| Justincharman Ltd | Wholesale & retail | 2025 |
| Justmybike Ltd | Wholesale & retail | 2019 |
| JV Blinds Limited | Construction | 2022 |
| Jverame Limited | Administrative & support | 2022 |
| JVP Creations Limited | Real estate | 2020 |
| JW Prop Services Limited | Other services | 2017 |
| K & C Hair Ltd | Other services | 2026 |
| K & D Patel Ltd | Health & social care | 2017 |
| K Dinning Limited | Hospitality | 2024 |
| K Gora Holdings Limited | Financial services | 2024 |
| K H Dental Holdings Limited | Financial services | 2021 |
| K Harper Ltd | Other services | 2022 |
| K M F Property Services Ltd | Public administration | 2022 |
| K M Motor Engineering Limited | Wholesale & retail | 2012 |
| K W Concrete Structures Ltd | Construction | 2007 |
| K&G Sweet Tooth Limited | Hospitality | 2025 |
| K&M Solutions & Co. Ltd | Construction | 2021 |
| K&S Auto-Repairs Ltd | Wholesale & retail | 2025 |
| K&S Smile Limited | Health & social care | 2010 |
| K&T Wellness Limited | Wholesale & retail | 2021 |
| K.C.R.A. Limited | Households | 1985 |
| K.H.A. Limited | Households | 1991 |
| K.U.Textiles Ltd. | Wholesale & retail | 2022 |
| K2 Construction (South East) Limited | Construction | 2001 |
| Kafico Limited | Information & communication | 2016 |
| Kaira African Market Limited | Wholesale & retail | 2025 |
| Kaira Transfex Ltd | Wholesale & retail | 2023 |
| Kajal Enterprise Limited | Wholesale & retail | 2026 |
| Kajal Premier Limited | Wholesale & retail | 2014 |
| Kalsi Group Ltd | Real estate | 2020 |
| KAM AID Ltd | Professional & scientific | 2026 |
| Kamil Wojciuk Engineering Solutions Ltd | Professional & scientific | 2017 |
| Kana Contrarian Properties Ltd | Real estate | 2025 |
| Kana Dental Academy Ltd | Education | 2022 |
| Kana Dental Limited | Health & social care | 2021 |
| Kana Health Group Limited | Health & social care | 2017 |
| Kandaka Limited | Real estate | 2019 |
| Kandi Clothing Ltd | Wholesale & retail | 2025 |
| Kaneera (Medway) Limited | Wholesale & retail | 2023 |
| Kaneera Express (Bermondsey) Limited | Wholesale & retail | 2024 |
| Kaneera Express (Tonbridge) Limited | Wholesale & retail | 2024 |
| Kanik Ltd | Hospitality | 2012 |
| Kapataz Ltd | Arts & recreation | 2023 |
| Kapdor Ltd | Arts & recreation | 2018 |
| Karaca (Sussex) Limited | Hospitality | 2008 |
| Kardelicious Ltd | Professional & scientific | 2024 |
| Karen Clarke Orthodontics Limited | Health & social care | 2021 |
| Karibou Limited | Information & communication | 2022 |
| Kariem Limited | Health & social care | 2019 |
| Karma Campers Ltd | Construction | 2025 |
| Karmalife Ltd | Real estate | 2017 |
| Karmea Ltd | Health & social care | 2006 |
| Karokh Limited | Wholesale & retail | 2025 |
| Karri Training & Consultancy Ltd | Professional & scientific | 2026 |
| KAS Pathology Limited | Health & social care | 2019 |
| Kasa Dental Ltd | Health & social care | 2021 |
| Kathleen King Limited | Professional & scientific | 2015 |
| Katslashes Ltd | Other services | 2025 |
| Kavita Patel Ltd | Health & social care | 2023 |
| KAY 4 Karz Limited | Transport & logistics | 2013 |
| Kayleigh Lettings Limited | Real estate | 2021 |
| Kazoo Films Ltd | Information & communication | 2024 |
| KBB Plumbing Limited | Construction | 2013 |
| KC Arora Limited | Health & social care | 2025 |
| KC Heathfield | Other services | 2003 |
| KCL & HL Ltd | Construction | 2021 |
| KD Fishing Ltd | Agriculture & fishing | 2025 |
| KD Tax Ltd | Professional & scientific | 2019 |
| Kdental Limited | Education | 2021 |
| KDJ Services Ltd | Transport & logistics | 2016 |
| KDM Limited | Real estate | 2026 |
| KDT Pet Supplies Ltd | Wholesale & retail | 2013 |
| Keabwan Ltd | Financial services | 2016 |
| Keep IT Light House Clearance Co. Ltd | Transport & logistics | 2026 |
| Keith Bateman Ltd | Information & communication | 2023 |
| Kemlec Limited | Construction | 2024 |
| Kemp House Management (Corby) Limited | Real estate | 2005 |
| Kenilworth Leaseholders Ltd | Households | 2006 |
| Kenitos Piri Eastbourn Ltd | Hospitality | 2024 |
| Kennedy Stewart Limited | Hospitality | 2018 |
| Kensington Gardens (Brislington) Management Limited | Households | 1987 |
| Kensington HSD Limited | Health & social care | 2022 |
| Kensusco Ltd | Administrative & support | 2018 |
| Kent & Sussex Motors Ltd | Wholesale & retail | 2025 |
| Kent and Sussex Medical Limited | Health & social care | 2015 |
| Kent Close Limited | Hospitality | 1963 |
| Kent Dental Services Ltd | Health & social care | 2023 |
| Kent Endo Ltd | Health & social care | 2022 |
| Kent Invest Limited | Construction | 2025 |
| Kent Vapours Ashford Limited | Wholesale & retail | 2018 |
| Kent Vapours DGC Wholesale Limited | Wholesale & retail | 2018 |
| Kent Vapours Folkestone Limited | Wholesale & retail | 2013 |
| Kent Vapours New Romney Limited | Wholesale & retail | 2016 |
| Kent Wholesale Tyres Ltd | Wholesale & retail | 2022 |
| Kentdent Ltd | Health & social care | 2014 |
| Kentick Ltd | Financial services | 2018 |
| Kenward & Stevens Carpentry & Construction Limited | Construction | 2018 |
| Kenward Developments Limited | Construction | 2025 |
| Kerala BD Ltd | Hospitality | 2025 |
| Kernik Limited | Real estate | 2013 |