| Kingsclere Motor Company Ltd | Wholesale & retail | 2021 |
| Kingsley Surveyors and Property Consultants Ltd | Construction | 2022 |
| Kingsmead Day Nursery Limited | Education | 2013 |
| Kingston 20 Caribbean MIX Cuisine Ltd | Hospitality | 2020 |
| Kingsvale Court Management Company Limited | Households | 1989 |
| Kinipizza Ltd | Hospitality | 2022 |
| Kinjitou Solutions Limited | Extraterritorial | 2021 |
| Kion Financial Services Limited | Financial services | 2011 |
| Kirsty Martin Beauty Ltd | Other services | 2018 |
| KIT and Co (UK) Ltd | Construction | 2019 |
| Kitchen Management Services Ltd | Manufacturing | 2017 |
| Kitchen Worx (UK) Limited | Construction | 2010 |
| Kiviiri Construction Ltd | Construction | 2025 |
| Kiwi IP Ltd | Professional & scientific | 2023 |
| KKB Holding Ltd | Financial services | 2025 |
| KKB Smiles Ltd | Health & social care | 2022 |
| KKB Surrey Ltd | Health & social care | 2025 |
| KL Marketing Group Ltd | Professional & scientific | 2025 |
| Kleibercare Limited | Health & social care | 2010 |
| Kleibercorp Ltd | Health & social care | 2016 |
| KME Construction Ltd | Construction | 2013 |
| KME Property Investment Ltd | Real estate | 2024 |
| KML Electrical Ltd | Construction | 2024 |
| Kmpv Limited | Health & social care | 2016 |
| KMS Halal Foods Ltd | Wholesale & retail | 2023 |
| KMS Lifting Ltd | Professional & scientific | 2024 |
| KNG Engineering Ltd | Professional & scientific | 2014 |
| Knight Carpentry & Construction Ltd | Construction | 2018 |
| Knightley Harrison Limited | Professional & scientific | 2007 |
| Knitter-Switch UK Limited | Manufacturing | 1984 |
| Know More Nails Limited | Other services | 2008 |
| Koal Ltd | Construction | 2020 |
| Koautos Ltd | Wholesale & retail | 2023 |
| Kokoro Grove Ltd | Health & social care | 2024 |
| Komainu Bengals Ltd | Agriculture & fishing | 2025 |
| Konco Events Limited | Other services | 2017 |
| Kontibers Transport Ltd | Transport & logistics | 2025 |
| Kordial Limited | Information & communication | 2015 |
| Korky Ltd | Households | 2025 |
| Koson Denarius Ltd | Wholesale & retail | 2021 |
| Kove Coffee House Ltd | Hospitality | 2026 |
| Kowalski Limited | Administrative & support | 2025 |
| KOWRG21 Ltd | Hospitality | 2020 |
| KP Maverick Group Limited | Information & communication | 2024 |
| KPT Properties Limited | Construction | 2009 |
| KPW Contracting Services Limited | Professional & scientific | 2016 |
| KR Maintenance and Property Refurbishment Limited | Construction | 2024 |
| Krazy Bodywork Limited | Wholesale & retail | 2016 |
| KRB Construction Limited | Construction | 2002 |
| KRH Work Psychology Ltd | Professional & scientific | 2023 |
| Krikus Solutions Limited | Information & communication | 2023 |
| Krishna Limitless Care Ltd | Other services | 2012 |
| KRT Property and Steel Limited | Construction | 2021 |
| Krystal Kitchens Limited | Construction | 2023 |
| Krystals Solutions Limited | Information & communication | 2017 |
| KS Digitals Ltd | Professional & scientific | 2024 |
| KS Engineering Products Limited | Professional & scientific | 2007 |
| Ksef Futures Ltd | Real estate | 2025 |
| KSN Trans Ltd | Transport & logistics | 2026 |
| Ksnm Global Ltd | Wholesale & retail | 2012 |
| KSY Trans Ltd | Transport & logistics | 2025 |
| KT Comms Ltd | Construction | 2022 |
| KT Glazing Ltd | Construction | 2021 |
| KTM One Limited | Information & communication | 2024 |
| Kuedos Ltd | Wholesale & retail | 2021 |
| Kular Aulakh Ltd | Health & social care | 2018 |
| Kulite Sensors Limited | Manufacturing | 1974 |
| Kulz Trader Ltd | Wholesale & retail | 2020 |
| Kulzer Ltd | Administrative & support | 1995 |
| Kurd Barber Winchester Ltd | Other services | 2024 |
| Kuriah Group Ltd | Financial services | 2026 |
| Kushti Comics Ltd | Wholesale & retail | 2022 |
| Kustomhouse Limited | Wholesale & retail | 2019 |
| KVP Consulting Limited | Health & social care | 2018 |
| KW Power Solutions Ltd | Construction | 2026 |
| Kwinto Limited | Transport & logistics | 2019 |
| Kybos Ltd | Information & communication | 2021 |
| Kyoeisha U.K Ltd | Wholesale & retail | 2007 |
| Kypps Ltd | Information & communication | 2020 |
| L & M Autocare Limited | Wholesale & retail | 2009 |
| L C a Carpentry Ltd | Construction | 2024 |
| L G Motion Limited | Manufacturing | 2004 |
| L Stratton Consulting Limited | Administrative & support | 2024 |
| L!Ft for Psychiatry and Therapy Services Ltd | Health & social care | 2025 |
| L&A Carpentry Ltd | Construction | 2019 |
| L&S Signature Gifts Limited | Wholesale & retail | 2024 |
| L'Accord Limited | Professional & scientific | 2025 |
| L'Arte (Basingstoke) Limited | Hospitality | 2023 |
| L.A.C. Flooring Solutions Ltd | Construction | 2025 |
| LA Petite Wardrobe Ltd | Wholesale & retail | 2017 |
| LA Quinta Property Limited | Extraterritorial | 2011 |
| LA Urban Estate Ltd | Real estate | 2026 |
| LAB Contractors Ltd | Construction | 2019 |
| LAB Nail & Brow Ltd | Other services | 2026 |
| Labcold Holdings Limited | Manufacturing | 2015 |
| Labcold Limited | Manufacturing | 1932 |
| Labshield Limited | Manufacturing | 2011 |
| Labyrinth Landscapes Ltd | Administrative & support | 2020 |
| Lacey Commercial Ltd | Construction | 2024 |
| Ladera Investments Limited | Financial services | 2022 |