| Healthvia System Limited | Public administration | 2025 |
| Healthy Fundamentals Ltd | Health & social care | 2022 |
| Heatcore Boiler Servicing Ltd | Construction | 2026 |
| Heath House (Frimley Green) Management Limited | Households | 2007 |
| Heather Court Management Company (Aldershot) Limited | Households | 1965 |
| Hedgehogg Services Limited | Arts & recreation | 2021 |
| Helios Technology Limited | Professional & scientific | 1996 |
| Hello Gorgeous Photography Limited | Professional & scientific | 2018 |
| Hemp Higher Limited | Manufacturing | 2020 |
| Henden Financial Limited | Financial services | 2015 |
| Henvic Services Ltd Limited | Transport & logistics | 2025 |
| Hercules Property Co (UK) Limited | Real estate | 2010 |
| HERITAGE2CULTURE Ltd | Professional & scientific | 2019 |
| Herrington Carmichael LLP | | 2006 |
| Herrington Carmichael Trust Corporation Limited | Administrative & support | 2019 |
| Heskfield Properties Limited | Administrative & support | 1999 |
| Heydoc Locums Solution Ltd | Professional & scientific | 2018 |
| HGV Nationwide Ltd | Administrative & support | 2026 |
| Hi-Tech Independent Solutions Private Limited | Information & communication | 2018 |
| Higgys (Hvac) Ltd | Construction | 2025 |
| High Quality Joinery Limited | Manufacturing | 1972 |
| Highfields Digital Health Consulting Ltd | Professional & scientific | 2023 |
| Highgate Court Management Company Limited | Hospitality | 1976 |
| Highline Carpentry Ltd | Manufacturing | 2019 |
| Hilary's Hounds Ltd | Wholesale & retail | 2024 |
| Hill Brow Group Limited | Professional & scientific | 2008 |
| Himalaya Supplier Ltd | Wholesale & retail | 2011 |
| Himley & HER Limited | Administrative & support | 2018 |
| Histon-Allvey Limited | Professional & scientific | 1999 |
| Hitmaker Limited | Information & communication | 2012 |
| HK Management Consultancy Ltd | Information & communication | 2021 |
| HMG Aerospace Ltd | Information & communication | 2009 |
| HMS Plumbers Limited | Construction | 2010 |
| HNN Taxi Ltd | Transport & logistics | 2025 |
| Hobb's Financial Solutions Ltd | Financial services | 2024 |
| Hobbs & Gray Security Ltd | Administrative & support | 2021 |
| Hogarth Fine Art Lighting Ltd | Wholesale & retail | 2010 |
| Hogwood Garage Limited | Manufacturing | 2015 |
| Holiday Rentals (Brighton) Ltd | Real estate | 2022 |
| Holmbrook Design Services Limited | Professional & scientific | 2012 |
| Holmes Consultancy and Procurement Limited | Professional & scientific | 2010 |
| Home BEE Appliances Ltd | Wholesale & retail | 2022 |
| Home Suite Home Estates Ltd | Real estate | 2023 |
| Homease Zone Limited | Wholesale & retail | 2020 |
| Honney Valleting Centre Ltd | Other services | 2015 |
| Honoly Group Ltd | Financial services | 2022 |
| Hook & Odiham Rugby Football Club Ltd | Arts & recreation | 2025 |
| Hoopers' Tutors Limited | Education | 2011 |
| Horizon ARB Limited | Administrative & support | 2024 |
| Hosa Logistics Limited | Transport & logistics | 2017 |
| Hospitality Solutions Group Limited | Information & communication | 2019 |
| Hot Property Management Ltd | Real estate | 2015 |
| Hotelplan (Transport) Ltd. | Administrative & support | 1994 |
| Hotelplan (U.K. Group) Limited | Professional & scientific | 1947 |
| Hotelplan Limited | Administrative & support | 1939 |
| Hotwater Plumbing & Heating Ltd | Construction | 2014 |
| Housework Purple Hands Ltd | Administrative & support | 2001 |
| Hoyland Consultants Limited | Professional & scientific | 2011 |
| Hsbi Ltd | Information & communication | 2021 |
| Huda Lighting UK Ltd | Professional & scientific | 2025 |
| HUE Studios Ltd | Professional & scientific | 2018 |
| Hunt and Palmer Cargo Charters Ltd | Transport & logistics | 1989 |
| Hunt and Palmer Ltd | Transport & logistics | 1986 |
| Hunt Motor Group Limited | Wholesale & retail | 2023 |
| Huon Developments Ltd | Construction | 2026 |
| Hurst Gate Homes Limited | Construction | 2018 |
| Hurst Gate Place Limited | Construction | 2025 |
| Husian Ltd | Information & communication | 2017 |
| Hussain & Mihr Ltd | Wholesale & retail | 2025 |
| Hustle + Hush Ltd | Professional & scientific | 2017 |
| HV LV Vector Group Ltd | Manufacturing | 2025 |
| Hydravex Limited | Construction | 2022 |
| Hyperion Infrastructure Consultancy Ltd | Professional & scientific | 2012 |
| Hyperion Tiles Ltd | Wholesale & retail | 2011 |
| Hypershift Games Ltd | Information & communication | 2024 |
| Hyphen Consultants Limited | Professional & scientific | 2023 |
| I & B Partners Limited | Wholesale & retail | 2023 |
| I & C Communications Ltd | Information & communication | 2014 |
| I D H Solutions Ltd | Information & communication | 2014 |
| I&N Lettings Ltd | Real estate | 2024 |
| I-Care Heating Ltd | Construction | 2022 |
| I-Neda Ltd | Information & communication | 2002 |
| I.K. Technology Ltd | Professional & scientific | 2001 |
| I.S. Pro Performance Group Limited | Education | 2025 |
| I.S. Pro Performance Limited | Education | 2025 |
| I6 Clouds Limited | Extraterritorial | 2015 |
| I6 Group Limited | Professional & scientific | 2015 |
| I6 Limited | Extraterritorial | 2021 |
| I6 Marine Limited | Extraterritorial | 2015 |
| I6 Military Limited | Extraterritorial | 2015 |
| I6 Optimise Limited | Extraterritorial | 2015 |
| I6 Refuel Limited | Extraterritorial | 2015 |
| I6 Systems Limited | Manufacturing | 2013 |
| IAB Build Ltd | Construction | 2023 |
| Iamdev Ltd | Information & communication | 2018 |
| IAN Mowbray Golf Retail Ltd | Wholesale & retail | 2004 |
| IB Bioinvest Limited | Professional & scientific | 2023 |
| IBD Women Ltd | Professional & scientific | 2021 |
| IC Frith Service Contracts Limited | Financial services | 2024 |
| Iceberg Civil Engineering Ltd | Construction | 2016 |