| Kiaan & Co Services Ltd | Administrative & support | 2025 |
| Kiahntra IT Ltd | Information & communication | 2026 |
| Kian Solutions Ltd | Information & communication | 2018 |
| Kiasan Consultancy Ltd | Professional & scientific | 2025 |
| Kiasan Investments Ltd | Real estate | 2022 |
| Kiboko Group Ltd | Professional & scientific | 2020 |
| Kick the Cask | Other services | 2025 |
| Kickfolks Limited | Wholesale & retail | 2026 |
| KID Logistic Ltd | Transport & logistics | 2025 |
| Kiddiecare Daycare Ltd | Education | 2025 |
| Kiddiecare Nurseries Ltd | Education | 2004 |
| Kiddistaff Limited | Education | 2006 |
| Kids Toyz Ltd | Wholesale & retail | 2021 |
| Kidz 1ST Community Project | Education | 2011 |
| Kidz Daycare Limited | Health & social care | 2026 |
| Kiesha Developments Ltd | Real estate | 2019 |
| Kiesha Ltd | Professional & scientific | 2014 |
| Kifaru Properties Ltd | Real estate | 2020 |
| Kigali Releasing Limited | Information & communication | 2003 |
| Kiin Store Ltd | Other services | 2014 |
| Kiingvape Limited | Wholesale & retail | 2023 |
| Kijiji Swim Ltd | Arts & recreation | 2026 |
| Kiki Home Ltd | Wholesale & retail | 2026 |
| Kiki's Bakehouse Limited | Hospitality | 2021 |
| Kikki Ltd | Other services | 2026 |
| Kikku Properties Ltd | Real estate | 2019 |
| Kiklo Ltd | Wholesale & retail | 2017 |
| KIL Investments Limited | Real estate | 1983 |
| Kilborn Family Investments Limited | Administrative & support | 2026 |
| Kilborn Realty Limited | Real estate | 2026 |
| Kilburn Cycles (London) Limited | Wholesale & retail | 2020 |
| Killer Apps Limited | Information & communication | 2006 |
| Killick Yachting Limited | Transport & logistics | 2012 |
| Killthestress Limited | Education | 2019 |
| Kiln Chamber Limited | Professional & scientific | 2026 |
| KIM & BAB Limited | Hospitality | 2023 |
| KIM Brant Consultancy Limited | Professional & scientific | 2021 |
| KIM Electrical Services Ltd | Construction | 2025 |
| Kimberlite Sports Group Limited | Administrative & support | 2022 |
| Kimti Securities Ltd. | Financial services | 2000 |
| Kind Global Limited | Manufacturing | 2020 |
| Kind Motivation Ltd | Other services | 2022 |
| Kindervale Preschool Ltd | Professional & scientific | 2024 |
| Kindledlight Ltd | Manufacturing | 2025 |
| Kindred Pursuits Ltd | Information & communication | 2020 |
| Kindred Support Ltd | Information & communication | 2020 |
| Kindshea. Limited | Wholesale & retail | 2019 |
| Kindulge Limited | Hospitality | 2022 |
| Kinetics IT Limited | Information & communication | 2020 |
| King's Church Harrow | Other services | 2002 |
| Kingdom Legal Chambers LLP | | 2025 |
| Kingdom Legal Ltd | Other services | 2021 |
| Kingfisher 13-02 Limited | Real estate | 2024 |
| Kingfisher Bay Limited | Transport & logistics | 2012 |
| Kings Cliffe Joinery Ltd | Manufacturing | 2010 |
| Kings Commercial Ltd | Real estate | 2019 |
| Kings Industries Limited | Administrative & support | 2004 |
| Kings Kitchens Ltd | Wholesale & retail | 1992 |
| Kings Langley Developments Ltd | Construction | 2020 |
| Kings Mews (George Street) Limited | Real estate | 2025 |
| Kings Oak Addison Estate LLP | | 2019 |
| Kings Oak Addison Ltd | Real estate | 2019 |
| Kings Oak Asset Management Ltd | Real estate | 2020 |
| Kings Oak Asset Portfolio Ltd | Real estate | 2017 |
| Kings Oak Brunel LLP | | 2019 |
| Kings Oak Chicago Ltd | Real estate | 2021 |
| Kings Oak Club Ltd | Real estate | 2023 |
| Kings Oak Cowley 2 Ltd | Real estate | 2023 |
| Kings Oak Cowley Ltd | Real estate | 2019 |
| Kings Oak Elmgrove Ltd | Real estate | 2018 |
| Kings Oak Harvard Ltd | Real estate | 2022 |
| Kings Oak Hawaii Ltd | Real estate | 2024 |
| Kings Oak Headstone Ltd | Real estate | 2019 |
| Kings Oak Holdings Ltd | Construction | 2017 |
| Kings Oak Hub LLP | | 2021 |
| Kings Oak KAP House Ltd | Real estate | 2019 |
| Kings Oak KAP LLP | | 2019 |
| Kings Oak Kelly House Ltd | Real estate | 2020 |
| Kings Oak Kelly LLP | | 2019 |
| Kings Oak Management Ltd | Real estate | 2018 |
| Kings Oak New York Ltd | Real estate | 2020 |
| Kings Oak SAN Diego Ltd | Real estate | 2021 |
| Kings Oak Sky Hub LLP | | 2021 |
| Kings of Translation Ltd | Professional & scientific | 2020 |
| Kings Residential Limited | Real estate | 2018 |
| Kings' Oak Ocean Ltd | Real estate | 2021 |
| Kingsbridge Assets LLP | | 2018 |
| Kingsbridge Commercial Keera LLP | | 2019 |
| Kingsbridge Investments 2 Ltd | Real estate | 2023 |
| Kingsbridge Investments Ltd | Real estate | 2018 |
| Kingsbridge Securities Limited | Financial services | 1986 |
| Kingsbrook Retail Ltd | Real estate | 2025 |
| Kingsbury Food and Wine Ltd | Wholesale & retail | 2017 |
| Kingsbury Road Residents Company Limited | Households | 1980 |
| Kingscope Ltd | Construction | 2020 |
| Kingsfield Arms Ltd | Hospitality | 2016 |
| KINGSGATE73 Ltd | Other services | 2024 |
| Kingsgreen Properties Limited | Real estate | 2008 |
| Kingsley Avenue Borehamwood Management Limited | Households | 1988 |
| Kingsley Events Limited | Other services | 2012 |