| Fundbridge Limited | Extraterritorial | 2023 |
| Fusion Nutrition Limited | Manufacturing | 2018 |
| Fusion Targeted Nutrition Limited | Manufacturing | 2012 |
| G C Coaching Limited | Arts & recreation | 2026 |
| Gallesti Ltd | Information & communication | 2025 |
| Gamanu Haulage Ltd | Transport & logistics | 2026 |
| Gamlingay Community Centre | Arts & recreation | 2010 |
| Gamlingay Community Turbine Ltd | Energy | 2010 |
| Garlill Limited | Real estate | 2016 |
| Garner Investment Properties Ltd | Real estate | 2025 |
| Gastrana Ltd | Hospitality | 2024 |
| GB Sites Ltd | Information & communication | 2026 |
| Gbtryesandservices Ltd | Manufacturing | 2025 |
| Geejay Chemicals Limited | Wholesale & retail | 1982 |
| Geejay Holdings Limited | Financial services | 2016 |
| GEM Gems T.V & Film Ltd | Information & communication | 2025 |
| Geobuilders Ltd | Education | 2026 |
| Geoffrey Chng Enterprise Ltd | Manufacturing | 2026 |
| Geomega Ltd | Construction | 2007 |
| GET Good Media Ltd | Information & communication | 2023 |
| Giffster Media Ltd | Arts & recreation | 2015 |
| Gilks Fencing Limited | Construction | 2004 |
| GKR CNC Ltd | Manufacturing | 2019 |
| Gladstone Electrical Limited | Construction | 2019 |
| Glanced Limited | Professional & scientific | 2025 |
| Global Fibre Networks Ltd | Information & communication | 2018 |
| Go Bakery Ltd | Hospitality | 2024 |
| Go Digital IT Limited | Information & communication | 2025 |
| Go to FIG.2 Limited | Information & communication | 2008 |
| GP Accounts Ltd | Professional & scientific | 2012 |
| Gransden CFC Limited | Agriculture & fishing | 2002 |
| Grapevine Design & Marketing Limited | Information & communication | 2009 |
| Grassgate Business Park Limited | Construction | 2026 |
| Gravity Assist Technology Ltd | Information & communication | 2018 |
| Great Gransden Farms Limited | Agriculture & fishing | 1968 |
| Greatbigday Ltd | Wholesale & retail | 2023 |
| Green Beaver Limited | Construction | 2017 |
| Green GEN Limited | Real estate | 1994 |
| Greenbay Capital Partners Ltd | Real estate | 2025 |
| Greenfields Day Nursery (Great Gransden) Limited | Education | 2000 |
| Griggs Estates Limited | Construction | 2014 |
| GRK Property Group Ltd | Real estate | 2026 |
| GRK Retail Ltd | Wholesale & retail | 2026 |
| Groovx Fitness Ltd | Education | 2020 |
| Growing Together Physiotherapy Ltd | Health & social care | 2026 |
| GT Specialist Vehicle Hire Limited | Administrative & support | 2018 |
| GWC Joinery Limited | Manufacturing | 2016 |
| H.F.I. Limited | Transport & logistics | 1996 |
| H3-RC Ltd | Manufacturing | 2025 |
| Haggerston Films Limited | Information & communication | 2014 |
| Hallmark Equipment Service Ltd | Administrative & support | 2005 |
| Halo Hair Salon Limited | Other services | 2021 |
| Hand Car Wash in Gamlingay Limited | Administrative & support | 2022 |
| Hansford Engineering Limited | Professional & scientific | 2005 |
| Happy Feet Creative Limited | Arts & recreation | 2013 |
| Hardstamp Ltd | Professional & scientific | 2025 |
| Harold & Wolfgang Limited | Information & communication | 2016 |
| Hash One Ltd | Information & communication | 2020 |
| Hatley Park Farms Limited | Agriculture & fishing | 1973 |
| Havannah Barns Ltd | Construction | 2024 |
| HAY There Ltd | Wholesale & retail | 2023 |
| Haygan Asset Management Ltd | Real estate | 2026 |
| Hazells Hall Limited | Households | 1982 |
| Heatbox Ltd | Construction | 2021 |
| Heath and Home Ltd | Manufacturing | 2021 |
| Heath CP Ltd | Construction | 2023 |
| Helen Dean Business Support Consultancy Limited | Professional & scientific | 2020 |
| Heritage Painters & Decorators Ltd | Construction | 2004 |
| Heron Fleet Services Ltd | Wholesale & retail | 2016 |
| Herts Cleaning Solutions Ltd | Wholesale & retail | 2023 |
| HF Refrigeration Services Ltd | Professional & scientific | 2022 |
| HHG Real Estate Ltd | Real estate | 2024 |
| Hi-Pro Scaffolding Holdings Limited | Financial services | 2014 |
| Hi-Pro Scaffolding Limited | Construction | 1987 |
| Hickswell Accountancy Limited | Professional & scientific | 2024 |
| High Street Motorcycles Ltd | Wholesale & retail | 2025 |
| Hippynut Eco Ltd | Wholesale & retail | 2023 |
| Hive Property Care Ltd | Households | 2025 |
| HML Work Ltd | Professional & scientific | 2026 |
| Holla Brewing Company Ltd | Manufacturing | 2025 |
| Home Farm Barns (Wrestlingworth) Limited | Households | 2016 |
| Hone Foods Limited | Hospitality | 2022 |
| Hornetsoft IT Consultants Limited | Information & communication | 2002 |
| Horsford Limited | Real estate | 2018 |
| Horslow Street 1968 Limited | Extraterritorial | 2015 |
| House of Judah Ltd | Information & communication | 2011 |
| Household of David Church UK Ltd | Other services | 2023 |
| Howson's Electrical Services Ltd | Construction | 2020 |
| Huongs Takeaway Ltd | Hospitality | 2024 |
| Huski Interiors Ltd | Construction | 2023 |
| Hutchinson Developments Limited | Construction | 2004 |
| Hutchison Heating and Plumbing Ltd | Construction | 2004 |
| Hyde & Lewis Limited | Professional & scientific | 2006 |
| I Have Seen Things Ltd | Information & communication | 2010 |
| I S Contractors Limited | Construction | 2010 |
| I.H.A. Limited | Information & communication | 1995 |
| IBC Production Ltd | Information & communication | 2023 |
| Icmus - Inspire Community Music CIC | Wholesale & retail | 2017 |
| IDK Media Ltd | Arts & recreation | 2025 |
| Ignis Risk & Fire Consultancy Ltd | Professional & scientific | 2025 |