| KP Fruits Ltd | Wholesale & retail | 2017 |
| KP Handymen & Bldg Services. Limited | Construction | 2025 |
| KP Screeding Ltd | Construction | 2017 |
| KP Touring Ltd | Professional & scientific | 2024 |
| KP1 New Co Limited | Real estate | 2023 |
| KP2 New Co Limited | Financial services | 2023 |
| Kpbc Limited | Professional & scientific | 2019 |
| Kpfa Limited | Professional & scientific | 2020 |
| KPI Homes Ltd | Construction | 2019 |
| KPK Interiors Ltd | Construction | 2019 |
| Kpmr Properties Limited | Real estate | 2024 |
| KPN Trading Limited | Wholesale & retail | 2017 |
| KPS News Limited | Wholesale & retail | 2025 |
| KQ Solicitors Ltd | Professional & scientific | 2025 |
| KR Business Ltd | Real estate | 2026 |
| Kraft Telecom Limited | Information & communication | 2017 |
| Kraksi Ltd | Construction | 2014 |
| Krdc Ltd | Arts & recreation | 2026 |
| Krider Ltd | Wholesale & retail | 2026 |
| Kris Aviation Ltd | Manufacturing | 2017 |
| Krisbek Ltd | Construction | 2019 |
| Krish.Simh Limited | Wholesale & retail | 2025 |
| Krispy Lemon Chicken Limited | Hospitality | 2019 |
| Krispy Luton Ltd | Hospitality | 2025 |
| Kristal Transport Limited | Transport & logistics | 2018 |
| Kristi Style Ltd | Transport & logistics | 2018 |
| Kristiana Care Services Ltd | Health & social care | 2020 |
| Kristof 79 Ltd | Construction | 2024 |
| KRK Retail Limited | Wholesale & retail | 2024 |
| Krns Enterprise Limited | Hospitality | 2024 |
| Kronos Health Limited | Health & social care | 2016 |
| Krownd Ltd | Real estate | 2023 |
| KRP Solution Ltd | Transport & logistics | 2025 |
| KRR Consultancy Limited | Professional & scientific | 2016 |
| Krrs Transport Limited | Transport & logistics | 2024 |
| Kryssbo Ltd | Construction | 2014 |
| KS Halal Food Ltd | Wholesale & retail | 2025 |
| KSK Food & Wine 2 Ltd | Wholesale & retail | 2019 |
| KSK Food & Wine 3 Ltd | Wholesale & retail | 2020 |
| KSK Food & Wine Green Grocers Ltd | Wholesale & retail | 2022 |
| KSK Food and Wine Ltd | Hospitality | 2016 |
| KSK Signature Homes Ltd | Real estate | 2025 |
| KSN Driving School Ltd | Education | 2025 |
| KSR Investments Ltd | Financial services | 2020 |
| KT Landscaping Ltd | Administrative & support | 2023 |
| KTC Trade Limited | Wholesale & retail | 2025 |
| KTF Express Ltd | Hospitality | 2019 |
| KTG Caring Solutions Ltd | Administrative & support | 2023 |
| Ktkc Luton Ltd | Hospitality | 2024 |
| KTN Mechanical Engineering Ltd | Construction | 2024 |
| KTS Auto Parts Ltd | Wholesale & retail | 2020 |
| KUB Construction Ltd | Construction | 2020 |
| Kube Software Solutions Ltd | Information & communication | 2011 |
| Kuber Properties Ltd | Real estate | 2022 |
| Kubsha Wholesale Ltd | Wholesale & retail | 2026 |
| Kulcheywala Ltd | Hospitality | 2024 |
| Kuljinderraj Limited | Real estate | 2025 |
| Kulka Contractor Ltd | Manufacturing | 2018 |
| Kullar Property Limited | Real estate | 2018 |
| Kulwinder SINGH2 Ltd | Construction | 2020 |
| Kumba Limited | Hospitality | 2023 |
| Kunafa Dreamz Ltd | Hospitality | 2025 |
| Kunmix Limited | Health & social care | 2012 |
| Kunta Trans Ltd | Construction | 2022 |
| KUP Properties Limited | Real estate | 2023 |
| Kuparo Limited | Information & communication | 2018 |
| Kupid Konnect Solutions Ltd | Information & communication | 2026 |
| Kurbside Kitchen Ltd | Hospitality | 2025 |
| Kurd CUT Barbers Luton Ltd | Other services | 2025 |
| Kurdish Barber Luton Ltd | Other services | 2025 |
| Kurdish NO1 Cuts Limited | Other services | 2026 |
| Kurek Limited | Transport & logistics | 2017 |
| Kurta Fashions Ltd | Wholesale & retail | 2025 |
| Kutchenhaus (Luton) Limited | Wholesale & retail | 2023 |
| Kuul Tech Ltd | Information & communication | 2023 |
| Kvlt Limited | Wholesale & retail | 2025 |
| KVO Developments Ltd | Real estate | 2025 |
| Kvpp Ltd | Wholesale & retail | 2023 |
| KVR Electrical Ltd | Construction | 2024 |
| KW Inns Ltd | Hospitality | 2016 |
| Kwachangwe Ltd | Wholesale & retail | 2019 |
| Kwame Twumasi Limited | Transport & logistics | 2018 |
| Kwapo Cleaning UK Ltd | Administrative & support | 2025 |
| Kwass Limited | Transport & logistics | 2013 |
| KWI Property Ltd | Real estate | 2026 |
| Kwik Flights Ltd | Administrative & support | 2025 |
| Kwik Gear Limited | Wholesale & retail | 2017 |
| Kwik Pass Training Ltd | Education | 2021 |
| Kwiya Ltd | Information & communication | 2019 |
| Kx(Bedford) Property Services Limited | Real estate | 2025 |
| KY Maintenance Luton Limited | Construction | 2026 |
| Kyali Group Consulting Ltd | Transport & logistics | 2023 |
| Kymbs Investments Ltd | Real estate | 2022 |
| Kyra Studios Ltd | Transport & logistics | 2024 |
| KYS Carz Ltd | Wholesale & retail | 2021 |
| KYS Couriers Limited | Transport & logistics | 2025 |
| Kysn Management Limited | Households | 2025 |
| KYT Build for Care Limited | Construction | 2026 |
| KYT Social Care and Advocacy Services Ltd | Health & social care | 2025 |
| KZ Property Holdings Ltd | Real estate | 2022 |