| High Five's Property Ltd | Real estate | 2022 |
| Highgate Bell Limited | Professional & scientific | 2018 |
| Hillen Road Convenience Store Limited | Wholesale & retail | 2014 |
| Hillgate Nurseries Limited | Agriculture & fishing | 2002 |
| Himas Group Ltd | Health & social care | 2022 |
| Hitch Management Company Ltd | Administrative & support | 2017 |
| HK Commercial Sales & Hire Limited | Administrative & support | 2017 |
| HKJ Enterprises Ltd | Hospitality | 2024 |
| Hnmr Limited | Information & communication | 2017 |
| Hockey Stop Ltd | Wholesale & retail | 2019 |
| Hoff Bros. Limited | Agriculture & fishing | 1957 |
| Holiday Lodges Ltd | Hospitality | 2021 |
| Holla Workshops CIC | Education | 2025 |
| Hollyhocks HR Consultancy Ltd | Administrative & support | 2026 |
| Holt & Company Auctioneers Limited | Other services | 2000 |
| Holt Architectural Limited | Professional & scientific | 2012 |
| Home Farm Norfolk Limited | Construction | 2022 |
| Home Service Broadcasting Ltd | Information & communication | 2020 |
| Homeglow Plumbing and Heating Services Ltd | Construction | 2026 |
| Homehobby Ltd | Other services | 2017 |
| Honbs Limited | Wholesale & retail | 2026 |
| Hooker Roofing Ltd | Construction | 2013 |
| Hopkins Property Services Ltd | Construction | 2016 |
| Horizon Medical Clinics Ltd | Administrative & support | 2025 |
| Hornet Geoconsulting Ltd. | Mining & quarrying | 2005 |
| Horses in Sport Limited | Wholesale & retail | 1998 |
| Hotfoot Promotions Ltd | Other services | 2017 |
| Houghton AC Ltd | Real estate | 2015 |
| House Clearance Norfolk Ltd | Transport & logistics | 2019 |
| House Food 1 Ltd | Hospitality | 2025 |
| House Hotel 1 Ltd | Hospitality | 2025 |
| House Hotel 2 Ltd | Hospitality | 2025 |
| House of Prime Ltd | Real estate | 2026 |
| Howards Group Limited | Wholesale & retail | 2022 |
| Howell Solutions Limited | Construction | 2017 |
| Howka Limited | Manufacturing | 2026 |
| Howlett Farming Company Limited | Agriculture & fishing | 2012 |
| Howlett Roofing and Cladding Ltd | Construction | 2025 |
| HP (Fakenham) Limited | Construction | 2016 |
| HPS Builders Ltd | Construction | 2018 |
| HPS Projects Ltd | Construction | 2024 |
| HS Investment Holdings Limited | Real estate | 2020 |
| HS Parts Limited | Wholesale & retail | 2024 |
| HSB for YOU Limited | Construction | 2025 |
| Hsel Group Limited | Financial services | 2018 |
| Hsel Lettings Limited | Real estate | 2018 |
| HTS Private Ltd | Households | 2025 |
| Hub Central Limited | Information & communication | 2002 |
| Hudson FEN Leisure Limited | Arts & recreation | 2008 |
| Hummingbird Consulting Limited | Professional & scientific | 2015 |
| Hundred Foot Holdings Limited | Agriculture & fishing | 2022 |
| Hunstanton Craft Fairs Ltd | Wholesale & retail | 2025 |
| Hunter Design, Build & Install Ltd | Construction | 2016 |
| Hunters Construction Ltd | Construction | 2023 |
| Hupus Limited | Hospitality | 2019 |
| Hurnfield Hargate Limited | Hospitality | 1965 |
| Hussite Limited | Agriculture & fishing | 1977 |
| HUV Properties Limited | Real estate | 2024 |
| Huxley Close Management Company Ltd | Administrative & support | 2022 |
| Hvjag Medical Services Limited | Health & social care | 2023 |
| HWK Consulting Limited | Professional & scientific | 2024 |
| Hyde Close (Bircham Newton) Company Limited | Households | 2004 |
| Hypnosis Courses Ltd | Other services | 2018 |
| Hypnotc Ltd | Other services | 2015 |
| I and J Construction Ltd | Construction | 2019 |
| I B a Insurance Services Ltd | Financial services | 1993 |
| I C Barnett Ltd | Construction | 2014 |
| I Love Sushi Ltd | Hospitality | 2026 |
| I M F Engineering Limited | Wholesale & retail | 2003 |
| I Perrin Flooring Limited | Construction | 2014 |
| IAN Harding Limited | Real estate | 1995 |
| IBA Wealth Management Limited | Financial services | 2004 |
| Ibiza Ltd | Administrative & support | 2015 |
| Iceni Drilling Services Limited | Administrative & support | 2017 |
| Iceni Tree Care Ltd | Agriculture & fishing | 2019 |
| Icis Consulting Limited | Construction | 2006 |
| ICS Coaching Ltd | Education | 2020 |
| ID Optical Limited | Professional & scientific | 2016 |
| Idea Housing & Property Ltd | Construction | 2020 |
| Ideve Limited | Professional & scientific | 2010 |
| Idlewyld Ltd | Extraterritorial | 2025 |
| IFD Group Limited | Manufacturing | 2021 |
| IGA Estates Limited | Real estate | 2013 |
| IGB 2023 Limited | Health & social care | 2023 |
| Ignite MEA Ltd | Information & communication | 2014 |
| Ignite Technology Limited | Information & communication | 2002 |
| Ignito Tuition Ltd | Education | 2025 |
| IHB Holdings Ltd | Administrative & support | 2024 |
| Ihor Service Ltd | Wholesale & retail | 2018 |
| IKO & a Services Ltd | Transport & logistics | 2018 |
| Ilange Trading & Projects Ltd | Wholesale & retail | 2023 |
| Ilecsville Ltd | Real estate | 2021 |
| Ilex Property Group Ltd | Real estate | 2021 |
| Illann Clothing Limited | Wholesale & retail | 2024 |
| Imaginary Turtles Ltd | Manufacturing | 2021 |
| Immunall Limited | Agriculture & fishing | 2001 |
| Imogen D Farrell Limited | Professional & scientific | 2019 |
| Imogen's Healthcare Ltd | Health & social care | 2020 |
| Inbex Random Limited | Information & communication | 2007 |
| Independent Scaffold Training Ltd | Construction | 2016 |