| GA Innovations Ltd | Professional & scientific | 2023 |
| GA Motorcare Ltd | Wholesale & retail | 2022 |
| GA Rail Limited | Professional & scientific | 2015 |
| GA Risk Consulting Solutions Limited | Professional & scientific | 2014 |
| GA Studio Ltd | Professional & scientific | 2001 |
| GA Tarar Business Services Ltd | Wholesale & retail | 2022 |
| Gaafour Furniture Limited | Wholesale & retail | 2014 |
| Gaamf Investments Limited | Real estate | 1998 |
| Gaant Tuition Ltd | Education | 2022 |
| GAB Construction Ltd | Construction | 2015 |
| GAB Insulations Ltd | Manufacturing | 2024 |
| Gaba Enterprise Limited | Wholesale & retail | 2025 |
| Gabby & Bello Enterprises Ltd | Wholesale & retail | 2009 |
| Gabee Solutions Limited | Administrative & support | 2026 |
| Gabileon Ltd | Manufacturing | 2018 |
| Gable Construction Ltd | Construction | 2025 |
| Gabor Security LTS Ltd | Administrative & support | 2023 |
| Gabri Traders Limited | Construction | 2020 |
| Gabriel Batty Retail Limited | Wholesale & retail | 2025 |
| Gabriel DC Motorsport Ltd | Wholesale & retail | 2023 |
| Gabriel Drives Ltd | Transport & logistics | 2024 |
| Gabriel Llords Limited | Professional & scientific | 2012 |
| Gabrielle O'Hare Ltd | Arts & recreation | 2022 |
| Gabrostrat Ltd | Mining & quarrying | 2024 |
| Gabry Services Ltd | Other services | 2025 |
| GAC Logistics (UK) Limited | Wholesale & retail | 1971 |
| Gacela Commercial Limited | Real estate | 2022 |
| Gacela Group Limited | Real estate | 2016 |
| Gacela Holdings Ltd | Financial services | 2024 |
| Gacela International Ltd | Real estate | 2025 |
| Gacela Residential 1 Ltd | Real estate | 2026 |
| Gacela Residential Ltd | Real estate | 2025 |
| GAD Elite Services Ltd | Other services | 2024 |
| Gada Properties Ltd | Hospitality | 2022 |
| Gadbrook Investments Ltd | Real estate | 2026 |
| Gadbury Auto Salvage (Dismantlers) Ltd | Extraterritorial | 2021 |
| Gadbury Auto Salvage LLP | | 2005 |
| Gadbury Fold (Atherton) Management Company Limited | Households | 2006 |
| Gadbury Fold Management Company Limited | Households | 2005 |
| Gadbury Fold Residents Management Company Limited | Households | 2005 |
| Gadbury Holdings Limited | Wholesale & retail | 2024 |
| Gaddes Noble Limited | Professional & scientific | 2016 |
| Gaddoor Constructions Ltd | Construction | 2026 |
| Gaddoor Fast Food Ltd | Hospitality | 2026 |
| Gadget Bloom Ltd | Wholesale & retail | 2024 |
| Gadget Clinic Ltd | Wholesale & retail | 2016 |
| Gadget Corner Ltd | Manufacturing | 2024 |
| Gadget Glow Ltd | Wholesale & retail | 2024 |
| Gadget Master Ltd | Wholesale & retail | 2011 |
| Gadget Menders Ltd | Wholesale & retail | 2023 |
| Gadget Site Ltd | Wholesale & retail | 2025 |
| Gadgets and Vapes MCR Limited | Wholesale & retail | 2022 |
| Gadgetsmafia Ltd | Wholesale & retail | 2022 |
| Gadgia Limited | Information & communication | 2021 |
| Gadley International Co., Ltd | Manufacturing | 2025 |
| Gaelle Mokoy Coaching Ltd | Professional & scientific | 2024 |
| Gafar Motors Limited | Wholesale & retail | 2007 |
| Gaff 4 YOU Ltd | Real estate | 2025 |
| GAG Reflex Ltd. | Administrative & support | 2004 |
| Gagiel International Ltd | Administrative & support | 2022 |
| Gahana Ltd | Wholesale & retail | 2025 |
| Gahin Barber Limited | Other services | 2023 |
| Gaia Beauty Ltd | Wholesale & retail | 2025 |
| Gaia Eco Labs Ltd | Wholesale & retail | 2023 |
| Gaia Heat (Coeus) Limited | Energy | 2013 |
| Gaia Heat Limited | Energy | 2012 |
| Gaia Learning Ltd | Education | 2019 |
| Gaia's Kitchen Limited | Wholesale & retail | 2023 |
| Gaijin WOK Ltd | Hospitality | 2025 |
| Gail Mosley Productions Limited | Information & communication | 2013 |
| Gaimin.Io Limited | Extraterritorial | 2018 |
| Gain Coaching Ltd | Health & social care | 2021 |
| Gain Line Operational Optimisers Ltd | Other services | 2021 |
| Gainsboro Plus Limited | Real estate | 2017 |
| Gainsborough House (Sale) Residents Company Limited | Households | 2001 |
| Gainz Factory Ltd | Wholesale & retail | 2019 |
| Gainz Supplement Manchester Ltd | Wholesale & retail | 2025 |
| Gaity Ahmad Limited | Health & social care | 2019 |
| GAJ Construction Ltd | Construction | 2018 |
| Gajka Ltd | Manufacturing | 2024 |
| GAK Investment Holdings Limited | Financial services | 2025 |
| GAK Investment Property Limited | Real estate | 2024 |
| GAL Civil Engineering Limited | Construction | 2021 |
| Gala Seating Limited | Manufacturing | 2025 |
| Gala. Arch. Ltd. | Professional & scientific | 2015 |
| Galactic UK Comp Ltd | Wholesale & retail | 2026 |
| Galactican Limited | Professional & scientific | 2021 |
| Galacticos Kids Limited | Health & social care | 2018 |
| Galamorous Ltd | Other services | 2019 |
| Galasko Cardiac Services Limited | Health & social care | 2023 |
| Galawerk Raum Ltd | Administrative & support | 2024 |
| Galaxee Global Limited | Administrative & support | 2019 |
| Galaxy Antares Group Limited | Manufacturing | 2021 |
| Galaxy Bidco Limited | Professional & scientific | 2013 |
| Galaxy Centralised Solutions Ltd | Administrative & support | 2017 |
| Galaxy Curry & Sweet Centre Limited | Hospitality | 2011 |
| Galaxy for Trading Ltd | Wholesale & retail | 2026 |
| Galaxy Goods Ltd | Wholesale & retail | 2024 |
| Galaxy Intal Ltd | Wholesale & retail | 2013 |
| Galaxy Midco Limited | Professional & scientific | 2013 |