| Kingwell Consulting Limited | Professional & scientific | 2026 |
| Kingwill Property Investment Ltd | Real estate | 2021 |
| Kinswin 168 Limited | Hospitality | 2014 |
| Kirkley Plumbing and Heating Limited | Construction | 2016 |
| Kiss DC UK Limited | Wholesale & retail | 2023 |
| Kitch Project Services Ltd | Professional & scientific | 2009 |
| Kitchen Connoisseurs Ltd | Hospitality | 2023 |
| Kitchencraft (Surrey) Limited | Wholesale & retail | 2001 |
| Kivan Construction Limited | Construction | 2017 |
| Kiwi House Ltd | Real estate | 2025 |
| KJD Associates Ltd | Professional & scientific | 2025 |
| KJM Facilities & Events Ltd | Hospitality | 2025 |
| Kkesh Hires Ltd | Wholesale & retail | 2024 |
| Kkestrel Ltd | Information & communication | 2015 |
| KL Chinese Service Ltd | Professional & scientific | 2016 |
| KL Communications Ltd | Other services | 1999 |
| KL Group Holdings Ltd | Information & communication | 2017 |
| Kloyds Ltd | Construction | 2025 |
| Kmkikz Ltd | Wholesale & retail | 2020 |
| KMS Commercial Limited | Financial services | 2019 |
| KMY Academy Ltd | Administrative & support | 2023 |
| KND Logistic Ltd | Transport & logistics | 2022 |
| Knight Tyme Limited | Professional & scientific | 2017 |
| Knightsbridge Travel Ltd | Administrative & support | 2013 |
| Knockout Investments Ltd | Real estate | 2017 |
| Knockout Productions Ltd | Administrative & support | 2023 |
| Knox Consultancy Limited | Administrative & support | 2017 |
| KNX Associates Limited | Other services | 2011 |
| Koffee Room Limited | Wholesale & retail | 2023 |
| Kokojuju Ltd | Wholesale & retail | 2019 |
| Kollam Management Company Limited | Other services | 2010 |
| Koon-Lin Properties Limited | Real estate | 2014 |
| Korean Glam Ltd | Wholesale & retail | 2025 |
| Kourosh Supermarket Tolworth Ltd | Wholesale & retail | 2022 |
| Kowatech Technologies Limited | Professional & scientific | 2008 |
| Kraked and Associated Industries Ltd | Information & communication | 2019 |
| Kranleigh Ltd | Health & social care | 2026 |
| Kreative Medics Limited | Health & social care | 2011 |
| Kreative Property Investments Ltd | Real estate | 2021 |
| KRM Estates Limited | Construction | 2016 |
| Kruger Industrial Smoothing Ltd | Professional & scientific | 2024 |
| Krunchee Ltd | Manufacturing | 2026 |
| KS & Co Accountants Ltd | Professional & scientific | 2008 |
| KS Builders Surrey & Middlesex Ltd | Construction | 2018 |
| KS Windows Limited | Manufacturing | 2017 |
| Kspv Limited | Financial services | 2025 |
| KT Ferguson Consulting Ltd | Professional & scientific | 2020 |
| KT Maintenance Limited | Other services | 2012 |
| KT Residential Ltd | Real estate | 2011 |
| KT Restaurants and Management Ltd | Hospitality | 2022 |
| KTS Kitchens Ltd | Wholesale & retail | 2022 |
| Kubikoo Ltd | Professional & scientific | 2019 |
| Kudu Wellness Ltd | Administrative & support | 2026 |
| Kumoi Ltd | Information & communication | 2021 |
| Kuuceramics Limited | Arts & recreation | 2022 |
| Kuvera Capital Partners LLP | | 2004 |
| KV Transport 13 Ltd. | Transport & logistics | 2019 |
| KVG66 Ltd | Transport & logistics | 2024 |
| KWL2 Ltd | Real estate | 2026 |
| KWL3 Ltd | Real estate | 2026 |
| Kylin Limited | Administrative & support | 2014 |
| Kyoto Productions Ltd | Administrative & support | 2024 |
| L & M Partners Limited | Professional & scientific | 2007 |
| L V Hair Limited | Information & communication | 2012 |
| LA Lennoxa Limited | Information & communication | 1988 |
| LA Lennoxa Touring Limited | Information & communication | 1994 |
| LA Monaliza Ltd | Hospitality | 2018 |
| LA Nova Ltd | Other services | 2024 |
| LA Piastrella Italiana Ltd | Construction | 2021 |
| LA Techniques Limited | Manufacturing | 1997 |
| Labour and Play Ltd | Professional & scientific | 2011 |
| Labstuff Ltd | Professional & scientific | 2024 |
| Ladders Consulting Ltd | Information & communication | 2026 |
| Lagenza Limited | Information & communication | 2024 |
| Lakenham Development Consultancy Ltd | Professional & scientific | 2021 |
| Lakeside Real Estate Ltd | Real estate | 2018 |
| LAM New Homes World Limited | Real estate | 2026 |
| Lamba 1 Ltd | Financial services | 2023 |
| Lamedos Property Management Limited | Administrative & support | 1993 |
| Land Sphere Limited | Real estate | 2021 |
| Lanesbury Management Limited | Households | 1986 |
| Langdale Property Group Limited | Real estate | 2021 |
| Langham House Residents Association (Surbiton) Limited | Households | 1978 |
| Langley Road (Surbiton) Management Limited | Households | 2009 |
| Langton Lodge Limited | Households | 2007 |
| Lann Finance Limited | Financial services | 2006 |
| Lara Homes Group Ltd | Real estate | 2021 |
| Larkin Consulting Group Limited | Information & communication | 2020 |
| Larkwall Limited | Hospitality | 1997 |
| Larpit Trans Ltd | Transport & logistics | 2021 |
| Lashes by Hols Limited | Other services | 2022 |
| Lashes From Hols Limited | Wholesale & retail | 2022 |
| Lasi Body Sculpting Limited | Other services | 2023 |
| Lasttool Ltd | Construction | 2022 |
| Latin Delight Ltd | Wholesale & retail | 2014 |
| Lauman Investments Limited | Real estate | 2010 |
| Lauman Properties Limited | Real estate | 2015 |
| Launchpad Europe Limited | Information & communication | 2006 |
| Launchpad Investments Limited | Financial services | 2024 |
| Launchzone Ltd | Professional & scientific | 2008 |