| K a MOT & Repair Centre Ltd | Manufacturing | 2016 |
| K Kaur Investments Ltd | Real estate | 2021 |
| K Smart Ltd | Wholesale & retail | 2019 |
| K&M Logistics Ltd | Transport & logistics | 2024 |
| Kahlon Construction Limited | Construction | 2020 |
| Kahloon Overseas Services Ltd | Education | 2025 |
| KAI Projects Ltd | Administrative & support | 2015 |
| KAI Sustainability Group Limited | Professional & scientific | 2025 |
| Kaitkend Limited | Wholesale & retail | 2025 |
| Kalashhree Limited | Wholesale & retail | 2025 |
| Kallisti Aesthetics Ltd | Health & social care | 2019 |
| KAM Commerce Ltd | Wholesale & retail | 2026 |
| Kam's Property Investments Ltd | Real estate | 2025 |
| Kami Enterprises Ltd | Wholesale & retail | 2021 |
| Kangtransit Ltd | Transport & logistics | 2025 |
| Karia Medical Services Ltd | Health & social care | 2022 |
| Karia Property Services Limited | Real estate | 2023 |
| Karl Day Decorating Ltd | Construction | 2026 |
| Karma Kafe Limited | Hospitality | 2025 |
| KAS & Co Limited | Construction | 1995 |
| Kastek Solutions Limited | Construction | 2023 |
| Kata's Crafts Ltd | Wholesale & retail | 2021 |
| Katana Property Limited | Real estate | 2008 |
| Katana Residential Limited | Real estate | 2012 |
| Katori Properties Ltd | Real estate | 2024 |
| Kavah Limited | Hospitality | 2024 |
| Kavis Technologies Ltd | Information & communication | 2016 |
| Kavish Construction Ltd | Administrative & support | 2022 |
| Kawan Roger Consultants Ltd | Construction | 2020 |
| Kayseayes Limited | Information & communication | 2015 |
| Kayzed Ltd. | Real estate | 2018 |
| KBS Capital Ltd | Real estate | 2026 |
| KCS Fryers Limited | Wholesale & retail | 2026 |
| Kendra Scott UK Limited | Wholesale & retail | 2017 |
| Kensington Social Ltd. | Hospitality | 2022 |
| Kevin Butler Carpentry Ltd | Manufacturing | 2021 |
| Kevin Holley Building Services Ltd | Construction | 2003 |
| KEW Data Consultants Ltd | Information & communication | 2023 |
| KEY2CAR Ltd | Information & communication | 2026 |
| Keystone Couriers Limited | Transport & logistics | 2024 |
| KGC Carpentry Ltd | Manufacturing | 2020 |
| KGE Consultants Limited | Administrative & support | 2025 |
| Khan Premier Holdings Ltd | Real estate | 2024 |
| Khan Telecom Limited | Information & communication | 2026 |
| Khan Tradehub Ltd | Wholesale & retail | 2025 |
| Khaneja Food Beer & Wine Limited | Wholesale & retail | 2023 |
| Khehra Construction Limited | Construction | 2018 |
| Khehra Wedding Lights Ltd | Administrative & support | 2025 |
| KHO & Co Estate Agents Ltd | Real estate | 2023 |
| Kier Charles Property Services Limited | Real estate | 2020 |
| KIM Properties Limited | Real estate | 2016 |
| Kind Services Ltd | Administrative & support | 2026 |
| King Delivery Solutions Limited | Transport & logistics | 2024 |
| Kingfisher Electrical Services Limited | Professional & scientific | 2016 |
| Kingsbury Property Management Limited | Real estate | 2025 |
| Kingsman Male Hair Ltd | Other services | 2025 |
| Kingswell Consulting Group Ltd | Professional & scientific | 2026 |
| Kinsella Brothers Developments Limited | Construction | 2004 |
| Kirpa Developers Ltd | Construction | 2025 |
| KK Auto Cars Ltd | Wholesale & retail | 2024 |
| KK Medical Solutions Ltd | Health & social care | 2026 |
| Kkperito Limited | Public administration | 2022 |
| Klaus Services Ltd | Transport & logistics | 2020 |
| KLM Law Ltd | Administrative & support | 2017 |
| Kmdb Ltd | Manufacturing | 2025 |
| KMR Services Limited | Wholesale & retail | 2002 |
| KMS Technovate Ltd | Information & communication | 2026 |
| KN Team Ltd | Information & communication | 2015 |
| KND Building Group Ltd | Construction | 2026 |
| Knowle Green Estates Limited | Real estate | 2016 |
| Knox Beattie Limited | Professional & scientific | 2012 |
| KNP Security Ltd | Administrative & support | 2025 |
| KNY Limited | Professional & scientific | 2025 |
| Kola Bulders Ltd | Construction | 2025 |
| Kolin Builders Ltd | Construction | 2015 |
| Konnexa Consulting Limited | Professional & scientific | 2023 |
| KPD Electrical Ltd | Construction | 2023 |
| KPN Accounting Limited | Professional & scientific | 2024 |
| KPP Care Limited | Health & social care | 2023 |
| KRB Roofing Limited | Construction | 2025 |
| Krisahasti Assets Limited | Real estate | 2024 |
| Krishna Cloud Solutions Limited | Information & communication | 2023 |
| Krishna Consultancy Services Ltd | Professional & scientific | 2022 |
| Kristina Tutenyurd Limited | Manufacturing | 2023 |
| Krum&Ani Ltd | Transport & logistics | 2019 |
| KS Clips Ltd | Wholesale & retail | 2023 |
| KSS Jawahur Limited | Real estate | 2026 |
| Kukal Logistics Ltd | Transport & logistics | 2018 |
| Kusina DE Isobel Ltd | Hospitality | 2025 |
| Kwantumx Ltd | Information & communication | 2025 |
| KXT Consulting Limited | Other services | 2021 |
| Kxtax Consulting Limited | Other services | 2025 |
| Kyabirwa Limited | Health & social care | 2014 |
| Kynance Vale Ltd | Construction | 2017 |
| Kyora Limited | Administrative & support | 2025 |
| Kypper Limited | Wholesale & retail | 2020 |
| KZC Transport Logistics Ltd | Transport & logistics | 2014 |
| L & L Marble and Granite Ltd | Manufacturing | 2022 |
| L.J.S. Enamellers Limited | Professional & scientific | 2012 |
| L.R Crown Holdings UK Limited | Real estate | 2023 |