| Hexis Training Limited | Mining & quarrying | 2020 |
| HEY Yampos Limited | Information & communication | 2024 |
| Heywood Home Improvements Ltd | Construction | 2012 |
| HGW Building Services Limited | Construction | 2014 |
| HH Beales Ltd | Construction | 2023 |
| HIAWATHA168 Limited | Construction | 2016 |
| HIC Property Services Ltd | Real estate | 2016 |
| High Point Cleaning Limited | Administrative & support | 2012 |
| High Street Mini Market Ltd | Wholesale & retail | 2025 |
| Hirst Farms Limited | Agriculture & fishing | 1960 |
| Hirst Liveries and Sport Horses LLP | | 2022 |
| Hitec Products (U.K.) Limited | Professional & scientific | 2024 |
| Hivecode Ltd | Information & communication | 2022 |
| HK Engineering Services Ltd | Information & communication | 2018 |
| HMS Hinchinbrook (Great Yarmouth) Limited | Hospitality | 2020 |
| Hnrr Services Limited | Professional & scientific | 2025 |
| Hobland Pet Hotel & Spa Ltd | Other services | 2015 |
| Hobland Properties Ltd | Real estate | 2005 |
| Hocus Pocus Theatre CIC | Education | 2025 |
| Hodgins Rope Access Limited | Other services | 2017 |
| Hohs Holdings Ltd | Professional & scientific | 2013 |
| Holeglobe Investments Limited | Real estate | 1963 |
| Holicater Properties Limited | Real estate | 2008 |
| Holkham (UK) Limited | Arts & recreation | 2007 |
| Hollowdale Developments Limited | Real estate | 2019 |
| Holmes Wharf Limited | Real estate | 2008 |
| Home Education Hotspots Ltd | Information & communication | 2025 |
| Home Farm Barns (Thurne) Limited | Construction | 2025 |
| Home Improvement Centre EA Limited | Wholesale & retail | 2020 |
| Home Radiology Ltd | Information & communication | 2023 |
| Home Stylz Limited | Wholesale & retail | 2022 |
| Homestead Gardens Holidays Ltd | Hospitality | 2024 |
| Hometech (East Anglia) Ltd | Administrative & support | 2010 |
| Hopton Electrical Ltd | Construction | 2026 |
| Horatio House Voiceover Ltd | Information & communication | 2025 |
| Horizon College London Limited | Education | 2025 |
| Horizon Community Investment Ltd | Real estate | 2024 |
| Horizon Community Training CIC | Education | 2021 |
| Horizon Geosciences Limited | Professional & scientific | 2013 |
| Horizon MOT Centre Ltd | Wholesale & retail | 2014 |
| Horseexpress Ltd | Transport & logistics | 2026 |
| Horsell Motor Company Limited | Wholesale & retail | 2019 |
| Horsley & Horsley Ltd | Real estate | 2020 |
| Hot Engineering Services Ltd | Professional & scientific | 2024 |
| Hot Styx Ltd | Hospitality | 2023 |
| Hotels by K Opus Ltd | Hospitality | 2022 |
| Hourglass Language Services Ltd | Professional & scientific | 2022 |
| Household Cravings Ltd | Wholesale & retail | 2021 |
| Howzes 2 Homez Limited | Construction | 2006 |
| Hppt PEP Limited | Health & social care | 2022 |
| HQ Estates Limited | Mining & quarrying | 2019 |
| Hrsdc Ltd | Professional & scientific | 2023 |
| HSEQ-360 Limited | Professional & scientific | 2019 |
| HTJ Business Consultants Ltd | Professional & scientific | 2019 |
| Hubbard Homes Ltd | Real estate | 2025 |
| Hubble and Company Limited | Wholesale & retail | 1988 |
| Hudson Homes Norfolk Ltd | Real estate | 2024 |
| Huff Duff Fishing Limited | Agriculture & fishing | 2020 |
| Huff Duff Holdings Limited | Financial services | 2025 |
| Hunn & Co Letting Agents Limited | Real estate | 2012 |
| Hunn Security & Fire Limited | Administrative & support | 2024 |
| Hunt Energy Ltd | Construction | 2022 |
| Hunt&Oak Limited | Extraterritorial | 2017 |
| Hunter Brand Limited | Wholesale & retail | 2014 |
| Hunter U.K. Ltd | Wholesale & retail | 2017 |
| Hunters Vehicle Dismantlers Ltd | Wholesale & retail | 2018 |
| Hunts Services Ltd | Other services | 2018 |
| Hurricane Fencing Ltd | Administrative & support | 2025 |
| Hurst Family International Limited | Manufacturing | 1990 |
| Hurston Assets Limited | Financial services | 2019 |
| Hutchysmedia Limited | Professional & scientific | 2026 |
| Huxley Land Limited | Administrative & support | 2007 |
| HW Centre Limited | Health & social care | 2021 |
| Hy-Tek Enterprises Limited | Professional & scientific | 2012 |
| Hybrid Resource Management Limited | Administrative & support | 2019 |
| Hybrid Tech Ltd | Information & communication | 2022 |
| Hydramec Offshore Hydraulic Systems Limited | Manufacturing | 2002 |
| Hydro Roof Clean Ltd | Construction | 2010 |
| Hyperfusion Investments Ltd | Real estate | 2020 |
| Hyperfusion Limited | Manufacturing | 2015 |
| Hyphen Advisory Ltd | Professional & scientific | 2024 |
| I Click Media Ltd | Wholesale & retail | 2009 |
| I Love My Pets Ltd | Wholesale & retail | 2021 |
| I Want That One Ltd | Real estate | 2022 |
| I Warehouse Limited | Wholesale & retail | 2013 |
| I.T. Excellence Limited | Education | 1998 |
| IAN Hudson Wealth Management Ltd | Other services | 2015 |
| IAN Kinge Logistics Ltd | Mining & quarrying | 2021 |
| IAN Linnett Electrical Ltd | Construction | 2019 |
| IC Aesthetics Ltd | Other services | 2020 |
| Ic-Repairs (UK) Limited | Wholesale & retail | 2009 |
| Ice Housing Ltd | Real estate | 2025 |
| Iceni Resources Ltd | Education | 2021 |
| ID Jenkins Services Ltd | Health & social care | 2023 |
| IDC Construction (East Anglia) Ltd | Construction | 2015 |
| Ideal Staffing Limited | Administrative & support | 2024 |
| Ideatronix Ltd | Information & communication | 2023 |
| Ifgc Property Ltd | Real estate | 2024 |
| Igaming Media Ltd | Professional & scientific | 2025 |
| IGK Avia Ltd | Transport & logistics | 2017 |