| Jvckenwood U.K. Limited | Wholesale & retail | 1998 |
| JVM Group Ltd | Real estate | 2021 |
| JVT Consulting Ltd | Professional & scientific | 2019 |
| JVT Ltd | Professional & scientific | 2015 |
| JW Developments Group Limited | Financial services | 2021 |
| JW Test Consulting Ltd | Professional & scientific | 2016 |
| Jwjm Prop Ltd | Construction | 2026 |
| Jwmf Properties Limited | Real estate | 2020 |
| Jwtravelexec Ltd | Administrative & support | 2017 |
| JWX Signalling Ltd | Professional & scientific | 2022 |
| JY Developments Ltd | Hospitality | 2022 |
| Jzstocks Ltd | Wholesale & retail | 2025 |
| Jūgaad Drinks Ltd | Manufacturing | 2025 |
| K & K Enterprises Ltd | Real estate | 1976 |
| K & L Holdings Limited | Financial services | 2015 |
| K & N Developments Ltd | Construction | 2019 |
| K & S Signs Limited | Administrative & support | 2005 |
| K Ateilar Limited | Wholesale & retail | 2023 |
| K B a Direct Limited | Wholesale & retail | 1998 |
| K B a Residential Limited | Wholesale & retail | 2000 |
| K Beauty Wholesale Limited | Wholesale & retail | 2026 |
| K Building Freehold Limited | Real estate | 2015 |
| K Building Management Company Limited | Real estate | 2002 |
| K Care Management Limited | Professional & scientific | 2024 |
| K Consultancy Services Ltd | Professional & scientific | 2024 |
| K Dwellings Ltd | Real estate | 2025 |
| K Gill & SON Ltd | Construction | 2016 |
| K Parts UK Ltd | Wholesale & retail | 2019 |
| K Sasi Limited | Wholesale & retail | 2026 |
| K Smith Civils Ltd | Construction | 2016 |
| K T Whelan Ltd | Real estate | 2022 |
| K Towgood Limited | Health & social care | 2018 |
| K Wadsworth Estates Limited | Real estate | 2026 |
| K&B Corporate Consulting Ltd | Professional & scientific | 2026 |
| K&Bs Beauty Salon Limited | Other services | 2024 |
| K&F MOT Limited | Real estate | 2024 |
| K&P Accountants Ltd | Professional & scientific | 2026 |
| K&P Apparel Ltd | Wholesale & retail | 2019 |
| K&S Properties Estates Limited | Real estate | 2022 |
| K&S Services International Ltd | Information & communication | 2020 |
| K&T Partners Ltd | Real estate | 2025 |
| K-Technoworld Security Services Ltd | Construction | 2023 |
| K-Visuals Ltd | Wholesale & retail | 2022 |
| K.A Housing Solutions Ltd | Real estate | 2024 |
| K.I.M VIP Ltd | Transport & logistics | 2018 |
| K11 Properties Ltd | Real estate | 2024 |
| K2 Consulting Limited | Information & communication | 1993 |
| K2 Drives and Controls Group Limited | Financial services | 2026 |
| K2 Drives and Controls Limited | Manufacturing | 2003 |
| K2B Contracting Ltd | Professional & scientific | 2018 |
| K3S Group Ltd | Real estate | 2017 |
| K4S Estates Ltd | Real estate | 2023 |
| K4S Groups Limited | Information & communication | 2024 |
| K4S IT Solutions Limited | Information & communication | 2024 |
| K9 Security Services Limited | Administrative & support | 2024 |
| KA Digital Ltd | Information & communication | 2019 |
| Kaamyaab Enterprises Ltd | Hospitality | 2023 |
| Kaarunya Limited | Information & communication | 2011 |
| Kaash Investments Limited | Arts & recreation | 2017 |
| Kaddie Limited | Wholesale & retail | 2017 |
| Kadib Consulting Ltd | Information & communication | 2019 |
| Kadria's Carwash & Valeting Ltd | Other services | 2012 |
| Kadria's Property Ltd | Real estate | 2018 |
| Kaffra Hackney Ltd | Hospitality | 2025 |
| Kahan Guru Ltd | Wholesale & retail | 2018 |
| KAI Suri Racing Limited | Wholesale & retail | 2026 |
| Kaidin Management Limited | Professional & scientific | 2020 |
| Kairo Partners Ltd | Professional & scientific | 2026 |
| Kairos Properties Limited | Real estate | 2016 |
| Kaito Design Ltd | Professional & scientific | 2025 |
| Kaito Property Investment Limited | Real estate | 2021 |
| Kaizai Consulting Ltd | Information & communication | 2018 |
| Kaizen Henko Ltd | Professional & scientific | 2017 |
| Kaizentech Solutions Ltd | Information & communication | 2017 |
| Kaizo Ltd | Information & communication | 2026 |
| Kakadu Ltd | Wholesale & retail | 2021 |
| Kake-Haus Ltd | Wholesale & retail | 2010 |
| Kalahroudi Ltd | Information & communication | 2026 |
| Kaliteros Consultancy Limited | Information & communication | 2007 |
| Kalos Intercontinental Concept Limited | Construction | 2021 |
| KALPA8 Limited | Professional & scientific | 2018 |
| Kalpit Ltd | Information & communication | 2015 |
| Kalra Property Ltd | Real estate | 2022 |
| Kalsi Limited | Administrative & support | 2013 |
| Kalyan International Ltd | Hospitality | 2025 |
| KAM Groundworks Ltd | Construction | 2023 |
| KAM Sira Ltd | Professional & scientific | 2012 |
| Kama Legal Limited | Professional & scientific | 2025 |
| Kamalexx LLP | | 2023 |
| Kamca Ltd | Hospitality | 2025 |
| Kamo Trading UK Ltd | Real estate | 2022 |
| Kamri Ltd | Mining & quarrying | 2018 |
| Kams London Ltd | Construction | 2023 |
| Kamsam Limited | Real estate | 2005 |
| Kamu Streetfood Ltd | Hospitality | 2021 |
| Kamvi Consulting Limited | Professional & scientific | 2024 |
| Kanak Ltd | Hospitality | 2011 |
| Kanans Investment Ltd | Real estate | 2020 |
| Kanbir Solutions Ltd | Professional & scientific | 2019 |
| Kandahar Restaurant Ltd | Hospitality | 2025 |