| Kernel Mustard Ltd | Information & communication | 2021 |
| Kerry Clean Limited | Administrative & support | 2010 |
| Kettlewell BD Service Ltd | Information & communication | 2023 |
| Ketton Holdings Limited | Agriculture & fishing | 1985 |
| Kettswood Road Management Company Limited | Households | 2026 |
| Kevan Drive Fibre Limited | Information & communication | 2021 |
| Kevin Wheeler Hire Limited | Administrative & support | 2014 |
| Kevins Neurorehabilitation Consulting Ltd | Health & social care | 2015 |
| Kexun Ltd | Professional & scientific | 2014 |
| Key 2 Marketing Ltd | Professional & scientific | 2017 |
| Key Mindsets Ecommerce Ltd | Wholesale & retail | 2017 |
| Key Three Data Ltd | Information & communication | 2018 |
| Keyfaith Care Limited | Health & social care | 2016 |
| Keyfaith Ltd | Information & communication | 2012 |
| Keymindsets Property Limited | Real estate | 2017 |
| Keymotive Locksmiths Ltd | Manufacturing | 2024 |
| Keystone Competitions Limited | Wholesale & retail | 2026 |
| KF Facilities Limited | Real estate | 2025 |
| KF Security Limited | Administrative & support | 2019 |
| KFC Asia Holdings, LP | | 2019 |
| KFI (Surrey) Limited | Information & communication | 2018 |
| KG & SON Construction Ltd | Construction | 2017 |
| KG Trades Ltd | Wholesale & retail | 2026 |
| KGH Build Ltd | Administrative & support | 2019 |
| KH Corporate Consulting Ltd | Professional & scientific | 2019 |
| Khaleeq Limited | Manufacturing | 2022 |
| Khalil Minas Limited | Health & social care | 2019 |
| Khan Cousins Ltd | Hospitality | 2019 |
| Khan Karahi & Catering Ltd | Hospitality | 2025 |
| Khan Stalls Limited | Wholesale & retail | 2024 |
| Khans Imperial Super Store Ltd | Wholesale & retail | 2022 |
| Kharel Property Ltd | Real estate | 2024 |
| Khawaja Management Ltd | Professional & scientific | 2023 |
| Khola Limited | Professional & scientific | 2012 |
| Khuki's Collection Limited | Wholesale & retail | 2020 |
| Kianis-Uk Ltd | Wholesale & retail | 2024 |
| Kiap Ventures Limited | Other services | 2014 |
| Kickoff Coaching Ltd | Arts & recreation | 2015 |
| Kidney Cancer Care Limited | Health & social care | 2006 |
| Kidney Cancer UK Limited | Health & social care | 2000 |
| Kidwise Group C.I.C. | Education | 2022 |
| KIJ & RB Properties Limited | Real estate | 2020 |
| Kikkirossi UK Ltd | Professional & scientific | 2013 |
| Killowen Consultancy Ltd | Construction | 2018 |
| KIM Murphy Coaching Ltd | Other services | 2024 |
| Kimberleigh Tucker Limited | Administrative & support | 2025 |
| Kincraig Capital Limited | Real estate | 2009 |
| Kind Hearts Care Company Ltd | Public administration | 2020 |
| Kind&Green Ltd | Administrative & support | 2025 |
| Kinfolks Inc. Limited | Wholesale & retail | 2021 |
| King Acre Landscapes Ltd | Other services | 2009 |
| Kingfield Community Sports Centre Limited | Arts & recreation | 1997 |
| Kingfield Kebab Ltd | Hospitality | 2025 |
| Kingfisher Creative Ltd | Professional & scientific | 2016 |
| Kings Court (Plymouth) Limited | Health & social care | 2015 |
| Kings Gate (Pyrford) Management Company Limited | Households | 2000 |
| Kings Kicks Ltd | Wholesale & retail | 2022 |
| Kings Kleans LLP | | 2025 |
| Kingsbrook Property Ltd | Real estate | 2023 |
| Kingsbury MEP Limited | Construction | 2021 |
| Kingsford Coaching Limited | Information & communication | 2021 |
| Kingsford Group Holdings Limited | Financial services | 2023 |
| Kingshill Plotholders Limited | Real estate | 2012 |
| Kingsmeadow Club Limited | Hospitality | 2001 |
| Kingston Cars 13 Limited | Wholesale & retail | 2017 |
| Kingston Playball Limited | Arts & recreation | 2012 |
| Kingstons Homes Limited | Real estate | 1971 |
| Kingswood Close Limited | Households | 2008 |
| Kingswood Recycling Ltd | Water & waste | 2023 |
| Kinnaird Negotiation Limited | Administrative & support | 2017 |
| Kinovia Limited | Information & communication | 2026 |
| Kinreim Systems Ltd | Information & communication | 2016 |
| Kinsman Cannon Ltd | Professional & scientific | 2002 |
| Kiosk Kompany Limited | Hospitality | 2018 |
| Kipl Ltd | Information & communication | 2024 |
| Kirat RAI Mangkhim and Sakela Management CIC | Other services | 2014 |
| Kirk Lord Ltd | Construction | 2014 |
| Kiso Investments Ltd | Real estate | 2024 |
| Kisonauto Ltd | Information & communication | 2024 |
| Kitbag Productions Ltd | Information & communication | 2012 |
| Kitsilva Ltd | Information & communication | 2015 |
| Kitwalls Communications Ltd | Professional & scientific | 2019 |
| Kivalo Limited | Hospitality | 2025 |
| KJ Properties (Surrey) Ltd | Real estate | 2024 |
| KJG Ltd | Professional & scientific | 2005 |
| KJI Investments Ltd | Real estate | 2017 |
| KK Cloud Limited | Professional & scientific | 2022 |
| KK Properties & Holdings Ltd | Real estate | 2025 |
| KKE EHV Construction and Project Management Solutions Ltd | Manufacturing | 2014 |
| Klaabu Consultants Ltd | Professional & scientific | 2022 |
| Kloud Circle Ltd | Wholesale & retail | 2022 |
| KM Autohaus Ltd | Wholesale & retail | 2026 |
| KM Design Studio Ltd | Professional & scientific | 2022 |
| KMC Developments Limited | Construction | 2005 |
| KMG7 Properties Limited | Construction | 2013 |
| KML Interim Ltd | Professional & scientific | 2018 |
| KMW Publicity & Marketing Limited | Administrative & support | 2018 |
| KN Law Consulting Ltd | Professional & scientific | 2020 |
| Knap Cafe Ltd | Hospitality | 2018 |
| Knaphill DC Ltd | Other services | 2026 |