| Headstart Media Ltd | Professional & scientific | 2006 |
| Heart and Home Creative Ltd | Wholesale & retail | 2022 |
| Heart of Suffolk Distillery Limited | Manufacturing | 2017 |
| Heart of Suffolk Education Trust | Education | 2010 |
| Hedgerow Farm Honey Ltd | Hospitality | 2024 |
| Hedtek Ltd | Manufacturing | 2007 |
| Heidi a Allard Limited | Professional & scientific | 2025 |
| Helen Sharratt New Limited | Wholesale & retail | 2025 |
| Help to Educate Limited | Education | 2017 |
| Heminway Interiors Limited | Professional & scientific | 2025 |
| Henderson Regulatory Consulting Limited | Professional & scientific | 2010 |
| Hennessy Creative Consulting Limited | Professional & scientific | 2026 |
| Henry Property Developments Limited | Real estate | 2023 |
| Hermetic Media Ltd | Arts & recreation | 2025 |
| HFK (Elmswell) Ltd | Construction | 2020 |
| HG Restorations Limited | Wholesale & retail | 2025 |
| Higgins Talent Sourcing Ltd | Administrative & support | 2019 |
| High Flyers Clothing Ltd | Wholesale & retail | 2017 |
| High Flyers Self Storage Limited | Real estate | 2021 |
| High Frequency Sourcing Ltd | Administrative & support | 2024 |
| Highend Property Avenue Ltd | Real estate | 2024 |
| Hilliard & Woode Properties Limited | Real estate | 2025 |
| Hillier Autos Limited | Wholesale & retail | 2012 |
| Hilton Heating Limited | Construction | 2013 |
| Hirman Limited | Transport & logistics | 2013 |
| Hitbridge Limited | Information & communication | 2026 |
| HO PR Lettings Ltd | Real estate | 2023 |
| Holbay Racing Engines Limited | Extraterritorial | 2008 |
| Holiday LET Opportunities Ltd | Real estate | 2021 |
| Hollis Flooring Ltd | Wholesale & retail | 2020 |
| Hollybank Design Ltd | Real estate | 2016 |
| Holos Medical Limited | Health & social care | 2025 |
| Honey Hill (Old Shire) Management Company Limited | Households | 2025 |
| Hong Food Limited | Hospitality | 2025 |
| Hoop Consulting Limited | Professional & scientific | 2009 |
| Hoopsa Consulting Ltd | Information & communication | 2023 |
| Horti AI Chris Limited | Information & communication | 2026 |
| Hot TUB Village Limited | Wholesale & retail | 2016 |
| Hott Property LLP | | 2016 |
| Hott Property Management Ltd | Real estate | 2016 |
| House of Bothania UK Ltd | Manufacturing | 2024 |
| House of M&A Limited | Manufacturing | 2025 |
| House of Thrower Ltd | Real estate | 2026 |
| Housing First Ltd | Real estate | 2008 |
| Howards Bull Lane Garage Limited | Wholesale & retail | 2021 |
| Howlen Properties Limited | Real estate | 2021 |
| HR Plus Equals Limited | Administrative & support | 2022 |
| Hsin Property Ltd | Real estate | 2018 |
| Hsjj Properties Limited | Real estate | 2018 |
| HTF Sales Limited | Real estate | 2014 |
| Hudhomes Limited | Construction | 2023 |
| Hugestar Productions Limited | Professional & scientific | 2020 |
| Hugh Pulham Farms Limited | Agriculture & fishing | 1973 |
| Huia Project Consulting Ltd | Professional & scientific | 2017 |
| Huia Property Ltd | Real estate | 2017 |
| Human Enterprise Limited | Professional & scientific | 2017 |
| Huntsham Heritage Meats Ltd | Manufacturing | 2025 |
| Hurley Product Design & Development Limited | Manufacturing | 2010 |
| Hutchinsons Landscapes Ltd | Administrative & support | 2018 |
| Hydon Consulting Limited | Professional & scientific | 2011 |
| Hydro Kinetica Limited | Professional & scientific | 2003 |
| I S L Fashion Ltd | Administrative & support | 2018 |
| I S L Property Ltd | Administrative & support | 2018 |
| I Shop Expert Ltd | Wholesale & retail | 2024 |
| Iain Ramsay and SON Ltd | Transport & logistics | 2025 |
| IAN Brightwell Financial Planning Limited | Professional & scientific | 2019 |
| IBO Glass & Glazing Ltd | Construction | 2014 |
| Ichu Ltd | Information & communication | 2020 |
| Icotest Ltd | Extraterritorial | 2020 |
| Idago Enterprises Ltd | Wholesale & retail | 2025 |
| IES Packaging Services Limited | Administrative & support | 2001 |
| IFG Consulting Limited | Professional & scientific | 2012 |
| IKT Property Ltd | Real estate | 2024 |
| IMC Consultancy & Coaching Ltd | Professional & scientific | 2023 |
| Immigration Social Work Services Limited | Health & social care | 2020 |
| Impossible Transformations Limited | Other services | 2015 |
| IN Between Opportunities Ltd. | Real estate | 2013 |
| IN IT for the Tech Limited | Professional & scientific | 2022 |
| Ince Developments Ltd | Construction | 2024 |
| Ince Holdings Ltd | Extraterritorial | 2025 |
| Incorknito Designs Ltd | Extraterritorial | 2022 |
| Indifasteners Ltd | Wholesale & retail | 2023 |
| Inertia Space Ltd | Extraterritorial | 2026 |
| Infinate Solutions Limited | Information & communication | 2017 |
| Infinite Potential Fitness Ltd | Arts & recreation | 2021 |
| Innovate Create Engineer Ltd | Professional & scientific | 2024 |
| Innovate Suffolk C.I.C. | Information & communication | 2019 |
| Innovation Labs Group Limited | Information & communication | 2019 |
| Insight Marketing Agency Ltd | Professional & scientific | 2024 |
| Insight School of Art Limited | Education | 2010 |
| Insight Technology (Suffolk) Limited | Construction | 2020 |
| Inspirational Corporate Experiences Ltd | Administrative & support | 2008 |
| Integrated Management Ltd | Professional & scientific | 2015 |
| Integrated Networks Limited | Information & communication | 2017 |
| Intercab Ltd | Transport & logistics | 2025 |
| Internal Spark Limited | Information & communication | 2020 |
| International Association for Landscape Ecology UK Limited | Information & communication | 2009 |
| Intimacy for Stage and Screen CIC | Other services | 2020 |
| Ionian Fortress Limited | Professional & scientific | 2021 |
| Ipsum YP CIC | Education | 2011 |