| Glass Box Enterprises Ltd | Hospitality | 2025 |
| Glass Containers UK Ltd | Wholesale & retail | 2026 |
| Glass Estates Limited | Real estate | 2007 |
| Glass EYE Ltd. | Professional & scientific | 2010 |
| Glass House Birmingham Ltd | Manufacturing | 2018 |
| Glass Smart Limited | Construction | 2010 |
| Glass Wall Installations Ltd | Construction | 2018 |
| Glassconstruction Ltd | Construction | 2016 |
| Glassfibre Building Products Limited | Manufacturing | 1987 |
| Glasshouse Beer Co Ltd | Manufacturing | 2016 |
| Glassmullan Limited | Real estate | 2025 |
| Glasso Afoofa Publishing Ltd | Information & communication | 2010 |
| Glasstech Limited | Extraterritorial | 1987 |
| Glasswater Investors Ltd | Real estate | 2024 |
| Glasswork UK (1958) Ltd | Manufacturing | 2026 |
| Glasswork UK (Bham) Ltd | Manufacturing | 2025 |
| Glautrifoll Ltd | Administrative & support | 2021 |
| Glaze Auto Parts Limited | Wholesale & retail | 2000 |
| Glaze Room Ltd | Manufacturing | 2024 |
| Glazed Window Systems Limited | Manufacturing | 2025 |
| Glds Services Ltd | Construction | 2025 |
| GLE Auto Trader Limited | Wholesale & retail | 2022 |
| Gleambit Limited | Information & communication | 2025 |
| Gleaming Dynamics Limited | Administrative & support | 2025 |
| Glebe Farm Convenience Ltd | Wholesale & retail | 2018 |
| Glebe Farm Trust C.I.C. | Health & social care | 2017 |
| Glebe Meadows (Falfield) Management Company Limited | Households | 2024 |
| Glebe Preservations Limited | Professional & scientific | 1998 |
| Glebe Trading Ltd | Wholesale & retail | 2025 |
| Glebeland Limited | Financial services | 2004 |
| Gleeson Futures Limited | Administrative & support | 2019 |
| Gleeson International Limited | Professional & scientific | 2021 |
| Gleeson Medical Training Services Ltd | Education | 2025 |
| Gleeson Recruitment Ltd | Administrative & support | 2011 |
| Glen Cosy Homes Ltd | Construction | 2021 |
| Glen Lane Limited | Other services | 2022 |
| Glen Plastic Ltd | Other services | 2019 |
| Glen Stays Ltd | Real estate | 2026 |
| Glenco International Limited | Manufacturing | 1988 |
| Glencross Scaffolding Limited | Construction | 2017 |
| Glendale Garden and Leisure Limited | Manufacturing | 1980 |
| Glendawn Ltd | Wholesale & retail | 2024 |
| Glendenning Mouldings Limited | Manufacturing | 2007 |
| Glendyne Investments Ltd | Real estate | 2013 |
| Gleneagles Properties Ltd | Real estate | 2025 |
| Glenelg SIX Limited | Real estate | 2022 |
| Glenfield House Nursing Home Limited | Health & social care | 2012 |
| Glenlorn Limited | Wholesale & retail | 2025 |
| Glenmarsh Properties Limited | Households | 2023 |
| Glenmire Properties Limited | Administrative & support | 2024 |
| Glenn Howells Architects (London) Ltd | Professional & scientific | 2012 |
| Glenn Howells Architects Limited | Professional & scientific | 2000 |
| Glenniston Solar Project Ltd | Energy | 2021 |
| Glenoshiri Properties Limited | Administrative & support | 2024 |
| Glenpark Property Limited | Other services | 2021 |
| Glenroy Jefferson Alexis, Ltd | Professional & scientific | 2023 |
| Glens Property Managements Ltd | Real estate | 2026 |
| Glensarit Properties Limited | Households | 2026 |
| Glenson (Holdings) Limited | Professional & scientific | 1975 |
| Glenson Limited | Extraterritorial | 1996 |
| Glentworth Properties Ltd | Construction | 2024 |
| Glenville Care Limited | Health & social care | 2019 |
| GLI Derby Limited | Real estate | 2025 |
| GLI Trinity III Limited | Real estate | 2026 |
| GLI Trinity Limited | Real estate | 2025 |
| Glide 2 Limited | Energy | 2010 |
| Glide Bidco 2 Limited | Financial services | 2014 |
| Glide Bidco Limited | Information & communication | 2013 |
| Glide Business Limited | Professional & scientific | 2008 |
| Glide Fibre Limited | Administrative & support | 2010 |
| Glide Holdings Limited | Information & communication | 2007 |
| Glide Student & Residential Limited | Information & communication | 1996 |
| Glide Systems Ltd | Information & communication | 2025 |
| Glide Topco Limited | Information & communication | 2013 |
| Glide Utilities Limited | Energy | 2007 |
| Glidestone Paving & Landscaping Ltd | Construction | 2016 |
| Gliim Limited | Wholesale & retail | 2026 |
| Glimmerguru Ltd | Administrative & support | 2025 |
| Glimpse Glow Limited | Wholesale & retail | 2025 |
| Glimpse Opticians Limited | Wholesale & retail | 2016 |
| Glimsy Ltd | Wholesale & retail | 2025 |
| Glint Cleaning Solutions Ltd | Administrative & support | 2020 |
| Glioflux Limited | Wholesale & retail | 2023 |
| Glitch.Cool Ltd | Information & communication | 2024 |
| Glitter & Sparkles Ltd | Wholesale & retail | 2020 |
| Glitter Monkeys Limited | Financial services | 2024 |
| Glitter Nails & Makeup Ltd | Other services | 2023 |
| Glitter Salon Ltd | Other services | 2026 |
| Glittering Treasures Ltd | Construction | 2026 |
| Glitters & Gold Ltd | Wholesale & retail | 2024 |
| Glitz Accezzoriez Limited | Wholesale & retail | 2003 |
| Glitz Decorators Ltd | Construction | 2025 |
| Glitz Salon Ltd | Other services | 2021 |
| Glitz Style Salon Ltd | Other services | 2025 |
| GLM Educational Trust | Education | 2012 |
| GLM Homes Limited | Real estate | 2025 |
| GLM Security Ltd | Administrative & support | 2024 |
| GLO Live Agency Ltd | Information & communication | 2025 |
| Gloag and Daughters Ltd | Professional & scientific | 2025 |
| Global 20 Film Production Ltd | Information & communication | 2025 |