| JMD Accounting Ltd | Professional & scientific | 2003 |
| JME Investments Limited | Real estate | 2003 |
| Jmesh Limited | Information & communication | 2003 |
| JMJ Builders Ltd | Construction | 2016 |
| JNS Trading Limited | Wholesale & retail | 2023 |
| Joanda Services Limited | Hospitality | 1986 |
| John Artis Limited | Manufacturing | 1975 |
| John Burnham (Components) Limited | Professional & scientific | 1990 |
| John Knight Limited | Professional & scientific | 1989 |
| John Oakes Consultancy Limited | Information & communication | 2002 |
| John Oxtaby Limited | Information & communication | 2005 |
| Johnny Douglas Enterprises Limited | Information & communication | 1956 |
| Johnson WAX Limited | Administrative & support | 1921 |
| Johnson WAX Pension Trustee Company Limited | Professional & scientific | 1982 |
| Johnston Sweepers Limited | Manufacturing | 1980 |
| Join Lucy Limited | Energy | 2021 |
| Jojo Phones Ltd | Wholesale & retail | 2024 |
| Jojo's Property Services Limited | Construction | 2013 |
| Jolly and Barber Limited | Manufacturing | 1923 |
| Jomini Highlight PLC | | 1989 |
| Jonaletor Limited | Professional & scientific | 2006 |
| Jonman Contracts Limited | Administrative & support | 1970 |
| Jonmans Limited | Manufacturing | 2000 |
| Jordan River Consulting Ltd | Information & communication | 2023 |
| Jordanlu Ltd | Transport & logistics | 2017 |
| Joseph Bentley (Hairdressers) Limited | Arts & recreation | 1978 |
| Joseph Roth and Company Limited | | 1950 |
| Josephs (2002) Ltd | Other services | 2002 |
| Journeyman Pictures Limited | Information & communication | 1990 |
| Jovan Foods Limited | Manufacturing | 2003 |
| Jpnd (UK) Limited | Professional & scientific | 1999 |
| JPW Accountants Ltd | Professional & scientific | 2001 |
| JPY Limited | Information & communication | 1991 |
| JR Filling Station Ltd | Wholesale & retail | 2023 |
| JRM ENG Design Ltd. | Professional & scientific | 1991 |
| JRV Electrical Ltd | Construction | 2013 |
| JS Services Limited | Real estate | 2004 |
| Jsab Limited | Professional & scientific | 2008 |
| JSB Associates Limited | Professional & scientific | 1995 |
| JSK Stores Limited | Wholesale & retail | 2024 |
| JSS (Dorking) LLP | | 2005 |
| JSS Property Partners Ltd | Real estate | 2023 |
| JT Windows Ltd | Construction | 2025 |
| JTC Consultancy LLP | | 2017 |
| Jubilee Installations Limited | Construction | 2002 |
| Jules Pharma Limited | Wholesale & retail | 2002 |
| Julia Biggs Consultancy Limited | Professional & scientific | 2006 |
| Julia Frimond With Elizabeth Muirhead | | 1996 |
| Jumpin' Juice Limited | Manufacturing | 2003 |
| Juna Business Advisory Limited | Health & social care | 2005 |
| Juniper Gardens (Chessington) Limited | Real estate | 1994 |
| Juno Partners Limited | Professional & scientific | 2004 |
| Jupiter Associates Limited | Manufacturing | 1971 |
| Jupiter Sales Company Limited | Wholesale & retail | 1990 |
| Just Channels Ltd | Information & communication | 2006 |
| Just Organics Ltd | Hospitality | 2015 |
| Justice Marketing Limited | Professional & scientific | 1993 |
| Juvante Consult Limited | Information & communication | 2013 |
| Jwgk Investments Ltd | Real estate | 2022 |
| Jwps Trustees Limited | Professional & scientific | 2006 |
| K & F Property Limited | Real estate | 2017 |
| K & S Mezra Limited | Hospitality | 2004 |
| K a Services Surrey Limited | Wholesale & retail | 2003 |
| K C S (Surrey) Ltd | Transport & logistics | 2005 |
| K C S Lifting & Transportation Limited | Construction | 2006 |
| K H Associates (UK) Ltd | Information & communication | 2007 |
| K O Headley Limited | Health & social care | 2015 |
| K R Services Limited | Construction | 2007 |
| K V Accountants Limited | Professional & scientific | 2002 |
| K-Tech Consulting Limited | Information & communication | 2002 |
| K. B. C. Associates Limited | Administrative & support | 2005 |
| K. Mckeeman Limited | Health & social care | 2003 |
| K.A.L.M. RTM Company Limited | Households | 2004 |
| K.C. Investment Limited | Real estate | 1998 |
| K.D. Masonry Limited | Other services | 2002 |
| K.H. Controls Limited | Professional & scientific | 2002 |
| KAI Estates Ltd | Financial services | 2018 |
| KAI Property Solutions Ltd | Real estate | 2019 |
| KAI Serviced Apartments Ltd | Real estate | 2018 |
| Kaipwik Ltd | Information & communication | 2020 |
| Kairos Consultancy Limited | Professional & scientific | 2005 |
| KAL - TAN Limited | Health & social care | 1988 |
| Kaleys Haircutters Limited | Other services | 2002 |
| Kalidas Jewellers Ltd | Wholesale & retail | 1993 |
| KAM Consultancy Ltd | Professional & scientific | 2003 |
| Kamerakaze Films Limited | Information & communication | 2003 |
| Kamiki Drinks LLP | | 2017 |
| Kane FM Limited | Information & communication | 2006 |
| Kanecreek Limited | Hospitality | 2006 |
| Kaneesgar Ltd | Real estate | 2021 |
| Kanley Investments Ltd | Hospitality | 2004 |
| Kanthavanam Trust | Other services | 2020 |
| Kappa Delta Limited | Professional & scientific | 2001 |
| Kardos Creative Limited | Professional & scientific | 2005 |
| Karen Oliver Design Ltd | Administrative & support | 2017 |
| Karia London Ltd | Real estate | 2017 |
| Karim's Bakery Limited | Hospitality | 2003 |
| Kass Holdings Ltd | Real estate | 2020 |
| Kasseri Ltd | Other services | 2023 |
| Katbp Trad Ltd | Wholesale & retail | 2019 |