| Gritspace Ltd | Professional & scientific | 2025 |
| Gritstone Adventure Activities Limited | Education | 2018 |
| Gritstone Engineering Services Limited | Manufacturing | 2008 |
| Gritstone Financial Planning Limited | Financial services | 2017 |
| Gritstone Games Ltd | Information & communication | 2021 |
| Gritstone Group Limited | Real estate | 2024 |
| Gritstone Holdings Ltd | Real estate | 2025 |
| Gritstone Properties Limited | Real estate | 2019 |
| Gritstone Property Limited | Real estate | 2024 |
| GRM Fitness Ltd | Arts & recreation | 2021 |
| GRO Cloud Ltd | Professional & scientific | 2026 |
| Grobotic Systems Limited | Wholesale & retail | 2018 |
| Grocify Limited | Wholesale & retail | 2023 |
| Groco 607 Limited | Extraterritorial | 2024 |
| Groh Care & Staffing Solutions Ltd | Education | 2017 |
| Groke Coffee Ltd | Hospitality | 2024 |
| Groove Films Ltd | Information & communication | 2023 |
| Groover Ltd | Wholesale & retail | 2026 |
| Grosvenor (House Builders) Ltd | Construction | 2016 |
| Ground Support Services (UK) Ltd | Construction | 2006 |
| Ground That IS Common Limited | Information & communication | 2020 |
| Ground UP Audio Limited | Arts & recreation | 2021 |
| Ground UP Land and Build Ltd | Construction | 2022 |
| Ground-Speed Projects Limited | Hospitality | 2016 |
| Groundbreaking Solutions Building Ltd | Manufacturing | 2025 |
| Groundbreaking Solutions Ltd | Construction | 2025 |
| Groundhog Day Ltd | Professional & scientific | 2018 |
| Groundwork Communications Limited | Arts & recreation | 2012 |
| Groundwork Gardening Services Limited | Administrative & support | 2025 |
| Group 977 Ltd | Administrative & support | 2019 |
| Group IT Ltd | Information & communication | 2002 |
| Grousemoor Engineering Ltd | Professional & scientific | 2015 |
| Grove Cost Management Ltd | Professional & scientific | 2021 |
| Grovebury Asset Management Limited | Construction | 1961 |
| Grow Gardens & Landscaping CIC | Administrative & support | 2026 |
| Grow ME Ltd | Other services | 2013 |
| Grow ME Trees Ltd | Agriculture & fishing | 2024 |
| Grow Network Limited | Wholesale & retail | 2025 |
| Growers ARK Ltd | Manufacturing | 2006 |
| Growing Circles Limited | Professional & scientific | 2022 |
| Growing Forward CIC | Health & social care | 2021 |
| Growing Yorkshire Ltd | Professional & scientific | 2023 |
| Growmore Crops Limited | Agriculture & fishing | 2024 |
| Growth LED Innovation Driven Employee Company Ltd | Professional & scientific | 2011 |
| Growth-Iq Ltd | Administrative & support | 2025 |
| Growtheatre CIC | Arts & recreation | 2012 |
| Grub Records Ltd | Wholesale & retail | 2023 |
| Grub Wine Ltd | Hospitality | 2024 |
| Grum Dog Grooming Ltd | Other services | 2025 |
| Grumpy Gramps Enterprises Ltd | Hospitality | 2022 |
| Gryd Ltd | Manufacturing | 2025 |
| GS Access Plumbing & Heating Ltd | Other services | 2021 |
| GS Builders (Sheffield) Limited | Construction | 2005 |
| GS Integra Limited | Professional & scientific | 2014 |
| GSB Auto Repairs Limited | Wholesale & retail | 2024 |
| GSH Retail Ltd | Wholesale & retail | 2005 |
| GSM Media Ltd | Administrative & support | 2014 |
| GSR Building Ltd | Construction | 2021 |
| GSW Scaffolding Ltd | Construction | 2015 |
| GSW Support Ltd | Administrative & support | 2015 |
| GT Family Ltd | Wholesale & retail | 2024 |
| GT GAS Installations Limited | Construction | 2013 |
| GT Gynaecology Services Limited | Health & social care | 2022 |
| GT Home Assistance Limited | Construction | 2025 |
| GT Machinery Limited | Wholesale & retail | 2000 |
| GT Motoring Solutions Limited | Wholesale & retail | 2010 |
| GT Private Healthcare Ltd | Financial services | 2023 |
| Gt&Co Logistics Ltd | Transport & logistics | 2025 |
| GT10 Ltd | Arts & recreation | 2022 |
| GT2025 Limited | Real estate | 2025 |
| GTI Accessories and Tours Ltd | Wholesale & retail | 2026 |
| GTN Corporation Ltd | Professional & scientific | 2025 |
| GTR (Yorkshire) Ltd | Construction | 2023 |
| GTR and SON Ltd | Manufacturing | 2012 |
| GTS Environmental Limited | Extraterritorial | 2014 |
| GTS Glass & Window Services Ltd | Construction | 2026 |
| GTS Maintenance Limited | Manufacturing | 1997 |
| GTS Maintenance Services Limited | Real estate | 2006 |
| GTS Nitrogen Services Limited | Other services | 2011 |
| GTS Residential Management Limited | Real estate | 2025 |
| GTW Green Motor Engineering Ltd | Manufacturing | 2020 |
| GTZ Properties Ltd | Real estate | 2019 |
| GU Consulting Limited | Professional & scientific | 2025 |
| Guardian Roofing Ltd | Construction | 2026 |
| Guest Home Away Limited | Hospitality | 2021 |
| Guest Nest Properties Ltd | Real estate | 2026 |
| Guested Ltd | Real estate | 2022 |
| Gugu Media Ltd | Professional & scientific | 2025 |
| Gugu Trading Ltd | Wholesale & retail | 2025 |
| Gugu Vision Ltd | Professional & scientific | 2025 |
| GUI & Chen Properties Limited | Real estate | 2022 |
| Guidance Peak Limited | Information & communication | 2025 |
| Guided Growth Sales Ltd | Professional & scientific | 2022 |
| Guidedata Limited | Information & communication | 1986 |
| Guild of St.George(The) | Health & social care | 1878 |
| Guilds Acre Residential Sales Lettings Investments Management Developments Limited | Real estate | 2024 |
| Guildstone Associates Limited | Transport & logistics | 2017 |
| Guilthwaite Hall Limited | Extraterritorial | 2013 |
| Guilthwaite Limited | Extraterritorial | 2013 |
| Gujani Limited | Manufacturing | 2018 |