| Greencore Electrical & Renewable Limited | Administrative & support | 2023 |
| Greencore Recycling Limited | Water & waste | 2024 |
| Greener Global Limited | Wholesale & retail | 2025 |
| Greener Rentals & Property Management Limited | Real estate | 2013 |
| Greenfield Carers Ltd | Administrative & support | 2023 |
| Greenfield Group Holdings Limited | Construction | 2025 |
| Greenfield Imports & Exports Holdings Limited | Professional & scientific | 2019 |
| Greenfield Property Holdings Limited | Professional & scientific | 2022 |
| Greenford Asset Management Ltd | Hospitality | 2024 |
| GREENFORM83 Limited | Construction | 2024 |
| Greengate Furniture Limited | Manufacturing | 1975 |
| Greenix Limited | Administrative & support | 1996 |
| Greenkeepers Mews (Phase 3) Management Company Limited | Households | 2015 |
| Greenleaf Taurus GP Consultancy Ltd. | Health & social care | 2018 |
| Greenline Operations Ltd | Transport & logistics | 2026 |
| Greens Eyecare Ltd | Wholesale & retail | 2021 |
| GREENS3711 Limited | Households | 2022 |
| Greenscene Landscape Services Limited | Administrative & support | 2005 |
| Greenslades Limited | Professional & scientific | 2008 |
| Greenstar Plastics UK Ltd | Water & waste | 2025 |
| Greenwich Inc. Limited | Hospitality | 1993 |
| Greenwich Inc. Trading Limited | Hospitality | 2002 |
| Greenwich Inc.Holdings Limited | Professional & scientific | 2002 |
| Greg & Builders Ltd | Construction | 2013 |
| Greg 2025 Investments Ltd | Real estate | 2025 |
| Greg Courier Services Ltd | Transport & logistics | 2019 |
| Greg Your Gardner Ltd | Administrative & support | 2020 |
| Gregory Street Developments Limited | Construction | 2006 |
| Gregory Street Studios Limited | Information & communication | 2017 |
| Grema Consulting Limited | Real estate | 2014 |
| Grendon Cross Care Ltd | Other services | 2018 |
| Grendonia Consultancy Limited | Extraterritorial | 2010 |
| Grensvilla Building Co. Limited | Extraterritorial | 1959 |
| Grenville Consulting Limited | Professional & scientific | 2009 |
| Greu Construction Limited | Construction | 2024 |
| Greydale Motorsport Ltd | Administrative & support | 2022 |
| Grey’S Aesthetics Ltd | Other services | 2019 |
| GRH Consultants Limited | Professional & scientific | 2009 |
| Grham Limited | Real estate | 2024 |
| Gribit Ltd | Professional & scientific | 2025 |
| Gridmarket Energy Consulting Limited | Professional & scientific | 2025 |
| Griffin Mechanical Engineering Limited | Professional & scientific | 2025 |
| Griffiths Hearing Limited | Wholesale & retail | 2011 |
| Grigo Software Development Ltd | Information & communication | 2025 |
| Grigor Construction Limited | Construction | 2023 |
| Grigot Limited | Wholesale & retail | 2013 |
| Grijuc Aurel Ltd | Transport & logistics | 2018 |
| Grijuc&Sons Construction Ltd | Construction | 2026 |
| Grill Centrum Limited | Hospitality | 2021 |
| Grilled House Limited | Hospitality | 2025 |
| Grimey Limey Entertainment Ltd | Information & communication | 2011 |
| Grimey Limey Records Ltd | Information & communication | 2018 |
| Grimstons Ltd | Wholesale & retail | 2025 |
| Grin From Within Ltd | Administrative & support | 2009 |
| Grippi Ltd | Information & communication | 2015 |
| Gristwood Holdings Ltd | Financial services | 2026 |
| Gristwood Properties Ltd | Real estate | 2026 |
| Gron Limited | Wholesale & retail | 2020 |
| Groom Drivers Ltd | Transport & logistics | 2007 |
| Groom With a Broom Ltd | Administrative & support | 2024 |
| Groove Control DJS Limited | Arts & recreation | 2018 |
| Grosu Interior Solutions Ltd | Construction | 2019 |
| Grosvenor Accounting Limited | Professional & scientific | 2020 |
| Grosvenor Live Limited | Health & social care | 2018 |
| Grosvenor Squires Limited | Hospitality | 2024 |
| Grotus Drive Ltd | Wholesale & retail | 2026 |
| Ground Level Ltd | Construction | 2024 |
| Ground UP Developments Ltd | Administrative & support | 2017 |
| Group 12 Limited | Health & social care | 2024 |
| Groupquest Consulting Ltd | Professional & scientific | 2019 |
| Groupsis Management Limited | Wholesale & retail | 2007 |
| Grove House Trading Ltd. | Wholesale & retail | 2022 |
| Grow Pro Limited | Professional & scientific | 2023 |
| GROWIN2CARE Ltd | Health & social care | 2025 |
| Growing Edge Limited | Professional & scientific | 2017 |
| Growing Together Northampton Ltd | Health & social care | 2009 |
| Growth Kitchen Consultancy Ltd | Hospitality | 2026 |
| Growthflow Ltd | Wholesale & retail | 2025 |
| Growthhive Media Ltd | Professional & scientific | 2025 |
| GRT Glazing Limited | Construction | 2017 |
| GRT Transport Ltd | Transport & logistics | 2020 |
| Grundy Travel Group Ltd | Administrative & support | 2025 |
| Gruza Ltd | Transport & logistics | 2017 |
| Grypp Corp Limited | Information & communication | 2016 |
| GS Direct Ltd | Transport & logistics | 2022 |
| GS Private Limited | Health & social care | 2016 |
| GS8 Construction Limited | Construction | 2020 |
| GSK Market Ltd | Wholesale & retail | 2023 |
| GSM Property Solutions Ltd | Real estate | 2024 |
| GSR Accountants Limited | Professional & scientific | 2014 |
| GSS Interior Limited | Construction | 2017 |
| Gssc Academy Trust | Education | 2014 |
| Gstar Solution Ltd | Wholesale & retail | 2015 |
| GSV Solutions Ltd | Hospitality | 2024 |
| GT Agricultural Services Limited | Manufacturing | 1998 |
| GT Systems Ltd | Information & communication | 2017 |
| GTD Properties Ltd | Real estate | 2024 |
| Gtgs Logistics Ltd | Transport & logistics | 2021 |
| GTY Ltd | Transport & logistics | 2020 |
| Guaranteed Care Services Limited | Administrative & support | 2015 |