| G V Joy Ltd | Health & social care | 2017 |
| G W Pipe Services Ltd | Construction | 2018 |
| G Ward Ltd | Real estate | 2025 |
| G Winter Trading Ltd | Wholesale & retail | 2026 |
| G&D Unique Childcare Provider Ltd | Health & social care | 2020 |
| G&E Mcintyres Limited | Other services | 2015 |
| G&G Glass Ltd | Construction | 2017 |
| G&G Trading Limited | Wholesale & retail | 2024 |
| G&T Developments Ltd | Construction | 2023 |
| G. Mallinson Holdings Limited | Manufacturing | 2019 |
| G. W. Clark (Joinery) Ltd | Construction | 2009 |
| G.A.Sharpe Limited | Wholesale & retail | 1946 |
| G.D.S. Educational Services Ltd | Health & social care | 2015 |
| G.G.R. Corporation Ltd | Professional & scientific | 2010 |
| G.G.R. Enterprises Ltd | Financial services | 2024 |
| G.J.E. Controls Limited | Professional & scientific | 2012 |
| G.M. Davies Transport Management Ltd | Professional & scientific | 2024 |
| G.M.Electrical (Royton) Ltd | Construction | 2015 |
| G.R. Labels Limited | Manufacturing | 1991 |
| G5 Design Oldham Limited | Professional & scientific | 2014 |
| GA2R Limited | Real estate | 2018 |
| Gaantfootball Limited | Manufacturing | 2023 |
| Gabiznis Enterprises Ltd | Wholesale & retail | 2025 |
| Gach Limited | Real estate | 2021 |
| Gadget Cheap Ltd | Wholesale & retail | 2020 |
| Gadgets 4 U Oldham Limited | Manufacturing | 2025 |
| Gadgets People Ltd | Other services | 2014 |
| GAF Electrics Ltd | Construction | 2023 |
| Gaffney Sprinkler Solutions Limited | Construction | 2023 |
| Gail Building and Roofing Ltd | Construction | 2022 |
| Galaxium Ltd | Wholesale & retail | 2026 |
| Galaxy Auto Trader Ltd | Wholesale & retail | 2026 |
| Galaxy UK Properties Ltd | Real estate | 2021 |
| Galaxy UK Real Estate Ltd | Real estate | 2017 |
| Galisia Ltd | Construction | 2021 |
| Gallcon Homes Limited | Construction | 2019 |
| Gallcon Investments Limited | Real estate | 2022 |
| Gallery Glass Auto Ltd | Extraterritorial | 2025 |
| Galli Pods Limited | Hospitality | 2026 |
| Gamble King and Noone Ltd | Construction | 2013 |
| Game on Competitions Ltd | Other services | 2025 |
| Gameplay Events Limited | Extraterritorial | 2021 |
| Gandtrack Properties Limited | Real estate | 2018 |
| Ganesh Amma SAI Ltd | Real estate | 2020 |
| Gaps Land Development LLP | | 2017 |
| Gara-Store Limited | Real estate | 2024 |
| Gardauk Ltd | Wholesale & retail | 2025 |
| Garden & House Services Ltd | Administrative & support | 2026 |
| Gardencare (Oldham) Ltd | Other services | 2013 |
| Gardengo Ltd | Administrative & support | 2025 |
| Garner Property Group Ltd | Real estate | 2016 |
| Garrswood Limited | Wholesale & retail | 2025 |
| Gary E Collier Electrical Limited | Construction | 2014 |
| Gary Mccabe C.I.T.I Limited | Construction | 2009 |
| Gary Prescott & Sons Limited | Real estate | 2020 |
| GAS Check MH Ltd | Construction | 2018 |
| Gask Management Services Ltd | Professional & scientific | 2011 |
| Gaskells Property Maintenance Ltd | Households | 2022 |
| Gate Inn Diggle Ltd | Hospitality | 2022 |
| Gatehead House Management Company Limited | Households | 1984 |
| Gater Cafe Co Ltd | Hospitality | 2023 |
| Gateway Prop MM Ltd | Real estate | 2017 |
| Gather Kitchen Design Ltd | Wholesale & retail | 2024 |
| Gathered for YOU Ltd | Wholesale & retail | 2018 |
| Gatto Pizza Limited | Hospitality | 2026 |
| Gavin Scott Installations Limited | Manufacturing | 2015 |
| Gayas Service Limited | Health & social care | 2015 |
| Gazey Developments Limited | Construction | 2013 |
| Gazzard and Co Limited | Extraterritorial | 2014 |
| GB Storage Ltd | Real estate | 2020 |
| Gbfandcgroup Limited | Mining & quarrying | 2024 |
| GBR Property Maintenance Ltd | Construction | 2025 |
| GBS Accident Repairs Ltd | Wholesale & retail | 2015 |
| GC Home Improvements (Midlands) Ltd | Construction | 2025 |
| GCH Ltd. | Administrative & support | 2017 |
| Gcuoba UK & Eire Ltd | Education | 2024 |
| Gcuoba UK and Ireland Ltd | Education | 2024 |
| Gcvss(Global Cardiovascular Surgical Services ) Limited | Health & social care | 2016 |
| GDB Joinery Limited | Construction | 2022 |
| Gdco 3 LLP | | 2013 |
| GDH Property & Consultants Ltd | Real estate | 2024 |
| Gdwlegal Limited | Professional & scientific | 2023 |
| Gear Next GEN Ltd | Wholesale & retail | 2025 |
| Gebress Ltd | Wholesale & retail | 2020 |
| GEC Installation and Glazing Services Ltd | Construction | 2019 |
| Geci Gorton Ltd | Administrative & support | 2019 |
| Geepee Ltd | Health & social care | 2021 |
| Geese Limited | Professional & scientific | 2023 |
| Geko Energy Ltd | Professional & scientific | 2024 |
| GEL Recruitment Ltd. | Administrative & support | 2012 |
| Gemcart Ltd | Wholesale & retail | 2024 |
| Gemini Building Services Ltd | Construction | 2026 |
| Gemini Distributions Limited | Wholesale & retail | 2025 |
| Gemini Traders Ltd | Wholesale & retail | 2019 |
| Gems EMS Ltd | Professional & scientific | 2024 |
| General Breakers Ltd | Wholesale & retail | 2024 |
| General Delights Ltd | Wholesale & retail | 2026 |
| General Mediation Ltd. | Transport & logistics | 2022 |
| General Petroleum International Limited | Wholesale & retail | 2024 |
| General UK Trading Ltd | Professional & scientific | 2010 |