| Jewn (UK) Limited | Wholesale & retail | 2002 |
| Jkla Media Limited | Professional & scientific | 2012 |
| JL Property Corporation Limited | Real estate | 2020 |
| JLP A&A Class Representative Limited | Professional & scientific | 2023 |
| JLP TCR Ltd | Professional & scientific | 2026 |
| Jmbt Properties Ltd | Construction | 2022 |
| JMC Larkswood Limited | Real estate | 2024 |
| JMC Norwich Limited | Real estate | 2024 |
| JMD Harvey Properties Limited | Real estate | 2023 |
| Joes Garage London Limited | Wholesale & retail | 2007 |
| John Maurice Bishop Limited | Professional & scientific | 2016 |
| JPB Management Contractors Limited | Professional & scientific | 2016 |
| JPB Property Management Limited | Real estate | 2022 |
| JRH Roofing Limited | Construction | 2010 |
| JRH Solar Limited | Construction | 2022 |
| Justviz Limited | Information & communication | 2008 |
| JWR Tech Ltd | Manufacturing | 2019 |
| K.E.Gue Limited | Professional & scientific | 1970 |
| Kaiju Creative Limited | Information & communication | 2022 |
| Katila Management Limited | Professional & scientific | 2008 |
| KAW Property Ltd. | Construction | 2016 |
| Kcso Stone Limited | Construction | 2018 |
| Keech Green Limited | Administrative & support | 2006 |
| Kennedy Dundas Limited | Administrative & support | 2012 |
| Ketchup TV Limited | Extraterritorial | 2013 |
| KEW Cottages Management Limited | Households | 2009 |
| Kidlex Limited | Wholesale & retail | 1982 |
| Kindred Wellbeing Ltd | Other services | 2016 |
| Kinetic Helm Limited | Professional & scientific | 2008 |
| King Performance Ltd | Arts & recreation | 2020 |
| Kingfisher Cottage LLP | | 2008 |
| Kirk Building and Groundwork’S Ltd | Construction | 2025 |
| Kiukas Consulting Limited | Professional & scientific | 2022 |
| KLC Renovations Ltd | Construction | 2024 |
| Knapps Securities Limited | Real estate | 1962 |
| Knight Automotive Ltd | Wholesale & retail | 2021 |
| Knight Mitchell Limited | Construction | 2018 |
| KPF Mechanical Services Ltd | Construction | 2022 |
| Kraftbox Ltd | Information & communication | 2022 |
| Krigland Limited | Real estate | 2015 |
| Krish Retail Private Limited | Wholesale & retail | 2021 |
| Ktda Consultancy Limited | Professional & scientific | 2015 |
| L Raiman Ltd | Health & social care | 2024 |
| Lalaa Limited | Financial services | 2012 |
| Landbuild EOT Limited | Construction | 2026 |
| Landbuild Limited | Construction | 2001 |
| Landbuild Property Ltd | Real estate | 2015 |
| Landmark Contractors Southern Limited | Construction | 2019 |
| Langley Foods Ltd | Manufacturing | 2012 |
| Langridge Court Farm Limited | Administrative & support | 2000 |
| Larner Medical Procedures Limited | Health & social care | 2014 |
| LAT Engineering Limited | Manufacturing | 2016 |
| Launch Aerospace Ltd | Transport & logistics | 2011 |
| Layla Resources Limited | Administrative & support | 1988 |
| LE BAS Properties Limited | Real estate | 2003 |
| LE Patourel Consulting Limited | Professional & scientific | 2016 |
| Lemon IT Services Ltd | Information & communication | 2000 |
| LEO CUB International Limited | Wholesale & retail | 1962 |
| LH Freedom Limited | Real estate | 2024 |
| Lifeuni CIC | Information & communication | 2021 |
| Lily Lifts Limited | Arts & recreation | 2025 |
| Lincombe Publishing Limited | Administrative & support | 2001 |
| Lincombe Services Limited | Administrative & support | 2008 |
| Lisa Mudie Limited | Professional & scientific | 2022 |
| Liscr (UK) Limited | Extraterritorial | 1999 |
| Little Book Factory Ltd | Information & communication | 2025 |
| Live Investments Limited | Construction | 1999 |
| Livebytes Ltd | Arts & recreation | 2026 |
| Lovaco Ltd | Information & communication | 2024 |
| Loxwood Burners Ltd | Wholesale & retail | 2014 |
| Lucy's FUN Music Time Ltd | Education | 2024 |
| Lujarogames Ltd | Wholesale & retail | 2022 |
| M and T Dental Limited | Health & social care | 2015 |
| M B S Survey Software Limited | Information & communication | 1997 |
| M Dunkley Services Limited | Wholesale & retail | 2020 |
| M J Property Hub Ltd | Real estate | 2025 |
| MAC Pro Construction Ltd | Construction | 2018 |
| Mach One Design Equipment Limited | Information & communication | 1996 |
| Maharaja Limited | Hospitality | 2003 |
| Maid in Steyning Ltd | Administrative & support | 2021 |
| Manborne Custom Furniture Limited | Manufacturing | 2006 |
| Mansell Mctaggart Steyning Limited | Real estate | 2024 |
| Mark Edmondson Healthcare Limited | Health & social care | 2016 |
| Marshall Advisory Ltd. | Professional & scientific | 2017 |
| Martin Owen Construction Ltd | Construction | 2025 |
| Martin Owen Group Limited | Construction | 2025 |
| Martin Pooley Associates Limited | Administrative & support | 2006 |
| Mast Ventures Ltd | Arts & recreation | 2025 |
| Mat&Steve Aluminium Buildings Ltd | Construction | 2026 |
| Mat&Steve Coversystems Ltd | Construction | 2026 |
| Mat&Steve Driveways & Patios Ltd | Construction | 2026 |
| Mat&Steve Linings Ltd | Construction | 2026 |
| Mat&Steve Polycarbon Building Service & Repairs Ltd | Construction | 2025 |
| Mat&Steve Windows and Doors Ltd | Construction | 2025 |
| Matrix Security Services Limited | Administrative & support | 2002 |
| Matterhorn Properties Limited | Real estate | 2007 |
| Mayoss & Co. Builders Limited | Construction | 2010 |
| MB Autocheck Limited | Other services | 1977 |
| MB Motors Sussex Ltd | Wholesale & retail | 2021 |
| MBR Conroy Limited | Real estate | 2025 |