| Glazing Vision Limited | Manufacturing | 1994 |
| Glebe Farm Close Property Management Company Limited | Households | 2017 |
| GLP Limited | Wholesale & retail | 2015 |
| Glynis Endo Limited | Health & social care | 2021 |
| Godber & Co. Ltd | Administrative & support | 2009 |
| Godd Engineering Limited | Professional & scientific | 2013 |
| Goddard Enterprises (Suffolk) Limited | Financial services | 2018 |
| Goddess Beauty Limited | Other services | 2018 |
| Godwin-Brown Developments Ltd | Real estate | 2002 |
| Gooderham Horticulture Limited | Agriculture & fishing | 2011 |
| Goodier UK Limited | Financial services | 1999 |
| Goodies Farm Shop Limited | Wholesale & retail | 2005 |
| Gosling Automotive Limited | Wholesale & retail | 2023 |
| Gosmore Limited | Real estate | 2025 |
| GP Classics Limited | Wholesale & retail | 2013 |
| Grant Finder Limited | Information & communication | 2026 |
| Grapevine Computing Ltd | Information & communication | 2012 |
| Grappling Community Ltd | Arts & recreation | 2025 |
| Grasmere Apartments Management Company Ltd | Households | 2025 |
| Grasmere Commercial Services Limited | Professional & scientific | 2010 |
| Grasmere Financial Management LLP | | 2010 |
| Graviteq Ltd | Wholesale & retail | 2011 |
| Gray's Anatomical Ltd | Administrative & support | 2016 |
| Green and Glory Garden Community Interest Company | Agriculture & fishing | 2023 |
| Green Brick Projects Ltd | Construction | 2016 |
| Greendale Veterinary Diagnostics Limited | Professional & scientific | 2004 |
| Greenshoots Energy Limited | Energy | 2010 |
| Greenspace Consultancy Ltd | Professional & scientific | 2023 |
| Grey Echo Ltd | Real estate | 2024 |
| Griffiths and Taylor Limited | Professional & scientific | 2018 |
| Grmoto Limited | Wholesale & retail | 2023 |
| Ground Solar Ltd | Energy | 2022 |
| Grove Healthcare Limited | Health & social care | 2009 |
| GSM Contracting Ltd | Construction | 2026 |
| Guacamole Ltd | Other services | 2026 |
| GUY Mcgregor & Associates Ltd | Administrative & support | 2018 |
| H a Gordon Limited | Professional & scientific | 2025 |
| H H B Communications Holdings Limited | Financial services | 2022 |
| H H B Communications Limited | Wholesale & retail | 1988 |
| H H B Limited | Extraterritorial | 1977 |
| H R Restorations Limited | Construction | 2017 |
| H. Irwin Limited | Agriculture & fishing | 2003 |
| Hackford Hall Limited | Real estate | 2013 |
| Halcyon Days Skincare Limited | Other services | 2003 |
| Half Moon Salon Ltd | Other services | 2025 |
| Hamill Property Ltd | Real estate | 2025 |
| Hannah Hargrave PR & Events Ltd | Professional & scientific | 2018 |
| Hannam Polishing Services Limited | Manufacturing | 2009 |
| Harfang Contracting Ltd | Real estate | 2012 |
| Harleston Glaziers Limited | Construction | 2010 |
| Harleston Magpies Hockey Club Limited | Arts & recreation | 2019 |
| Harris Vehicle Consultancy Ltd | Other services | 2026 |
| Harvey Electrical Services Ltd | Wholesale & retail | 2011 |
| Haugh Farm Holdings Limited | Construction | 2021 |
| Hawthorne Developments Limited | Construction | 1984 |
| Health & Homebake Limited | Manufacturing | 2002 |
| Heat Craft Developments Limited | Construction | 2026 |
| Heath Road Hockering Management Company Limited | Households | 2019 |
| Heritage House Stays Ltd | Real estate | 2025 |
| Heritage Pilates Limited | Arts & recreation | 2026 |
| Heron Meadow CIC | Agriculture & fishing | 2020 |
| Heywood Group Holdings Limited | Financial services | 2026 |
| Heywood Sports and Leisure Ltd | Arts & recreation | 2012 |
| Higdons Cleaning Services Ltd | Construction | 2022 |
| High Precision Foils Limited | Manufacturing | 2007 |
| Highcroft Pet Care Limited | Professional & scientific | 2010 |
| Hill Global Ltd | Administrative & support | 2024 |
| Hillside Office Supplies Limited | Wholesale & retail | 2011 |
| Hockley Price Housing Ltd | Real estate | 2025 |
| Holdan Limited | Wholesale & retail | 1996 |
| Holden Software Solutions Limited | Information & communication | 2012 |
| Home House Family Investments Ltd | Real estate | 2023 |
| Home Service Installations and Silver Audio Ltd | Construction | 2026 |
| Honesty Food Group Ltd | Manufacturing | 2019 |
| Hope After Suicide Loss Ltd | Health & social care | 2018 |
| Hope Raisers Community Interest Company | Hospitality | 2019 |
| Houghton Farmhouse Ltd | Real estate | 2012 |
| House of Huggins Ltd | Real estate | 2021 |
| Houseproud Commercial Limited | Administrative & support | 2008 |
| Howard Nurseries Limited | Wholesale & retail | 2000 |
| HT Tax Limited | Professional & scientific | 2005 |
| Huckle Ecology Limited | Professional & scientific | 2016 |
| Human Aspect Fieldwork Ltd | Professional & scientific | 2024 |
| Hunneybell Homes Ltd | Real estate | 2020 |
| Hunts Hill Properties Limited | Real estate | 1999 |
| HW Assist Limited | Extraterritorial | 2018 |
| HW EA Holdings Limited | Financial services | 2024 |
| Hydroflow Utilities Limited | Construction | 2026 |
| Hyperdrive Arts Collective CIC | Arts & recreation | 2026 |
| I P Marketing Limited | Information & communication | 1998 |
| I.J.B. Engineering Services Ltd | Manufacturing | 2017 |
| IAN Paris Ltd | Construction | 2019 |
| Ibertech Solutions Limited | Information & communication | 2018 |
| Iggywick Limited | Wholesale & retail | 2024 |
| Ikigai Farm Base Limited | Professional & scientific | 2021 |
| In-Far-Structure Ltd | Construction | 2016 |
| Incendium Fireplaces Limited | Construction | 2018 |
| Independent Sales & Technical Consultants Limited | Administrative & support | 2003 |
| Indian View Ltd | Hospitality | 2014 |
| Indigo Music and Media Limited | Information & communication | 2015 |