| HJW Consulting Ltd | Information & communication | 2021 |
| HLC Construction and Consultancy Ltd | Construction | 2024 |
| HN Beauty & Wellness Store Ltd | Wholesale & retail | 2024 |
| Hodges and Andrews Limited | Real estate | 1979 |
| Holiday Homes Services (HHS) Limited | Real estate | 2013 |
| Holland House Hotel (Margate) Limited | Real estate | 1965 |
| Holroyd Homes and Construction Ltd | Construction | 2021 |
| Home Heroes Limited | Construction | 2012 |
| Home Matters (SW) Ltd | Real estate | 2024 |
| Homesurveysolutions Ltd | Construction | 2020 |
| Hopewings Global Ltd | Administrative & support | 2023 |
| Horizon Counselling and Coaching Limited | Health & social care | 2021 |
| Horizon Hunters Ltd | Administrative & support | 2023 |
| Hornby Hobbies Limited | Manufacturing | 1986 |
| Hornby Industries Limited | Manufacturing | 1980 |
| Hornby Limited | Manufacturing | 1981 |
| Hornby World Limited | Manufacturing | 2022 |
| Horse Race Feeds Ltd | Wholesale & retail | 2018 |
| Horus Kent Ltd | Health & social care | 2020 |
| Hot Spot Youth | Education | 2011 |
| Hot Wood Ltd | Hospitality | 2019 |
| Hotpod Yoga Margate Limited | Arts & recreation | 2017 |
| House De'Ville Ltd | Wholesale & retail | 2022 |
| House of BOP Ltd | Arts & recreation | 2018 |
| House of Margate Limited | Wholesale & retail | 2024 |
| House of Neve Ltd | Manufacturing | 2021 |
| Houses for Hire Limited | Real estate | 2019 |
| Howe Homes Ltd | Construction | 2025 |
| Howiya Ltd | Wholesale & retail | 2024 |
| Howsego Ltd | Information & communication | 2023 |
| HS Homes Doncaster Ltd | Real estate | 2024 |
| HSB Contractors Ltd | Construction | 2023 |
| Htsignalling Limited | Transport & logistics | 2018 |
| Hudson Floyd Beauty Limited | Other services | 2026 |
| Hudson Floyd Hair Limited | Other services | 2026 |
| Hugco Holding Limited | Financial services | 2023 |
| Hugco HQ Limited | Real estate | 2023 |
| Hugco Ltd | Professional & scientific | 2021 |
| Hughes&Sons Logistics Ltd | Transport & logistics | 2019 |
| Hughie Gavin Music Ltd | Arts & recreation | 2024 |
| Hugo Dyer Estates Limited | Real estate | 2020 |
| Hutch Surveying Limited | Construction | 2024 |
| HV Access Limited | Other services | 2016 |
| Hyperlocal Media Ltd | Information & communication | 2025 |
| Hythe Takeaway Ltd | Hospitality | 2019 |
| I Create Experience Ltd | Extraterritorial | 2018 |
| I Work in Payments Limited | Administrative & support | 2016 |
| Ibonn International Limited | Other services | 2019 |
| Ibwmb Theatre Company Limited | Arts & recreation | 2016 |
| IC3 Vault Limited | Wholesale & retail | 2020 |
| Ice Cream N Shout Limited | Professional & scientific | 2020 |
| IF Destroyed Still True Ltd. | Professional & scientific | 2015 |
| IGL Properties Ltd | Real estate | 2026 |
| Ignition Media Limited | Information & communication | 2017 |
| IJF Holdings Limited | Real estate | 2022 |
| Iliving Asset Management Limited | Financial services | 2020 |
| Iliving Capital 111 Limited | Real estate | 2020 |
| Iliving Capital 222 Limited | Real estate | 2026 |
| Iliving Capital 333 Limited | Real estate | 2021 |
| Iliving Capital Limited | Real estate | 2020 |
| Iliving Holdings Limited | Real estate | 2020 |
| Imoveanycar Limited | Transport & logistics | 2025 |
| Impeller Pumps Limited | Manufacturing | 2025 |
| Imperial Bar & Meze Kitchen Ltd | Hospitality | 2019 |
| Imperial Rigging Services Ltd | Administrative & support | 2013 |
| Imperion Chauffeur Ltd | Transport & logistics | 2026 |
| Imperium Business Intelligence Ltd | Information & communication | 2019 |
| Imperium Dwellings 2 Ltd | Real estate | 2026 |
| Imperium Dwellings 3 Ltd | Real estate | 2026 |
| Imperium Property Advisory 2 Ltd | Real estate | 2023 |
| Impjar Eliquid Ltd | Wholesale & retail | 2022 |
| Incasso Limited | Wholesale & retail | 2022 |
| Independent Pharma Consultants Limited | Professional & scientific | 2005 |
| Indie Clinic Media Ltd | Arts & recreation | 2024 |
| Indigo KIN Ltd | Information & communication | 2023 |
| Infinity Code Software Ltd | Information & communication | 2021 |
| Inflo Systems Ltd | Professional & scientific | 2013 |
| Iniya & Iniyan Ltd | Real estate | 2025 |
| Innstore Limited | Wholesale & retail | 2020 |
| Inspired Solution South East Ltd | Construction | 2014 |
| Inspired Solutions Investments Ltd | Financial services | 2024 |
| Inspired Solutions Services Ltd | Construction | 2019 |
| Inspired Solutions Works Division Ltd | Construction | 2014 |
| Instamech Electrical Services Limited | Construction | 2015 |
| Institute of ST. Anselm(The) | Education | 1986 |
| INT Payment Services Ltd | Information & communication | 2018 |
| Integrate Electrical Ltd | Construction | 2019 |
| Integrated Eco Systems Limited | Information & communication | 2006 |
| International Offshore Energy Services Ltd | Professional & scientific | 2022 |
| Internet Business Academy Inc. Ltd | Information & communication | 2019 |
| Intheday Ltd | Information & communication | 2020 |
| Intonum Ltd. | Professional & scientific | 2019 |
| Invicta Worldwide Group Limited | Administrative & support | 2011 |
| Invicta Worldwide Holdings Limited | Financial services | 2023 |
| Ionexchange Ltd | Wholesale & retail | 2025 |
| Ireland West Healtcare Ltd | Health & social care | 2016 |
| Irepair Kent Ltd | Wholesale & retail | 2019 |
| ISA in (UK) Limited | Real estate | 2010 |
| Island & County Estates Limited | Real estate | 1995 |
| Island Road Garage Ltd | Wholesale & retail | 2020 |