| Kiran Singh Design Limited | Professional & scientific | 2015 |
| KKJ Properties Limited | Real estate | 2017 |
| Konfekt Limited | Other services | 2016 |
| KZT Technology Limited | Information & communication | 2023 |
| Lacrycouture Limited | Professional & scientific | 2023 |
| Lavendo Developments Limited | Construction | 2019 |
| Lavendo Holdings Limited | Financial services | 2017 |
| Lavendo Investments Limited | Administrative & support | 2016 |
| Left Hand Drive Ltd | Wholesale & retail | 2010 |
| Levelset Limited | Information & communication | 2017 |
| Lexpharmreg Limited | Manufacturing | 2025 |
| Lijaro Services Limited | Financial services | 2011 |
| Lines R US Limited | Construction | 2020 |
| Links Social UK Ltd | Information & communication | 2025 |
| Linksource Ltd. | Information & communication | 2010 |
| Lionwalk Limited | Real estate | 1984 |
| Location Builders Limited | Real estate | 1998 |
| Lockstar Holdings Ltd | Real estate | 2025 |
| Lockstar Limited | Construction | 2002 |
| Logically Applied Solutions Limited | Manufacturing | 2001 |
| LP Creative & Operations Ltd | Professional & scientific | 2025 |
| LP3DFX Limited | Information & communication | 2018 |
| Lpfm Limited | Professional & scientific | 2018 |
| Luxuria Holdings Ltd | Financial services | 2019 |
| Luxuria Property Ltd | Construction | 2015 |
| M4 Software Limited | Information & communication | 1990 |
| Maidstone Investment Holdings Ltd | Real estate | 2025 |
| Mama Property Solutions Ltd | Real estate | 2015 |
| Mand Transport Ltd | Transport & logistics | 2024 |
| Mandorla Solutions Limited | Professional & scientific | 2025 |
| Mann 2020 Limited | Construction | 1986 |
| Manorfind Limited | Hospitality | 1991 |
| Marais Holdings Limited | Professional & scientific | 2017 |
| MB Coroghon Limited | Real estate | 2017 |
| Mbryo Invest Ltd | Professional & scientific | 2023 |
| MD Cosmedico Limited | Other services | 2011 |
| Medireg Services UK Limited | Public administration | 2024 |
| Medway Lettings Ltd | Administrative & support | 2006 |
| Meeples Ltd | Information & communication | 2007 |
| Mercantia Limited | Wholesale & retail | 2026 |
| Meribel Racing Ltd | Arts & recreation | 2024 |
| Merx Concierge Services Limited | Administrative & support | 2013 |
| Metiisto Design Limited | Construction | 2020 |
| Mike Bakes Limited | Hospitality | 2026 |
| Milbourne Construction Limited | Construction | 2010 |
| Mill Creek Limited | Construction | 2018 |
| Mimir Cable Ltd | Information & communication | 2025 |
| Mistelis & Haddadin Ltd | Professional & scientific | 2013 |
| Miyabi Consultants Limited | Professional & scientific | 2003 |
| Mmll Apartments Limited | Real estate | 2018 |
| Mmll Properties Limited | Real estate | 2018 |
| Moore Projects Development Limited | Real estate | 2003 |
| Mount Business Services Limited | Professional & scientific | 2015 |
| Mova Hair & Beauty (Virginia Water) Ltd | Other services | 2010 |
| Mt&R Capital Limited | Financial services | 2020 |
| Muoverti Limited | Manufacturing | 2014 |
| My Baby Store London Limited | Wholesale & retail | 2019 |
| NA Belle Aesthetics Ltd | Other services | 2021 |
| Naly Mahmod Ltd | Other services | 2026 |
| Nardo Consulting LLP | | 2024 |
| Nataliakremenballetschool Ltd | Other services | 2012 |
| Neoteric Designs Ltd | Wholesale & retail | 2020 |
| Nidify Limited | Real estate | 2023 |
| Nishtha Property Solutions Ltd | Real estate | 2014 |
| NMT 88 Consulting Ltd | Professional & scientific | 2026 |
| NO Fuss Products Ltd | Manufacturing | 2021 |
| Norsand Consultancy Limited | Administrative & support | 2017 |
| North India Estates Limited | Real estate | 2007 |
| North Park Homes (Sussex) Limited | Hospitality | 2016 |
| Novetic Ltd | Wholesale & retail | 2013 |
| NST Consultants Ltd | Administrative & support | 2020 |
| O.T.M. (Holdings) Limited | Professional & scientific | 1987 |
| O.T.M. Estates Limited | Real estate | 2008 |
| Oakwood House Freehold Limited | Financial services | 2022 |
| Official World Golf Ranking | Arts & recreation | 2003 |
| Omegon UK Limited | Information & communication | 2001 |
| Optiks Ltd | Wholesale & retail | 2005 |
| Origin TC Consulting Ltd | Professional & scientific | 2026 |
| Osaat Investments Limited | Information & communication | 2019 |
| Otomata Ltd | Information & communication | 2019 |
| Outside Spaces Limited | Administrative & support | 2015 |
| Outsource US Ltd | Information & communication | 2025 |
| P.M.S Motors Ltd | Wholesale & retail | 2017 |
| Partners T&T Ltd | Other services | 2016 |
| Pasitrans Ltd | Transport & logistics | 2020 |
| PB Digital Holdings Ltd | Professional & scientific | 2025 |
| Penny Car Hire Limited | Administrative & support | 1997 |
| Pensieve AI Ltd | Information & communication | 2025 |
| Pergot Limited | Public administration | 2024 |
| PGA European Tour | Arts & recreation | 1984 |
| PGA European Tour Productions Limited | Information & communication | 1991 |
| Pinelthorne Limited | Information & communication | 2026 |
| PK Medicare Limited | Health & social care | 2014 |
| Plahi Property Dealers 34 Limited | Real estate | 2006 |
| Plahi Property Investments Limited | Real estate | 1971 |
| Plectrum Limited | Professional & scientific | 2024 |
| Pole Position Direct Ltd | Transport & logistics | 2013 |
| Portico Design and Developments Limited | Construction | 2012 |
| Prosdocimi Limited | Financial services | 2007 |
| PSA Partners LLP | | 2012 |