| Hold a Corner Ltd | Administrative & support | 2023 |
| Holding Key Business Ltd | Wholesale & retail | 2025 |
| Hollands Creative and Strong Ltd | Arts & recreation | 2026 |
| Hollands Strength and Conditioning Ltd | Arts & recreation | 2021 |
| Hollisters (Electrical Contractors) Limited | Construction | 1953 |
| Hollisters Electrical Limited | Construction | 2009 |
| Hollyridge Management Limited | Real estate | 2005 |
| Hollywood Aesthetics & Training Ltd | Education | 2023 |
| Hollywood Developments Ltd | Administrative & support | 2020 |
| Holman's Electrical Ltd | Construction | 2023 |
| Holmwood Company (Siosal) Limited | Financial services | 2019 |
| Holt Developments (Essex) Limited | Construction | 2023 |
| Home From Home (Kent) Limited | Hospitality | 2018 |
| Home Security Systems Ltd | Construction | 2025 |
| Home Staging HQ Limited | Professional & scientific | 2025 |
| Home Visit Pet Care Medway & Gravesend Ltd | Professional & scientific | 2026 |
| HOME4SURE Ltd | Health & social care | 2022 |
| Homelyhavens Ltd | Real estate | 2023 |
| Homeopathyaq Ltd | Health & social care | 2025 |
| Homestudiouser Ltd | Information & communication | 2025 |
| Hommies in Jannah Tour and Travel Ltd | Administrative & support | 2024 |
| HOO Catering Ltd | Hospitality | 2026 |
| HOO Construction Limited | Construction | 2026 |
| HOO Dental Care Limited | Health & social care | 2010 |
| HOO Peninsula Cares Community Interest Company | Health & social care | 2015 |
| HOO Property Holdings Limited | Real estate | 2022 |
| Hook YOU UP UK Ltd | Wholesale & retail | 2023 |
| Hope Pharma Solutions Ltd | Health & social care | 2015 |
| Hopeliveheal | Information & communication | 2024 |
| Horizon Consulting Business & Management Development Limited | Professional & scientific | 2000 |
| Horizon Health Ltd | Health & social care | 2023 |
| Horton Electrical & Building Services Ltd | Construction | 2024 |
| Hose Services (Medway) Limited | Wholesale & retail | 1994 |
| Hostplace UK Limited | Wholesale & retail | 2025 |
| House for People Ltd | Real estate | 2025 |
| House of Challis Ltd | Real estate | 2024 |
| House of Davies Ltd | Hospitality | 2025 |
| House of Elliotts Limited | Wholesale & retail | 2022 |
| House of Laming-Davies Ltd | Hospitality | 2025 |
| Housequake Promotions Limited | Other services | 2025 |
| Housework Hub Limited | Households | 2016 |
| Howse’S Refrigeration Ltd | Construction | 2020 |
| HP Sound Limited | Information & communication | 2019 |
| HR Building Services South East Ltd | Construction | 2018 |
| HRF Group Ltd | Construction | 2017 |
| HRF Management Limited | Construction | 2020 |
| HRF Properties Limited | Construction | 2016 |
| Hrihorcea Holdings Limited | Real estate | 2025 |
| Hrology Limited | Professional & scientific | 2011 |
| HS Flooring Specialists Ltd | Construction | 2025 |
| HS Operations Ltd | Professional & scientific | 2026 |
| HSA Property Developers Limited | Real estate | 2025 |
| HSB Property (Kent) Ltd | Real estate | 2023 |
| Hseq Support Ltd | Professional & scientific | 2021 |
| HSF (Residents) Management Company Ltd | Households | 2025 |
| Hsquare Services Ltd | Health & social care | 2023 |
| Hudson Access Solutions Ltd | Construction | 2018 |
| Huguenot Heritage Centre | Education | 2013 |
| Human & Canine Limited | Professional & scientific | 2007 |
| Humble Abode Propco Ltd | Real estate | 2023 |
| Hummerstone & Hawkings Medway Limited | Real estate | 2024 |
| Hungry Design Ltd | Information & communication | 2022 |
| Hunter Marketing Studio Ltd | Professional & scientific | 2022 |
| Hunter Stein Construction Ltd | Construction | 2022 |
| Hunter Stein Fabric & Flooring Ltd | Construction | 2026 |
| Hunter Stein Group Ltd | Financial services | 2025 |
| Hunter Stein Ltd | Professional & scientific | 2021 |
| Huntlands Engineering Services Ltd | Professional & scientific | 2014 |
| Huntlands Property Management Ltd | Real estate | 2016 |
| Hunton Engineering Design Limited | Construction | 1998 |
| Hunton Engineering Services Limited | Construction | 2015 |
| Hunton Holdings Limited | Other services | 2007 |
| Huntsman's Close Property Company Limited(The) | Households | 1963 |
| Hurlfield (UK) Limited | Financial services | 2013 |
| Hurn Engineering Ltd | Professional & scientific | 2026 |
| Hvsm Limited | Professional & scientific | 2023 |
| HWS Grassroots Consultants Limited | Professional & scientific | 2025 |
| Hydraflex Management Services Limited | Professional & scientific | 2013 |
| Hydraflex Metal Hose & Bellows Limited | Construction | 1993 |
| Hydraflex Plumbing & Cooling Hoses Limited | Manufacturing | 1990 |
| Hydraulic & Engineering Services Limited | Manufacturing | 1991 |
| I DO & I DID Ltd | Extraterritorial | 2024 |
| I J Skinmore Ltd | Professional & scientific | 2012 |
| I K Hunter Management Ltd | Transport & logistics | 2026 |
| I M L Utilities Ltd | Construction | 2023 |
| I-Therm Thermography Limited | Professional & scientific | 2023 |
| I.B.C. Consultants Ltd | Professional & scientific | 2009 |
| I.Solveuk Ltd | Professional & scientific | 2023 |
| IAC Access Services Ltd | Construction | 2024 |
| IAM Castle Limited | Information & communication | 2026 |
| IAN G. Ross (Holdings) Limited | Professional & scientific | 1994 |
| Ibile Properties Limited | Real estate | 2023 |
| IBK Inspirations Ltd | Professional & scientific | 2013 |
| IC Presentation Ltd | Information & communication | 2024 |
| Ice Electrical Installations Ltd | Construction | 2024 |
| Icon Stone Paving Limited | Construction | 2019 |
| ID Logical Limited | Wholesale & retail | 2021 |
| Id-Jm Limited | Professional & scientific | 2019 |
| ID4 Holdings Limited | Financial services | 2025 |
| IDA Finance Limited | Administrative & support | 2017 |