| K&M H Ltd | Health & social care | 2017 |
| K&R Holdings Limited | Financial services | 2020 |
| K&R Mason Limited | Transport & logistics | 2015 |
| K-Mac Lifting Services Ltd | Construction | 2015 |
| K-Works Blacksmithing Limited | Manufacturing | 2022 |
| K. a. Diprose Limited | Construction | 2005 |
| K. B. Coins Ltd | Professional & scientific | 2017 |
| K. B. Lewis & SON Limited | Wholesale & retail | 2003 |
| K. H. Fabrications Limited | Construction | 1997 |
| K.Cc Work Services Ltd | Arts & recreation | 2020 |
| K.J.N. Developments Ltd | Construction | 2015 |
| K.S.S. Chimney Sweeps Limited | Administrative & support | 2003 |
| K9 Holdings Kent Ltd | Arts & recreation | 2025 |
| K9 Shine Ltd | Health & social care | 2025 |
| K9DPK Limited | Professional & scientific | 2019 |
| K:C Web Design Limited | Information & communication | 2007 |
| KA Couriers Kent Ltd | Transport & logistics | 2026 |
| KA Diagnostics Ltd | Health & social care | 2024 |
| Kabita Collection Limited | Wholesale & retail | 2021 |
| Kabmans Healthcare Limited | Health & social care | 2023 |
| Kadableu Limited | Administrative & support | 2021 |
| Kagu Interiors Limited | Construction | 2011 |
| Kaizen Digital Delivery Ltd | Administrative & support | 2017 |
| Kaizen Financial Consulting UK Limited | Professional & scientific | 2024 |
| Kall Kwik Ashford Ltd | Manufacturing | 2021 |
| Kamg Translations Limited | Administrative & support | 2021 |
| Kamnye Ltd | Health & social care | 2017 |
| KAN Project Consultancy Ltd | Professional & scientific | 2017 |
| Kanmi London Group Ltd | Wholesale & retail | 2024 |
| Kannavi Ltd | Wholesale & retail | 2024 |
| Kaolin Atelier Ltd | Manufacturing | 2026 |
| Kapoor's Express Ltd | Wholesale & retail | 2026 |
| Karaya Limited | Real estate | 2021 |
| Karbon Elite Services Ltd | Administrative & support | 2025 |
| Karen Blackett Limited | Professional & scientific | 2024 |
| Karen Casswell Limited | Professional & scientific | 2010 |
| Karen Lake Ltd | Health & social care | 2020 |
| Karibella Trading Ltd | Hospitality | 2014 |
| Karim's Fallen Stock Ltd | Agriculture & fishing | 2018 |
| Karma-Aa Limited | Health & social care | 2007 |
| Karoben Limited | Education | 2011 |
| KAS Habitat Ltd. | Real estate | 2025 |
| Kasanesta Ltd | Real estate | 2019 |
| Kashglobe Ltd | Health & social care | 2024 |
| Kashtelyans Ltd | Wholesale & retail | 2010 |
| Kasio Ltd | Transport & logistics | 2022 |
| Kasko Multitrade Services Ltd | Construction | 2025 |
| Kaspas South East Ltd | Administrative & support | 2016 |
| Kast Fisheries Limited | Agriculture & fishing | 2014 |
| Kasuri Investments Ltd | Real estate | 2023 |
| Katara Holding Limited | Financial services | 2019 |
| Katherine Powell and Associates Ltd | Professional & scientific | 2018 |
| Katy Grayson E P Ltd | Education | 2019 |
| Kavish Homes Ltd | Real estate | 2026 |
| KAY Hooda Properties Limited | Real estate | 2026 |
| KAY Richards Limited | Professional & scientific | 2006 |
| Kaygan Limited | Wholesale & retail | 2025 |
| Kayleigh Henry Associates Limited | Health & social care | 2022 |
| Kaysail Limited | Professional & scientific | 2004 |
| Kazek Ltd | Transport & logistics | 2021 |
| Kazpac Holdings Ltd | Administrative & support | 2020 |
| Kazpac Packaging Limited | Manufacturing | 2012 |
| KB Fintechsys Limited | Professional & scientific | 2019 |
| Kberry Property Holdings Ltd | Real estate | 2023 |
| KBS Builders Ltd | Construction | 2021 |
| KBS Construction Team Ltd | Construction | 2012 |
| KC Global Procurement LLP | | 2012 |
| KCA (Kent) Limited | Wholesale & retail | 2020 |
| KCC Business Consultancy Ltd | Professional & scientific | 2019 |
| KCK Paid Media Group Ltd | Professional & scientific | 2024 |
| Kcmac Driving Services Limited | Transport & logistics | 2015 |
| KCS Medical Ltd | Administrative & support | 2024 |
| KCS Property Maintenance Ltd | Construction | 2022 |
| KD Visuals Ltd | Information & communication | 2023 |
| KDB Group Limited | Construction | 2022 |
| KDC Cleaning Ltd | Administrative & support | 2015 |
| KDC Medical Ltd | Administrative & support | 2016 |
| Kdkdlondon Ltd | Manufacturing | 2019 |
| KE Rigging Services Ltd | Information & communication | 2016 |
| Kearns Electrical Services Ltd | Construction | 2017 |
| KEAVIN29 Ltd | Health & social care | 2025 |
| Keel Toys Limited | Manufacturing | 1999 |
| Keen Meadows (Holdings) Limited | Professional & scientific | 1997 |
| Keen Meadows Foods Limited | Wholesale & retail | 1991 |
| Keen Meadows Limited | Professional & scientific | 1997 |
| Keenlaur Logistics Ltd | Wholesale & retail | 2026 |
| Keepers Retreat Limited | Hospitality | 2019 |
| Keepers Yard (Teddington) Residents Limited | Households | 1994 |
| Keepkit Limited | Professional & scientific | 2014 |
| Keith M. Holmes (Memorials) Limited | Manufacturing | 1934 |
| Keith Morgan Building Limited | Construction | 2017 |
| Kelly's Nail Bar Ltd | Other services | 2025 |
| Kelly's Roofing Ltd | Construction | 2022 |
| Kelmode Ltd | Construction | 2019 |
| KEM Consulting Limited | Professional & scientific | 2018 |
| Kemkem Ltd | Health & social care | 2024 |
| KEN Jenner Limited | Financial services | 2023 |
| Kencarp Construction Limited | Real estate | 2002 |
| Kendall Property Group Ltd | Real estate | 2026 |
| Kendall Richardson 2026 Limited | Professional & scientific | 2025 |