| GRB Home Renovations Ltd | Construction | 2023 |
| GRD Manufacturing Limited | Manufacturing | 2023 |
| Great Western Car Sales Limited | Wholesale & retail | 2014 |
| Greek Newbury Limited | Hospitality | 2025 |
| Green Energy Sustainable Solutions Limited | Construction | 2016 |
| Green Gate Mechanical Services Ltd | Construction | 2009 |
| Green Giraffe Limited | Professional & scientific | 2008 |
| Green Heat Energy Ltd | Financial services | 2013 |
| Green House I Ltd | Real estate | 2025 |
| Green Mile Lawn Care Limited | Administrative & support | 2012 |
| Green Park Consulting Limited | Extraterritorial | 2002 |
| Green Park Land Company Limited | Construction | 2002 |
| Green Square Landscapes Limited | Administrative & support | 2008 |
| Green Verde Tech Limited | Manufacturing | 2024 |
| Green Woodpecker Ltd | Construction | 2016 |
| Greene Consultancy Limited | Professional & scientific | 2024 |
| Greengrocers of Stockbridge Limited | Wholesale & retail | 2022 |
| Greenham Lock Marina Limited | Other services | 2007 |
| Greenham Mill (Freehold) Company Limited | Real estate | 2002 |
| Greenham PL Ltd | Real estate | 2018 |
| Greenham Trust Ltd | Real estate | 1997 |
| Greenmeadow Commercial Services Limited | Wholesale & retail | 1995 |
| Greenslate Properties Limited | Real estate | 2022 |
| Greenstone Newbury Limited | Hospitality | 2024 |
| Greenwire Solar Ltd | Construction | 2011 |
| Greenwood Garage Services Limited | Other services | 2000 |
| Grenco Media Ltd | Arts & recreation | 2015 |
| Gresford Architects Limited | Professional & scientific | 2006 |
| Grey Wolf Ventures Limited | Professional & scientific | 2025 |
| Greystone Renovations Ltd | Construction | 2023 |
| Grizzly Grips Ltd | Information & communication | 2005 |
| GRM Developments Ltd | Construction | 2025 |
| Grounded Agvice Ltd | Agriculture & fishing | 2024 |
| Group SAS UK Limited | Wholesale & retail | 2019 |
| Group Whistle Limited | Professional & scientific | 2023 |
| Grupellox Ltd | Wholesale & retail | 2017 |
| GS Corporate Finance Limited | Financial services | 2024 |
| Gsam Consulting Limited | Professional & scientific | 2007 |
| Gsurv Ltd | Construction | 2016 |
| GT. Electric Services Ltd | Construction | 2009 |
| Guardpro Facilities Management Ltd | Other services | 2025 |
| GUN RUM Ltd | Manufacturing | 2019 |
| Gupta Estate Limited | Real estate | 2022 |
| Gurkha Chef Limited | Hospitality | 2006 |
| Guts Studio Ltd | Professional & scientific | 2025 |
| GUY Stevens Design Ltd | Professional & scientific | 2023 |
| GVO Capital Ltd | Financial services | 2013 |
| GVO Monti Limited | Financial services | 2016 |
| GVO S-1 Ltd | Real estate | 2018 |
| Gvus Ltd | Wholesale & retail | 2021 |
| Gygalates Ltd | Other services | 2020 |
| H & H Building Services Didcot Ltd | Construction | 2022 |
| H & H Holdings (Newbury) Limited | Extraterritorial | 2003 |
| H & V Controls Limited | Extraterritorial | 1972 |
| H D P Properties Limited | Real estate | 2021 |
| H J Wheeler Limited | Information & communication | 2010 |
| H Simmonds Builders Limited | Construction | 2003 |
| H-Te Controls Limited | Extraterritorial | 1997 |
| H. Dolton & SON Limited | Real estate | 1934 |
| H. Luckett & Co. Limited | Transport & logistics | 1972 |
| H. Squared Electronics Limited | Extraterritorial | 1979 |
| H.Barr & Sons Limited | Agriculture & fishing | 1956 |
| H.C.Marsh(Newbury)Limited | Wholesale & retail | 1957 |
| H2 Asset Management Limited | Real estate | 2025 |
| H2 Creative (Bath) Limited | Information & communication | 2019 |
| Hackneygrove Ltd | Professional & scientific | 2015 |
| Haden Brickwork Limited | Construction | 2023 |
| Hadfield Properties Limited | Professional & scientific | 2007 |
| HAG Holdings Ltd | Real estate | 2024 |
| HAH UK Group Ltd | Information & communication | 2025 |
| Hair OFF the Dog Groomers Ltd | Other services | 2023 |
| Hajoso Limited | Professional & scientific | 2016 |
| Halkidiki Beach Homes Ltd | Real estate | 2023 |
| Halletts Estate Agents Limited | Real estate | 2017 |
| Halls Medical Limited | Health & social care | 2017 |
| Halt Print Limited | Wholesale & retail | 2017 |
| Haltag Consulting Ltd | Administrative & support | 2013 |
| Hammond Property Ltd | Real estate | 2019 |
| Hampshire & Berkshire Developments Ltd | Construction | 2024 |
| Hampshire Designer Vault Ltd | Wholesale & retail | 2025 |
| Hampshire Golf Limited | Arts & recreation | 2019 |
| Hamstead Marshall Wildlife Ltd | Agriculture & fishing | 2023 |
| Hands of Time Designs Ltd | Arts & recreation | 2024 |
| Hangar Vaults Ltd | Wholesale & retail | 2025 |
| Hannington & Green Electrical Limited | Construction | 2017 |
| Hanson Management Consulting Ltd | Professional & scientific | 2013 |
| Hanya Skye Photography Ltd | Professional & scientific | 2026 |
| Happy Golden Investment Limited | Real estate | 2023 |
| Happy Kids Newbury Ltd | Health & social care | 2015 |
| Happyrock Limited | Professional & scientific | 2014 |
| Harborough Marine Ltd | Manufacturing | 2017 |
| Harbour to Horizon Limited | Administrative & support | 2017 |
| Hargreaves and Threadgold Limited | Other services | 2021 |
| Harley Homes (Newbury) Limited | Construction | 2007 |
| Harpsden Ventures Limited | Real estate | 2005 |
| Harrier Entertainment Ltd | Information & communication | 2023 |
| Harrison Alexander Limited | Administrative & support | 2021 |
| Harrison Portfolio & Projects Limited | Extraterritorial | 2021 |
| Harry Derham Racing Ltd | Arts & recreation | 2021 |
| Harry Rush Flooring Ltd | Construction | 2024 |