| Jones & Jones Construction Consultants Limited | Professional & scientific | 2015 |
| Joshuadorcas Limited | Transport & logistics | 2024 |
| Joss Bay Leisure Ltd | Arts & recreation | 2024 |
| Joyful Works Software Limited | Information & communication | 2023 |
| JS Aesthetics Thanet Limited | Extraterritorial | 2022 |
| Julia Gray Limited | Information & communication | 2025 |
| Jump Over the AGE Limited | Information & communication | 2018 |
| Jungle Botanics Ltd | Wholesale & retail | 2024 |
| K D Convenience Store Ltd | Wholesale & retail | 2023 |
| K Finn & Co Limited | Professional & scientific | 2013 |
| Kady MAE Coaching Limited | Administrative & support | 2021 |
| Kaizen Game Works Limited | Information & communication | 2018 |
| Kaizen Transformations Limited | Health & social care | 2025 |
| Kamen Krastev Limited | Real estate | 2025 |
| Kard Consulting Limited | Administrative & support | 2019 |
| Kaya UK Delivery Ltd | Transport & logistics | 2021 |
| KB One Rail Limited | Construction | 2015 |
| Kcad Limited | Professional & scientific | 2023 |
| KCB Thanet Limited | Arts & recreation | 1982 |
| Kdtc Travel Limited | Administrative & support | 2018 |
| Keith Holland Motors Ltd | Wholesale & retail | 2019 |
| Kemp's Accounting Solutions Limited | Professional & scientific | 2002 |
| Kemps EOT Ltd | Extraterritorial | 2025 |
| Kent Car Craft Ltd | Wholesale & retail | 2009 |
| Kent Cellars Ltd | Hospitality | 2023 |
| Kent Coastal Holiday Properties Ltd | Real estate | 2020 |
| Kent Coastal Practice Ltd | Administrative & support | 2019 |
| Kent Dentures Limited | Health & social care | 2014 |
| Kent Direct Cremations Limited | Other services | 2024 |
| Kent Enterprise Trust | Health & social care | 1984 |
| Kent Epos Ltd | Information & communication | 2020 |
| Kent Financial Consultants Ltd | Financial services | 2020 |
| Kent Food and Wine Ltd | Extraterritorial | 2023 |
| Kent Forklift Training Limited | Education | 2011 |
| Kent Holdings Limited | Financial services | 2026 |
| Kent House West END Limited | Households | 2004 |
| Kent Physiotherapy Limited | Health & social care | 2008 |
| Kent Restoration Ltd | Administrative & support | 2019 |
| Kent Solar Solutions Ltd | Real estate | 2022 |
| Kent Supreme Cars Limited | Transport & logistics | 2022 |
| Kent Supreme Design and Build Ltd | Construction | 2025 |
| Kent Surf School Ltd | Administrative & support | 2016 |
| Kent Surveys Ltd | Professional & scientific | 2008 |
| Kent Sustainability Ltd | Professional & scientific | 2021 |
| Kent Wine & Spirits Ltd | Wholesale & retail | 2020 |
| Kentbroadco Ltd | Real estate | 2026 |
| Kentish Projects (Surrey) Limited | Construction | 2020 |
| Kentish Projects (Tunbridge Wells) Limited | Construction | 2020 |
| Kentish Projects Limited | Construction | 2012 |
| Kentish Village Developments Limited | Construction | 2015 |
| Kenton Court Freehold Limited | Real estate | 2023 |
| Kerry Long Resourcing Limited | Administrative & support | 2012 |
| KG Oakwood Estates Ltd | Households | 2013 |
| Kibou Consultancy Services Limited | Health & social care | 2026 |
| KID Desimo Productions Limited | Information & communication | 2024 |
| Kinder Collective LLP | | 2023 |
| Kingsgate Golf Club,Limited | Arts & recreation | 1946 |
| Kingsgate Property Consultants Limited | Construction | 2011 |
| Kingsgate Property Group Ltd | Real estate | 2018 |
| Kirsty LE Doare Consulting Limited | Health & social care | 2025 |
| KIT Lifestyle Limited | Wholesale & retail | 2016 |
| Klik Hire Limited | Administrative & support | 2024 |
| KMS Kent Holdings Limited | Financial services | 2020 |
| KMS Kent Limited | Education | 2016 |
| Knock Holdings Ltd | Information & communication | 2023 |
| KP (Berkshire) Limited | Construction | 2025 |
| KP Holding Group Limited | Financial services | 2025 |
| KP Surrey Holdings Limited | Real estate | 2025 |
| KPD South East Limited | Construction | 2016 |
| Krinksco Limited | Information & communication | 2022 |
| Krunic Consulting Ltd | Construction | 2024 |
| KTG (UK) Limited | Extraterritorial | 2013 |
| L and C Sales Limited | Other services | 2017 |
| L Piper Ltd | Financial services | 2018 |
| L8ONP Limited | Financial services | 2022 |
| LA Tools Limited | Wholesale & retail | 2023 |
| Labourpower Limited | Professional & scientific | 2024 |
| LAC DE Paix Limited | Real estate | 2017 |
| Ladbroke Electrical Ltd | Construction | 2021 |
| Ladyewell Properties PVT Ltd | Real estate | 2018 |
| Lakhsar Limited | Information & communication | 2022 |
| Lakshana & Akshara Ltd | Wholesale & retail | 2025 |
| Lakshana Estate Ltd | Real estate | 2023 |
| Lambda PI Products Ltd | Manufacturing | 2020 |
| Lambic Studios Limited | Information & communication | 2018 |
| Lane Holdings Limited | Real estate | 2021 |
| Lane Lights Production Creative Limited | Information & communication | 2023 |
| Lanthorne Properties Ltd | Real estate | 2016 |
| Laurmet Limited | Professional & scientific | 2009 |
| Lawns Food & Wine Ltd | Wholesale & retail | 2025 |
| Layla Clothing Limited | Wholesale & retail | 2025 |
| Layla Perfumes Limited | Wholesale & retail | 2025 |
| Lead Optimizer Ltd | Other services | 2026 |
| Leah Talks Ltd | Professional & scientific | 2021 |
| LEE the Painter Ltd | Construction | 2017 |
| Legion SD Limited | Wholesale & retail | 2019 |
| LEM 2 Limited | Administrative & support | 2009 |
| LEM Films Limited | Information & communication | 2007 |
| LEO Languages Limited | Education | 2012 |
| Let's Host for YOU Ltd | Real estate | 2021 |