| JW Management Consulting Ltd | Professional & scientific | 2025 |
| JWL (GB) Limited | Households | 2000 |
| JWN Carpentry Ltd | Manufacturing | 2019 |
| JWS Property Consultancy Limited | Professional & scientific | 2018 |
| JZ Insights Ltd | Professional & scientific | 2024 |
| K & E Management Limited | Real estate | 2022 |
| K & L Property Solutions Limited | Real estate | 2018 |
| K & P Heating Limited | Construction | 2011 |
| K & T Entertainment Ltd | Wholesale & retail | 2025 |
| K and M Creations Limited | Wholesale & retail | 2003 |
| K Bibi Real Estate Limited | Real estate | 2024 |
| K Fergusons Holding Company Ltd | Financial services | 2023 |
| K G Landscapes Ltd | Administrative & support | 2022 |
| K Gibbs Construction Limited | Construction | 2013 |
| K International Freight Service Ltd | Transport & logistics | 2025 |
| K J Tonner Building Services Ltd | Construction | 2007 |
| K Jacklin Carpentry Limited | Other services | 2017 |
| K Jacklin Construction Limited | Construction | 2023 |
| K Jacklin Properties Limited | Real estate | 2021 |
| K K Medical Consultant Ltd | Health & social care | 2010 |
| K P Cafferkey Limited | Construction | 2014 |
| K W Equine Ltd | Agriculture & fishing | 2024 |
| K&D Commerce Ltd | Wholesale & retail | 2016 |
| K&D Design Ltd | Manufacturing | 2025 |
| K&R Property Lets Ltd | Real estate | 2021 |
| K-Electrical and Renewable Energy Solutions Ltd | Construction | 2014 |
| K-Kon Home Improvements Ltd | Construction | 2024 |
| K-Rad Ltd | Health & social care | 2020 |
| K. K. Composites Ltd | Manufacturing | 2017 |
| K.C.1982 Composite Ltd | Manufacturing | 2026 |
| K.G.Matzen Ltd | Manufacturing | 2020 |
| K.H.I. Consultation Ltd | Administrative & support | 2025 |
| K.J. Hunt Limited | Construction | 1997 |
| K.M. Turner Heating & Plumbing Limited | Construction | 2004 |
| K.Star Logistics Ltd | Transport & logistics | 2022 |
| K1 Accommodation Limited | Hospitality | 2019 |
| K1 Cambridge Barber Ltd | Other services | 2025 |
| K3K Networks Ltd | Information & communication | 2010 |
| K3K Properties Ltd | Real estate | 2021 |
| K8 Tech Ltd | Manufacturing | 2026 |
| K9 Behaviour Solutions Limited | Administrative & support | 2023 |
| KA Property Venture Ltd | Real estate | 2025 |
| Kaaf Services Ltd | Administrative & support | 2025 |
| Kaalu Limited | Real estate | 2023 |
| Kabala Properties Ltd | Real estate | 2021 |
| Kabsec Consultancy Ltd | Administrative & support | 2021 |
| Kacito Co., Limited | Wholesale & retail | 2024 |
| Kadance Ltd | Hospitality | 2021 |
| Kadir Fish & Chips Limited | Hospitality | 2020 |
| Kadu Import and Export Co., Ltd | Manufacturing | 2020 |
| Kaelis Limited | Health & social care | 2017 |
| Kahboom Ltd | Information & communication | 2015 |
| Kaida Holding Limited | Extraterritorial | 2010 |
| Kaida House Management Company Limited | Households | 1973 |
| Kaifan Group Co., Ltd | Transport & logistics | 2025 |
| Kailai Pharmaceutical Co., Limited | Wholesale & retail | 2025 |
| Kainat International Trading Co., Ltd | Wholesale & retail | 2025 |
| Kairos Bridge Technology Co., Ltd | Extraterritorial | 2025 |
| Kairos Property Management Ltd | Real estate | 2025 |
| Kaiser Driving School Limited | Education | 2023 |
| Kaiz IT Services Ltd | Information & communication | 2019 |
| Kaizen Consulting and Training Ltd | Professional & scientific | 2019 |
| Kaizen Consulting Services Limited | Information & communication | 2020 |
| Kajtek Ltd | Wholesale & retail | 2020 |
| Kakubiti Industrial Automation Technology Limited | Manufacturing | 2023 |
| Kalabhairava Ltd | Real estate | 2025 |
| Kaladena Social Venture Capital Limited | Administrative & support | 2008 |
| Kalamna C.I.C. | Education | 2018 |
| Kalamna Global Limited | Education | 2024 |
| Kaleidoscope (Cambridge) Management Company Limited | Households | 2008 |
| Kaleidoscope Coaching & Mediation Ltd | Education | 2024 |
| Kalima Studio Ltd | Professional & scientific | 2023 |
| Kalina Research Ltd | Professional & scientific | 2023 |
| Kalium Health Ltd | Professional & scientific | 2018 |
| Kallinika Aynsley Ltd | Other services | 2020 |
| KAM Estates INT Ltd | Real estate | 2022 |
| KAM Retail Ltd | Wholesale & retail | 2014 |
| KAM Scaffolding Ltd | Construction | 2006 |
| Kamafikri Limited | Real estate | 2025 |
| Kamaly Consultancy Limited | Professional & scientific | 2016 |
| Kamaly Ltd | Professional & scientific | 2021 |
| Kambridge Consulting Limited | Information & communication | 2024 |
| Kamila Bailey Talent Consulting Limited | Professional & scientific | 2023 |
| Kamry Trade (UK) Co., Ltd | Wholesale & retail | 2025 |
| Kanaily Ltd | Hospitality | 2019 |
| Kandiah Logistics Ltd | Transport & logistics | 2024 |
| Kane's Hiab & Transport Ltd | Transport & logistics | 2025 |
| Kang Bridge Development Limited | Construction | 2016 |
| Kang Chiao Ltd | Manufacturing | 2019 |
| Kang Qiao Property Development Limited | Real estate | 2016 |
| Kangjia Import and Export Limited | Extraterritorial | 2024 |
| Kanit Limited | Education | 2021 |
| Kansultancy Ltd | Information & communication | 2021 |
| Kanuna Limited | Information & communication | 2024 |
| Kaoxudianzishangmao Limited | Wholesale & retail | 2025 |
| Kaplan Trading Ltd | Manufacturing | 2016 |
| Karabag Hill Ltd | Professional & scientific | 2007 |
| Karaca Computer Ltd | Wholesale & retail | 2021 |
| Karamazov Ltd | Information & communication | 2025 |
| Karbil Ltd | Real estate | 2025 |