| Kogent Consulting Ltd | Professional & scientific | 2008 |
| Koincable Electronics Co., Ltd | Extraterritorial | 2020 |
| Kokoxun Trading Limited | Wholesale & retail | 2025 |
| Kola Entertainment Limited | Information & communication | 2026 |
| Kolbe Translations Ltd | Information & communication | 2003 |
| Kollective Solutions Ltd | Professional & scientific | 2025 |
| Kolly Group Co., Ltd | Manufacturing | 2024 |
| Kolz Management and Investments Limited | Financial services | 2025 |
| Komax International HK Co., Ltd | Extraterritorial | 2014 |
| Kompas Advising Limited | Professional & scientific | 2026 |
| Konarak Limited | Administrative & support | 2023 |
| Kongle Limited | Wholesale & retail | 2016 |
| Koni Aviation Ltd | Manufacturing | 2026 |
| Konsond Limited | Extraterritorial | 2012 |
| Koplin Group Cambridge Ltd | Construction | 2023 |
| Koplin Service Ltd | Construction | 2025 |
| Korea Kegu Chemical Co., Ltd. | Extraterritorial | 2025 |
| Kormos Composites Ltd | Manufacturing | 2017 |
| Kornix Ltd | Wholesale & retail | 2026 |
| Korovesis Ltd | Manufacturing | 2023 |
| Korries Plastering Ltd | Construction | 2024 |
| Koru Consult Ltd | Professional & scientific | 2016 |
| Koryon Motorsport (UK) Limited | Administrative & support | 2025 |
| Korzhov Holding UK Limited | Financial services | 2022 |
| Kostas Bartsokas Limited | Information & communication | 2014 |
| Kostassime Ltd | Manufacturing | 2024 |
| Kottrading Limited | Wholesale & retail | 2023 |
| Koulandougou Trading Co., Ltd | Wholesale & retail | 2023 |
| Kousan Consulting Ltd | Professional & scientific | 2026 |
| Kousan Ltd | Real estate | 2016 |
| Koutresi Medcal Services Ltd | Health & social care | 2014 |
| Kovans Environmental Technology Co., Ltd. | Manufacturing | 2026 |
| Kovision Consultants Limited | Information & communication | 2025 |
| Koviss Technics SMW Ltd | Manufacturing | 2026 |
| Kowhai Holdings Ltd | Information & communication | 2021 |
| Koza Aircraft Spanner Ltd | Manufacturing | 2022 |
| Kozlowski Composites Ltd | Manufacturing | 2024 |
| Kozlowski Laminating Limited | Manufacturing | 2025 |
| KP Cambridge Ltd | Wholesale & retail | 2024 |
| KP Capital Holding Corporation Ltd | Financial services | 2025 |
| KP CNC LV Machining Solutions Ltd | Manufacturing | 2025 |
| KPL Endo Ltd | Health & social care | 2023 |
| Kpms Privates Limited | Real estate | 2021 |
| KPT International Trading Co., Ltd | Wholesale & retail | 2025 |
| KR2 Investments Limited | Professional & scientific | 2018 |
| Kraft Construction Ltd. | Construction | 2023 |
| Krai Ltd | Professional & scientific | 2020 |
| Kralium Industrial Ltd | Wholesale & retail | 2024 |
| Kralium Ltd | Wholesale & retail | 2013 |
| Krank Limited | Information & communication | 2016 |
| Kratisis Limited | Information & communication | 2021 |
| Krcp Properties Limited | Real estate | 2015 |
| Kristensson Consulting Limited | Professional & scientific | 2025 |
| Krizek Aviation Ltd | Manufacturing | 2026 |
| KRS1 Properties Limited | Real estate | 2025 |
| Krshilets Limited | Real estate | 2026 |
| Krumplehorn Ltd. | Manufacturing | 2005 |
| Krusky Ltd | Hospitality | 2025 |
| KRW Software Ltd | Information & communication | 2025 |
| KSJ Property Management Ltd | Households | 2023 |
| Ksne Ltd | Hospitality | 2024 |
| Ksnza Investment Ltd | Wholesale & retail | 2025 |
| KSR Storage & Logistics Ltd | Transport & logistics | 2009 |
| Ksthl Labels Co., Ltd | Manufacturing | 2026 |
| KTL Housing Ltd | Real estate | 2025 |
| KU Trading Limited | Professional & scientific | 2018 |
| Kuano Ltd | Information & communication | 2020 |
| Kubo Digital Limited | Information & communication | 2017 |
| Kubos Semiconductors Ltd | Manufacturing | 2017 |
| Kucinas Contracting Ltd | Construction | 2025 |
| Kudos Pharmaceuticals Limited | Administrative & support | 1997 |
| Kukgroups Ltd | Wholesale & retail | 2025 |
| Kummana Ltd | Real estate | 2024 |
| Kunhui Industry Co., Ltd | Extraterritorial | 2021 |
| Kunshan AC Industry Co., Ltd | Extraterritorial | 2018 |
| Kuocian Limited | Information & communication | 2024 |
| Kurashikku Imports Ltd | Wholesale & retail | 2019 |
| Kurt Louis Studios Limited | Arts & recreation | 2021 |
| Kutchenhaus Cambridge Limited | Wholesale & retail | 2024 |
| Kuul Labs Ltd | Other services | 2022 |
| Kuwik Ltd | Health & social care | 2013 |
| Kuzeyada Limited | Real estate | 2024 |
| KV Innovations Ltd | Construction | 2016 |
| KV62 2023 Ltd | Professional & scientific | 2023 |
| KVM Limited | Manufacturing | 2005 |
| KW Collective Ltd | Administrative & support | 2023 |
| KWA Architects (Cambridge) Limited | Professional & scientific | 2005 |
| KWA Composites Ltd | Manufacturing | 2026 |
| Kweens of Cleans Ltd | Administrative & support | 2024 |
| Kwizda Agro UK Ltd | Agriculture & fishing | 2022 |
| KWM (UK) Limited | Wholesale & retail | 2025 |
| Kylie Caldwell (Pimp Your Pump) Limited | Wholesale & retail | 2017 |
| Kylin Co., Ltd | Extraterritorial | 2012 |
| Kylinx Ltd | Households | 2023 |
| Kymab Group Limited | Administrative & support | 2016 |
| Kymab Limited | Professional & scientific | 2009 |
| Kynesim (Holdings) Ltd | Information & communication | 2011 |
| Kynesim Limited | Information & communication | 2007 |
| Kynetech Solutions Ltd | Information & communication | 2025 |
| Kyng Advisors Limited | Professional & scientific | 2022 |