| GG Wiltshire Limited | Hospitality | 2025 |
| Ginger Whiskers Ltd | Agriculture & fishing | 2024 |
| Glow Solo Ltd | Real estate | 2022 |
| GM Home Improvements Ltd | Construction | 2019 |
| Go in Four Limited | Professional & scientific | 2014 |
| Golden Saffron Melksham Ltd | Wholesale & retail | 2026 |
| Gompels Connect Ltd | Professional & scientific | 2025 |
| Gompels Core Limited | Information & communication | 2023 |
| Gompels H C Limited | Real estate | 2013 |
| Gompels Healthcare Limited | Wholesale & retail | 2002 |
| Gompels Limited | Wholesale & retail | 2002 |
| Gompels Services Limited | Administrative & support | 2017 |
| Goughs Lawyers LLP | | 2012 |
| Goughs Solicitors Limited | Other services | 2011 |
| Goughs Trust Corporation Limited | Other services | 2024 |
| Gracie Barra Melksham Ltd | Arts & recreation | 2021 |
| Graham Cooper Ltd | Administrative & support | 2013 |
| Grasshopper Group Limited | Manufacturing | 2016 |
| Green Lantern Training Company Limited | Education | 1998 |
| Greenearth Food Packaging Limited | Hospitality | 2010 |
| Gro-Well Feeds Limited | Extraterritorial | 2005 |
| GRS Cars Limited | Wholesale & retail | 2012 |
| GSW Information Security Services Limited | Information & communication | 2022 |
| GTL Trading Limited | Wholesale & retail | 2024 |
| Gunlog Ltd | Information & communication | 2018 |
| GW Autopaints Ltd | Wholesale & retail | 2019 |
| GWF Nutrition Limited | Manufacturing | 1972 |
| H Rich Fencing Ltd | Construction | 2022 |
| H&Ms Holdings Ltd | Financial services | 2020 |
| Haiphong Ltd | Other services | 2022 |
| Haircutsbykurt Ltd | Other services | 2025 |
| Hardwick Flooring Ltd | Wholesale & retail | 2025 |
| Harrington Horses Limited | Extraterritorial | 2010 |
| Hatton Productions Limited | Professional & scientific | 2024 |
| Hayes Roofing and Rendering Ltd | Construction | 2024 |
| Hazel & Blue Ltd | Wholesale & retail | 2020 |
| Hchg Limited | Administrative & support | 2012 |
| HCS (Wilts) Limited | Construction | 2009 |
| Healthier Foods Limited | Manufacturing | 2015 |
| Heartful Butterfly Ltd | Wholesale & retail | 2023 |
| Hello Global Ltd | Health & social care | 2013 |
| Henchman Limited | Manufacturing | 1995 |
| Herman Miller Global Holdings (UK) Ltd | Financial services | 2020 |
| Herman Miller Holdings Limited | Manufacturing | 2010 |
| Herman Miller Limited | Manufacturing | 1973 |
| Herridge Ventures Ltd | Financial services | 2026 |
| Hillz Haven Ltd | Wholesale & retail | 2023 |
| HK Engineering Ltd | Other services | 2022 |
| HL Chappell Holdings Ltd | Real estate | 2024 |
| Hnhw Ltd | Information & communication | 2024 |
| Holding Wisdom Limited | Professional & scientific | 2008 |
| Holidays & Cruises Travel Agency Limited | Administrative & support | 2010 |
| Holistic Construction Ltd | Construction | 2022 |
| Holistic Demolition Ltd | Construction | 2026 |
| Home Buyer Surveying Limited | Other services | 2021 |
| Home Stylers Ltd | Other services | 2003 |
| Honeysuckle Garden Products Limited | Manufacturing | 1985 |
| Hornet Autos Limited | Wholesale & retail | 2025 |
| House of Love Limited | Health & social care | 2024 |
| Htan Ltd | Wholesale & retail | 2022 |
| Htan Property Ltd | Real estate | 2025 |
| Huggy CHT Limited | Construction | 2026 |
| Hyer Limits Ltd | Financial services | 2021 |
| Hygym 247 Limited | Other services | 2023 |
| Hygym Limited | Wholesale & retail | 2020 |
| I D Newman & SON Limited | Wholesale & retail | 2015 |
| I-Klean & Property Maintenance Ltd | Administrative & support | 2021 |
| IAN Mckinley Ltd | Construction | 2014 |
| ICP BIO (UK) Limited | Extraterritorial | 2005 |
| Iden-Teki Automotive Ltd | Manufacturing | 2023 |
| Idris Preston Properties Ltd | Real estate | 2018 |
| ILA National Ltd | Professional & scientific | 2026 |
| IMI FP Limited | Financial services | 2015 |
| IN and Beyond Ltd | Administrative & support | 2019 |
| IN2SPORT Ltd | Arts & recreation | 2015 |
| Indaba Enterprises Limited | Professional & scientific | 2023 |
| Inity Ltd | Wholesale & retail | 2024 |
| Integrated Glueing Technology Limited | Wholesale & retail | 1984 |
| Inwood Leisure Ltd | Administrative & support | 2012 |
| IPF (Agencies) Ltd | Administrative & support | 2009 |
| IPS Cleaning Ltd | Administrative & support | 2009 |
| IPS Workstream Ltd | Administrative & support | 2013 |
| IV Tactical Limited | Professional & scientific | 2014 |
| J C Automotive Services Ltd | Wholesale & retail | 2025 |
| J Davey CAD Ltd | Professional & scientific | 2014 |
| J H Jones & Sons Holdings Limited | Financial services | 2025 |
| J H Jones & Sons Limited | Construction | 2007 |
| J J Williams (Gaskets) Limited | Extraterritorial | 2001 |
| J P Bearings Ltd | Financial services | 2017 |
| J W Associates (London) Ltd | Wholesale & retail | 2012 |
| J. Saunders Builders Limited | Construction | 2006 |
| J.D Auto Ltd | Wholesale & retail | 2024 |
| J.R Butler Construction Ltd | Construction | 2022 |
| Jaca Electrical Contractors Limited | Construction | 2020 |
| Jaca Renewables Limited | Construction | 2024 |
| Jackson Marsh Property Limited | Real estate | 2016 |
| Jakubowski and Associates Ltd | Professional & scientific | 2017 |
| James Arthur Allen Images Limited | Professional & scientific | 2012 |
| Janusiak Property Ltd | Real estate | 2024 |
| Jarboom Ltd | Other services | 2024 |