| Kalinda Property Ltd | Real estate | 2024 |
| Kalitoda Information Technology and Data Services Limited | Information & communication | 2025 |
| Kall Fit Autocentre Ltd | Wholesale & retail | 2020 |
| Kalri Brothers Limited | Wholesale & retail | 2024 |
| Kalua Medical Equipment Limited | Professional & scientific | 2006 |
| KAM Auto Services Limited | Transport & logistics | 2007 |
| Kamado Kitchen Limited | Manufacturing | 2024 |
| Kamash Enterprise Ltd | Health & social care | 2022 |
| Kamcarihouse Ltd | Real estate | 2024 |
| Kamexport Ltd | Wholesale & retail | 2016 |
| Kami Budd Events LLP | | 2026 |
| Kamtony Ltd | Transport & logistics | 2017 |
| KAN Estate Ltd | Real estate | 2025 |
| KAN Property Holding Ltd | Real estate | 2025 |
| Kannan World Technology Limited | Information & communication | 2019 |
| Kansal Group Limited | Real estate | 2020 |
| Kansal Holding Limited | Real estate | 2024 |
| Kapatad Ltd | Health & social care | 2016 |
| Karam Dhaliwal QCS Limited | Professional & scientific | 2013 |
| Kareland Ltd | Real estate | 2020 |
| Karim Agaii Ltd | Transport & logistics | 2023 |
| Karim Laundrette Ltd | Other services | 2016 |
| Karkuk Barber Limited | Other services | 2024 |
| Karma Marketing Ltd | Administrative & support | 2025 |
| Karoliina Saunders Hair Design Limited | Other services | 2015 |
| Karon Accounting Services Limited | Professional & scientific | 2014 |
| Kartex Ltd | Transport & logistics | 2018 |
| Kary Bumble Cleaning Services Ltd | Administrative & support | 2024 |
| Kary Bumble Ltd | Wholesale & retail | 2019 |
| KAS Pharma Limited | Professional & scientific | 2012 |
| Kasc Group Limited | Wholesale & retail | 2023 |
| Kasilo Ltd | Professional & scientific | 2022 |
| KAT Morgan Studio Limited | Arts & recreation | 2020 |
| Katakara Ltd | Wholesale & retail | 2023 |
| Kate Keane Consultancy Limited | Professional & scientific | 2022 |
| Kate Lorraine Consultancy Ltd | Professional & scientific | 2022 |
| Kate Morton Limited | Other services | 2012 |
| Kateson Beauty Centre Limited | Other services | 2010 |
| Kathryn Tyler Health and Care Services Limited | Health & social care | 2021 |
| Kaur Homes Limited | Real estate | 2024 |
| Kavali Saxon Ltd | Hospitality | 2025 |
| Kavinila Ltd | Wholesale & retail | 2019 |
| KAW Supplies Limited | Wholesale & retail | 2020 |
| KAY Plumbing Solutions Ltd | Construction | 2021 |
| Kaye Services Ltd | Wholesale & retail | 2026 |
| Kayocorps Limited | Health & social care | 2013 |
| Kays Beauty Ltd | Other services | 2018 |
| Kaytec Services Ltd | Administrative & support | 2018 |
| Kazoo Ltd | Transport & logistics | 2022 |
| KB Educational Consulting Ltd | Other services | 2024 |
| KB Training & Security Services Limited | Administrative & support | 2015 |
| KBC Tech. Services (KTS) Limited | Information & communication | 2017 |
| Kbcengineering Services Ltd | Manufacturing | 2024 |
| KBL Consulting Limited | Administrative & support | 2015 |
| KC QAT Services Limited | Information & communication | 2020 |
| KC Swindon Ltd | Hospitality | 2022 |
| KCJ Care and Wellbeing Ltd | Administrative & support | 2019 |
| KCM Electrical Engineering Ltd | Manufacturing | 2018 |
| KCS Property Developments Ltd | Construction | 2018 |
| Kcsc Electrical Ltd | Construction | 2022 |
| KD Commercial Group Ltd | Administrative & support | 2026 |
| KDM Swindon Limited | Manufacturing | 2026 |
| Kdml Consulting Limited | Administrative & support | 2008 |
| KDS Groundworks & Construction Ltd | Construction | 2006 |
| Kdtps Ltd | Construction | 2025 |
| KEC Consulting Ltd | Manufacturing | 2018 |
| Kedur Ltd | Manufacturing | 2022 |
| Keech and Keech Investments Ltd | Real estate | 2021 |
| Keep on Trading Limited | Health & social care | 2015 |
| Keep Place Limited | Wholesale & retail | 2026 |
| Keeper Walpole Holdings Limited | Financial services | 2021 |
| Keepers Cottage Executive Coaching Ltd | Professional & scientific | 2026 |
| Keeping IT Moving Ltd | Transport & logistics | 2025 |
| Kefalonia Villa Holidays Limited | Hospitality | 2024 |
| KEL Jennings Properties Ltd | Construction | 2025 |
| Kelade Group Limited | Real estate | 2024 |
| Kellen Cleaning Company Ltd | Administrative & support | 2025 |
| Kelly Allen Ltd | Professional & scientific | 2025 |
| Kelly's Smart Bargains Ltd | Wholesale & retail | 2025 |
| Kelvinex Ltd | Professional & scientific | 2024 |
| Kembrey Place Limited | Professional & scientific | 2019 |
| Kemi & Co. Limited | Real estate | 2012 |
| Kempsters Court Management Company Limited | Real estate | 2016 |
| Kemtron Limited | Manufacturing | 1998 |
| KEN Majek Law Practice Limited | Professional & scientific | 2020 |
| Kenbrook Associates Limited | Professional & scientific | 2005 |
| Kenessa Limited | Information & communication | 2014 |
| Kengkong Jungle Network Ltd | Wholesale & retail | 2025 |
| Kenkam Security Services Ltd | Administrative & support | 2022 |
| Kennedy Rehab Limited | Health & social care | 2007 |
| Kennet Bioservices Limited | Professional & scientific | 1988 |
| Kenneth Peploe & SON Limited | Agriculture & fishing | 1964 |
| Kennett Agri Ltd | Manufacturing | 2023 |
| Kennygold Ltd | Wholesale & retail | 2024 |
| Kenoff Ltd | Health & social care | 2020 |
| Kenro Limited | Manufacturing | 1972 |
| Kenshiki (Highworth) Ltd | Professional & scientific | 2021 |
| Kent & Carey (Retail) Limited | Extraterritorial | 2000 |
| Kent END Field (Management) Limited | Households | 2009 |
| Kenuk Autospares Ltd | Wholesale & retail | 2023 |