| Glass Apps Limited | Information & communication | 2021 |
| Glasswell & Last Limited | Construction | 1976 |
| Gleam Cleaning & Environmental Services Ltd | Other services | 2006 |
| Glemsford Silk Mills Limited | Extraterritorial | 1936 |
| Glencastle Education Ltd | Education | 2004 |
| Glenntrade Limited | Wholesale & retail | 2007 |
| Glenside Residents Association Limited | Households | 2004 |
| Glimma UK Ltd | Extraterritorial | 1981 |
| Global Image Management Limited | Professional & scientific | 2000 |
| Globe Fantasy Limited | Wholesale & retail | 1989 |
| GM Holdings (Felixstowe) Limited | Professional & scientific | 2006 |
| Go APE EOT Limited | Professional & scientific | 2021 |
| Go Helvetia Ltd | Financial services | 2025 |
| Gold Haven Homes Ltd | Real estate | 2026 |
| Golden City 168 Ltd | Hospitality | 2022 |
| Golden Class Movies Ltd | Information & communication | 2018 |
| Goldflash Ventures Limited | Professional & scientific | 2003 |
| GOSUSPR36 Ltd | Wholesale & retail | 2017 |
| Graham Avery (East Anglia) Limited | | 1972 |
| Graham Bunn Carpentry Limited | Construction | 2007 |
| Grahame R. Bolton Limited | Manufacturing | 2005 |
| Grama Group Limited | Professional & scientific | 2023 |
| Granville New Energy Co. Ltd. | Wholesale & retail | 2021 |
| Gray Relief Healthcare Limited | Health & social care | 2020 |
| Great Bradley Farms Company | Agriculture & fishing | 1964 |
| Great British Bell Tents Ltd | Hospitality | 2020 |
| Great Wave Property Limited | Real estate | 2024 |
| Greatsun International Co., Ltd | Extraterritorial | 2016 |
| Green Town Ltd | Hospitality | 2020 |
| Greenace Garage (Ipswich) Limited | Wholesale & retail | 2004 |
| Greene King CH Investments Limited | Real estate | 2021 |
| Greene King Commercial Investments Limited | Real estate | 2021 |
| Greene King Property Development Limited | Construction | 2021 |
| Greene King Residential Investments Limited | Real estate | 2021 |
| Greenhay's Nursery School Ltd | Education | 2009 |
| Greentithe Limited | Construction | 2009 |
| Grenville Property Group Ltd | Real estate | 2022 |
| Griffett Holdings Ltd | Real estate | 2024 |
| Griffett Ltd | Wholesale & retail | 2020 |
| Groundwork Solutions Ltd | Extraterritorial | 2018 |
| GROWG8 Ltd | Information & communication | 2024 |
| Grub 'N ALE Taverns Limited | | 1994 |
| GSP Fire Safety + Security Ltd | Other services | 2021 |
| GSP Group Ltd | Other services | 2021 |
| Gurg AI Limited | Information & communication | 2023 |
| Gurg Books Limited | Information & communication | 2021 |
| Gurg Games Limited | Information & communication | 2023 |
| Gurg Medical AI Limited | Information & communication | 2023 |
| Guzin Travel Agency Consultancy Ltd | Manufacturing | 2021 |
| Gyim Ltd | Real estate | 2021 |
| Gymnastics in Ipswich | Arts & recreation | 1997 |
| H W Webb (Engineers) Limited | Manufacturing | 1995 |
| H&Y 888 Ltd | Hospitality | 2024 |
| H. & A.W.Palmer Limited | Construction | 1955 |
| H. C. Alexander Limited | Wholesale & retail | 1957 |
| H. Wightman & SON Limited | Wholesale & retail | 1966 |
| H.E. Hipperson Limited | Arts & recreation | 1955 |
| Haas & Partners Ltd | Real estate | 2022 |
| Habla Spanish UK Ltd | Other services | 2023 |
| Habyl Limited | Wholesale & retail | 2020 |
| Hair by Chika Limited | Other services | 2025 |
| Halesworth Bookshop Limited | Wholesale & retail | 2005 |
| Halesworth Motor Company Limited | Extraterritorial | 1990 |
| Halesworth Tyre and Exhaust Limited | Extraterritorial | 1998 |
| Half Moon Hospitality Solutions Ltd | Hospitality | 2025 |
| Hambling Catering Ltd | Hospitality | 2002 |
| Hamilton Recruitment Limited | Administrative & support | 2001 |
| Hammond Commercial Vehicle Centre Limited | Extraterritorial | 1990 |
| Hammonds of Halesworth Limited | Extraterritorial | 1991 |
| HAN Taylor Limited | Education | 2024 |
| Hangsun Electronics (UK) Limited | Wholesale & retail | 2017 |
| Hann Essentials Ltd | Wholesale & retail | 2023 |
| Haoyunlianl Ltd | Hospitality | 2024 |
| Harbour Marine Services Limited | Manufacturing | 1988 |
| Harding Davey Limited | Real estate | 2008 |
| Harmony Land Development Ltd | Real estate | 2021 |
| Harmony Land Holding Ltd | Financial services | 2024 |
| Harmony Land Investment Ltd | Real estate | 2020 |
| Harmony Land Management Ltd | Real estate | 2021 |
| Harmony Land Property Ltd | Real estate | 2024 |
| Harmony Land Property Management Ltd | Real estate | 2020 |
| Harry Ruffell & Co Limited | Agriculture & fishing | 1942 |
| Hartismere Estates Limited | Real estate | 2002 |
| Harvey Harris Builders Limited | Construction | 2007 |
| Hatton Services Group Ltd | Professional & scientific | 2026 |
| Havenwood Engineering Limited | | 1965 |
| Havillah Holdings Limited | Financial services | 2025 |
| Hazell Legal Limited | Professional & scientific | 2023 |
| HBF Pet Services Limited | Arts & recreation | 2024 |
| Hcme Limited | Manufacturing | 2019 |
| Healinz Ltd | Manufacturing | 2023 |
| Heart Bypass Golfers Limited | Professional & scientific | 1999 |
| HEATING4LIFE Ltd | Manufacturing | 2022 |
| Heils Bakery Limited | Manufacturing | 2003 |
| Heir of the Diaspora Ltd | Wholesale & retail | 2023 |
| Helga Endeavours Limited | Wholesale & retail | 2003 |
| Helicon Trading Co Ltd | Wholesale & retail | 2024 |
| Hellovan Ltd | Transport & logistics | 2026 |
| Hendricito Productions Ltd | Information & communication | 2023 |
| Herbal Antidote Labs Ltd | Wholesale & retail | 2026 |