| Gabriel Karlsen Limited | Extraterritorial | 2025 |
| Gabriel Munteanu Ltd | Administrative & support | 2018 |
| Gabriel Serban Ltd | Construction | 2017 |
| Gabriella Cugno Patissier & Chocolatier Limited | Hospitality | 2021 |
| Gabrob Construction Ltd | Construction | 2019 |
| Gabryfast Ltd | Transport & logistics | 2024 |
| Gabso Consulting Ltd | Professional & scientific | 2019 |
| GAD Online Ltd | Wholesale & retail | 2026 |
| GAD Works Ltd | Information & communication | 2024 |
| Gadag Clinical Data UK Research Divestiture Ltd | Professional & scientific | 2018 |
| Gadeon Group Ltd | Health & social care | 2026 |
| Gadgetmedia Limited | Information & communication | 2006 |
| Gadgets Hub Ltd | Manufacturing | 2021 |
| Gadgette Limited | Information & communication | 2019 |
| GAF Forex Ltd | Professional & scientific | 2021 |
| Gaffneyjorge Ltd | Transport & logistics | 2025 |
| Gafur Accounting & Advisory Ltd | Professional & scientific | 2021 |
| Gagan Malik Limited | Information & communication | 2022 |
| Gagglebabble | Arts & recreation | 2016 |
| Gaia Commercial Real Estate UK Ltd | Real estate | 2025 |
| Gaia Solarworks Ltd | Construction | 2025 |
| Gaia Tribe Ltd | Wholesale & retail | 2018 |
| Gaiaom Ltd | Manufacturing | 2025 |
| Gaiapay Ltd | Professional & scientific | 2019 |
| Gain IDM Ltd | Wholesale & retail | 2025 |
| Gain Invst Limited | Construction | 2022 |
| Gain Loyalty Limited | Information & communication | 2015 |
| Gain Social Media Ltd | Professional & scientific | 2018 |
| Gaincore Ltd | Wholesale & retail | 2025 |
| Gaknobi Hospitality Solutions Ltd | Administrative & support | 2017 |
| Gala Labs Ltd | Information & communication | 2021 |
| Galaagan Ltd | Transport & logistics | 2020 |
| Galaeth Homes Ltd | Real estate | 2024 |
| Galahad (Thornhill) Management Company Limited | Households | 1982 |
| Galaxy Digital Entertainment Limited | Information & communication | 2021 |
| Galaxy Lettings Group Ltd | Real estate | 2020 |
| Galaxy Scaffolding UK Ltd | Construction | 2015 |
| Galaxy Shopfitting Limited | Construction | 2000 |
| Galaxy Space Athletic CIC | Arts & recreation | 2019 |
| Galaxy Workforce Ltd | Administrative & support | 2016 |
| Galaxy-Tec Limited | Wholesale & retail | 2015 |
| Galaxymooneditions Ltd | Information & communication | 2021 |
| Galco Group Limited | Professional & scientific | 1996 |
| Gale Plumbing Installations Limited | Construction | 2019 |
| Gale's Product Consultancy Limited | Professional & scientific | 2026 |
| Galeria Laitan Ltd | Arts & recreation | 2025 |
| Gali Podcasts Ltd | Information & communication | 2026 |
| Galileo 03 Limited | Energy | 2022 |
| Galileo 06 Limited | Energy | 2023 |
| Galileo 08 Limited | Energy | 2023 |
| Galileo 09 Limited | Energy | 2023 |
| Galileo 14 Limited | Energy | 2023 |
| Galileo 15 Limited | Energy | 2023 |
| Galileo 24 Limited | Energy | 2024 |
| Galileo 25 Limited | Energy | 2024 |
| Galileo Empower Renewables Limited | Energy | 2024 |
| Galileo Empower Wales Limited | Energy | 2021 |
| Gallant Services Ltd | Administrative & support | 2018 |
| Gallarii Limited | Arts & recreation | 2017 |
| Galleriahub Ltd | Wholesale & retail | 2025 |
| Gallery Security Services Ltd | Administrative & support | 2020 |
| Gallery/Ten Ltd | Wholesale & retail | 2012 |
| Galles Media Ltd | Information & communication | 2024 |
| Gallimore Property Limited | Real estate | 2018 |
| Gallivan Childcare Solutions Limited | Education | 2006 |
| Gallois Services Limited | Administrative & support | 2010 |
| Gallom Estates Limited | Real estate | 2020 |
| Gallowave Ltd | Information & communication | 2024 |
| Galloway Pearl Consultants Ltd | Professional & scientific | 2018 |
| Galofi Services Ltd | Administrative & support | 2021 |
| Galtonwest Limited | Health & social care | 2021 |
| Galvablast Limited | Manufacturing | 1995 |
| Galway Groundworks London Limited | Construction | 2018 |
| GAM Property Services Limited | Real estate | 2024 |
| Gamal Abdulnaser and Partner Company for Business Ltd | Financial services | 2025 |
| Gambari Ltd | Information & communication | 2018 |
| Game Direct Ltd | Wholesale & retail | 2016 |
| Game Panel Limited | Information & communication | 2020 |
| Game Specialist Ltd | Wholesale & retail | 2021 |
| Game Station BUS Ltd | Other services | 2024 |
| Game Systems International Limited | Arts & recreation | 2004 |
| Gameback Ltd | Manufacturing | 2023 |
| Gamebox Stop Ltd | Wholesale & retail | 2025 |
| Gameflow Ltd | Wholesale & retail | 2025 |
| Gamekeeper Ltd | Hospitality | 2023 |
| Games Radar Ltd | Other services | 2019 |
| Gameskins Limited | Wholesale & retail | 2023 |
| Gamezillar Limited | Information & communication | 2018 |
| Gami Home Store Ltd | Wholesale & retail | 2025 |
| Gaming Audio Ltd | Wholesale & retail | 2020 |
| Gaming Party Van Limited | Arts & recreation | 2020 |
| Gamingtheme Ltd | Other services | 2025 |
| Gandif Ltd | Real estate | 2019 |
| Ganesh Properties Ltd | Real estate | 2025 |
| Gang WEI Limited | Wholesale & retail | 2025 |
| Gangtie Heli Ltd | Wholesale & retail | 2026 |
| Ganshoukuoda Trade Ltd | Wholesale & retail | 2024 |
| Gansi Home Real Estates Ltd | Real estate | 2026 |
| Ganz Medizin Energie Praxis Ltd | Health & social care | 2019 |
| Gapfillers Limited | Professional & scientific | 2001 |