| JGE Development Ltd | Professional & scientific | 2024 |
| JH FBA Ltd | Wholesale & retail | 2025 |
| Jhayton Ltd | Transport & logistics | 2023 |
| JJD Tennis Services Ltd | Arts & recreation | 2025 |
| Joesheai PVT Limited | Real estate | 2021 |
| John Bishop Property Consultants Limited | Real estate | 1991 |
| John Gillespie Ltd | Professional & scientific | 2014 |
| Jomond Ltd | Information & communication | 2010 |
| Jonamo Limited | Financial services | 2021 |
| Jonathonowenscreative Limited | Professional & scientific | 2017 |
| Joshi HOMES11 Limited | Real estate | 2021 |
| JPM Drainage Ltd | Water & waste | 2026 |
| JR Library, ICT & Digital Services Ltd | Information & communication | 2016 |
| Jrlm Properties Ltd | Real estate | 2023 |
| JS Crop Limited | Agriculture & fishing | 2014 |
| JSW (Essex) Limited | Construction | 2025 |
| Jt&C Builders Ltd | Construction | 2020 |
| JTC Landscaping Ltd | Construction | 2024 |
| Judkin Court Management Limited | Households | 2020 |
| Junova Holdings Ltd | Real estate | 2025 |
| JV Development Residential SPV Ltd | Real estate | 2024 |
| K & R Property Investments Ltd | Real estate | 2012 |
| K Stevens (Leicester) Limited | Manufacturing | 1995 |
| Kailo Wellness Centre Ltd | Health & social care | 2024 |
| Kalyna UA Ltd | Wholesale & retail | 2025 |
| Katedesign Ltd | Professional & scientific | 2018 |
| Katharine Robinson Ltd | Professional & scientific | 2019 |
| Kaylew Plant Training Services Ltd | Construction | 2025 |
| KB Spine & Consulting Ltd | Administrative & support | 2014 |
| Kempton Property Lettings Limited | Real estate | 2017 |
| Kent Aerials Ltd | Professional & scientific | 2008 |
| Kent Build Site Management Limited | Professional & scientific | 2019 |
| Kent Building Control Surveyors Limited | Construction | 2021 |
| Kent Coast Volunteering Ltd | Information & communication | 2005 |
| Kent Coastal Development SPV Ltd | Real estate | 2024 |
| Kent Handyman Service Limited | Administrative & support | 2016 |
| Kent Independent Services Limited | Information & communication | 2007 |
| Kent Land Surveys Limited | Professional & scientific | 2012 |
| Kent Museum of the Moving Image Community Interest Company | Education | 2012 |
| Kent Opulent Interior Ltd Ltd | Construction | 2024 |
| Kent Yuth in Europe CIC | Information & communication | 2016 |
| Kenton Rentals Limited | Real estate | 2021 |
| Kevin Watson Carpentry Limited | Construction | 2015 |
| Keystone Groundworks & Civils Limited | Construction | 2026 |
| Keziahanne Ltd | Arts & recreation | 2023 |
| Kingsdown Electrical Limited | Construction | 2023 |
| Kingsdown Properties Ltd | Real estate | 2023 |
| Kingsdown Rings Ltd | Wholesale & retail | 2026 |
| Kingsmoor Knight Property MGE Co Ltd | Real estate | 2020 |
| Kingsnorth Consultants Ltd | Administrative & support | 2025 |
| Kinobi Design Ltd | Manufacturing | 2020 |
| Kirkpatrick Consulting Limited | Professional & scientific | 2016 |
| Kitchen Fits & Wraps Ltd | Construction | 2021 |
| Kitney Building Services Ltd | Construction | 2023 |
| Kitzbuhel Information Technology Limited | Information & communication | 2026 |
| Kllm Construction Ltd | Construction | 2025 |
| Knighton Towage and Salvage Ltd | Transport & logistics | 2022 |
| Knokkout Sports Ltd | Wholesale & retail | 2025 |
| Know the Way Limited | Information & communication | 2018 |
| Knowledgetrak Limited | Professional & scientific | 2012 |
| Kobel Consultancy Limited | Professional & scientific | 2021 |
| KS Painting & Decorating Ltd | Construction | 2011 |
| Kssr Convenience Store Ltd | Wholesale & retail | 2024 |
| KT Kent Catering Ltd | Hospitality | 2026 |
| Kulik Selzer Ltd | Wholesale & retail | 2018 |
| Kumamaki Ltd | Information & communication | 2024 |
| KW Fire & Security Ltd | Administrative & support | 2023 |
| L.E. Cranes Ltd | Wholesale & retail | 2012 |
| LA Bella Sicilia Ltd | Hospitality | 2023 |
| LAB Plastering Limited | Construction | 2016 |
| Laburnum Road Residents Management Company Limited | Real estate | 2024 |
| Laing Property Rentals Limited | Real estate | 2012 |
| Lakedrive Limited | Construction | 1999 |
| Langford Homes and Lettings Limited | Real estate | 2024 |
| Lapin Ltd | Manufacturing | 2024 |
| Lavender and Blackberry of Deal Limited | Wholesale & retail | 2023 |
| Lawn Road (Walmer) Management Company Ltd | Households | 2019 |
| LCW Enterprises Ltd | Arts & recreation | 2025 |
| LE Crabe Industries Limited | Manufacturing | 2025 |
| Leaps and Bounds Community Project | Education | 2013 |
| Ledger Farms Limited | Agriculture & fishing | 1991 |
| LEE Electric Ltd | Professional & scientific | 2015 |
| LEE Ryan Legacy Ltd | Other services | 2026 |
| Lemongrass Thai Food Limited | Hospitality | 2023 |
| LEO Film and TV Production Ltd | Information & communication | 2022 |
| Lewknor House Limited | Real estate | 2021 |
| Lewknor Lodge Limited | Real estate | 2021 |
| Libertarian Alliance Ltd. | Information & communication | 1982 |
| Liberty Circle Limited | Professional & scientific | 2015 |
| Lina Patchwork Ltd | Manufacturing | 2013 |
| Lindare Medical Limited | Health & social care | 1998 |
| Linden Hall Studio Ltd | Arts & recreation | 2014 |
| Linwood Terrace Mill Road Deal Management Company Limited | Households | 2018 |
| Lion International Trade Import&Export Ltd | Wholesale & retail | 2025 |
| Lisa Caring Ltd | Health & social care | 2023 |
| Little Explorers Adventures Ltd | Education | 2021 |
| Little Haven Garden Design Limited | Professional & scientific | 2026 |
| Little Kingdom Media Ltd | Information & communication | 2024 |
| Little Mongeham Limited | Agriculture & fishing | 1991 |
| Littleoak Services Limited | Administrative & support | 2003 |