| Guardian Investments Limited | Financial services | 2026 |
| Guardian Maintenance Limited | Energy | 2009 |
| Guardian Shield Doors Ltd | Manufacturing | 2025 |
| Guardians of Development Ltd | Health & social care | 2023 |
| Guarding Nation Limited | Information & communication | 2024 |
| Gubblecote Ltd | Wholesale & retail | 2016 |
| Gudsen Technology UK Limited | Wholesale & retail | 2024 |
| Guentert & Guentert Ltd | Professional & scientific | 2011 |
| Guestpot Hub C.I.C. | Real estate | 2025 |
| Guhg Development Company Limited | Professional & scientific | 2015 |
| Guided Clothing Ltd | Wholesale & retail | 2026 |
| Guilford Publications (UK) Limited | Information & communication | 2016 |
| Guist General Store Ltd | Wholesale & retail | 2013 |
| Guizani Limited | Hospitality | 2024 |
| Gujraj Limited | Hospitality | 2025 |
| Gulf Racing (UK) Ltd | Financial services | 2011 |
| Gulfstride Limited | Real estate | 2020 |
| Gulliver Test Consultants Ltd | Information & communication | 2023 |
| Gummo Events Limited | Information & communication | 2025 |
| Gunayuk Limited | Hospitality | 2009 |
| GUO Shuai KJ Ltd. | Wholesale & retail | 2025 |
| GUO WEI KU Ltd. | Wholesale & retail | 2025 |
| GUO WEN Yang Ltd. | Wholesale & retail | 2025 |
| GUO XIN Yang Ltd. | Wholesale & retail | 2025 |
| GUO XU Yang Ltd. | Wholesale & retail | 2025 |
| Gurghis Ltd | Wholesale & retail | 2025 |
| Gurkha Groceries Ltd | Wholesale & retail | 2017 |
| Guru Dhan Sampada Limited | Real estate | 2024 |
| Gusan Construction Ltd | Construction | 2018 |
| Gutt Ltd | Manufacturing | 2025 |
| GUV Limited | Wholesale & retail | 2004 |
| GUY Jones Lighting Limited | Arts & recreation | 2016 |
| GUY Motors Ltd | Manufacturing | 2022 |
| Guys 'N' Dolls MK Limited | Other services | 2004 |
| GVR Softech Ltd | Information & communication | 2011 |
| GW (Dalston Comm) Limited | Real estate | 2020 |
| GW (Dalston Resi) Limited | Real estate | 2022 |
| GW (Longwick) Limited | Construction | 2021 |
| GW COX Cranes Ltd | Construction | 2014 |
| GW Industry Solutions Ltd | Administrative & support | 2026 |
| GW Property Development Limited | Construction | 2006 |
| GW Trans Ltd | Transport & logistics | 2020 |
| GWE Engineering Ltd | Manufacturing | 2014 |
| GWH Salon Ltd | Other services | 2025 |
| Gwladys Street Ltd | Real estate | 2021 |
| Gxhaus Ltd | Wholesale & retail | 2024 |
| Gyaesu UK Ltd | Health & social care | 2023 |
| GYF Limited | Real estate | 2020 |
| Gym Boss Ltd | Wholesale & retail | 2025 |
| Gym Plus Coffee UK Ltd | Wholesale & retail | 2021 |
| Gym Wingman Ltd | Health & social care | 2021 |
| Gymfinity Kids Limited | Arts & recreation | 2016 |
| Gynagyimah Cleaning Services Limited | Administrative & support | 2026 |
| Gypsum Contracts Limited | Construction | 2022 |
| Gysin Consulting Limited | Professional & scientific | 2018 |
| Gytrash Ltd | Arts & recreation | 2013 |
| H & a Car Solutions Ltd | Transport & logistics | 2026 |
| H & B Safety Consultancy Limited | Administrative & support | 2011 |
| H & I Holdings Limited | Real estate | 2023 |
| H & J Enterprises Ltd | Hospitality | 2023 |
| H C Investments 2014 Ltd | Financial services | 2014 |
| H C Portugal LLP | | 2014 |
| H Dunne & Sons (Haulage) Limited | Transport & logistics | 2008 |
| H E Utilities Limited | Construction | 2024 |
| H Electrical Plumbing Limited | Construction | 2024 |
| H Elliott Electrical Ltd | Manufacturing | 2026 |
| H G Landscapes Woburn Limited | Administrative & support | 2016 |
| H H Wealth Limited | Administrative & support | 2013 |
| H J Vehicle Services Ltd | Wholesale & retail | 2022 |
| H N a Joinery Limited | Manufacturing | 2018 |
| H O Services Ltd | Administrative & support | 2015 |
| H R S (Luton) Limited | Wholesale & retail | 2003 |
| H Rose Import and Export Ltd | Wholesale & retail | 2025 |
| H&A Properties MK Ltd | Real estate | 2026 |
| H&B Buying Group LLP | | 2010 |
| H&B Commercial Projects Limited | Wholesale & retail | 2022 |
| H&B Development Group Ltd | Other services | 2014 |
| H&C Evaluate Limited | Professional & scientific | 2011 |
| H&D Properties Group Limited | Real estate | 2024 |
| H&G Finance Limited | Professional & scientific | 2018 |
| H&H Building and Maintenance Ltd | Construction | 2024 |
| H&J Decorating Limited | Construction | 2021 |
| H&J Design and Development Ltd | Construction | 2024 |
| H&S Enterprises MK Ltd | Wholesale & retail | 2019 |
| H&S Fine Foods Limited | Wholesale & retail | 2021 |
| H&S Wellbeing Group Ltd | Health & social care | 2024 |
| H&Scap Limited | Real estate | 2021 |
| H&W M.K. Limited | Real estate | 2019 |
| H&W M.K. Property Limited | Real estate | 2021 |
| H&Z MK Traders Ltd | Manufacturing | 2025 |
| H-Shamrock Finishing Ltd | Construction | 2021 |
| H. C Purdom Ltd | Other services | 2025 |
| H.A.Butler & SON Limited | Agriculture & fishing | 1960 |
| H.Bradford & Sons Limited | Administrative & support | 1938 |
| H.Denne Limited | Wholesale & retail | 2011 |
| H.G. Robinson & Sons Limited | Agriculture & fishing | 1982 |
| H.H Hospitality Food Service Limited | Hospitality | 2024 |
| H.M. Management Limited | Financial services | 1998 |
| H2 Matters Limited | Wholesale & retail | 2025 |
| H20 Management Ltd | Real estate | 2024 |