| Kents Property Limited | Construction | 1976 |
| Keptie Consulting Limited | Professional & scientific | 2025 |
| KER and KER Properties Ltd | Real estate | 2025 |
| Kernow Enterprises Limited | Information & communication | 2012 |
| Kerr Nicol Limited | Professional & scientific | 2016 |
| Kersey Hulme Ltd | Real estate | 2023 |
| Kestrel House (Farnham) Management Company Limited | Households | 1989 |
| Kestrel House (Freehold) Limited | Households | 2015 |
| KEV & Transport Limited | Wholesale & retail | 2022 |
| Key Construction and Developments Ltd | Construction | 2013 |
| Key Partners Limited | Construction | 2015 |
| Key Productions Ltd | Information & communication | 2006 |
| Keynote Audio Services Ltd. | Information & communication | 1977 |
| Keystage Commercial Ltd | Real estate | 2015 |
| KF Carpentry and Construction Ltd | Construction | 2022 |
| KFB Consulting Ltd | Professional & scientific | 2020 |
| KHA Solutions Ltd | Information & communication | 2007 |
| Khtp Consultancy Limited | Professional & scientific | 2019 |
| Kiasu Assets Ltd | Financial services | 2024 |
| Kibo Strategy Limited | Professional & scientific | 2024 |
| Kicka Limited | Extraterritorial | 2025 |
| Kieno Investments Limited | Financial services | 2023 |
| Kieran Daniel Ltd | Education | 2015 |
| Kiln Stables Training Limited | Arts & recreation | 2009 |
| Kilners Financial Services Ltd | Professional & scientific | 2022 |
| Kilnside Orchards Limited | Manufacturing | 1993 |
| Kilnside Technologies Limited | Manufacturing | 2026 |
| Kindell Consulting Limited | Professional & scientific | 2019 |
| Kinderfolk Limited | Wholesale & retail | 2019 |
| Kinetic Auto Sales Limited | Wholesale & retail | 2011 |
| Kingcup Builders Limited | Construction | 2014 |
| Kingdom Park Management Company Limited | Households | 1987 |
| Kingfisher Barn Limited | Households | 1992 |
| Kingfisher Fire & Security Limited | Administrative & support | 2000 |
| Kingfisher Security (UK) Limited | Administrative & support | 1993 |
| Kingfisher Security Limited | Administrative & support | 2002 |
| Kinglea Property Co.Limited | Real estate | 1960 |
| Kingport Investments Limited Liability Partnership | | 2006 |
| Kingsgate (Woking) Management Company Limited | Households | 2000 |
| Kingston GIN Ltd | Manufacturing | 2026 |
| Kingston Road Residents Association Limited | Real estate | 2003 |
| Kinsale Systems Limited | Information & communication | 1990 |
| Kintamani Property Development Ltd | Construction | 2023 |
| KIS Marketing Limited | Professional & scientific | 2009 |
| Kitchen Wagons Limited | Other services | 2024 |
| Kitty and Kate Limited | Information & communication | 2020 |
| Kiva Associates Ltd | Professional & scientific | 2012 |
| Kiwi and Kloud Properties Ltd | Real estate | 2023 |
| Kjessler Ltd | Professional & scientific | 2013 |
| KJP Legal Services Limited | Professional & scientific | 2023 |
| KLA Construction Limited | Wholesale & retail | 2008 |
| Klimatech Consulting Limited | Professional & scientific | 2025 |
| KLM Ltd | Other services | 2025 |
| KM Properties Surrey Ltd | Real estate | 2021 |
| KMB Arts Ltd | Arts & recreation | 2021 |
| Knaphill Domestic Services Limited | Other services | 2026 |
| Knight Kwan Limited | Administrative & support | 2009 |
| Knowle Enterprises Ltd | Construction | 2014 |
| Kognitive-Uk Limited | Professional & scientific | 2020 |
| Konoc Ltd | Manufacturing | 2013 |
| Koovoy Ltd | Information & communication | 2018 |
| Kordia Limited | Administrative & support | 2024 |
| Kotze Consulting Ltd | Professional & scientific | 2025 |
| Kounsell Ltd | Health & social care | 2024 |
| Kounter Limited | Professional & scientific | 2023 |
| Kovaco UK Limited | Wholesale & retail | 2020 |
| KPC Contractors Ltd | Construction | 2015 |
| Kpmn Consultancy Limited | Information & communication | 2023 |
| KPO Investments Limited | Professional & scientific | 2024 |
| Kramer Westfield Holdings Limited | Administrative & support | 1997 |
| Krutham UK Limited | Professional & scientific | 2018 |
| KSK Project Services Limited | Professional & scientific | 2015 |
| KSM Communications Limited | Information & communication | 2014 |
| KSM Property Investments Limited | Real estate | 2016 |
| Kstner Ltd | Wholesale & retail | 2016 |
| Ktnk Investments Limited | Financial services | 2025 |
| KTS Fencing Ltd | Construction | 2024 |
| Kudosfx Limited | Administrative & support | 2001 |
| L & a Ventures Limited | Professional & scientific | 2012 |
| L & K Music Limited | Wholesale & retail | 1979 |
| L & L Fine Art Limited | Wholesale & retail | 2014 |
| L Mees Plastering Ltd | Construction | 2025 |
| L Nolan Ltd | Health & social care | 2024 |
| L&M Construction Team Limited | Construction | 2018 |
| L&S Chartering Consultancy Ltd | Professional & scientific | 2024 |
| L'Atelier by Matt Ltd | Manufacturing | 2025 |
| L.G.N. Holdings Limited | Financial services | 1975 |
| L4 Teamwear Ltd | Wholesale & retail | 2020 |
| LA Femme Beauty Salon Limited | Other services | 2003 |
| LA Vida Properties Limited | Real estate | 2019 |
| Labeena Homes Limited | Real estate | 2019 |
| Labelium UK Ltd | Information & communication | 2010 |
| Labid Cars Ltd | Wholesale & retail | 2023 |
| Labidtech Ltd | Professional & scientific | 2015 |
| Lacero Platform Limited | Information & communication | 2016 |
| Lacey Capital Limited | Hospitality | 2022 |
| Lacey Real Estate Investments Limited | Real estate | 2016 |
| Lacquerworks Company Limited | Manufacturing | 1996 |
| Ladda Thai Cuisine Ltd | Hospitality | 2026 |
| Ladywood Court Limited | Households | 2014 |