| Jwala Chilli Limited | Hospitality | 2019 |
| Jwpr Ltd | Real estate | 2021 |
| JYM Recruitment Ltd | Administrative & support | 2020 |
| Jzori Consultant Ltd | Professional & scientific | 2015 |
| K & B Collections Service Limited | Administrative & support | 2012 |
| K & B Recycling Limited | Water & waste | 2020 |
| K & G Consultancy Ltd | Information & communication | 2015 |
| K & J Ductwork Limited | Construction | 2018 |
| K & K Services Limited | Transport & logistics | 2003 |
| K & M Rashid Limited | Wholesale & retail | 1991 |
| K & N Ventures Limited | Health & social care | 2021 |
| K & P Ward Ltd | Agriculture & fishing | 2011 |
| K & W Residential Sales Limited | Real estate | 2008 |
| K and K Health Ltd | Health & social care | 2023 |
| K and S General Construction Ltd | Administrative & support | 2010 |
| K B Concerts Limited | Arts & recreation | 2024 |
| K Bangs Consultancy Ltd | Professional & scientific | 2023 |
| K C Engineering Solutions Ltd | Other services | 2014 |
| K J Style Boutique Limited | Wholesale & retail | 2014 |
| K Korporation Limited | Wholesale & retail | 2025 |
| K L P Events Limited | Professional & scientific | 2019 |
| K Mullen Services Ltd. | Professional & scientific | 2017 |
| K N P Marketing Limited | Professional & scientific | 2014 |
| K Nails and Beauty Ltd | Other services | 2023 |
| K Urbanczyk Limited | Construction | 2010 |
| K V Naik Limited | Health & social care | 2025 |
| K&B Consultancy Limited | Administrative & support | 2017 |
| K&B Used Car Motors Ltd | Wholesale & retail | 2025 |
| K&F Coffee 2 Ltd | Hospitality | 2022 |
| K&F Coffee Ltd | Hospitality | 2021 |
| K&K Klean Limited | Other services | 2019 |
| K&K Property Investments (Bedfordshire) Ltd | Real estate | 2019 |
| K&L Enterprise Ltd | Real estate | 2025 |
| K&M Self Storage Limited | Transport & logistics | 2019 |
| K&R Garage Ltd | Wholesale & retail | 2024 |
| K&S SAI Properties Ltd | Real estate | 2025 |
| K&S Tech Ltd | Information & communication | 2018 |
| K-Classiq Global Ltd | Wholesale & retail | 2025 |
| K-James Consultancy and Headship Ltd | Education | 2021 |
| K. Aninfeng Ltd | Health & social care | 2018 |
| K.A.A.P Siblings Ltd | Real estate | 2024 |
| K.Carter Cars Limited | Wholesale & retail | 2022 |
| K.D.J Aircraft Maintenance Limited | Transport & logistics | 2009 |
| K.O.Airsoft Limited | Wholesale & retail | 2017 |
| K.S Decorating Limited | Construction | 2015 |
| K2 Geminids Education Ltd | Education | 2019 |
| K28 Properties Limited | Real estate | 2021 |
| K2B Alpha Limited | Professional & scientific | 2015 |
| K31H Ltd | Public administration | 2023 |
| K3HAULAGE Ltd | Transport & logistics | 2026 |
| K9 Dental Ltd | Health & social care | 2020 |
| K9 Security Support Services Ltd | Administrative & support | 2020 |
| K9 Standard Ltd | Wholesale & retail | 2024 |
| KA & AF Holdings Limited | Real estate | 2023 |
| KA Sentinel Force Ltd | Administrative & support | 2024 |
| Kaak Group United Kingdom Limited | Manufacturing | 1986 |
| Kaamakya Consulting Limited | Information & communication | 2026 |
| Kaas Group Limited | Real estate | 2023 |
| Kaavee Housing Limited | Real estate | 2021 |
| Kaavee Ltd | Health & social care | 2019 |
| Kaavee Staffing Ltd | Health & social care | 2026 |
| Kaba Logistic Ltd | Transport & logistics | 2019 |
| Kabaal Properties Ltd | Real estate | 2024 |
| Kabayan Finance Limited | Financial services | 2009 |
| Kabbana UK Ltd | Manufacturing | 2026 |
| Kabell Etal Limited | Professional & scientific | 2026 |
| Kacmur Limited | Real estate | 2020 |
| Kadali Desserts Ltd | Hospitality | 2021 |
| Kadiff Properties Limited | Real estate | 2024 |
| Kads Estate Ltd | Information & communication | 2016 |
| Kaema Ltd | Hospitality | 2025 |
| Kaeva Coffee Ltd | Wholesale & retail | 2026 |
| Kafig UK Ltd | Other services | 2015 |
| Kafilasisters Ltd | Administrative & support | 2025 |
| KAI Precision Painting Ltd | Construction | 2026 |
| Kaice Properties Ltd | Real estate | 2026 |
| Kaido Rental Limited | Administrative & support | 2026 |
| Kairos Distribution (UK) Limited | Real estate | 2021 |
| Kaizen Business Consulting Ltd | Information & communication | 2006 |
| Kaizen Consulting and Engineering Ltd | Professional & scientific | 2018 |
| Kaizen Infotech UK Limited | Extraterritorial | 2016 |
| Kaizen Medical Technology Limited | Information & communication | 2019 |
| Kaizen Restaurants Ltd | Hospitality | 2011 |
| KAK Estate Agents Ltd | Real estate | 2025 |
| KAL Beyond Ltd | Administrative & support | 2025 |
| Kalabhairava Constructions Limited | Construction | 2026 |
| Kalasanskruti UK CIC | Education | 2025 |
| Kalculator Limited | Professional & scientific | 2021 |
| Kalg Limited | Real estate | 2023 |
| Kallman Communication Limited | Information & communication | 2023 |
| Kalpataru by Shapna Limited | Wholesale & retail | 2025 |
| Kals Kleans Ltd | Administrative & support | 2024 |
| Kamanda & Cinders Ltd | Real estate | 2024 |
| Kambiro TM Ltd | Construction | 2024 |
| Kamcordings Ltd | Information & communication | 2025 |
| Kamil Business Solutions Limited | Administrative & support | 2013 |
| Kamilionaire's Club Ltd | Administrative & support | 2017 |
| Kamms IT Limited | Information & communication | 2003 |
| Kamus Property Maintenance Ltd | Construction | 2026 |
| Kamzia Limited | Professional & scientific | 2015 |