| Hemsley Heatcare Ltd | Information & communication | 2020 |
| Henry Alan Limited | Other services | 2009 |
| Heritage Green Properties Limited | Real estate | 2020 |
| Herringfleet Limited | Extraterritorial | 2002 |
| Hestia Healthcare (Holdings) Limited | Health & social care | 2014 |
| Hestia Healthcare Limited | Health & social care | 2007 |
| Hestia Healthcare Properties Limited | Health & social care | 2011 |
| Hestia Property Investments Limited | Health & social care | 2008 |
| HEY Website Limited | Information & communication | 2026 |
| Heyglobal Ltd | Construction | 2018 |
| HG Plumbing & GAS Services Ltd | Construction | 2020 |
| HHB Solutions Limited | Professional & scientific | 2013 |
| Hibrty Ltd | Real estate | 2024 |
| High Beech Management (2023) Limited | Households | 2023 |
| High Mill Limited | Real estate | 2004 |
| Hillcroft-Greenlea Properties Ltd | Real estate | 2024 |
| Hillyard Technical Limited | Construction | 2024 |
| Hire ME (Suffolk) Limited | Administrative & support | 2022 |
| HJ Sourcing Ltd | Wholesale & retail | 2025 |
| HJC Property Ltd | Real estate | 2025 |
| HJO Solutions Ltd | Real estate | 2024 |
| HKV Limited | Wholesale & retail | 2018 |
| HNT Ventures Limited | Hospitality | 2026 |
| Holiday Cottages Group Limited | Professional & scientific | 1995 |
| Holland Financial Services Limited | Financial services | 2011 |
| Hollingsworth Store Ltd | Wholesale & retail | 2021 |
| Holly Brook Home and Tech Ltd | Wholesale & retail | 2025 |
| Home Energy Consultants Limited | Construction | 2020 |
| Home Front Property Management Ltd | Households | 2019 |
| HOME13 Consultancy Ltd | Information & communication | 2025 |
| Homechoice Fire Doors Ltd | Construction | 2024 |
| Homechoice Improvements Ltd | Construction | 2023 |
| Homeshare Norfolk and Suffolk CIC | Health & social care | 2024 |
| Homestyle Country Foods Limited | Manufacturing | 2025 |
| Homewood and Rose Limited | Wholesale & retail | 2018 |
| Honeysuckle Properties & Developments Ltd | Real estate | 2019 |
| Hoot Properties Limited | Real estate | 2017 |
| Hopton Manor Estates Ltd | Hospitality | 2020 |
| Hoseasons Cottages Limited | Professional & scientific | 1978 |
| Hoseasons Holidays Limited | Professional & scientific | 1978 |
| Hoseasons Limited | Professional & scientific | 1999 |
| Hot Gossip (East Anglia) Limited | Professional & scientific | 2014 |
| Hotel Katherine Ltd | Extraterritorial | 2017 |
| House of Gimlet Ltd | Arts & recreation | 2022 |
| House of Stock Ltd | Wholesale & retail | 2020 |
| Hovebay Limited | Real estate | 1989 |
| Howard’S Cafe Ltd | Hospitality | 2026 |
| Howberry Holdings Limited | Wholesale & retail | 2023 |
| Hpwr Ltd | Wholesale & retail | 2019 |
| HRW Engineering Ltd | Professional & scientific | 2024 |
| Hsqe Consultant Ltd | Professional & scientific | 2020 |
| Htot Limited | Real estate | 2018 |
| Hucai Ltd | Professional & scientific | 2021 |
| Hudson and SON Roofing Contractor Ltd | Construction | 2009 |
| Humanity House Trust | Information & communication | 2016 |
| Hunt Properties EA Limited | Real estate | 2021 |
| Hunter Giveaways Ltd | Other services | 2020 |
| Hurren Builders (Lowestoft) Limited | Construction | 2002 |
| Hutchings Direct Limited | Wholesale & retail | 2018 |
| Huzeropz Limited | Construction | 2014 |
| Hwsi Limited | Professional & scientific | 2021 |
| Hydrocarbs Limited | Other services | 2009 |
| Hydroimages Ltd | Professional & scientific | 2025 |
| Hydrosub (Asia) Limited | Extraterritorial | 2010 |
| Hysmet Limited | Other services | 2013 |
| HZN FBA Limited | Wholesale & retail | 2022 |
| I Made This Limited | Manufacturing | 2024 |
| I.Chilley Ltd | Hospitality | 2022 |
| IAN Garrett Building Design Limited | Professional & scientific | 2010 |
| IAN Smith Engineering Limited | Professional & scientific | 2006 |
| IAN Thomas Electrical Ltd | Construction | 2026 |
| IAN Youngman MMS Limited | Mining & quarrying | 2018 |
| Ibra Zaff Hospitality Ltd | Construction | 2019 |
| Ice Cream @ the Claremont Ltd | Wholesale & retail | 2024 |
| Ice House Quay Residents Association Ltd | Households | 2010 |
| Icebox Air Conditioning Limited | Construction | 2019 |
| Icentric Limited | Health & social care | 2012 |
| IDA Hand Car Wash Ltd | Administrative & support | 2023 |
| Ideal Golf Limited | Arts & recreation | 2006 |
| Ifezara Group Ltd | Administrative & support | 2026 |
| Ihbk Global Limited | Real estate | 2016 |
| Ikon Resolve Ltd | Professional & scientific | 2023 |
| IM Driving Ltd | Education | 2024 |
| Imb's Investments Ltd | Real estate | 2024 |
| Imin Logistics Private Ltd | Transport & logistics | 2024 |
| Impact Xchange Enterprise Limited | Information & communication | 2026 |
| Inclu Consulting Limited | Professional & scientific | 2003 |
| Inclu Travel Group Ltd | Professional & scientific | 2022 |
| Inclucare Ltd | Administrative & support | 2022 |
| Inclumedia Ltd | Information & communication | 2022 |
| Inclutravel Ltd | Extraterritorial | 2022 |
| Independent Environmental Consultancy Limited | Professional & scientific | 2010 |
| Independent Forklift Services Limited | Manufacturing | 2015 |
| Indigo Energy Solutions Limited | Professional & scientific | 2020 |
| Ineos Grenadier Owners Club Ltd | Extraterritorial | 2023 |
| Infinite Possibilities Ltd. | Administrative & support | 1997 |
| Inside OUT Marquees Limited | Hospitality | 1993 |
| Inspec (E.A.) Limited | Professional & scientific | 2004 |
| Inspired Property Developments Limited | Real estate | 2019 |
| Inspired Property Rentals Ltd | Real estate | 2024 |