| Kaiyi Marine Service Co., Ltd | Manufacturing | 2024 |
| Kaleidoscope Wealth Consulting Limited | Administrative & support | 2024 |
| Kalel Holdings Ltd | Real estate | 2026 |
| Kamenous Limited | Real estate | 2021 |
| Kandelia Investments Limited | Real estate | 2018 |
| Kandelia Pharma Limited | Health & social care | 2019 |
| Kandl Collective Limited | Other services | 2015 |
| Kanfe Investment Co., Limited | Professional & scientific | 2007 |
| Kang Ning Limited | Manufacturing | 2024 |
| Kangjing Chemical Group UK Co., Limited | Mining & quarrying | 2023 |
| Kangpad Industrial Limited | Manufacturing | 2024 |
| Kangpu (Oumaisi) Energy Mining Group Ltd | Extraterritorial | 2023 |
| Kantan Design & Consulting Ltd | Professional & scientific | 2025 |
| KAP Ltd | Administrative & support | 2025 |
| Kapi Homes Limited | Real estate | 2019 |
| Kaplan Import & Export Co., Ltd. | Manufacturing | 2024 |
| Karine Chemical Co., Ltd | Extraterritorial | 2023 |
| Karing Global Consulting Co., Ltd | Extraterritorial | 2025 |
| Karl Industrial Co., Ltd. | Manufacturing | 2024 |
| Karmavale Co., Limited | Extraterritorial | 2020 |
| Kartingstar Transmission Co., Ltd | Extraterritorial | 2018 |
| KAS Estates Ltd | Households | 2025 |
| KAS Industry Co., Limited | Extraterritorial | 2023 |
| Kasa Houseware Co., Ltd | Extraterritorial | 2018 |
| Kaskai Property Services Ltd | Financial services | 2024 |
| Kasong Machinery Co., Ltd | Extraterritorial | 2021 |
| Kasos Sakhalin Limited | Wholesale & retail | 2021 |
| Kassar Co., Ltd | Extraterritorial | 2018 |
| Kassbohrer Power (UK) Group Limited | Professional & scientific | 2016 |
| KAT Building & Decorating Ltd | Construction | 2025 |
| Katie France London Limited | Professional & scientific | 2024 |
| KAV Audiovisual Technology Co., Limited | Extraterritorial | 2008 |
| Kavi Auto Parts Co., Ltd. | Extraterritorial | 2014 |
| Kawe Lighting Co., Ltd | Extraterritorial | 2011 |
| Kaxa Motos Co., Ltd | Manufacturing | 2022 |
| Kaykay Imp&Exp Co., Limited | Extraterritorial | 2021 |
| Kayonjaes Ice Cream Ltd | Manufacturing | 2022 |
| Kaytus UK Co., Ltd | Wholesale & retail | 2024 |
| Kazar Properties Ltd | Real estate | 2024 |
| KBC Industrial Co., Ltd | Professional & scientific | 2014 |
| KCC Industrial Enterprise Limited | Extraterritorial | 2006 |
| Kcloudx Limited | Extraterritorial | 2021 |
| Kclt Associates Ltd | Real estate | 2024 |
| KCS Delight Catering Limited | Hospitality | 2013 |
| KD Cleaning Services London Ltd | Other services | 2009 |
| Kdcs London Ltd | Other services | 2010 |
| Kdelaney Properties Ltd | Real estate | 2021 |
| KDS Hardwoods Ltd | Extraterritorial | 2014 |
| Kearns Marketing & Consultancy Limited | Administrative & support | 2017 |
| Kebbel Fluid Control Limited | Manufacturing | 2023 |
| Keco Group Co., Ltd. | Extraterritorial | 2017 |
| Kede Ship Service Co., Ltd | Manufacturing | 2025 |
| Keefe Telecommunications Limited | Construction | 2023 |
| Keen Dragon Sports Company Limited | Wholesale & retail | 2020 |
| Keen Worth Limited | Wholesale & retail | 2026 |
| Keepon Machinery Import & Export Co., Ltd | Extraterritorial | 2023 |
| Kefeilin International Co., Limited | Manufacturing | 2022 |
| Kefeng Limited | Wholesale & retail | 2023 |
| Kefii the Spirit of Joy Ltd | Wholesale & retail | 2022 |
| KEG Group Co., Ltd | Manufacturing | 2018 |
| Kehan Ship Engineer Co., Ltd | Manufacturing | 2023 |
| Keikomr Machinery (China) Co., Ltd | Extraterritorial | 2018 |
| Kelifu Group Co. Limited | Manufacturing | 2026 |
| Kelmera Limited | Information & communication | 2003 |
| Kelsey Court Management Company Limited | Households | 1981 |
| Kelsey Estates Ltd | Real estate | 2019 |
| Kelsey Gate Management Company Limited | Households | 1989 |
| Kelsey Healthcare Limited | Health & social care | 2009 |
| Kelsey Lakeside Management Limited | Households | 1965 |
| Kelunte Bearing International Limited | Professional & scientific | 2017 |
| Kem.H. Ltd | Other services | 2022 |
| Kemerton Park Beckenham Maintenance Limited | Households | 1967 |
| Kemikoul Pigments (UK) Ltd. | Manufacturing | 2024 |
| Kemiou (UK) Co Limited | Extraterritorial | 2020 |
| Kenana Trading Co Ltd | Extraterritorial | 2020 |
| Keniceo International Ltd | Wholesale & retail | 2023 |
| Kennedy Decorators Limited | Construction | 2008 |
| Kennedy Events Consultancy Ltd | Administrative & support | 2024 |
| Kensal Green Consulting Co., Ltd | Other services | 2013 |
| Kent House Medical Limited | Health & social care | 2021 |
| Kenthouseconsultancy Ltd | Education | 2022 |
| Kenthousedaynursery Ltd | Health & social care | 2019 |
| Kenti Fluid Control Ltd. | Manufacturing | 2026 |
| Kenti Process Control Ltd. | Manufacturing | 2021 |
| Kentwell Associates Ltd | Professional & scientific | 2006 |
| Keon Trading Limited | Wholesale & retail | 2022 |
| Kerm Building Works Limited | Construction | 2024 |
| Kernow Developments Limited | Real estate | 2025 |
| Keromee Co., Ltd | Wholesale & retail | 2023 |
| Kerui Graphite Limited | Wholesale & retail | 2021 |
| Kesoon Fine Chemical Co. Limited | Extraterritorial | 2005 |
| Kettering International Limited | Extraterritorial | 2019 |
| Key Solutions Europe Limited | Administrative & support | 2014 |
| Keyjewels Steel Pipe Co., Ltd | Professional & scientific | 2020 |
| Keyline Roofing & General Maintenance Ltd | Construction | 2025 |
| Keylink Transport Limited | Transport & logistics | 2019 |
| Keystone Commodity Holdings Limited | Professional & scientific | 2016 |
| Keystone Investments Group Ltd | Wholesale & retail | 2024 |
| Keystone Studios Limited | Professional & scientific | 2002 |
| Keyway Construction Consultants Limited | Professional & scientific | 2006 |