| Keys 4 Independence Dorset Ltd | Real estate | 2017 |
| KGB Corporation LLP | | 2013 |
| Kgl&B Properties Ltd | Real estate | 2024 |
| Khan Digital Marketing Services Ltd | Wholesale & retail | 2025 |
| Khmj Ltd | Financial services | 2025 |
| Khong Ethereal Limited | Hospitality | 2009 |
| KI8 Ltd | Real estate | 2023 |
| Kickdrum Partners Ltd | Professional & scientific | 2024 |
| Kilic Fashion Limited | Wholesale & retail | 2013 |
| Killams Park (Taunton) Management Company Limited | Households | 2017 |
| Killaworgey Farm Limited | Hospitality | 2022 |
| Kilpatricks (SW) Ltd | Construction | 2018 |
| Kimmunicateplus Limited | Administrative & support | 2015 |
| Kimsey Consulting Limited | Professional & scientific | 2011 |
| Kinetix Events Limited | Administrative & support | 2005 |
| King's College Schools International Limited | Education | 2015 |
| Kingfisher Resorts ST Ives Limited | Hospitality | 2016 |
| Kingfisher Tree Services Ltd | Agriculture & fishing | 2020 |
| Kings Chapel Management Limited | Households | 2025 |
| Kings Court Residents Management Limited | Households | 2002 |
| Kings Cycles Limited | Wholesale & retail | 2003 |
| Kings Metal Engineering Ltd | Construction | 2026 |
| Kings Square Properties Ltd | Real estate | 2021 |
| Kingscourt Meadow 2 (Gillingham) Management Company Limited | Households | 2005 |
| Kingsdon and Kingweston Shoot Limited | Arts & recreation | 2017 |
| Kingsgate Investment Ltd | Real estate | 2021 |
| Kingsgate Properties Limited | Real estate | 2002 |
| Kingsland Farm Partnership Limited | Agriculture & fishing | 1997 |
| Kingsleigh Homes Limited | Construction | 2019 |
| Kingsmead Academy | Education | 2011 |
| Kingston Road Properties Ltd | Real estate | 2022 |
| Kingston Road TA2 Ltd | Real estate | 2024 |
| Kingstons Flats Management Limited | Households | 1990 |
| Kingtrade Ltd. | Professional & scientific | 2000 |
| Kintbury Holt Ltd | Agriculture & fishing | 2013 |
| Kira&Tino E-Commerce Ltd | Wholesale & retail | 2025 |
| Kirkham Healthcare Limited | Health & social care | 2014 |
| Kitchens & Updates Limited | Wholesale & retail | 2012 |
| Kitching Associates Limited | Professional & scientific | 2020 |
| Kiwi Lincs Limited | Other services | 2016 |
| Kixx Plymouth Ltd | Education | 2020 |
| Kizmet Consortium Ltd | Administrative & support | 2015 |
| KJ Reynolds (Somerset) Limited | Transport & logistics | 2004 |
| KL5 Logistics Ltd | Transport & logistics | 2025 |
| Klaassen Property Ltd | Real estate | 2025 |
| Klaus-Carter Consultancy Limited | Administrative & support | 2015 |
| Kleijsen, Cortenbach & Kuijpers LLP | | 2009 |
| Klip Limited | Information & communication | 2023 |
| Kloer Ltd | Wholesale & retail | 2024 |
| KMD Marlow Limited | Wholesale & retail | 2014 |
| KME Financial Planning Limited | Financial services | 2020 |
| KME Specialist Recruitment Consultants Limited | Administrative & support | 2017 |
| KML Reporting Limited | Health & social care | 2018 |
| KMR Enterprise BD Ltd | Wholesale & retail | 2026 |
| Kmre Limited | Real estate | 2026 |
| KMS Associates Europe Ltd | Real estate | 2000 |
| Kmswz Distributions Ltd | Wholesale & retail | 2025 |
| Kmthomson Consulting Ltd | Information & communication | 2018 |
| Knaplock Limited | Agriculture & fishing | 2008 |
| Knapp Energy Limited | Manufacturing | 2023 |
| Knapp Farm Holdings Ltd | Financial services | 2024 |
| Knapp Lane Acre Ltd | Construction | 2014 |
| Knatt Limited | Administrative & support | 2023 |
| Knight Brothers Limited | Wholesale & retail | 2012 |
| Knight Brothers Travel Ltd | Transport & logistics | 2006 |
| Knights Barton Investments Ltd | Real estate | 2026 |
| Knowledgeable Reflections Ltd | Professional & scientific | 2022 |
| KO Motors Ltd | Wholesale & retail | 2025 |
| Kohler-Cadmore Properties Ltd | Real estate | 2020 |
| Komplex Limited | Construction | 2016 |
| Konnect (Taunton) Limited | Wholesale & retail | 2002 |
| Kordtards Limited | Real estate | 2020 |
| Kpax Infiniti Limited | Wholesale & retail | 2025 |
| KPL Services Limited | Construction | 2018 |
| Krackers Toys and Games Limited | Wholesale & retail | 2015 |
| Kraken Cleaning Limited | Administrative & support | 2022 |
| Kraken Plumbing Ltd | Construction | 2025 |
| Kratos Sport Limited | Wholesale & retail | 2020 |
| Kray Limited | Wholesale & retail | 2024 |
| KRF Automotive Limited | Wholesale & retail | 2020 |
| Krishva Ltd | Wholesale & retail | 2023 |
| KRP Business Consultancy Ltd | Other services | 2017 |
| KRR Estates Ltd | Real estate | 2026 |
| KS Property Sourcing Ltd | Real estate | 2024 |
| KS Veterinary Limited | Financial services | 2026 |
| KSL Logistics Ltd | Transport & logistics | 2018 |
| KT Goods Ltd | Wholesale & retail | 2024 |
| KT Richards Ltd | Wholesale & retail | 2021 |
| Kudos Housewares Limited | Wholesale & retail | 2014 |
| Kukunda Group Limited | Administrative & support | 2014 |
| Kurdish Barber Taunton Ltd | Other services | 2025 |
| Kutchenhaus Taunton Ltd | Wholesale & retail | 2019 |
| KW Gordon Ltd | Hospitality | 2021 |
| Kwik Stop Limited | Wholesale & retail | 2003 |
| Kwikchex Limited | Information & communication | 2010 |
| KXA Enterprises Limited | Financial services | 2025 |
| L & B Fabrication Limited | Construction | 2016 |
| L & J Property SW Limited | Real estate | 2026 |
| L & S Tradings Ltd | Real estate | 2023 |
| L a Roadhouse Limited | Construction | 2003 |