| Holdout Ltd | Information & communication | 2023 |
| Hollinrake Creative Limited | Information & communication | 2020 |
| Holm Capital Ltd | Financial services | 2020 |
| Home English Ltd | Education | 2023 |
| Homefront Construction Limited | Construction | 2019 |
| Homeland Business & Residential Agency Limited | Real estate | 1990 |
| Homewood Baird Ltd | Professional & scientific | 2024 |
| Honour Construction Ltd | Construction | 2014 |
| Hopker IT Solutions Ltd | Information & communication | 2022 |
| Horizon Highgate Limited | Households | 2018 |
| Horizonscan Limited | Professional & scientific | 2012 |
| Horizonscan Trustees Limited | Administrative & support | 2020 |
| House & Home Ltd | Construction | 2025 |
| House of Luck Ltd | Arts & recreation | 2026 |
| House Sale Solutions Ltd | Financial services | 2017 |
| Howe Heating Limited | Construction | 2024 |
| HPE Services (Kent) Ltd | Construction | 2026 |
| HR by Hannah Limited | Administrative & support | 2025 |
| HUI Tang Ltd | Hospitality | 2026 |
| Human Intelligence Ltd | Information & communication | 2026 |
| Humanity’S Reconciliation Coalition Ltd | Professional & scientific | 2025 |
| Hume Holdings Limited | Professional & scientific | 2019 |
| Hunter's Transport Limited | Transport & logistics | 2026 |
| HVH Homes Ltd | Administrative & support | 2026 |
| I AM Here NOW Ltd | Administrative & support | 2021 |
| I Live International Ltd | Other services | 2018 |
| I2PROPERTIES Limited | Real estate | 2024 |
| Iaminhere Ltd | Professional & scientific | 2017 |
| Ibake Limited | Manufacturing | 2020 |
| Ideal Glazing (Kent) Limited | Construction | 2024 |
| IKE Okorocha Ltd | Health & social care | 2007 |
| Ilifesave Ltd | Professional & scientific | 2023 |
| Illumiscape Ltd | Arts & recreation | 2024 |
| Imardex Ltd | Other services | 2018 |
| Immanuel Physio Services Ltd | Health & social care | 2014 |
| Imperative 42 Limited | Financial services | 2022 |
| Imperial N16 Ltd | Households | 2023 |
| Index Consultants Ltd | Professional & scientific | 2023 |
| Indigo Charlie Advisory Limited | Professional & scientific | 2021 |
| Indigo Charlie Design Limited | Wholesale & retail | 2014 |
| Indigo Eight Creative Limited | Professional & scientific | 2009 |
| Industrial Components (UK) Limited | Manufacturing | 2010 |
| Ingrid Miles Limited | Wholesale & retail | 2025 |
| Inink Limited | Administrative & support | 2023 |
| Insignia Decorating Limited | Construction | 2021 |
| Inspiration Creative C.I.C. | Education | 2016 |
| Inspire (C & a) Ltd | Wholesale & retail | 2020 |
| Inspired Acquisitions Limited | Real estate | 2013 |
| Inspired House Ltd | Real estate | 2020 |
| International Language Homestays Limited | Education | 2012 |
| International Wigs & Pieces Ltd | Other services | 2014 |
| Investment AF Ltd | Real estate | 2021 |
| Invictus Site Engineering Ltd | Construction | 2016 |
| IPS Procurement Services Ltd | Wholesale & retail | 2026 |
| Island Holdings Limited | Administrative & support | 1967 |
| IT Bespoke 4U Ltd | Information & communication | 2021 |
| Iveswood Ltd | Construction | 2017 |
| IVO Building Solutions Ltd | Construction | 2015 |
| J & N Contractors (Kent) Ltd | Construction | 2005 |
| J and S Holdings Kent Limited | Financial services | 2024 |
| J C Morrison a Ltd | Wholesale & retail | 2026 |
| J C Morrison Holdings Ltd | Financial services | 2026 |
| J C Morrison LLP | | 2011 |
| J P Hale Ltd | Construction | 2020 |
| J Prentis Greengrocers Limited | Wholesale & retail | 2002 |
| J Rospo Building Contractors Limited | Construction | 2008 |
| J W Sign Services Limited | Construction | 2005 |
| J&Lin Ltd | Hospitality | 2026 |
| J&M Bathrooms Limited | Construction | 2019 |
| Jackson Goldwater Consulting Limited | Wholesale & retail | 2015 |
| James Marine Engineering Limited | Administrative & support | 2017 |
| Jamie Tucker Media Ltd | Information & communication | 2019 |
| Janus Property Limited | Administrative & support | 2004 |
| Japanologie Ltd | Wholesale & retail | 2026 |
| Jasmine Beckford Ltd | Administrative & support | 2020 |
| Jaspe Ltd | Education | 2024 |
| Jay's Spark Ltd | Hospitality | 2025 |
| Jaykayglobal Ltd | Professional & scientific | 2024 |
| Jcardno Haulage Ltd | Transport & logistics | 2019 |
| Jckh Ltd | Other services | 2016 |
| Jcom Ltd | Financial services | 2020 |
| JCW Damp / Flat Roofs Ltd | Construction | 2026 |
| JD Broadstairs Ltd | Health & social care | 2024 |
| JDS Carpentry & Joinery Ltd | Manufacturing | 2023 |
| JDW Sports & Entertainment Ltd | Arts & recreation | 2018 |
| JEB Residential Ltd | Real estate | 2021 |
| Jerc Ltd | Households | 2021 |
| Jeremy Giles LLP | | 2006 |
| Jieli (UK) Limited | Wholesale & retail | 2013 |
| Jistt Enterprises Ltd | Real estate | 2022 |
| JJS Construction Group Ltd | Construction | 2024 |
| JM Tuppence Limited | Hospitality | 2018 |
| JO Lewis Works Ltd | Professional & scientific | 2021 |
| Jo-Ann's Court Limited | Households | 1996 |
| JOE Hallgate Limited | Information & communication | 2026 |
| John Couzens Roofing LLP | | 2021 |
| Johnsons Developments South East Limited | Construction | 2021 |
| Johnsons Holdings South East Limited | Financial services | 2018 |
| Johnsons Investments South East Limited | Real estate | 2018 |
| Jonathan House RTM Company Limited | Households | 2016 |