| KBH Interiors Ltd | Professional & scientific | 2025 |
| Kbns Limited | Real estate | 2025 |
| KBP Group Limited | Financial services | 2026 |
| KBR Properties (Bishop`S Stortford) Limited | Real estate | 2006 |
| KBS25 Media Ltd | Other services | 2016 |
| KCM Music Ltd | Manufacturing | 2023 |
| KD 76 Investments Limited | Wholesale & retail | 2022 |
| KD Barbers Gravesend Ltd | Other services | 2025 |
| KD Digital Ltd. | Information & communication | 2020 |
| KDH Direct Ltd | Wholesale & retail | 2023 |
| Kdnn Investments Limited | Real estate | 2023 |
| KDS 94 Limited | Financial services | 2021 |
| KDS WDC Limited | Health & social care | 2021 |
| Keamor Limited | Real estate | 2024 |
| Keandjj Ltd | Wholesale & retail | 2023 |
| Kearsley News and Wines Ltd | Wholesale & retail | 2024 |
| Kebab, Desserts & Snack Ltd | Hospitality | 2024 |
| Keen AS Mustard Productions Limited | Construction | 2019 |
| Keen Cosmetic Ltd | Wholesale & retail | 2025 |
| Keep IT Commercial Limited | Real estate | 2019 |
| Keep My Books Ltd | Construction | 2015 |
| Keep Rolling Project CIC | Arts & recreation | 2022 |
| Kefalonia Property Management Limited | Households | 2021 |
| Keik Bureau Ltd | Professional & scientific | 2012 |
| Keki Construction Limited | Construction | 2018 |
| Keles Transport Limited | Transport & logistics | 2026 |
| Keltor Limited | Professional & scientific | 2025 |
| Kembury Limited | Professional & scientific | 2025 |
| Kempbridge Care Limited | Health & social care | 2011 |
| KEN Carson Ltd | Wholesale & retail | 2025 |
| Kenburgh Court Limited | Real estate | 1999 |
| Kenroad Limited | Households | 1997 |
| Kensington Aesthetics Limited | Health & social care | 2022 |
| Kensington EYE Centre Limited | Health & social care | 2004 |
| Kensons Holdings (UK) Ltd | Real estate | 2013 |
| Kenton Global Limited | Administrative & support | 2026 |
| Kenuk Ltd | Professional & scientific | 2009 |
| Keran Capital Limited | Real estate | 2025 |
| Kernel Diagnostic Laboratories Ltd | Professional & scientific | 2021 |
| Kersley Enterprises Limited | Arts & recreation | 2018 |
| Kertel Ltd | Wholesale & retail | 2020 |
| Kesar Indian Grocery & Sweets Ltd | Wholesale & retail | 2025 |
| Kessey Construction Limited | Construction | 2002 |
| Kestar Ltd | Wholesale & retail | 2019 |
| Ketonara Limited | Professional & scientific | 2022 |
| Kets Consultancy Ltd | Information & communication | 2024 |
| KEV Construct Ltd | Construction | 2019 |
| Keva UK Limited | Professional & scientific | 2007 |
| Kevlar Asset Services Ltd | Construction | 2026 |
| KEW Capital Holdings Limited | Other services | 2016 |
| Key BM Ltd | Professional & scientific | 2017 |
| Key Bridge Properties Ltd | Real estate | 2024 |
| Key Building Limited | Construction | 2018 |
| Key Business Consultants LLP | | 2013 |
| Key Lets Property Management Ltd | Extraterritorial | 2022 |
| Key Sounds Music Limited | Education | 2024 |
| Key West Residents Association Limited | Households | 2017 |
| Keygrange Investments Limited | Real estate | 2015 |
| Keyrate Mortgages Limited | Financial services | 2022 |
| Keys & Gates UK Ltd | Administrative & support | 2025 |
| Khadija Khan Ltd | Wholesale & retail | 2026 |
| Khaleel Ltd | Wholesale & retail | 2024 |
| Khalid Property Investments Ltd | Real estate | 2022 |
| Khan Auto & Tyres Ltd | Wholesale & retail | 2019 |
| Khan Car Hire Ltd | Administrative & support | 2019 |
| Khan Souvenir Ltd | Wholesale & retail | 2025 |
| Khan Supermarket London Ltd | Wholesale & retail | 2021 |
| Khandealdrops Limited | Wholesale & retail | 2026 |
| Khasha Ltd | Real estate | 2017 |
| Khashiki Ltd | Wholesale & retail | 2020 |
| KHE Assets Ltd | Real estate | 2024 |
| Khetani Ltd | Information & communication | 2015 |
| Khim Consultancy Ltd | Professional & scientific | 2016 |
| Khodal Enterprise Ltd | Wholesale & retail | 2024 |
| Khor ENG Suan Ltd | Public administration | 2015 |
| Khorasan Enterprise Ltd | Real estate | 2024 |
| Khosh Limited | Other services | 2020 |
| Khristine Bautista Ltd | Health & social care | 2022 |
| Khushi's Coffee House Limited | Hospitality | 2024 |
| Khushil Next-Gen Fuel Limited | Wholesale & retail | 2024 |
| Kiana Fashion Ltd | Wholesale & retail | 2025 |
| Kibon Logistics Limited | Transport & logistics | 2025 |
| Kick IT WIT Kemz Ltd | Financial services | 2015 |
| Kickham Road Consulting Limited | Information & communication | 2017 |
| KIDOLO1 Limited | Professional & scientific | 2026 |
| Kidzplay London Limited | Arts & recreation | 2024 |
| Kidzplayearlyrise Ltd | Health & social care | 2025 |
| Kikko Ltd | Hospitality | 2022 |
| Kiko Lifting Ltd | Construction | 2024 |
| Kiku Restaurants Limited | Hospitality | 1992 |
| Kilifi Investments Ltd | Hospitality | 2014 |
| KIM Creates Ltd | Professional & scientific | 2024 |
| Kimberley Property Investments Limited | Real estate | 2001 |
| Kimelda Limited | Professional & scientific | 2023 |
| Kims London House Ltd | Real estate | 2019 |
| Kindthorpe Limited | Administrative & support | 2017 |
| King Squared Ltd | Information & communication | 2025 |
| Kingdom Advancement Funding Limited | Financial services | 2021 |
| Kingdom Builders (INT) Limited | Construction | 2018 |
| Kingdom Writing Solving Problems & Legal Support Services Limited | Information & communication | 2020 |