| Grace & Glamour Limited | Other services | 2025 |
| Grace and Joshua Property Limited | Real estate | 2022 |
| Grace House Day Nursery Limited | Health & social care | 2024 |
| Grace Little Stars Ltd | Health & social care | 2020 |
| Grace TEE Ltd | Health & social care | 2012 |
| Grace Vision Consultancy Ltd | Professional & scientific | 2012 |
| Gracechurch Contract Management Limited | Administrative & support | 2007 |
| Gracechurch Wealth Limited | Financial services | 2020 |
| Gracechurch Wealth Management LLP | | 2006 |
| Graceforrest Ltd | Professional & scientific | 2016 |
| Gracely Care Ltd | Administrative & support | 2023 |
| Gracewell House Ltd | Administrative & support | 2026 |
| Grafitti Print Limited | Manufacturing | 2019 |
| Grafton Gate MK Ltd | Real estate | 2021 |
| Grafton Global Ltd | Wholesale & retail | 2026 |
| Grafton Homes Limited | Construction | 1999 |
| Graham Adams Associates Limited | Professional & scientific | 2003 |
| Graham Price Electrical Limited | Energy | 2010 |
| Graham Systyms Ltd | Other services | 2016 |
| Graham Walker MK Limited | Wholesale & retail | 2021 |
| Grain Mediterranean Limited | Wholesale & retail | 2019 |
| GRAINRICH33 Limited | Hospitality | 2025 |
| Gralu Handyman Gardening Service Limited | Other services | 2025 |
| Gramerc Solutions Limited | Health & social care | 2014 |
| Gramm Limited | Construction | 1998 |
| Grammaticas Limited | Information & communication | 2010 |
| Gran Default Ltd | Manufacturing | 2025 |
| Granby 1960 Limited | Extraterritorial | 2014 |
| Grand Emporium Ltd | Wholesale & retail | 2022 |
| Grand Royale Cars Limited | Wholesale & retail | 2026 |
| Grand Sultan Events Limited | Hospitality | 2025 |
| Grand Union Group Funding PLC | Financial services | 2013 |
| Grand Union Plumbing & Heating Ltd | Construction | 2017 |
| Grand Union Vineyard Church Milton Keynes | Other services | 2001 |
| Grandy Holdings Ltd | Financial services | 2025 |
| Grange Close (Newton) Management Limited | Households | 2020 |
| Grange Farm Dental Practice Ltd | Health & social care | 2012 |
| Granis Consulting Ltd | Professional & scientific | 2019 |
| Granite BPO Ltd | Administrative & support | 2018 |
| Grant IT Limited | Information & communication | 2001 |
| Grant Kempster Limited | Professional & scientific | 2012 |
| Grantforshore International Limited | Wholesale & retail | 2025 |
| Grantscape | Administrative & support | 2003 |
| Grantscape Services Limited | Administrative & support | 2004 |
| Grantwood Contracts Limited | Construction | 2004 |
| Grapehub Limited | Wholesale & retail | 2019 |
| Grapey Limited | Wholesale & retail | 2023 |
| Graphcentric Ltd | Information & communication | 2025 |
| Graphene Geeks Ltd | Manufacturing | 2024 |
| Graphic West Packaging Machinery Limited | Wholesale & retail | 2000 |
| Graphics Security Ltd | Administrative & support | 2011 |
| Graphnet Health Limited | Information & communication | 1994 |
| Grass Roots Bike Trial Limited | Arts & recreation | 2026 |
| Grassfield Health & Social Limited | Other services | 2018 |
| Grassroot Development CIC | Construction | 2025 |
| Gratia Services Ltd | Health & social care | 2019 |
| Gratitude Digital Technologies Limited | Information & communication | 2021 |
| Graves & SON Ltd | Real estate | 2020 |
| Gravira Limited | Wholesale & retail | 2026 |
| Gravityhr Limited | Information & communication | 2025 |
| Gravonlabs Ltd | Information & communication | 2026 |
| Gray DOT Catalyst Limited | Professional & scientific | 2013 |
| Gray Fairlie Wealth Management Ltd | Financial services | 2024 |
| Grays Thurrock Properties Limited | Construction | 1935 |
| Graystone Security Solutions Ltd | Administrative & support | 2020 |
| Graziano Property Management Limited | Real estate | 2017 |
| GRE Logistics Limited | Transport & logistics | 2025 |
| Great APE Events Ltd | Arts & recreation | 2025 |
| Great APE Venues Ltd | Administrative & support | 2026 |
| Great Britain Table Tennis Limited | Arts & recreation | 2006 |
| Great City (UK) Ltd | Real estate | 2020 |
| Great Denham Developments Limited | Real estate | 2017 |
| Great Gelato Limited | Manufacturing | 2021 |
| Great Gelato Stony Stratford Limited | Hospitality | 2024 |
| Great Holm Management Company Limited | Households | 1985 |
| Great JIE Fashion Media Co., Ltd | Wholesale & retail | 2023 |
| Great KID (GK) Limited | Administrative & support | 2017 |
| Great Michael International Ltd | Other services | 2018 |
| Greaterby Ltd | Information & communication | 2025 |
| Greatford Holdings Ltd | Information & communication | 2003 |
| Greatfurze Ltd. | Professional & scientific | 2011 |
| Greco Properties Ltd | Real estate | 2022 |
| Greek Coffee Ltd | Hospitality | 2026 |
| Greek Family Ltd | Hospitality | 2025 |
| Greek Grill Cafe Limited | Hospitality | 2014 |
| Greek Souvlaki MK Ltd | Hospitality | 2024 |
| Greek Takeaway Ltd | Hospitality | 2023 |
| Green 13 Tattoo Limited | Other services | 2023 |
| Green Circle Developments Ltd | Real estate | 2015 |
| Green Compass Consultancy Ltd | Professional & scientific | 2021 |
| Green Compost Services Limited | Water & waste | 2001 |
| Green Deels Ltd | Hospitality | 2023 |
| Green Employment Services Ltd | Administrative & support | 2023 |
| Green Energy Efficiency Ltd | Construction | 2021 |
| Green First Developments Ltd | Construction | 2025 |
| Green FOX Cleaning Barns Limited | Administrative & support | 2023 |
| Green Gates Equestrian Limited | Arts & recreation | 2016 |
| Green Hill Sports Ltd | Wholesale & retail | 2023 |
| Green Lane Flats (Wolverton) Ltd | Construction | 2022 |
| Green Laptops Ltd | Other services | 2024 |