| Khadine Parkinson Consulting Limited | Professional & scientific | 2021 |
| Khaira Double Glazing Ltd | Manufacturing | 2025 |
| Khal Dates Ltd | Manufacturing | 2026 |
| Khalifa 7 Limited | Wholesale & retail | 2025 |
| Khans & Sons Ltd | Real estate | 2021 |
| Khanzada Butchers Limited | Wholesale & retail | 2025 |
| Kharay Consulting Ltd | Administrative & support | 2024 |
| Khas Designs Limited | Wholesale & retail | 2020 |
| Khasriya Limited | Construction | 2017 |
| Khateda Property Limited | Real estate | 2025 |
| Khatibzada Foundation Ltd | Health & social care | 2025 |
| Khattak Engineering and Build Consultants Ltd | Professional & scientific | 2019 |
| Khawaja Affan Institutional Academy Ltd | Education | 2023 |
| Khaza Islam Developments Limited | Professional & scientific | 2024 |
| Khidr Limited | Wholesale & retail | 2015 |
| Khinda Burewal Creations UK Limited | Real estate | 2025 |
| Khinda Developments Ltd | Construction | 2018 |
| Khushhal Ltd | Real estate | 2020 |
| Khushi Homes Ltd | Construction | 2020 |
| Khuteibam Ltd | Wholesale & retail | 2024 |
| Khyber Grill Limited | Real estate | 2012 |
| Kiane London Ltd | Wholesale & retail | 2024 |
| Kiberone (UK) Ltd | Education | 2024 |
| Kicking Dickey Limited | Hospitality | 2023 |
| Kiddos Softplay Cafe Ltd | Arts & recreation | 2023 |
| Kiddy Kingdom Ltd | Wholesale & retail | 2025 |
| Kids Gift Limited | Wholesale & retail | 2014 |
| Kids R US Limited | Education | 2007 |
| Kids Toys Ltd | Wholesale & retail | 2020 |
| Kids Wearhouse Limited | Wholesale & retail | 2007 |
| Kierania Ventures Limited | Health & social care | 2013 |
| Kigili Property and Construction Services Ltd | Construction | 2025 |
| Kigrai Logistic Limited | Transport & logistics | 2025 |
| Kike Alase Limited | Hospitality | 2025 |
| Kiki's Kitchen Ltd | Hospitality | 2025 |
| Kiko Educational Ltd | Education | 2018 |
| KIM Scales MYR Limited | Wholesale & retail | 2025 |
| KIM Wade Ltd | Health & social care | 2021 |
| Kim's Little Legendz Limited | Health & social care | 2020 |
| Kimmins Film Productions Ltd | Extraterritorial | 2022 |
| Kindavision Ltd | Manufacturing | 2020 |
| Kindlight Homecare by A&L Ltd | Health & social care | 2025 |
| Kindred Software Limited | Information & communication | 2025 |
| Kinetix Property Limited | Real estate | 2025 |
| King Flooring London Ltd | Construction | 2017 |
| Kingdom Enterprises Ltd | Wholesale & retail | 2022 |
| Kingdom of Life Academy CIC | Education | 2023 |
| Kingdom School of Arts C.I.C. | Education | 2019 |
| Kingdom Security Services Limited | Professional & scientific | 1998 |
| Kingdom Storehouse Ltd | Health & social care | 2012 |
| Kingham MTM Cases Ltd | Manufacturing | 1989 |
| Kingsley FOX Limited | Real estate | 2025 |
| Kingsley Security Services Ltd | Administrative & support | 2024 |
| Kingsman Fire and Security Limited | Administrative & support | 2022 |
| Kingsmead Mansions Freehold Limited | Households | 2005 |
| Kingston Construction Services Limited | Construction | 2023 |
| King’S House Ministries | Other services | 2017 |
| Kinli Property Ltd | Real estate | 2021 |
| Kino London Limited | Wholesale & retail | 2009 |
| Kinsman Property Lettings Ltd | Real estate | 2025 |
| Kintra Solutions Ltd. | Administrative & support | 2025 |
| Kinzay Holdings Ltd | Real estate | 2025 |
| Kipetex Ltd | Wholesale & retail | 2018 |
| KIS Advisory Ltd | Financial services | 2019 |
| KIS Arya Court Limited | Construction | 2023 |
| KIS BLB Canary Wharf Ltd | Wholesale & retail | 2026 |
| KIS Capital Ltd | Financial services | 2021 |
| KIS Electrical Ltd. | Construction | 2013 |
| KIS Homes Limited | Real estate | 2013 |
| KIS Investments Limited | Real estate | 2010 |
| KIS Ventures Ltd | Wholesale & retail | 2024 |
| KIT Carpentry & Joinery Ltd | Construction | 2020 |
| Kitchen Bespoke Furniture Ltd | Professional & scientific | 2024 |
| Kitchen Tech (London) Ltd | Manufacturing | 2019 |
| Kitta Khalopar Probashi Trust | Health & social care | 2024 |
| Kiwi Access Limited | Construction | 2019 |
| Kixk Systems Ltd | Information & communication | 2026 |
| KJ Couriers Limited | Transport & logistics | 2021 |
| KJ Smart Travel Ltd | Wholesale & retail | 2024 |
| KJS Solutions for Property Ltd | Real estate | 2026 |
| KK Auto Repair CIC | Wholesale & retail | 2026 |
| KK Builders & Construction Limited | Construction | 2026 |
| KK DRY Cleaners Ltd | Other services | 2021 |
| KK Motor Group Ltd | Wholesale & retail | 2026 |
| KK Productions Ltd | Information & communication | 2011 |
| Kklm Ltd | Construction | 2026 |
| KL Selleck Ltd | Administrative & support | 2016 |
| KLA Associates Ltd | Construction | 2023 |
| Klara Construction Ltd | Construction | 2021 |
| Klarisa Limited | Hospitality | 2025 |
| Klear Cross Group Ltd | Transport & logistics | 2018 |
| KLG Group Hendon Limited | Real estate | 2024 |
| KLG Group Holdings Limited | Construction | 2024 |
| KLG Group Intl Ltd | Construction | 2022 |
| KLG Hall Lane Limited | Construction | 2025 |
| KLG Homes Limited | Real estate | 2023 |
| KLG Surbiton Limited | Construction | 2025 |
| Kliner Global Ltd | Administrative & support | 2025 |
| Kliner Solutions Ltd | Administrative & support | 2025 |
| Klinton Tech Ltd | Wholesale & retail | 2025 |