| Kiwansbcare Ltd | Health & social care | 2026 |
| Kiwi Children's Services Ltd | Health & social care | 2020 |
| Kizmario Ltd | Wholesale & retail | 2024 |
| Kizuna Japanese Sake Limited | Wholesale & retail | 2021 |
| Kizuri Investments Ltd | Real estate | 2020 |
| KJ Consulting Solutions Ltd | Professional & scientific | 2015 |
| KJ Decontamination Services Limited | Health & social care | 2023 |
| KJ Medical Limited | Health & social care | 2019 |
| KJ Recruitment Ltd | Administrative & support | 2026 |
| KJA Tech Limited | Administrative & support | 2014 |
| KJD Communications Ltd | Information & communication | 2015 |
| KJD Somerset Ltd | Real estate | 2023 |
| KJE Technical Limited | Arts & recreation | 2012 |
| KJH Holdings Ltd | Financial services | 2022 |
| KJR6 Limited | Real estate | 2019 |
| KJS Plant Hire Limited | Construction | 2009 |
| KJZ Limited | Health & social care | 2023 |
| KK Food U.K Ltd | Hospitality | 2025 |
| KK Guarding Ltd | Administrative & support | 2022 |
| KK Info Solutions Limited | Information & communication | 2022 |
| KK Raval Ltd | Wholesale & retail | 2026 |
| KK Retail Ltd | Other services | 2018 |
| Kkarma Limited | Information & communication | 2012 |
| Kkaya Solution Limited | Real estate | 2026 |
| KKD Properties Ltd | Real estate | 2019 |
| Kkkt Kimara Diaspora UK CIC | Other services | 2024 |
| Kkmg Ltd | Professional & scientific | 2013 |
| KKP Group 22 Limited | Administrative & support | 2023 |
| KKP Group 23 Ltd | Administrative & support | 2023 |
| KKS Maty Logistic Ltd | Transport & logistics | 2024 |
| KL Air Conditioning Ltd | Construction | 2015 |
| KL Psychology Ltd | Professional & scientific | 2022 |
| Klarina LP | | 2012 |
| Klarvex Partners Limited | Information & communication | 2025 |
| KLB Renovations Ltd | Construction | 2025 |
| Klea Properties Limited | Real estate | 2021 |
| Klea Sunpower Limited | Professional & scientific | 2020 |
| Kleanbiz Ltd | Administrative & support | 2025 |
| Klear Clinic Ltd | Health & social care | 2024 |
| Kleeneze - Koti Limited | Manufacturing | 1990 |
| Kleeneze Sealtech Limited | Extraterritorial | 2012 |
| Kleiner Gaines Property Limited | Real estate | 2012 |
| Klewis Limited | Health & social care | 2025 |
| KLF Construction SW Ltd | Construction | 2022 |
| KLH Property Limited | Real estate | 2018 |
| Klidi Ltd | Information & communication | 2025 |
| Klifberg LP | | 2015 |
| Kliklok International Limited | Manufacturing | 1965 |
| Klio Creative Ltd | Other services | 2024 |
| Klirpi Ltd. | Hospitality | 2025 |
| KLJ Building Services Ltd | Construction | 2023 |
| KLJ Financial Consulting Ltd | Information & communication | 2018 |
| Kljm Management Limited | Real estate | 2021 |
| KLM Cleaning Services Ltd | Administrative & support | 2023 |
| KLM Electrical Solutions Limited | Construction | 2016 |
| KLM Utilities UK Limited | Financial services | 2025 |
| KLN Transport Limited | Administrative & support | 2025 |
| Kloozee Ltd | Information & communication | 2022 |
| Kloset by Khandi Ltd | Wholesale & retail | 2018 |
| Klta Ltd | Other services | 2016 |
| Klump Clothing & Design Ltd | Manufacturing | 2021 |
| Klure Limited | Health & social care | 2025 |
| Klurig Ltd | Information & communication | 2025 |
| Klyra Snowsports Ltd | Wholesale & retail | 2025 |
| KM Carpentry Ltd | Manufacturing | 2018 |
| KM Change Consulting Limited | Professional & scientific | 2020 |
| KM Luxury Accommodation Ltd | Extraterritorial | 2024 |
| KM Newsagents Limited | Wholesale & retail | 2019 |
| KM Top Nail Limited | Other services | 2024 |
| KM Truckwash Ltd | Administrative & support | 2021 |
| Kmad Consulting Ltd | Professional & scientific | 2026 |
| Kmba South West Limited | Manufacturing | 2026 |
| Kmbk Property Limited | Real estate | 2025 |
| KMC Cleaning (Construction) Limited | Administrative & support | 2012 |
| KMC Distribution Limited | Wholesale & retail | 1969 |
| Kmhl Limited | Manufacturing | 2016 |
| Kmhl Property Limited | Real estate | 2020 |
| KMJ Electrical Limited | Construction | 2014 |
| KMK Consulting Engineers Ltd | Professional & scientific | 2015 |
| KMK Stands Ltd | Professional & scientific | 2019 |
| KMP Accounting Ltd | Professional & scientific | 2021 |
| KMR Communications Limited | Professional & scientific | 2015 |
| KMR Enterprises Ltd | Administrative & support | 2019 |
| KMW Building Limited | Construction | 2003 |
| KMW Properties Limited | Real estate | 1996 |
| KMW SET Construction Ltd | Construction | 2017 |
| KMW Trading Limited | Real estate | 2016 |
| KMY Food Bristol Ltd | Hospitality | 2025 |
| KN Accounts & Book-Keeping Services Ltd | Professional & scientific | 2025 |
| KN Bristol Ltd | Real estate | 2024 |
| KN Consulting Ltd | Professional & scientific | 2014 |
| KN Telecom Ltd | Information & communication | 2023 |
| KN Wellness Ltd | Extraterritorial | 2016 |
| KNA Studios Limited | Information & communication | 2024 |
| Knapp Property Development Limited | Construction | 2019 |
| Knaulage DB Limited | Information & communication | 2001 |
| KND Studio Ltd | Professional & scientific | 2025 |
| Knda Consulting Ltd | Real estate | 2019 |
| Knda Investing Ltd | Real estate | 2017 |
| Knee Financial Planning Ltd | Financial services | 2023 |