| Just Build Technology Ltd | Information & communication | 2024 |
| Just Build Technology White Label Ltd | Information & communication | 2026 |
| Just for Consortium Ltd | Wholesale & retail | 2025 |
| Just in Time Driver Ltd | Transport & logistics | 2016 |
| Just Kidding Holmes Chapel Limited | Administrative & support | 2018 |
| Just Roofs North West Ltd | Construction | 2026 |
| JW Access (Cheshire) Ltd | Construction | 2021 |
| JW Paint Refinishing Limited | Wholesale & retail | 2019 |
| JWC Fitness Ltd | Health & social care | 2017 |
| JWC Health & Fitness Ltd | Health & social care | 2015 |
| JWF Solutions Ltd | Professional & scientific | 2025 |
| JWL Advisory Services LLP | | 2025 |
| JWM Security Industry Limited | Administrative & support | 2024 |
| JY Products Ltd | Construction | 2024 |
| K & K Medical Limited | Health & social care | 2023 |
| K & K Property Management, Maintenance, Services Ltd | Real estate | 2025 |
| K & W Properties Limited | Real estate | 2026 |
| K & W Property Ltd | Real estate | 2026 |
| K J B Builders Limited | Professional & scientific | 2007 |
| K P W Engineering Limited | Professional & scientific | 2007 |
| K Property Cheshire Limited | Real estate | 2025 |
| K R Yoxall Limited | Information & communication | 2010 |
| K&Jay Group Logistics Ltd | Transport & logistics | 2022 |
| K&K Beauty and Healthy Limited | Wholesale & retail | 2024 |
| K1NG Business Limited | Wholesale & retail | 2019 |
| K9 Bathtime Limited | Other services | 2003 |
| Kachaka Ltd | Transport & logistics | 2025 |
| Kage Systems Ltd. | Information & communication | 2012 |
| Kainon Limited | Manufacturing | 2015 |
| Kalar KON Ltd | Wholesale & retail | 2023 |
| Kalb Ltd | Real estate | 2022 |
| Kandu Services Ltd | Transport & logistics | 2024 |
| Kanya Property Limited | Other services | 2022 |
| Kanyaz Group Ltd | Wholesale & retail | 2023 |
| Kapler Communications Limited | Professional & scientific | 2001 |
| Kapshoo Limited | Information & communication | 2021 |
| KAR Property Developments Ltd | Construction | 2025 |
| Karlmunroe Limited | Other services | 2014 |
| Karmaesthetics Ltd | Health & social care | 2017 |
| Kartol Global Limited | Wholesale & retail | 2024 |
| Kasa Private Consultancy Ltd | Professional & scientific | 2025 |
| Kash IS Best Limited | Extraterritorial | 2014 |
| Katharos HR Ltd | Professional & scientific | 2025 |
| Katherine Pagett Ltd | Health & social care | 2017 |
| Katuzi Group UK | Financial services | 2019 |
| Kayglobal Multisector Limited | Real estate | 2025 |
| Kayz Sparkle Clean Ltd | Administrative & support | 2025 |
| Kazachtrans Ltd | Transport & logistics | 2024 |
| Kazoora Properties Ltd | Real estate | 2026 |
| KB Signall Ltd | Construction | 2025 |
| KC Building Ltd | Construction | 2025 |
| KD Finance Consulting Ltd | Professional & scientific | 2026 |
| KDL Construction Limited | Construction | 2006 |
| KDM Hair Limited | Other services | 2014 |
| KDP Property Developments Ltd | Real estate | 2024 |
| KEB Property Consultant Ltd | Real estate | 2024 |
| Keebro Holdings Ltd | Administrative & support | 2018 |
| Keeling’S Transport Ltd | Transport & logistics | 2025 |
| Kel-Ceci Maduekwe Medicals Ltd | Health & social care | 2023 |
| Kell Consulting Ltd. | Professional & scientific | 2014 |
| Kellitcreed Showdogs Limited | Agriculture & fishing | 2024 |
| Kellsworth Ltd | Real estate | 2026 |
| Kemkash Services Limited | Arts & recreation | 2017 |
| Kenda Manufacturing GB Limited | Manufacturing | 2003 |
| Kennel Build Ltd | Manufacturing | 2012 |
| Kent EBT Limited | Financial services | 2016 |
| Kents Green Management Limited | Extraterritorial | 2013 |
| Kenvale Computing Ltd | Information & communication | 2013 |
| Kepstorn Developments Ltd | Real estate | 2024 |
| Kerala Flavours Limited | Hospitality | 2024 |
| Kerala Peppery Limited | Hospitality | 2024 |
| Kerem Limited | Hospitality | 2025 |
| Kerridge Property Management Ltd | Real estate | 2023 |
| Kerry Walker Copywriting Ltd | Professional & scientific | 2005 |
| Kesko Ltd | Information & communication | 2014 |
| Kettlewell & Jones Ltd | Other services | 2020 |
| Key Telematics UK Ltd | Information & communication | 2011 |
| Keystone Developments & Investments Limited | Real estate | 2024 |
| KF Harding Properties Ltd | Real estate | 2026 |
| KFH Accounts Limited | Professional & scientific | 2015 |
| KFH Network Limited | Administrative & support | 2017 |
| KFH Training Limited | Administrative & support | 2017 |
| KGP Consulting Limited | Professional & scientific | 2023 |
| Khalion Ltd | Manufacturing | 2023 |
| Khayyam Enterprises Ltd | Wholesale & retail | 2025 |
| Khorsandi Properties Limited | Real estate | 2025 |
| Kibaba & Son’S Limited | Health & social care | 2025 |
| Kimera Capital Holdings Limited | Real estate | 2020 |
| KIN Rituals Limited | Wholesale & retail | 2026 |
| Kincaid Aero Ltd | Manufacturing | 2026 |
| Kinclaims Technology Limited | Information & communication | 2024 |
| Kindertons 2013 Limited | Professional & scientific | 2013 |
| Kindertons Holdings Limited | Administrative & support | 2005 |
| Kindertons Investments Ltd | Administrative & support | 2025 |
| Kindertons Limited | Administrative & support | 1999 |
| Kindertons Topco Limited | Administrative & support | 2013 |
| Kingfisher Global Consulting Limited | Administrative & support | 2025 |
| Kingpin Security Ltd | Administrative & support | 2023 |
| Kingsdown Sport Limited | Other services | 2019 |
| Kingsmead Consultants Ltd | Professional & scientific | 2015 |