| Greatworth Classics Ltd | Extraterritorial | 2014 |
| Greatworth Huts Ltd | Hospitality | 2021 |
| Greatworth Imports Limited | Wholesale & retail | 2017 |
| Greatworth Limited | Professional & scientific | 1995 |
| Greatworth Manor Properties Ltd | Real estate | 2021 |
| Green Dog Services Ltd | Professional & scientific | 2023 |
| Green FIG Limited | Professional & scientific | 2020 |
| Green Intelligence Ltd | Information & communication | 2024 |
| Green Interiors Limited | Administrative & support | 1986 |
| Green Lane Automotive Consulting Ltd | Professional & scientific | 2019 |
| Green Machine WM Ltd | Administrative & support | 2022 |
| Green Marsh Ltd | Information & communication | 2020 |
| Green P Holdings Ltd | Real estate | 2021 |
| Green Pastures | Health & social care | 1987 |
| Green Puzzle Energy Solutions Limited | Construction | 2010 |
| Green Savvy Limited | Professional & scientific | 2018 |
| Green Tiger Build Ltd | Construction | 2025 |
| Greencroft Technical Services Limited | Manufacturing | 1998 |
| Greendale Consult Limited | Professional & scientific | 2005 |
| Greenhills Flat Management Company (Banbury) Limited | Real estate | 1976 |
| Greenhouse Cafe Limited | Hospitality | 2012 |
| Greenwood Builders (UK) Limited | Construction | 1997 |
| Gregs Best Motor Ltd | Wholesale & retail | 2019 |
| Gregs Car Parts Ltd | Wholesale & retail | 2024 |
| Grendel Property Investments Limited | Real estate | 2013 |
| Grenville Homes Ltd | Real estate | 2021 |
| Grey Castle Productions Ltd | Arts & recreation | 2023 |
| GRID4GOOD C.I.C. | Professional & scientific | 2021 |
| Gridline Partners Limited | Professional & scientific | 2025 |
| Griffin Ecology Limited | Professional & scientific | 2018 |
| Grimsbury Green Management Limited | Real estate | 1989 |
| Grimsbury Square Management Company Limited | Real estate | 2020 |
| Grizzly Bear PUB Company Ltd | Hospitality | 2019 |
| Grosik Sklep BAN Ltd | Wholesale & retail | 2016 |
| Grossi Group Ltd | Wholesale & retail | 2025 |
| Ground and Water Limited | Construction | 2009 |
| Groundsmith Track Hire Limited | Administrative & support | 2026 |
| Grow Learn Play Project CIC | Health & social care | 2021 |
| Growth Ignition Limited | Professional & scientific | 2014 |
| GSJ Roofing and Building Ltd | Construction | 2019 |
| Gskr Services Ltd | Other services | 2024 |
| GTA Services Ltd | Transport & logistics | 2021 |
| GTS Sewing Machines Limited | Manufacturing | 2010 |
| Guard Goose Media Ltd | Information & communication | 2026 |
| Guille Carlton Solutions Limited | Professional & scientific | 2013 |
| Guilliard's Beauty Limited | Other services | 2010 |
| Gulati-Clements Limited | Health & social care | 2021 |
| Gundog Leads Ltd | Wholesale & retail | 2020 |
| Gunroom Property Limited | Real estate | 2014 |
| GUY a Smith Ltd | Manufacturing | 2020 |
| GW 1244 Limited | Financial services | 2002 |
| Gwenagen Limited | Professional & scientific | 2007 |
| GWF Consulting Ltd | Administrative & support | 2014 |
| GYN Transport Ltd | Transport & logistics | 2024 |
| H & W Services Ltd | Transport & logistics | 2004 |
| H and J Pubs Ltd | Hospitality | 2021 |
| H Collins Farmhaul Limited | Agriculture & fishing | 2012 |
| H Collins Farms Limited | Agriculture & fishing | 2012 |
| H Perry Holdings Limited | Real estate | 2026 |
| H Tasyurdu Property Limited | Real estate | 2022 |
| H&W Services T AS Salix Arboriculture Limited | Agriculture & fishing | 2024 |
| H.B. Equestrian Limited | Agriculture & fishing | 2013 |
| H.D. & R. Solutions Limited | Information & communication | 2008 |
| H.M.E & Sons Property Group Ltd | Real estate | 2020 |
| H21 Properties Ltd | Real estate | 2026 |
| H21 Property Limited | Real estate | 2026 |
| Ha-Ha Limited | Households | 1996 |
| Haas Formula UK Ltd | Arts & recreation | 2014 |
| Hably Limited | Professional & scientific | 1968 |
| Hadsham Enterprises Limited | Agriculture & fishing | 2017 |
| Hadsham Farm Weddings Limited | Real estate | 2017 |
| Hagger Bayley Music Limited | Arts & recreation | 2014 |
| Hailcombe Limited | Real estate | 2010 |
| Hairology Design Limited | Other services | 2024 |
| Hajri Boss Ltd | Transport & logistics | 2025 |
| Hakamafra Ltd | Financial services | 2026 |
| Halligan Limited | Construction | 2007 |
| Hama's Golden CUT Ltd | Other services | 2024 |
| Hamandi Enterprises Limited | Extraterritorial | 2025 |
| Hambidge Property Investments Ltd | Real estate | 2025 |
| Hamilton Properties (Wellesbourne) Limited | Construction | 1992 |
| Hamnashida Games Ltd | Manufacturing | 2023 |
| Hamo Trim Limited | Other services | 2018 |
| Hanako Pharma Ltd | Professional & scientific | 2024 |
| Hand Built Security Ltd | Information & communication | 2012 |
| Hand on the Land Limited | Real estate | 2004 |
| Handleys Accountants Limited | Professional & scientific | 2016 |
| Handling Control Solutions Ltd. | Construction | 2014 |
| Hands of TYM Ltd | Manufacturing | 2020 |
| Hanley Heath Limited | Financial services | 2013 |
| Hanley Holdco Limited | Financial services | 2022 |
| Hanoi Holdings Ltd | Real estate | 2020 |
| Hanwell Fields Residents Association C.I.C. | Health & social care | 2021 |
| Happier Life Limited | Wholesale & retail | 2018 |
| Happy Design & Build Ltd | Construction | 2018 |
| Happy Hound Adventures Ltd | Other services | 2024 |
| Happy House Banbury Ltd | Hospitality | 2026 |
| Harlech Investment Ltd | Professional & scientific | 2017 |
| Harley Consulting Services Limited | Professional & scientific | 2020 |
| Harlo Building Services Limited | Construction | 2022 |