| Hudson Chestnut Ltd | Administrative & support | 2001 |
| Hudson Media Partnership Ltd | Manufacturing | 2003 |
| Hudson Way M.C. Limited | Administrative & support | 1990 |
| Huelabs Ltd | Information & communication | 2023 |
| Hughes Treecare Limited | Agriculture & fishing | 2017 |
| Hugo Dobson Golf Limited | Education | 2024 |
| Hulver Court Management Company Limited | Households | 1999 |
| Human Intelligence Services Ltd | Administrative & support | 2020 |
| Humans to Humans Pro Ltd | Administrative & support | 2023 |
| Humberdoucy Sports Centre Limited | Extraterritorial | 2002 |
| Humblewest Limited | Information & communication | 2022 |
| Hummingbird Home Helpers Ltd | Health & social care | 2024 |
| Humphreys Property Holdings B Limited | Real estate | 2019 |
| Humphreys Property Holdings C Limited | Real estate | 2020 |
| Humphreys Property Holdings D Ltd | Real estate | 2023 |
| Humphreys Property Holdings E Ltd | Real estate | 2025 |
| Humphreys Property Holdings F Ltd | Real estate | 2024 |
| Hunnas Onto Thousands Clothing Ltd | Wholesale & retail | 2021 |
| Hunt Finance Limited | Professional & scientific | 2024 |
| Hunter Strength and Fitness Limited | Arts & recreation | 2022 |
| HUR Management Ltd | Information & communication | 2024 |
| Hurd Carpentry & Building Ltd | Construction | 2021 |
| Hurden Holdings Ltd | Financial services | 2025 |
| Hussain Brothers Ipswich Ltd | Wholesale & retail | 2021 |
| Hustl ED’ Ltd | Education | 2026 |
| Hustleclubco Ltd | Wholesale & retail | 2025 |
| Hustyns CA Management Ltd | Hospitality | 2019 |
| Hutchison Arts Limited | Other services | 2016 |
| HV Podiatry Limited | Health & social care | 2022 |
| HVH Ltd | Real estate | 2023 |
| Hyam Properties Limited | Real estate | 2026 |
| Hyams QS Limited | Professional & scientific | 2003 |
| Hybread Electrical Services Limited | Construction | 2014 |
| Hybrid Access Technologies Limited | Information & communication | 2003 |
| Hybrid Global Trade Ltd | Wholesale & retail | 2026 |
| Hybrid Logistics Ltd | Transport & logistics | 2023 |
| Hybrid Performance Supplements Ltd | Health & social care | 2024 |
| Hyde Family Ltd | Construction | 2023 |
| Hyde Holdings Limited | Professional & scientific | 2009 |
| Hyde Sails Limited | Manufacturing | 1980 |
| Hydes Traffic Ltd | Construction | 2022 |
| Hydrodif Products Limited | Wholesale & retail | 1999 |
| Hynes Utilities Limited | Construction | 2011 |
| Hyntle Barn Limited | Real estate | 2026 |
| Hypefactors Limited | Information & communication | 2022 |
| Hyper Cars Ipswich Ltd | Wholesale & retail | 2016 |
| Hyper-Holdings Ltd | Information & communication | 2026 |
| Hyperfoil Ltd | Administrative & support | 2012 |
| Hyre Energy Ltd. | Transport & logistics | 2019 |
| I & S Electrical Limited | Construction | 2011 |
| I AM Investment & Asset Management Limited | Extraterritorial | 2014 |
| I AM Music Community Group | Education | 2013 |
| I C Mechanic Ltd | Wholesale & retail | 2020 |
| I C S (East Anglia) Limited | Wholesale & retail | 2013 |
| I Dataguard Services Ltd | Information & communication | 2015 |
| I Have an Idea Entertainment Limited | Information & communication | 2018 |
| I Have GOT This Ltd | Education | 2021 |
| I L S Property (East Anglia) Limited | Real estate | 2014 |
| I S & G (Holdings) Limited | Professional & scientific | 2007 |
| I S Electrical (Ipswich) Ltd | Construction | 2022 |
| I-Rights Ltd | Professional & scientific | 2007 |
| I. D. Boiler Services Limited | Construction | 2003 |
| I. Rowles Engineering Services Limited | Manufacturing | 2002 |
| I. S. & G. Steel Stockholders Limited | Wholesale & retail | 1930 |
| I.C.Bacon Limited | Information & communication | 1996 |
| I.D.R Concepts Limited | Other services | 2012 |
| I.G.M Haulage Limited | Transport & logistics | 2012 |
| I.M.R.G.K Ltd | Transport & logistics | 2019 |
| I.N. Business Investments Ltd | Transport & logistics | 2018 |
| I.N.A Trans Ltd | Transport & logistics | 2021 |
| I3 Property Management Ltd | Real estate | 2026 |
| I4INNOVATION Ltd | Manufacturing | 1999 |
| Iaer Services Ltd | Transport & logistics | 2026 |
| IAN Booth Consultant Engineer Limited | Construction | 2014 |
| IAN H-B Associates Limited | Information & communication | 2013 |
| IAN Hatcher Limited | Health & social care | 2009 |
| Iapetus Ltd | Real estate | 2022 |
| IAV Electrical Ltd | Construction | 2022 |
| Ibex Business Solutions Ltd | Professional & scientific | 2025 |
| IBH (Property Management) Limited | Households | 2024 |
| Ibjp Properties Limited | Real estate | 2025 |
| Iblue Solutions Limited | Extraterritorial | 2017 |
| IBM65 Ltd | Transport & logistics | 2020 |
| Ibms Group Limited | Professional & scientific | 2016 |
| IC Groundwork Ltd | Construction | 2023 |
| ICA Trans Limited | Transport & logistics | 2019 |
| Icabjj Ltd | Arts & recreation | 2024 |
| Icam Model Limited | Education | 2018 |
| ICC Logistics Ltd | Transport & logistics | 2025 |
| ICC Norwich Ltd | Other services | 2023 |
| ICC Valeting Ltd | Other services | 2022 |
| Icenai Domes Ltd | Education | 2025 |
| Iceni Consulting Anglia Limited | Professional & scientific | 2019 |
| Iceni Developments Anglia Ltd | Construction | 2024 |
| Iceni Ipswich | Health & social care | 2011 |
| Icicle Services Limited | Manufacturing | 2002 |
| ICN Angel Gardens Ltd | Wholesale & retail | 2022 |
| ICO Systems Ltd | Information & communication | 1995 |
| Iconic Medical Solutions Ltd | Professional & scientific | 2012 |
| Iconic Properties Development Limited | Real estate | 2018 |