| Krejczu Ltd | Transport & logistics | 2018 |
| Kris ABT Ltd | Transport & logistics | 2014 |
| Krishann Ltd | Households | 2024 |
| Krispy Feasts Ltd | Hospitality | 2024 |
| Krispy Treats Ltd | Hospitality | 2025 |
| Kristers.B Ltd | Transport & logistics | 2020 |
| Kristi Butik Ltd | Wholesale & retail | 2021 |
| Kristy Rozario Aesthetics Ltd | Other services | 2021 |
| KRM Homes Fenland Ltd | Construction | 2023 |
| KRN Express Ltd | Transport & logistics | 2023 |
| Kross Cycles UK Limited | Wholesale & retail | 2016 |
| Krubha IT Solutions UK Ltd | Information & communication | 2013 |
| Kruk & SON Ltd | Transport & logistics | 2017 |
| Kruk Trans Ltd | Transport & logistics | 2017 |
| Krzysztof Drozdowski Ltd | Transport & logistics | 2015 |
| Krzysztof Trans Ltd | Transport & logistics | 2026 |
| KS (Technical Solutions) Limited | Professional & scientific | 2015 |
| KS FC Ltd | Hospitality | 2026 |
| KS Newman Holdings Ltd | Financial services | 2022 |
| KS Newman Management Ltd | Financial services | 2024 |
| KS889 Ltd | Wholesale & retail | 2025 |
| KSC Careerwise Ltd | Education | 2019 |
| KSE Properties & Developments Limited | Real estate | 2024 |
| KSH Performance Ltd | Wholesale & retail | 2026 |
| Ksix Property Limited | Real estate | 2021 |
| KSS Compliance Limited | Professional & scientific | 2025 |
| KSS Surgery Ltd | Health & social care | 2022 |
| KST Cars Ltd | Wholesale & retail | 2025 |
| KT Afro-Caribbean Foods Limited | Wholesale & retail | 2025 |
| KT PB Ltd | Wholesale & retail | 2025 |
| KTA Hailulage UK Ltd | Transport & logistics | 2025 |
| KTA Haulage Ltd | Transport & logistics | 2022 |
| Ktamfu Limited | Professional & scientific | 2019 |
| Ktaurus Ltd | Transport & logistics | 2016 |
| Ktown LLP | | 2026 |
| KTS Transport Limited | Transport & logistics | 2022 |
| KTX Pharma Ltd | Health & social care | 2023 |
| Kubus 2 Ltd | Wholesale & retail | 2026 |
| Kuchen Kraft LLP | | 2004 |
| Kudi Express Ltd | Information & communication | 2023 |
| Kuldeep Jetty Ltd | Health & social care | 2022 |
| Kult Kanvas Limited | Wholesale & retail | 2014 |
| Kumon Peterborough Hampton Ltd | Extraterritorial | 2016 |
| Kung FU Food Ltd | Hospitality | 2024 |
| Kuni Coffee Peterborough Limited | Hospitality | 2023 |
| Kupx Ltd. | Construction | 2020 |
| Kurbside Exterior Cleaning Ltd | Administrative & support | 2025 |
| Kurdish Bakery Limited | Wholesale & retail | 2025 |
| Kurian's Financial Consultants Limited | Financial services | 2021 |
| Kuro KAT Ltd | Wholesale & retail | 2026 |
| Kurve Technologies Limited | Information & communication | 2018 |
| KUS Limited | Construction | 2020 |
| KV Auto Group Ltd | Wholesale & retail | 2026 |
| KV Group Solutions Ltd | Financial services | 2025 |
| KV Smart Homes Ltd | Real estate | 2025 |
| KVS Transport Service Ltd | Transport & logistics | 2023 |
| KWA Projects Business and Development UK Ltd | Financial services | 2020 |
| Kwenga Foods Limited | Wholesale & retail | 2020 |
| Kwikcare Services Limited | Health & social care | 2019 |
| KWW Management Limited | Wholesale & retail | 2009 |
| KX Associates Limited | Real estate | 2018 |
| Kyanite Cyber Consultants Ltd | Information & communication | 2025 |
| Kyhan Properties Limited | Real estate | 2024 |
| Kyky Trans Ltd | Transport & logistics | 2018 |
| Kyme Packaging Ltd | Wholesale & retail | 1996 |
| Kys-Recovery Ltd | Wholesale & retail | 2026 |
| Kyze Nutrition Ltd | Wholesale & retail | 2025 |
| Kyzesupplements Ltd | Wholesale & retail | 2025 |
| Kzem Limited | Professional & scientific | 2011 |
| Kzgymworks Ltd | Construction | 2024 |
| KZT Operations Ltd | Education | 2026 |
| L & C Food Market (Badersfield) Ltd | Wholesale & retail | 2023 |
| L & C Food Market (Thorpe) Ltd | Wholesale & retail | 2025 |
| L & G Electrical Services Ltd | Construction | 2017 |
| L & M (Euro) Ltd | Construction | 2005 |
| L & S Welding and Pipework Services Limited | Manufacturing | 2014 |
| L Allen Comms Limited | Administrative & support | 2016 |
| L and S Barber Shop Limited | Other services | 2019 |
| L Car Services Ltd | Wholesale & retail | 2023 |
| L China Fountain Limited | Hospitality | 2020 |
| L Dollay Optometrist Limited | Professional & scientific | 2012 |
| L J Decorators Ltd | Construction | 1996 |
| L J Domestics Ltd | Construction | 2001 |
| L J Welding Services Ltd | Manufacturing | 2018 |
| L L Glamping Limited | Manufacturing | 2017 |
| L P B Limited | Transport & logistics | 2010 |
| L Petriello Developments Ltd | Construction | 2021 |
| L Petriello Properties Ltd | Real estate | 2020 |
| L S S C Limited | Agriculture & fishing | 2002 |
| L&E Delivery Ltd | Transport & logistics | 2022 |
| L&H Property Investors Ltd | Real estate | 2015 |
| L&I Freight Services Ltd | Transport & logistics | 2026 |
| L&J Mini Mart Ltd | Wholesale & retail | 2019 |
| L&M Property Holdings Ltd | Real estate | 2025 |
| L&S Trans Ltd | Transport & logistics | 2019 |
| L&Y Holdings Ltd | Financial services | 2024 |
| L&Z Trans Ltd | Wholesale & retail | 2015 |
| L-Plate Exit Ltd | Education | 2026 |
| L. Chapman Repairs Ltd | Other services | 2019 |
| L.G. Garner & SON Limited | Construction | 2007 |