| Gili Retail Ltd | Wholesale & retail | 2019 |
| Gill Horrobin Independent Social Work Services Limited | Health & social care | 2014 |
| Gill Professional Services Limited | Administrative & support | 2016 |
| Gillard Supply Chain Intelligence Ltd | Information & communication | 2026 |
| Gillett Stephen & Company Limited | Manufacturing | 1911 |
| Gillian Ayres Holdings Ltd | Real estate | 2017 |
| Gillian Cole Associates Ltd | Real estate | 2019 |
| Gillian Court Management Limited | Hospitality | 1991 |
| Gillian Mccabe Physio Ltd | Health & social care | 2015 |
| Gillie Creative Ltd | Administrative & support | 2007 |
| Gillonmachining Limited | Manufacturing | 2014 |
| Gilmore.Rail Ltd | Construction | 2018 |
| Gimi Brand Ltd | Wholesale & retail | 2025 |
| Gimmicky Ltd | Wholesale & retail | 2025 |
| Gims Consultants Ltd | Professional & scientific | 2013 |
| GIN & Sake Cocktails Ltd | Hospitality | 2023 |
| GIN & Sake Ltd | Hospitality | 2021 |
| GIN and Sangria Ltd | Hospitality | 2024 |
| Ginger by ZOE Ltd | Other services | 2024 |
| Ginger Shop Limited | Wholesale & retail | 2023 |
| Giniras | Professional & scientific | 2023 |
| Ginix Ltd | Information & communication | 2024 |
| Ginkgotreecare Ltd | Agriculture & fishing | 2024 |
| Ginners Leisure Limited | Hospitality | 2019 |
| Ginsource Holdings Ltd | Information & communication | 2016 |
| Ginsphysio Ltd | Health & social care | 2021 |
| Gintec Estates Ltd | Real estate | 2026 |
| Gintec Holdings Ltd | Financial services | 2026 |
| Gintec Software Ltd | Information & communication | 2022 |
| GIO & SO Ltd | Real estate | 2024 |
| GIO World Health Ltd | Professional & scientific | 2021 |
| Gioant Ltd | Professional & scientific | 2020 |
| Gioblood Ltd | Professional & scientific | 2021 |
| Giordano Real Estate Ltd | Real estate | 2019 |
| Giovani Construction Ltd | Manufacturing | 2025 |
| Gipc Reserve Capital Ltd | Financial services | 2021 |
| Giran Developments & Acquisitions Ltd | Wholesale & retail | 2017 |
| Girasole Trade PC | | 2017 |
| Girexa Ltd | Information & communication | 2025 |
| Girish Private Limited | Health & social care | 2013 |
| Girl's Girl Ltd | Information & communication | 2024 |
| Girlie Crafts Ltd | Wholesale & retail | 2024 |
| Girls in Research Ltd | Education | 2024 |
| Girlz Clwb Ltd | Hospitality | 2025 |
| Girth Ltd | Hospitality | 2023 |
| Gisbey Developments Ltd | Real estate | 2016 |
| Gistpal Limited | Information & communication | 2014 |
| Gitan PC | | 2014 |
| Giuleri Ltd | Manufacturing | 2019 |
| GIZ Technologies Ltd | Information & communication | 2025 |
| Gizmofit WIT Ltd | Wholesale & retail | 2025 |
| Gizmu Limited | Wholesale & retail | 2024 |
| GJ & AD Properties Ltd | Real estate | 2025 |
| GJ Consulting Group Ltd | Professional & scientific | 2022 |
| GJ Property Cleaning Ltd | Administrative & support | 2026 |
| GJC Finance Ltd | Financial services | 2012 |
| GJD Welding Ltd | Professional & scientific | 2025 |
| GJG Consultants Ltd | Information & communication | 2010 |
| Gjgk Properties Ltd | Real estate | 2025 |
| GJO Ltd | Wholesale & retail | 2019 |
| GJP Heating Ltd | Construction | 2013 |
| GJP Planning & Development Limited | Professional & scientific | 2024 |
| GJP Wired Electrical Services Ltd | Construction | 2022 |
| GJR (Holdings) Ltd | Professional & scientific | 2014 |
| GJR Performance Solutions Ltd | Professional & scientific | 2017 |
| GJT Healthcare Ltd | Health & social care | 2018 |
| Gjuri Builders Limited | Construction | 2018 |
| GK Vills Limited | Administrative & support | 2024 |
| Gkambc Ltd | Wholesale & retail | 2024 |
| GKG Investments Ltd | Real estate | 2023 |
| GKH Consultancy Services Ltd | Information & communication | 2018 |
| GKM Healthcare Limited | Health & social care | 2019 |
| GKS Developments Ltd | Real estate | 2024 |
| GKS IT Solutions Limited | Wholesale & retail | 2016 |
| GL Electrical Cardiff Ltd | Construction | 2021 |
| Gl&K Bars Ltd | Hospitality | 2019 |
| GL1 Support Services Limited | Health & social care | 2014 |
| GLA Bathrooms&Tiling Ltd | Administrative & support | 2017 |
| GLA Groundworks Limited | Construction | 2019 |
| Glaces Enterprise Ltd | Wholesale & retail | 2015 |
| Glacier International Depository Ltd | Administrative & support | 2019 |
| Glacio Foods Limited | Wholesale & retail | 2025 |
| Glad Stone Management Ltd | Professional & scientific | 2019 |
| Gladbox Ltd | Wholesale & retail | 2025 |
| Gladding Secured Contractors PLC | Wholesale & retail | 1985 |
| Glade Systems Ltd | Information & communication | 2026 |
| Glademar Ltd | Wholesale & retail | 2025 |
| Gladiium Technology Partners Ltd | Information & communication | 2020 |
| Gladiolus Trading Limited | Administrative & support | 2020 |
| Gladyator Ltd | Hospitality | 2016 |
| Glaister Russell Developments Limited | Real estate | 2003 |
| Glam Circle Ltd | Other services | 2024 |
| Glam Estates Limited | Real estate | 2017 |
| Glam Nails & Beauty Ltd | Other services | 2017 |
| Glam Room LDN Limited | Wholesale & retail | 2020 |
| Glamdeva Ltd | Wholesale & retail | 2019 |
| Glamfit Ltd | Other services | 2025 |
| Glamglow UK Limited | Health & social care | 2025 |
| Glamore Aesthetics Ltd | Administrative & support | 2015 |
| Glamorgan Anglers Club Limited | Arts & recreation | 2001 |