| Kgno Ltd | Professional & scientific | 2024 |
| Kgookeyproperties Ltd | Real estate | 2024 |
| Kgsz Property Ltd | Real estate | 2024 |
| KH Improvements Ltd | Construction | 2019 |
| Khagram Consulting Limited | Information & communication | 2025 |
| Khagram Investments Ltd | Real estate | 2022 |
| Khandan Restaurant Ltd | Hospitality | 2023 |
| Khiljee Ltd | Wholesale & retail | 2025 |
| Khmer Ocean Life | Agriculture & fishing | 2023 |
| Kids Gift Box Ltd | Wholesale & retail | 2020 |
| Kids in Style Limited | Wholesale & retail | 2011 |
| Kilborn Consulting Limited | Professional & scientific | 2000 |
| Kilby Motors Limited | Wholesale & retail | 1999 |
| Kildun Construction Limited | Construction | 2013 |
| Kildun Homes Limited | Real estate | 2017 |
| Kilgarvan Holdings Limited | Real estate | 2020 |
| Kilkos Ltd | Hospitality | 2025 |
| Kilshaw Consulting Ltd | Wholesale & retail | 2022 |
| Kindlight Care Ltd | Health & social care | 2025 |
| Kinemara Ltd | Hospitality | 2023 |
| Kinetec International Ltd | Manufacturing | 2014 |
| Kinetec Medical Products UK Limited | Manufacturing | 2015 |
| Kinetica Concepts Limited | Administrative & support | 2012 |
| King Entertainment Ltd | Information & communication | 2022 |
| Kingham / Hanji GDS Contract Limited Partnership | | 2011 |
| Kingsthorpe Grove Developments Limited | Construction | 2024 |
| Kingston Carpets & Beds Limited | Wholesale & retail | 2025 |
| Kingsway Holdings Ltd | Real estate | 2017 |
| Kintsukuroi - the Golden Repair Therapy Limited | Health & social care | 2024 |
| Kioma Records Limited | Arts & recreation | 2019 |
| KIP Mcgrath Wellingborough LP | | 2026 |
| Kishkrin Ltd | Professional & scientific | 2016 |
| Kiszlo Ltd | Administrative & support | 2023 |
| Kita Projects Ltd | Real estate | 2021 |
| Kitchenductclean Ltd | Administrative & support | 2013 |
| KJ POL Limited | Transport & logistics | 2017 |
| Klarek Ltd | Transport & logistics | 2017 |
| KLP Auto Group Ltd | Wholesale & retail | 2026 |
| Kman Inn Limited | Hospitality | 2026 |
| KNC Couriers Ltd | Transport & logistics | 2025 |
| Knox Road Management Limited | Real estate | 2004 |
| KNP Logistic Solutions Limited | Wholesale & retail | 2015 |
| KNZ Transport Ltd | Transport & logistics | 2022 |
| Kobak Automation Ltd | Professional & scientific | 2018 |
| Kobe Logistics Ltd | Transport & logistics | 2014 |
| Kokomatic Limited | Professional & scientific | 2017 |
| Kompak Limited | Wholesale & retail | 2018 |
| Konecht Ltd | Transport & logistics | 2024 |
| Kooka Construction Limited | Construction | 2024 |
| Kooka Developments Ltd | Construction | 2019 |
| Kooka Group Ltd | Administrative & support | 2024 |
| Kooka Renewables Limited | Manufacturing | 2024 |
| Kornelia Trans Ltd | Transport & logistics | 2013 |
| Kosmic Limited | Education | 2013 |
| Kotecha Consultancy Ltd | Information & communication | 2019 |
| Koten Barbers Ltd | Administrative & support | 2019 |
| Kozha Ltd | Wholesale & retail | 2026 |
| KP Estates & Lettings Limited | Real estate | 2025 |
| Kp-Pps Consulting Ltd | Professional & scientific | 2021 |
| KPH Logistics Ltd | Transport & logistics | 2026 |
| KPM Analytics Ltd | Manufacturing | 2001 |
| Kprj Limited | Financial services | 2025 |
| KR Distribution Limited | Wholesale & retail | 2026 |
| KRAF79 Ltd | Construction | 2014 |
| Kranserv Limited | Administrative & support | 2018 |
| Krany Limited | Professional & scientific | 2013 |
| KRG Healthcare Limited | Health & social care | 2010 |
| KRG Lettings Limited | Real estate | 2019 |
| Krinkish Ltd | Real estate | 2018 |
| Krismart Ltd | Transport & logistics | 2015 |
| Krividem Ltd | Manufacturing | 2025 |
| Krohne Limited | Manufacturing | 1976 |
| Krss Limited | Manufacturing | 2007 |
| Krumblelane Ltd | Wholesale & retail | 2026 |
| Krystal Clear Cleaners Ltd | Administrative & support | 2024 |
| Krzysztof Cars Limited | Administrative & support | 2016 |
| KS Auto Electrical Ltd | Wholesale & retail | 2026 |
| KS Merchants Ltd | Wholesale & retail | 2025 |
| KS Pro Limited | Construction | 2023 |
| Ksaw-Mat Group Ltd | Wholesale & retail | 2022 |
| Kshetra Ltd | Real estate | 2026 |
| Kshetrix Ltd | Wholesale & retail | 2026 |
| KSS Trading Limited | Real estate | 2021 |
| KT Sign and Graphic Installations Ltd | Construction | 2013 |
| KTF Housing (UK) Limited | Construction | 2020 |
| KTP Security Ltd | Wholesale & retail | 2022 |
| Kubus Retail Limited | Wholesale & retail | 2025 |
| Kudakwaishe Ltd. | Other services | 2013 |
| Kudos Automation Limited | Professional & scientific | 2017 |
| Kudos Conveyancing Ltd | Professional & scientific | 2018 |
| Kumaran Traders Ltd | Wholesale & retail | 2019 |
| Kuntacare Limited | Health & social care | 2021 |
| Kushan Logistics Ltd | Transport & logistics | 2024 |
| KWS Security Ltd | Administrative & support | 2019 |
| Kyky Limited | Transport & logistics | 2019 |
| Kyson Roofing Supplies Limited | Construction | 2013 |
| Kyzer Limited | Real estate | 2020 |
| KZS Limited | Professional & scientific | 2006 |
| L & J Rigging Limited | Information & communication | 2015 |
| L & P Elite Roofing Ltd | Construction | 2018 |