| Haulage by D.J Ltd | Transport & logistics | 2024 |
| Havennacare C.I.C. | Public administration | 2026 |
| Hawc Ltd | Other services | 2024 |
| Hawes Properties Limited | Real estate | 2025 |
| Hawk Fabrications Limited | Professional & scientific | 2025 |
| Hawks Restaurant & Bar Ltd | Hospitality | 2019 |
| Hawthorne Farm Wisbech Ltd | Hospitality | 2021 |
| Hawthorne Gardens Residents Management Company Limited | Households | 2019 |
| HBS Access Services Ltd | Extraterritorial | 2023 |
| HBS Electrical Services Ltd. | Manufacturing | 2018 |
| HD Optics Ltd | Wholesale & retail | 2017 |
| Heacham Holidays Limited | Hospitality | 1989 |
| Health Solutions Ltd | Professional & scientific | 2024 |
| Healthy Haven Care Services Ltd | Health & social care | 2024 |
| Hearth Holdings & Investments Ltd | Financial services | 2025 |
| Heating & Plumbing Services (Wisbech) Limited | Construction | 2007 |
| Heatwave UK Limited | Construction | 2005 |
| Hello Friends Norfolk Limited | Health & social care | 2023 |
| Hemingford Plants Limited | Wholesale & retail | 2014 |
| Hemisphere Financial Limited | Financial services | 2014 |
| Hennex Limited | Professional & scientific | 2024 |
| Henry's Local Store Ltd | Wholesale & retail | 2026 |
| Heracles Nutrition Ltd | Wholesale & retail | 2025 |
| Herbert & SON (Farmers) Limited | Agriculture & fishing | 1958 |
| Hereward Developments Limited | Construction | 2017 |
| Hereward Services Limited | Professional & scientific | 2016 |
| Heritage Build (Cambs) Limited | Construction | 2025 |
| Heritage Picture Framing Services Ltd | Manufacturing | 2014 |
| Heroes (UK) Limited | Wholesale & retail | 2004 |
| Hevallo Limited | Real estate | 2021 |
| Hevy Barbers Ltd | Other services | 2021 |
| Hexa Construction Limited | Construction | 2026 |
| HFA (Health for ALL) Ltd | Health & social care | 2020 |
| HFA Properties Ltd | Real estate | 2021 |
| HGV Tech Limited | Wholesale & retail | 2025 |
| HH Wisbech Ltd | Hospitality | 2023 |
| HHA Grounds Maintenance Limited | Administrative & support | 2014 |
| Hi-Lettings Ltd | Real estate | 2018 |
| Hi-Tech Diagnostic & Repair Limited | Wholesale & retail | 2025 |
| Hidden Beauty Room Ltd | Other services | 2025 |
| High Voltage Asset Installation Limited | Construction | 2024 |
| High Voltage Electrical Consultants Ltd | Construction | 2018 |
| Hill House Farms Limited | Agriculture & fishing | 1953 |
| Hillfox International Limited | Professional & scientific | 2007 |
| Hillfox Systems Ltd | Financial services | 2019 |
| Hinode Autos Limited | Wholesale & retail | 2022 |
| Hinson Electrical Contractors Limited | Construction | 2023 |
| Hire a Handyman Ltd | Construction | 2023 |
| HJH Enterprises Limited | Financial services | 2024 |
| HJW Groundworks UK Ltd | Extraterritorial | 2025 |
| HK Taverns Ltd | Hospitality | 2022 |
| HKR Services Norfolk Ltd | Transport & logistics | 2024 |
| HL & RV Anderson Limited | Transport & logistics | 2012 |
| HL Interiors Limited | Construction | 2016 |
| HL Property Developments Ltd | Real estate | 2025 |
| HL Property Group Ltd | Financial services | 2025 |
| Hobday Eventing Limited | Arts & recreation | 2016 |
| Hoffhaus Design Limited | Professional & scientific | 2014 |
| HOG Roast Catering Company Ltd | Hospitality | 2012 |
| Holland Hospitality (Cambridge) Ltd | Hospitality | 2020 |
| Holland Hospitality (Chippenham) Ltd | Hospitality | 2023 |
| Holland Hospitality Fincham Ltd | Hospitality | 2025 |
| Holmebrink Construction Limited | Construction | 2015 |
| Holmebrink Holdings Limited | Financial services | 2015 |
| Holttum Consulting & Project Management Ltd | Professional & scientific | 2023 |
| Holywell Health Limited | Health & social care | 2019 |
| Homestone Limited | Real estate | 1989 |
| Honey Hive Group Ltd | Financial services | 2023 |
| Horizon East Anglia Ltd | Administrative & support | 2025 |
| Horse Shaman Ltd | Professional & scientific | 2025 |
| Hosier Elite Transfers Ltd | Transport & logistics | 2025 |
| Hosier Xecutive Limited | Transport & logistics | 2022 |
| Hostmoor Contracting Ltd | Manufacturing | 2024 |
| Hot & Spicy Fastfood (Wisbech) Ltd | Hospitality | 2025 |
| Hourglass Escapes Ltd | Arts & recreation | 2019 |
| Howard Plastering Contractors Limited | Construction | 2005 |
| Howell Race Engineering Ltd | Manufacturing | 2013 |
| Howlers Doggie Daycare Limited | Other services | 2025 |
| HPA Project Logistics Limited | Transport & logistics | 2016 |
| Hsmad & Associates Limited | Professional & scientific | 2004 |
| HUB4PARTS Ltd | Wholesale & retail | 2016 |
| HUB4PETPENS Limited | Extraterritorial | 2021 |
| Hubbard Holdings Ltd | Financial services | 2023 |
| Humberstone Tree Co Limited | Construction | 2024 |
| Humble Beginnings Properties Limited | Real estate | 2024 |
| Hunns Group Ltd | Manufacturing | 2022 |
| Hunter Parker Ltd | Administrative & support | 2022 |
| Hunters & Gatherers Limited | Professional & scientific | 2004 |
| Hutchinson Group Limited | Agriculture & fishing | 2003 |
| Huverba (UK) Limited | Extraterritorial | 1997 |
| HUW Thomas Associates Ltd | Information & communication | 2025 |
| Hybrid Archery Ltd | Arts & recreation | 2020 |
| Hyde Park Solutions Global Limited | Financial services | 2026 |
| Hyland Hall Care Ltd | Health & social care | 2024 |
| Hythe Views Management Company Ltd | Administrative & support | 2019 |
| I-Distribute Ltd | Other services | 2008 |
| I.C.T Solutions & Services Limited | Information & communication | 2002 |
| IAN Sutherland SMS Limited | Professional & scientific | 2025 |
| Ibvg Limited | Construction | 2010 |
| Ice Kitchens London Limited | Manufacturing | 2023 |