| Kerri Mansfield Ltd | Information & communication | 1996 |
| Kerriealdo Ltd. | Manufacturing | 2017 |
| Keskarra Limited | Professional & scientific | 2022 |
| Kevin Baker Ltd | Information & communication | 2016 |
| Keystone Interim Solutions Limited | Professional & scientific | 2026 |
| Keystone Value Advisors Limited | Professional & scientific | 2025 |
| Kfam Services UK Limited | Wholesale & retail | 2026 |
| KGB Property Developments Ltd | Real estate | 2024 |
| Khronos Tech Limited | Information & communication | 2021 |
| KHW Investments Ltd | Real estate | 2023 |
| KI SAM Limited | Professional & scientific | 2025 |
| Kiara Engineers Limited | Information & communication | 2025 |
| Kiba Labs Ltd. | Information & communication | 2017 |
| Kids Camera Action Ltd | Information & communication | 2015 |
| Kids Camera Action Productions Ltd | Information & communication | 2020 |
| Kidstime Best Games for Kids LLP | | 2022 |
| Kieran Mills Consultancy Limited | Information & communication | 2022 |
| Kiklex Ltd | Information & communication | 2017 |
| Kilsyth Logistics Limited | Transport & logistics | 2024 |
| Kilter Property Limited | Real estate | 2021 |
| Kimura Energy Limited | Professional & scientific | 2023 |
| Kinetic Healthcare Limited | Health & social care | 2013 |
| Kinetic Mobility Limited | Manufacturing | 2017 |
| King Contracting Limited | Professional & scientific | 2023 |
| King's Virtual PA Services Ltd | Administrative & support | 2020 |
| Kingfisher Electrical Contractors Limited | Construction | 1989 |
| Kingfisher Home & Garden Services Limited | Administrative & support | 2026 |
| Kings Office Furniture Limited | Wholesale & retail | 2014 |
| Kings Stag Joinery Ltd | Construction | 2021 |
| Kings Walk 2003 Limited | Households | 2004 |
| Kings Wimborne Limited | Financial services | 2012 |
| Kingsbere Leisure Ltd | Hospitality | 2020 |
| Kingsleigh Court Freehold Limited | Households | 2003 |
| Kingsway Group Holdings Ltd | Financial services | 2021 |
| Kingsway Plastering Limited | Construction | 2021 |
| Kinship Capital Limited | Real estate | 2024 |
| Kipeco Consultancy Limited | Professional & scientific | 2007 |
| Kipling Terrace Company Limited | Households | 1987 |
| Kirbydene Properties Limited | Construction | 1984 |
| Kiriko Ltd | Information & communication | 2014 |
| Kirsty Newman Design Ltd | Professional & scientific | 2026 |
| Kitchen Ventilation Systems Limited | Construction | 2011 |
| KJ Hutchins Limited | Information & communication | 2022 |
| Kjam Property Ltd | Construction | 2021 |
| Kjca Property Limited | Real estate | 2023 |
| Klava Code Limited | Information & communication | 2024 |
| Klawer Limited | Manufacturing | 2025 |
| Kleine Held Ltd | Professional & scientific | 2024 |
| KLM Communications Limited | Professional & scientific | 2023 |
| KLT Properties Limited | Real estate | 2020 |
| Knight Business Services Limited | Professional & scientific | 2012 |
| KNJ Roofing Limited | Water & waste | 2018 |
| KNO Schools Limited | Education | 2020 |
| Knoll Gardens Limited | Agriculture & fishing | 2012 |
| Knott Construction Ltd | Construction | 2021 |
| Know Howe Consulting Ltd | Information & communication | 2021 |
| Know-It-All Consulting Limited | Information & communication | 2008 |
| Knowledge Horizon Limited | Professional & scientific | 2005 |
| Knowledge TEK Limited | Information & communication | 2017 |
| Knowlton Holdings Binfield Ltd | Other services | 2022 |
| Knowlton Holdings Ltd | Construction | 2019 |
| KO PSC Limited | Professional & scientific | 2021 |
| Koast (Southern) Limited | Other services | 2022 |
| Kompliance Consulting Limited | Administrative & support | 2022 |
| Konnect Studios Limited | Information & communication | 2024 |
| Koone Investment Limited | Real estate | 2020 |
| Koplant Construction Training Limited | Education | 2019 |
| KOR Reporting UK Limited | Information & communication | 2023 |
| Kortissi Ltd | Hospitality | 2024 |
| Kouki Limited | Information & communication | 2025 |
| KPC Leisure Ltd | Wholesale & retail | 2013 |
| Kpmorgan and Sons Limited | Health & social care | 2024 |
| KQJ Ltd | Professional & scientific | 2018 |
| KQJ Property 1 Ltd | Real estate | 2025 |
| KR Private Limited | Information & communication | 2016 |
| KR15 Assets Limited | Real estate | 2024 |
| KR15 Estates Limited | Real estate | 2022 |
| KR15 Limited | Financial services | 2021 |
| Kraken Associates Ltd | Wholesale & retail | 2019 |
| Kreher Consult Ltd | Professional & scientific | 2023 |
| KS Wimborne Limited | Real estate | 2017 |
| KSG Painting & Decorating Ltd | Construction | 2014 |
| KSM Health Communications Limited | Professional & scientific | 2025 |
| KST Services Limited | Administrative & support | 2025 |
| KT Consulting & Advisory Ltd | Professional & scientific | 2022 |
| Kubanacor Ltd | Real estate | 2022 |
| Kube Productions Ltd | Other services | 2013 |
| Kuma Research Ltd | Information & communication | 2023 |
| Kupenya Limited | Public administration | 2023 |
| Kurt Properties Limited | Real estate | 2020 |
| KV Dental Limited | Health & social care | 2022 |
| KVH Consulting Ltd | Information & communication | 2021 |
| KW Electrical Contracting Ltd | Construction | 2018 |
| Kwelanga Limited | Information & communication | 2016 |
| Kweli Ltd | Professional & scientific | 2014 |
| Kykrish Property Services Ltd | Real estate | 2022 |
| Kynance (Outsourcing) Limited | Professional & scientific | 2020 |
| Kynance Associates Ltd. | Professional & scientific | 2009 |
| Kynance Ltd. | Professional & scientific | 2002 |
| L B Paine Limited | Information & communication | 2013 |