| HAM Consulting Ltd | Manufacturing | 2024 |
| Handshake (Thetford) Limited | Real estate | 2025 |
| Harcourtbrook Ltd | Extraterritorial | 2022 |
| Harlen Purdey Ltd | Professional & scientific | 2023 |
| Harlequin House UK Limited | Extraterritorial | 2016 |
| Harling Wood Stud Ltd | Agriculture & fishing | 2024 |
| Harmony Upgraded Coffee Shop Ltd | Hospitality | 2025 |
| Harris Estates (Norfolk) Ltd | Real estate | 2025 |
| Harry's PIE and Mash Ltd | Hospitality | 2019 |
| Hatomi Ltd | Administrative & support | 2024 |
| Haus of Tess Ltd | Other services | 2025 |
| Havea Limited | Professional & scientific | 2022 |
| Havencroft Properties Limited | Real estate | 1996 |
| Havin's Ocean Fish Bar Ltd | Hospitality | 2019 |
| Hawk Cleaning Services Ltd | Administrative & support | 2023 |
| Hawk Security Services Ltd | Administrative & support | 2019 |
| Hawthorn Farms Limited | Real estate | 2011 |
| Hayek Parker Ltd | Professional & scientific | 2021 |
| Haykin Reinforcement Ltd | Construction | 2012 |
| Hayley Baker Hair Ltd | Other services | 2025 |
| Hayward Construction Ltd | Construction | 2019 |
| Hayward Miller Limited | Professional & scientific | 2010 |
| Hazel Dixon Nail Artist Academy Ltd | Education | 2016 |
| Hazel Dixon Nails Ltd | Wholesale & retail | 2014 |
| HD Norfolk Ltd | Other services | 2025 |
| Health & Wealth Planning Ltd | Financial services | 2025 |
| Heather Nunn Business Services Limited | Administrative & support | 2015 |
| Heathside Haven Limited | Hospitality | 2010 |
| Helps Services Network Ltd | Health & social care | 2024 |
| HEM Limited | Households | 2003 |
| HEN and Stag Retreat Ltd | Hospitality | 2021 |
| Hensby Construction Limited | Construction | 2008 |
| Hereward Sheetmetal Limited | Manufacturing | 2014 |
| HES M&E Services Ltd | Construction | 2024 |
| HES Services Ltd | Construction | 2024 |
| Heys Yard Residents Limited | Other services | 2008 |
| High END Evolution Limited | Construction | 2023 |
| High House Farm Holidays Ltd | Hospitality | 2021 |
| Highland Associates (2008) Limited | Professional & scientific | 2008 |
| Highlands Household Limited | Administrative & support | 2004 |
| Highlands International (1999) Limited | Wholesale & retail | 1999 |
| Highlands Products Limited | Professional & scientific | 2010 |
| Hijinx Ltd | Other services | 2012 |
| Hilborough Developments Limited | Construction | 1989 |
| Hilborough Farms Limited | Agriculture & fishing | 1998 |
| Hilborough Trustee Company Limited | Professional & scientific | 1997 |
| Hill-Rom Limited | Health & social care | 1988 |
| HJC Protective Coatings Ltd | Manufacturing | 2012 |
| HJG Properties (Norfolk) Limited | Real estate | 2024 |
| HNR Group Ltd | Financial services | 2025 |
| Hockham Eagle Limited | Hospitality | 2014 |
| Holland Heating and Renewables Ltd | Construction | 2026 |
| Holmes Lane Livestock Ltd | Wholesale & retail | 2021 |
| Home Farm Barns Merton Management Company Limited | Households | 2017 |
| Home Farm Park Residents Association (Great Hockham) Limited | Real estate | 2005 |
| Homeflame GAS Services Ltd | Construction | 2003 |
| Homewithcc Ltd | Wholesale & retail | 2026 |
| Horn Limited | Manufacturing | 1994 |
| Horreum Developments Ltd | Real estate | 2024 |
| House of Mutt Group Ltd | Other services | 2024 |
| House of Mutt LLP | | 2013 |
| Househire Limited | Manufacturing | 1997 |
| Howard Surveying Services Limited | Professional & scientific | 2016 |
| Hrrm Ltd | Transport & logistics | 2022 |
| HS Welding Ltd | Professional & scientific | 2024 |
| Hsns Investments Ltd | Real estate | 2025 |
| Hunter TM Ltd | Construction | 2025 |
| Huntstowe Greenacre LLP | | 2018 |
| Huntstowe Land Limited | Real estate | 2016 |
| Hutley Waste Solutions Ltd | Professional & scientific | 2025 |
| Hydrographique Limited | Arts & recreation | 2016 |
| Hypnohugs Limited | Health & social care | 2019 |
| Hypocotyl Ltd | Professional & scientific | 2025 |
| ICM Sustainable Solutions Limited | Agriculture & fishing | 2015 |
| IIO Design Limited | Other services | 2023 |
| IKU Technologies Limited | Manufacturing | 2020 |
| Illington Holdings Ltd | Financial services | 2025 |
| Imagine, Focus, Create Ltd | Health & social care | 2025 |
| Imperium Cctv & Security Solutions Ltd | Administrative & support | 2021 |
| Impulse Music Consultants LLP | | 2011 |
| IN and About Thetford Limited | Information & communication | 2014 |
| Incredible Youth Ltd | Other services | 2026 |
| Inddee Limited | Information & communication | 2019 |
| Independent Dance Training Limited | Education | 2023 |
| Independent Leisure Equipment Ltd | Administrative & support | 2021 |
| Independent Leisure Services LLP | | 2023 |
| Independent Vegetable Processors Limited | | 1974 |
| Innovator Consultancy Ltd | Professional & scientific | 2022 |
| Instinctively Mystical Limited | Wholesale & retail | 2024 |
| Intelli Heat Limited | Wholesale & retail | 2006 |
| Intelligent Omics Limited | Professional & scientific | 2008 |
| Interconnect Design Services Limited | Information & communication | 2007 |
| Interim & Management Services Ltd | Professional & scientific | 2020 |
| Interim QP Limited | Professional & scientific | 2010 |
| Invatel Group Limited | Extraterritorial | 2016 |
| Involve Razem Community Interest Company | Education | 2016 |
| Invulnerables Esports Ltd | Arts & recreation | 2020 |
| Iris Photo UK Ltd | Professional & scientific | 2025 |
| ITB Consultants Ltd | Professional & scientific | 2025 |
| IV Distribution (EN) Limited | Wholesale & retail | 2022 |