| Khan's Removal Services Limited | Transport & logistics | 2025 |
| Khan’S Taxi Service Limited | Transport & logistics | 2025 |
| Kherut Films Ltd | Information & communication | 2012 |
| Kherut Property Ltd | Real estate | 2023 |
| KHM Fashion Ltd | Wholesale & retail | 2025 |
| Khoyer & Co Accountancy Limited | Professional & scientific | 2024 |
| Khyber Grill Essex Ltd | Hospitality | 2026 |
| Kialveez Business Services Limited | Wholesale & retail | 2019 |
| Kidicare Ltd | Health & social care | 2024 |
| Kidsbox Ltd | Wholesale & retail | 2018 |
| Kidzkandi Ltd | Wholesale & retail | 2025 |
| Kiel Computers Ltd | Administrative & support | 2024 |
| Kiirabo Limited | Health & social care | 2012 |
| Kikilicks Afro Carr Street Food Ltd | Hospitality | 2023 |
| Kimbito Ltd | Real estate | 2025 |
| Kindhaven Ltd | Extraterritorial | 2024 |
| Kingdom Investment Creation Ltd | Real estate | 2024 |
| Kingdom Pizza Limited | Hospitality | 2024 |
| Kingdom Prayer Tabernacle Limited | Other services | 2019 |
| Kinghorn Floors Limited | Construction | 2018 |
| Kings Building Co Ltd | Construction | 2021 |
| Kingsgate Londinium Business School Ltd | Education | 2024 |
| Kingsley Hall Church and Community Centre | Health & social care | 2007 |
| Kingsley Tower Crane Services Ltd | Construction | 2017 |
| Kinks POP Ltd | Wholesale & retail | 2020 |
| Kinos Ltd | Manufacturing | 2025 |
| Kinship Property Management Ltd | Real estate | 2022 |
| Kinzel Cars Limited | Wholesale & retail | 2025 |
| Kiota RAJ Limited | Construction | 2018 |
| Kioteco Limited | Wholesale & retail | 2025 |
| Kiran’S Counselling Ltd | Other services | 2026 |
| Kiritkumar Davda Limited | Transport & logistics | 2024 |
| Kirkham Construction & Maintenance Contractors Ltd | Construction | 2026 |
| Kissan Food Traders Ltd | Wholesale & retail | 2021 |
| Kisumu Healthcare Ltd | Health & social care | 2014 |
| KIT OUT Creations Ltd | Manufacturing | 2019 |
| Kivali Ltd | Arts & recreation | 2025 |
| Kiyani Logistics Limited | Wholesale & retail | 2025 |
| KK Development Group Limited | Construction | 2024 |
| KK Retailers Ltd | Wholesale & retail | 2024 |
| KKR Project Ltd | Construction | 2020 |
| KKV Consultants Limited | Real estate | 2017 |
| KL Trans Ltd | Transport & logistics | 2020 |
| Klatab Company Limited | Health & social care | 2016 |
| Kleanify Ltd | Professional & scientific | 2015 |
| Klear Clean Solutions Ltd | Administrative & support | 2011 |
| KLJ Steel Structures Limited | Construction | 2018 |
| Klub Klasyczna Polonia UK C.I.C. | Other services | 2026 |
| KM7 Electrical Services Ltd | Construction | 2014 |
| KMM Construction Ltd | Construction | 2017 |
| KMN Homes and Lettings Limited | Real estate | 2024 |
| KMP Logistics and Construction Ltd | Construction | 2021 |
| KMS New Ltd | Construction | 2025 |
| KMT London LLP | | 2023 |
| KN Retail Ltd | Wholesale & retail | 2025 |
| Kngc Limited | Other services | 2025 |
| Kngsmr Limited | Professional & scientific | 2026 |
| Knight's Hill Interiors Ltd | Construction | 2015 |
| Knowledge 2 Wealth Ltd | Real estate | 2020 |
| Knowledge County Childcare Ltd | Health & social care | 2016 |
| Knowledge County Tuition Ltd | Education | 2014 |
| KNS PCO Hire Ltd | Administrative & support | 2026 |
| Koch London Ltd | Wholesale & retail | 2017 |
| Kofdee Investment Ltd | Wholesale & retail | 2011 |
| Kohinoor Kitchen Ltd | Hospitality | 2026 |
| Kohinur Global Ltd | Wholesale & retail | 2021 |
| Koko Solutions Ltd | Construction | 2025 |
| Komol Track UK Ltd | Professional & scientific | 2015 |
| KON Threads Ltd | Wholesale & retail | 2025 |
| Konad Company Limited | Transport & logistics | 2019 |
| Konni K'S Limited | Hospitality | 2025 |
| Konnii Limited | Information & communication | 2014 |
| Konu and Co Ltd | Transport & logistics | 2022 |
| Konzel Limited | Construction | 2023 |
| Kosta Volkov Ltd | Professional & scientific | 2025 |
| Kosto Traditional Food Ltd | Manufacturing | 2022 |
| Kotama Ltd | Construction | 2022 |
| Koyo Holdings Ltd | Information & communication | 2024 |
| KPR Builders Ltd | Construction | 2026 |
| KQN Retail Limited | Wholesale & retail | 2024 |
| KR Assets Ltd | Real estate | 2026 |
| KR13 Ltd | Wholesale & retail | 2024 |
| Kraken 67 Ltd | Transport & logistics | 2024 |
| Krasimir Construction Limited | Construction | 2017 |
| Kravins Limited | Hospitality | 2014 |
| KRD Engineering Services Ltd | Manufacturing | 2026 |
| Krealant Ltd | Wholesale & retail | 2012 |
| Krisac Engineering Ltd | Professional & scientific | 2019 |
| Krishna Property Service Limited | Real estate | 2024 |
| Krisore Services Limited | Transport & logistics | 2014 |
| Kriss Construct Ltd | Construction | 2022 |
| Kriss Design&Build Ltd | Construction | 2019 |
| Kristin Ltd | Transport & logistics | 2020 |
| Krochique Ltd | Wholesale & retail | 2020 |
| Krov Ltd | Wholesale & retail | 2024 |
| Krsa Legacy Limited | Financial services | 2025 |
| Krypton Digital Ltd | Information & communication | 2025 |
| Krypton Training Limited | Professional & scientific | 2007 |
| Krystal Ellis Ltd | Professional & scientific | 2019 |
| Kryvion Solutions Ltd | Administrative & support | 2026 |