| Gapn Ltd | Wholesale & retail | 2024 |
| Gara Services Limited | Wholesale & retail | 2025 |
| Garabys Limited | Real estate | 2009 |
| Garage Buyer Ltd | Real estate | 2018 |
| Garan Holdings Limited | Professional & scientific | 2008 |
| Garan Instruments Limited | Wholesale & retail | 2003 |
| Garan Property Limited | Real estate | 2008 |
| Garcha Builders Construction Ltd | Construction | 2019 |
| Garde Roofing Supplies Limited | Wholesale & retail | 2017 |
| Garden Creative Construction Ltd | Construction | 2020 |
| Garden Envy NW Ltd | Administrative & support | 2017 |
| Garden Gate Homes Limited | | 1988 |
| Garden HCW Ltd | Other services | 2015 |
| Garden Pride Landscapes Ltd | Administrative & support | 2022 |
| Garden Room Builders Ltd | Manufacturing | 2026 |
| Garden UP Ltd | Administrative & support | 2013 |
| Garden Village Motors Limited | Wholesale & retail | 2021 |
| Gardiner VTX Ltd | Wholesale & retail | 2025 |
| Gardiner-Whites Limited | Wholesale & retail | 2017 |
| Gardn Ltd | Professional & scientific | 2019 |
| Gardner Air Services Limited | Energy | 1998 |
| Gardner Construction Consultants Ltd | Professional & scientific | 2024 |
| Gardner Llewelyn Associates Limited | Administrative & support | 2006 |
| Gardners Patch Ltd | Wholesale & retail | 2020 |
| Gareth Bancroft Limited | Real estate | 2016 |
| Gareth Brown Urology Ltd | Health & social care | 2018 |
| Gareth Jenkins Locum Limited | Health & social care | 2012 |
| Gareth L Edwards Estates Limited | Real estate | 2018 |
| Gareth Thomas Ltd | Wholesale & retail | 2016 |
| Gareth WYN Roberts Limited | Information & communication | 2011 |
| Garez Ltd | Professional & scientific | 2020 |
| Garks Ltd | Hospitality | 2025 |
| Garlands of Llandaff Ltd | Wholesale & retail | 2017 |
| Garreg DDU Ltd | Hospitality | 2022 |
| Garreg Fawr Energy Park Limited | Energy | 2020 |
| Garrison Barclay Estates Limited | Real estate | 2016 |
| Garrison Projects Limited | Construction | 2026 |
| Garrod Technical Services Ltd | Construction | 2018 |
| Garry Nyhan Painter and Decorator Ltd | Construction | 2022 |
| Garsea 1003 Property Management Limited | Extraterritorial | 2011 |
| Garth Limited | Real estate | 1986 |
| Garth Mountain PUB Company Ltd | Hospitality | 2018 |
| Garth Resources Ltd | Transport & logistics | 1985 |
| Garth Training & Events Ltd | Administrative & support | 2020 |
| Gartmore Holdings Limited | Information & communication | 2018 |
| Garvy Limited | Information & communication | 2025 |
| Garwill Consultancy Limited | Professional & scientific | 2010 |
| Gary Anthony Limited | Real estate | 2001 |
| Gary Mcconnell Ltd | Wholesale & retail | 2026 |
| Gary Nelson TM Ltd | Other services | 2020 |
| Gary Owen CYF | Information & communication | 2026 |
| GAS Electrics Ltd | Construction | 2017 |
| GAS NRG Ltd | Wholesale & retail | 2023 |
| GAS Pro Eco Ltd | Construction | 2022 |
| GAS Pubs Ltd | Hospitality | 2019 |
| GAS Safety Certificate London Ltd | Construction | 2017 |
| GAS Solution Asia Ltd | Wholesale & retail | 2025 |
| Gashnjani Ltd | Manufacturing | 2025 |
| Gaspark Heating Solutions Ltd | Construction | 2022 |
| Gaspark Solutions Limited | Construction | 2015 |
| Gastech Plumbing and Heating Ltd | Construction | 2019 |
| Gastro Food Ltd | Financial services | 2023 |
| Gastro Synergy Ltd | Hospitality | 2014 |
| Gastroenterology Clinic (Wales) Limited | Health & social care | 2006 |
| GAT Consultancy Limited | Professional & scientific | 2023 |
| Gate Investment UK. Ltd | Financial services | 2021 |
| Gate Run Systems Ltd | Information & communication | 2025 |
| Gate Smart Ltd | Manufacturing | 2019 |
| Gate Systems Limited | Construction | 2017 |
| Gate Trust Limited | Arts & recreation | 2000 |
| Gate View Data Ltd | Information & communication | 2025 |
| GATE1 Driving Services Limited | Manufacturing | 2018 |
| Gatecrasher Limited | Hospitality | 2012 |
| Gatekeeper Security Services Limited | Administrative & support | 2010 |
| Gates Guards Services Ltd | Administrative & support | 2005 |
| Gates Psychology Ltd | Education | 2024 |
| Gatestone Group UK Limited | Professional & scientific | 2023 |
| Gateway 2 Conveyancing Limited | Professional & scientific | 2020 |
| Gateway Cleaning Services Ltd | Administrative & support | 2019 |
| Gateway Financial Consulting Ltd | Financial services | 2007 |
| Gateway International College Limited | Education | 2018 |
| Gateway One Solutions Ltd | Information & communication | 2025 |
| Gateway Plus Ltd | Information & communication | 2015 |
| Gateway Prime Ventures Ltd | Professional & scientific | 2018 |
| Gateway Security & Training Limited | Administrative & support | 2021 |
| Gatewear Group Ltd | Wholesale & retail | 2024 |
| Gatewynn Limited | Health & social care | 2024 |
| Gatget Ltd | Professional & scientific | 2010 |
| Gatherdream Limited | Wholesale & retail | 2025 |
| Gathersphere Events Ltd | Administrative & support | 2025 |
| Gatr Holdings Ltd | Financial services | 2024 |
| Gatr Limited | Health & social care | 2019 |
| Gatsby Capital Ltd | Financial services | 2026 |
| Gatsby Tech Ltd | Information & communication | 2023 |
| Gatta Star Group Ltd | Construction | 2018 |
| Gatwick Garden Hotel Ltd | Hospitality | 2022 |
| Gaudium Ltd | Health & social care | 2012 |
| Gaule Limited | Health & social care | 2015 |
| Gaunt Francis Architects Limited | Professional & scientific | 2011 |
| Gaur Ltd | Health & social care | 2015 |