| Frank Brehany Publishing Ltd | Information & communication | 2021 |
| Freedom Founders Ltd | Information & communication | 2023 |
| Fresh Tracks Surveying Limited | Construction | 2005 |
| Freshfade Barber Ltd | Other services | 2025 |
| Friend Group Ltd | Financial services | 2023 |
| Friend Property Management Ltd | Real estate | 2023 |
| Friends for Pets Vale of Glamorgan Ltd | Other services | 2023 |
| Friends of Osbaston Green Spaces Limited | Arts & recreation | 2026 |
| Frontline AI Ltd | Professional & scientific | 2024 |
| Fulcrum Defence Services Ltd | Public administration | 2020 |
| Full Fill Limited | Construction | 2025 |
| Funn Hosiery Ltd | Manufacturing | 2023 |
| Future Sounds Limited | Professional & scientific | 1966 |
| Future Streets South Wales Limited | Construction | 2024 |
| G J Plumbing & Heating Services Limited | Construction | 2021 |
| Gadget Line Films Ltd | Information & communication | 2016 |
| Gaia Vessels Ltd | Wholesale & retail | 2020 |
| Gamma Mindset Limited | Other services | 2013 |
| Garden Style (South West) Limited | Construction | 2006 |
| Gatwick Enterprise Tax Services Limited | Professional & scientific | 2014 |
| Gcmt Limited | Other services | 2023 |
| Genemec Ltd | Professional & scientific | 2015 |
| Genepy UK Limited | Professional & scientific | 2020 |
| Genesis Nuclear Ltd | Professional & scientific | 2014 |
| Genie Systems Limited | Administrative & support | 2006 |
| Geometron Bikes Limited | Manufacturing | 2017 |
| Geonex Consulting Limited | Other services | 2013 |
| GET UP and Go Limited | Administrative & support | 2019 |
| Giddy Goat Games Limited | Manufacturing | 2023 |
| Giles Preece Marketing Ltd | Financial services | 2015 |
| Ginger Frog Limited | Arts & recreation | 2016 |
| Glamorgan Investments Limited | Construction | 1881 |
| Glanbaiden Estates Limited | Construction | 2023 |
| Gleed Contracting Services Ltd | Construction | 2023 |
| Global Blended Learning Limited | Education | 2015 |
| Global Fire & Safety Services Ltd | Professional & scientific | 2007 |
| Glossy Starling Holdings Ltd | Real estate | 2023 |
| GM Mowers & Machinery Ltd | Manufacturing | 2018 |
| GMP Foundations Limited | Professional & scientific | 2007 |
| Goldwire Convenience Store Ltd | Wholesale & retail | 2016 |
| Gone to the Beach Ltd | Extraterritorial | 2016 |
| Gore Holdco Limited | Financial services | 2024 |
| Goscan NDT Ltd | Manufacturing | 2020 |
| Grace Property Solutions Limited | Real estate | 2019 |
| Graff Arty Limited | Arts & recreation | 2025 |
| Graham's Building Contractors Ltd | Construction | 2024 |
| Grange Distillery Ltd | Manufacturing | 2025 |
| Grays Inn Associates Ltd | Other services | 2016 |
| Great British Walks Limited | Administrative & support | 2017 |
| Great Oak Financial Planning Ltd | Financial services | 2022 |
| Green Dream Innovation Limited | Wholesale & retail | 2010 |
| Green Grafter Ltd | Other services | 2006 |
| Green Moon Events Limited | Administrative & support | 2010 |
| Greenland Petts Wood Ltd | Wholesale & retail | 2017 |
| Greenvalley QS Services Ltd | Professional & scientific | 2024 |
| Griffin Scientific Limited | Health & social care | 2015 |
| Grinning Soul Records Ltd | Wholesale & retail | 2024 |
| Grosvenor Maxwell Limited | Administrative & support | 2005 |
| Gwent Demolition and Construction Limited | Real estate | 1986 |
| Gwent Group Limited | Manufacturing | 2013 |
| Gym Buddy Ltd | Information & communication | 2025 |
| Haberdashers' Monmouth School Limited | Education | 2014 |
| Haberdashers' Monmouth Schools Enterprises Ltd. | Hospitality | 1983 |
| Hair by Jones (Monmouth) Ltd | Other services | 2012 |
| Hallux Podiatry Limited | Health & social care | 2013 |
| Happy Dumpling 365 Limited | Hospitality | 2021 |
| Happy Panda Limited | Hospitality | 2018 |
| Harbies Properties Limited | Real estate | 2021 |
| Hargreaves Compliance Limited | Professional & scientific | 2022 |
| Harrcon Group Limited | Construction | 2014 |
| Hartsdale Pennant Limited | Professional & scientific | 2001 |
| Hawkins Haile Limited | Administrative & support | 2005 |
| Hayes Catering Limited | Hospitality | 2002 |
| Hayes Property Limited | Real estate | 2021 |
| HBS Advisory Ltd | Professional & scientific | 2026 |
| HD Roofing Specialists Ltd | Construction | 2025 |
| HDW Geosciences Ltd | Other services | 2017 |
| Heatline Heating & Plumbing Limited | Construction | 2017 |
| Hello Designer Ltd | Other services | 2015 |
| Hendford Dent Ltd | Health & social care | 2024 |
| Hendy Agricultural Services Ltd | Agriculture & fishing | 2025 |
| Hendy Arboricultural Services Ltd | Agriculture & fishing | 2025 |
| Heythrop Properties Limited | Real estate | 2026 |
| High Temple Limited | Administrative & support | 2022 |
| High View Systems Limited | Information & communication | 2008 |
| Highway Storage Ltd | Real estate | 2023 |
| Highway Yard Ltd | Real estate | 2013 |
| Hillman Group Investments Limited | Financial services | 2023 |
| Hillside Farming Limited | Agriculture & fishing | 2026 |
| Hiraeth Escapes Limited | Hospitality | 2020 |
| HJ GEO Limited | Mining & quarrying | 2024 |
| Holdunn Trading Limited | Construction | 2025 |
| Hollands Accountancy Limited | Administrative & support | 2017 |
| Hollands Probate Limited | Professional & scientific | 2021 |
| Home Genius Ltd | Construction | 2022 |
| Honeysuckle Wood Trading Limited | Agriculture & fishing | 2018 |
| Honeywell Global Limited | Financial services | 2016 |
| Horses in Nature CIC | Agriculture & fishing | 2025 |
| Houses of Earth UK Ltd | Real estate | 2025 |
| Hub for Autism Ltd | Education | 2025 |