| KC Balti Ltd | Hospitality | 2024 |
| KC Finance Limited | Financial services | 2024 |
| Kebab Village Express Ltd | Hospitality | 2025 |
| Kelly Mayers Optical Ltd | Professional & scientific | 2023 |
| Kena Children Services Ltd | Health & social care | 2025 |
| Kendo Property Ltd | Real estate | 2025 |
| Kenect Franchising Limited | Administrative & support | 2023 |
| Kenect Group Holdings Limited | Professional & scientific | 2023 |
| Kenect Recruitment (Industrial) Limited | Administrative & support | 2021 |
| Kenect Recruitment Group Limited | Wholesale & retail | 2017 |
| Kenect Recruitment Ltd | Administrative & support | 2012 |
| Kengz Barber Ltd | Other services | 2024 |
| Kensington Asset Sales Limited | Wholesale & retail | 2015 |
| Kent Airport Transfers Ltd | Transport & logistics | 2019 |
| Kesar Events & Catering Limited | Administrative & support | 2013 |
| Key & Nest Properties Ltd | Construction | 2025 |
| Keylight Media Ltd | Information & communication | 2011 |
| KG Storage Ltd | Transport & logistics | 2023 |
| Khans Practice Ltd | Wholesale & retail | 2023 |
| Kianis Ltd | Financial services | 2012 |
| Kianis Properties Ltd | Real estate | 2024 |
| Kias Services Limited | Administrative & support | 2015 |
| Kibble Electrical Ltd | Construction | 2026 |
| Kidz Rugby Limited | Arts & recreation | 2013 |
| Kieren Brown Transport Planning Limited | Professional & scientific | 2017 |
| Kiku Burton Limited | Hospitality | 2021 |
| Kilkenny Lettings Limited | Real estate | 2014 |
| Killick Medical Services Ltd | Health & social care | 2025 |
| Kimberley's of Rangemore Limited | Manufacturing | 2015 |
| Kind Shop Limited | Other services | 2023 |
| Kindacare (U.K.) Limited | Professional & scientific | 2009 |
| Kinesys Consulting Limited | Professional & scientific | 2007 |
| King Street MOT Centre Ltd | Wholesale & retail | 2024 |
| Kingdom Protection Group Ltd | Administrative & support | 2026 |
| Kings Test Centre Ltd | Wholesale & retail | 2024 |
| Kingsgate Developments (Midlands) Limited | Real estate | 2021 |
| Kingstanding Developments Limited | Construction | 2013 |
| Kingstanding Renovations Limited | Extraterritorial | 2024 |
| Kipro UI Ltd | Information & communication | 2025 |
| Kirk House Ltd | Real estate | 2020 |
| Kiroex Ltd | Information & communication | 2026 |
| Kitt Properties Limited | Real estate | 2001 |
| KJR Holdings Ltd | Professional & scientific | 2022 |
| KJS Global Ltd | Professional & scientific | 2020 |
| KK + Plus Limited | Administrative & support | 2003 |
| KK Logistics Ltd | Extraterritorial | 2016 |
| Klavini Labs Ltd | Information & communication | 2025 |
| KLB Roofing Limited | Construction | 2021 |
| Klcr Ltd | Transport & logistics | 2025 |
| KLEEN2GLEAM Ltd | Administrative & support | 2018 |
| KLM Equine Services Ltd | Arts & recreation | 2019 |
| KLW Cleaning & Ironing Services Limited | Other services | 2012 |
| KM Associates Ltd | Hospitality | 2025 |
| KM Caci Clinic Limited | Other services | 2018 |
| KM Studios Limited | Manufacturing | 2010 |
| KMS Traders Ltd | Wholesale & retail | 2025 |
| Kn's Businesses Ltd | Hospitality | 2024 |
| Knight Dutton Ltd | Construction | 2025 |
| Knightford Limited | Construction | 2019 |
| Knighton Lettings Limited | Real estate | 2023 |
| Knighton Properties Ltd | Real estate | 2019 |
| Knights Bridge Solutions Ltd | Professional & scientific | 2013 |
| Knights Energy Ltd | Construction | 2023 |
| Knights Lodges of Bretby Limited | Real estate | 2018 |
| Knights Place (Burton) Limited | Households | 2022 |
| Knightsbridge Mining Solutions Ltd | Professional & scientific | 2024 |
| Knowledge Plus Consultancy Limited | Professional & scientific | 2003 |
| KOG Solutions Ltd | Professional & scientific | 2023 |
| Kolber Oak Properties Limited | Households | 2019 |
| Kompas Transport Ltd | Transport & logistics | 2017 |
| Kontri Ltd | Wholesale & retail | 2013 |
| KP Anaesthetics Ltd | Health & social care | 2021 |
| KP Executive Chauffeur Ltd | Transport & logistics | 2026 |
| KP Star Drivers Ltd | Hospitality | 2019 |
| KPP Support Services Ltd | Transport & logistics | 2021 |
| KR SPV 002 Limited | Real estate | 2021 |
| KR7 Ltd | Transport & logistics | 2026 |
| Krakov Limited | Wholesale & retail | 2025 |
| Krasnal Limited | Transport & logistics | 2018 |
| KRH Traders Ltd | Wholesale & retail | 2025 |
| Kris Paint Finish Ltd | Manufacturing | 2013 |
| Krismal Ltd | Information & communication | 2024 |
| Kriss Transport Ltd | Transport & logistics | 2017 |
| Krss Sultan Bangla Ltd | Hospitality | 2023 |
| Kruk Ltd | Transport & logistics | 2025 |
| Krux Klean Ltd | Administrative & support | 2024 |
| Kryo Science Limited | Professional & scientific | 2012 |
| Krzysztof Rusin Ltd | Transport & logistics | 2014 |
| Krzysztof Warchol Limited | Transport & logistics | 2012 |
| KS Electrical Contractors Ltd | Construction | 2024 |
| Ks's Accounting and Tax Ltd | Professional & scientific | 2024 |
| Kubus Market 2026 Limited | Wholesale & retail | 2026 |
| Kubus Mini Ltd | Wholesale & retail | 2026 |
| Kumba Cares Ltd | Health & social care | 2024 |
| KW Packaging Limited | Wholesale & retail | 2013 |
| Kyozen Mouldings Ltd | Manufacturing | 2007 |
| Kyvi Ltd | Transport & logistics | 2026 |
| L & C Pubs Limited | Hospitality | 2025 |
| L and C Care Ltd | Health & social care | 2024 |
| L Bult Ltd | Information & communication | 2021 |