| Khullar Holdings Limited | Real estate | 2019 |
| Khurd Services Ltd | Transport & logistics | 2025 |
| Khushi Telecom Limited | Wholesale & retail | 2021 |
| Khusiya Limited | Wholesale & retail | 2016 |
| Khyati Dream Homes Limited | Real estate | 2017 |
| Khyber Group Limited | Hospitality | 2026 |
| Khyber Shinwari Ltd | Hospitality | 2025 |
| KI & LA Assets Ltd | Real estate | 2025 |
| Kian-Daya Ltd | Wholesale & retail | 2026 |
| Kiana Gardens Inn Ltd | Health & social care | 2023 |
| Kianara Holdings Ltd | Financial services | 2026 |
| Kiara SS Ltd | Transport & logistics | 2024 |
| Kickfit Academy LLP | | 2009 |
| Kickfit Caversham LLP | | 2016 |
| Kickfit Consult Ltd | Professional & scientific | 2019 |
| Kickfit Langley LLP | | 2020 |
| Kickfit Martial Arts LLP | | 2020 |
| Kickfit Martial Arts Schools Limited | Arts & recreation | 2004 |
| Kickfit RWW LLP | | 2025 |
| KID & Play Ltd | Administrative & support | 2016 |
| KID the Cat Ltd | Information & communication | 2013 |
| Kiddies Heaven Limited | Wholesale & retail | 2021 |
| Kidoover Ltd | Manufacturing | 2024 |
| Kidwise After School and Summer Camp Ltd | Health & social care | 2022 |
| Kiingdem Ltd | Wholesale & retail | 2025 |
| Kikatek Limited | Wholesale & retail | 2006 |
| Kilban Ltd | Wholesale & retail | 2021 |
| Kilby Holdings Ltd | Real estate | 2025 |
| Kili Arts Ltd | Arts & recreation | 2014 |
| Kilkenny Ventures Limited | Financial services | 2025 |
| Killa Studios Ltd | Professional & scientific | 2020 |
| Killin Media Ltd | Professional & scientific | 2021 |
| Kilmoney Construction Limited | Construction | 2015 |
| Kilnwood Park Polo Limited | Agriculture & fishing | 2025 |
| Kilton Ltd | Wholesale & retail | 2022 |
| Kimi Designs Limited | Construction | 2019 |
| Kimik Ltd | Wholesale & retail | 2020 |
| Kinari Ltd | Real estate | 2025 |
| Kind Haven Care Ltd | Health & social care | 2024 |
| Kindbridge Health Care Ltd | Health & social care | 2025 |
| Kindi AI Consultancy Limited | Information & communication | 2026 |
| Kindness & Care Home Limited | Health & social care | 2023 |
| Kinetic Advance Ltd | Administrative & support | 2011 |
| Kinetic Enhance Limited | Administrative & support | 2014 |
| Kinetic Marketing & Design Limited | Professional & scientific | 2007 |
| King Construction Group Ltd | Construction | 2025 |
| King Edward Street (NO 14) Slough Management Company Limited | Households | 1994 |
| King John's Palace (Residents Association) Limited | Households | 1970 |
| King Renovations Ltd | Construction | 2015 |
| King Solomon Consulting Limited | Administrative & support | 2024 |
| Kingdom Glazing Ltd | Construction | 2022 |
| Kingdom Property Services Ltd | Wholesale & retail | 2016 |
| Kingfisher Hospitality Ltd | Real estate | 2022 |
| Kingsley Global Ltd | Professional & scientific | 2024 |
| Kingsley Kumar Limited | Information & communication | 2018 |
| Kingsmead Care Home Limited | Health & social care | 2013 |
| Kingsoaks Technology and Transportation Limited | Information & communication | 2021 |
| Kingston Osadolor Oboh Limited | Extraterritorial | 2026 |
| Kingston Osaoboh Oboh Ltd | Extraterritorial | 2025 |
| Kingston Wells Limited | Professional & scientific | 2020 |
| Kingsway Real Estate Ltd | Construction | 2023 |
| Kinh Nguyen Limited | Real estate | 2025 |
| Kinjoy Ltd | Health & social care | 2010 |
| Kintetsu World Express (U.K.) Limited | Transport & logistics | 1985 |
| Kinzy Limited | Real estate | 2024 |
| Kioskiq Ltd | Information & communication | 2025 |
| KIP Brothers Ltd | Real estate | 2022 |
| KIP Mcgrath Slough Ltd | Education | 2025 |
| Kiran Ubhi Ltd | Professional & scientific | 2025 |
| Kirat Ltd | Other services | 2023 |
| Kirpa Homes Ltd | Real estate | 2025 |
| Kisaan Superstore Ltd | Wholesale & retail | 2024 |
| Kishwaz International Limited | Wholesale & retail | 2026 |
| KIT Solutions Limited | Information & communication | 2014 |
| Kitchener Project Ltd | Real estate | 2025 |
| Kite Bidco Ltd | Financial services | 2018 |
| Kite Midco II Ltd | Financial services | 2018 |
| Kite Midco Ltd | Financial services | 2018 |
| Kite Topco Ltd | Financial services | 2018 |
| Kitt Services Ltd | Construction | 2022 |
| Kitty&Kobe Limited | Other services | 2022 |
| Kivaraa Ltd | Wholesale & retail | 2025 |
| Kiventa Holdings Ltd | Financial services | 2026 |
| Kivi Investments Ltd | Real estate | 2021 |
| Kiya Limited | Information & communication | 2013 |
| KJ Chadbone Roofing LLP | | 2018 |
| KJ Smile Clinics Ltd | Health & social care | 2025 |
| KJ Vastu Coventry Ltd | Real estate | 2020 |
| KJB Civil Engineering Ltd | Construction | 2008 |
| KJK Group Ltd | Real estate | 2023 |
| KK Chauffeur Ltd | Transport & logistics | 2026 |
| KK Consulting Ltd | Information & communication | 2017 |
| KK Croydon Limited | Construction | 2023 |
| KK Groundwork's Ltd | Construction | 2022 |
| KK Kitchen and Bedrooms Ltd | Construction | 2026 |
| KK National Ltd | Education | 2024 |
| Kk's Cars Traders Ltd | Wholesale & retail | 2024 |
| KK93 CIC | Transport & logistics | 2020 |
| KKC Coaches Ltd | Transport & logistics | 2025 |
| KKD Holdings Limited | Construction | 2020 |