limited | Health & social care | 2023 |
| Lisdek Limited | Health & social care | 2021 |
| Logan Construction (South East) Ltd | Construction | 1996 |
| Lomon Solutions Limited | Administrative & support | 2010 |
| London Cancer Care Ltd | Health & social care | 2020 |
| London Cataract and EYE Clinic Ltd | Health & social care | 2023 |
| London Fight Factory Ltd | Health & social care | 2012 |
| London Grapple Ltd | Arts & recreation | 2021 |
| London Hepatology Consulting Limited | Health & social care | 2020 |
| London Velo Ltd | Financial services | 2014 |
| Londonir Limited | Health & social care | 2024 |
| Lush Holiday Lets Ltd | Real estate | 2021 |
| Lysis Pro Limited | Real estate | 2024 |
| M J Galley Services Ltd | Professional & scientific | 2017 |
| M J Rooney Group Holdings Ltd | Financial services | 2025 |
| M Jajue Ltd | Administrative & support | 2015 |
| M.T. Futures Ltd | Financial services | 2010 |
| Maadhus Property Ltd | Real estate | 2022 |
| Majic Print Services Ltd | Wholesale & retail | 2014 |
| Mandito Ltd | Real estate | 2009 |
| Martin Mcmahon Consulting Limited | Information & communication | 1998 |
| Marylebone Medical Company Ltd | Health & social care | 2011 |
| Maudgil Limited | Health & social care | 2013 |
| Maynard Medical Associates Limited | Health & social care | 2022 |
| MCI London Ltd | Construction | 2021 |
| Md&L Jones Ltd | Health & social care | 2022 |
| Medics Xtra Ltd | Public administration | 2022 |
| Medlium Limited | Health & social care | 2021 |
| Mens Medica Ltd | Health & social care | 2019 |
| Mesa Care Services Limited | Administrative & support | 2025 |
| Misty Rose Tattoo Ltd | Arts & recreation | 2019 |
| ML-AM-430 LHR-01 Ltd | Construction | 2022 |
| Mlam - 81-85 High ST Ltd | Construction | 2023 |
| Molecular Hepatology Ltd | Health & social care | 2020 |
| Molecular Imaging Limited | Health & social care | 2023 |
| Money Sage Services Ltd | Professional & scientific | 2017 |
| Moreno Osteopathy Ltd | Health & social care | 2018 |
| MR J Goodfellow Ltd | Health & social care | 2018 |
| Mygymdoctor Ltd | Health & social care | 2026 |
| N C Medical Ltd | Health & social care | 2016 |
| N Co Private Clients Ltd | Professional & scientific | 2021 |
| Nafbc Medical Limited | Health & social care | 2022 |
| NDB Anaesthetic Services Ltd | Health & social care | 2025 |
| Newlands Motor Company Ltd | Wholesale & retail | 2015 |
| Nicholas Joseph Mewse Electrical Ltd | Construction | 2015 |
| Nichols & Co (Accounting) LLP | | 2018 |
| Nichols & Co (CM) Ltd | Professional & scientific | 2013 |
| Nicholson Anaesthesia Ltd | Health & social care | 2019 |
| Niral Ltd | Real estate | 2015 |
| Ocean Swell Consulting Ltd | Professional & scientific | 2022 |
| Onaal Limited | Wholesale & retail | 2025 |
| Oncology Vision Ltd | Health & social care | 2022 |
| Opel Baker Ltd | Health & social care | 2013 |
| Ormond Medical Ltd | Health & social care | 2012 |
| Orthonova Limited | Health & social care | 2010 |
| Oxford Head & Neck Surgery Limited | Health & social care | 2015 |
| Ozimzim Catering Ltd | Hospitality | 2020 |
| Pacific Support Services Ltd | Administrative & support | 2015 |
| Paperback Riders Ltd | Extraterritorial | 2013 |
| Parkham Properties Limited | Real estate | 1958 |
| PD Molyneux Neurology Consultancy Ltd | Health & social care | 2019 |
| PDM Psychiatry Ltd | Health & social care | 2015 |
| Physiobrite Limited | Health & social care | 2019 |
| PJW Solutions Limited | Information & communication | 2010 |
| Premium Online Limited | Wholesale & retail | 2023 |
| Pro EYE Care Ltd | Health & social care | 2025 |
| Psychonaesia Limited | Health & social care | 2019 |
| PWS Consulting Ltd | Information & communication | 2022 |