| Group 1 Estates Limited | Construction | 1934 |
| Group 1 Retail Limited | Wholesale & retail | 1923 |
| Group 1 Trade Parts Limited | Wholesale & retail | 2005 |
| Group JDB Limited | Professional & scientific | 2025 |
| Group Twenty One Ltd | Financial services | 2025 |
| Grover-Decoration Ltd | Construction | 2019 |
| Growfair Ltd | Administrative & support | 2020 |
| Growing Golf Limited | Arts & recreation | 2017 |
| GRR2020 Limited | Transport & logistics | 2022 |
| GRS Arboricultural Consultant Limited | Professional & scientific | 2022 |
| GS Auto Detailing Limited | Wholesale & retail | 2025 |
| GS Handyman Ltd | Construction | 2014 |
| GS4 Services Ltd | Construction | 2020 |
| GSB Logistics Ltd | Transport & logistics | 2020 |
| GSD Mechanical Ltd | Professional & scientific | 2026 |
| GSI Homes Ltd | Real estate | 2025 |
| GSM Elevators Ltd | Construction | 2007 |
| Gstm Ltd | Administrative & support | 2019 |
| GSV Trans Ltd | Transport & logistics | 2018 |
| GT Aerospace (Europe) Limited | Administrative & support | 2009 |
| GT Auto Works Ltd | Wholesale & retail | 2026 |
| GT Construction Style Ltd | Construction | 2024 |
| GT Film Group Limited | Financial services | 2026 |
| GT Film Hire Limited | Administrative & support | 2024 |
| GT Film Holdings Limited | Financial services | 2024 |
| GT Film Power Limited | Extraterritorial | 2025 |
| GT Film Toilets Limited | Other services | 2024 |
| GT Film Transport Ltd | Transport & logistics | 2021 |
| GT Film Waste Limited | Water & waste | 2024 |
| GT Fuel Limited | Wholesale & retail | 2024 |
| GT Jointing Limited | Manufacturing | 2011 |
| GT Legends Ltd | Wholesale & retail | 2013 |
| GT Truck Ltd | Transport & logistics | 2025 |
| Gt-Bio Consulting Ltd | Professional & scientific | 2025 |
| GTB Transport Ltd | Transport & logistics | 2015 |
| GTC Tools Limited | Wholesale & retail | 2014 |
| GTI Renovation Ltd | Construction | 2026 |
| GTM Contracts Ltd | Construction | 1988 |
| GTP Accountancy Limited | Professional & scientific | 2021 |
| GTP Accounting Limited | Professional & scientific | 2018 |
| GTS (Europe) Limited | Wholesale & retail | 2000 |
| GTS Holdings Worldwide Limited | Financial services | 2018 |
| Gtshine Ltd | Professional & scientific | 2024 |
| GTT 40 Limited | Real estate | 2004 |
| GTT 41 Limited | Professional & scientific | 2005 |
| GU10 Holdings Ltd | Financial services | 2026 |
| Guardian and Angels Limited | Other services | 2007 |
| Guardian Doors Systems Ltd | Construction | 2026 |
| Guest Medical Limited | Wholesale & retail | 1987 |
| Guidebrook Limited | Wholesale & retail | 2005 |
| Gullands LLP | | 2020 |
| Gunev Transport Ltd | Transport & logistics | 2018 |
| Gurkha Properties Ltd | Real estate | 2022 |
| Gurung Logistics Ltd | Transport & logistics | 2018 |
| Gurung PNP Limited | Transport & logistics | 2019 |
| Guto's Services Ltd | Transport & logistics | 2025 |
| GUY Charbaut (UK) Limited | Wholesale & retail | 2019 |
| Guys GAS Plumbing and Heating Ltd | Construction | 2019 |
| GV Electrical Ltd | Construction | 2017 |
| GV Maidstone Limited | Hospitality | 2025 |
| GVE Commercial Solutions (Building) Ltd | Professional & scientific | 2021 |
| GVE Commercial Solutions Limited | Professional & scientific | 2011 |
| GVM Gents Ltd | Wholesale & retail | 2020 |
| GVM Property Ltd | Real estate | 2025 |
| Gvsa Ltd | Hospitality | 2019 |
| GVT Solutions Ltd | Information & communication | 2018 |
| GW Highways Ltd | Construction | 2020 |
| Gwam Homes Limited | Construction | 2024 |
| Gwemy Care Solution Limited | Health & social care | 2024 |
| GWT Media Limited | Information & communication | 2006 |
| GYA Transport Limited | Transport & logistics | 2023 |
| Gyllyng House Limited | Real estate | 1978 |
| Gymfit Holdings Ltd | Wholesale & retail | 2023 |
| Gymops Ltd | Wholesale & retail | 2023 |
| Gyn-D Ltd | Health & social care | 2019 |
| Gynae Consultants Limited | Health & social care | 2014 |
| H & a Bespoke Metalwork Limited | Manufacturing | 2022 |
| H & C Motors Limited | Wholesale & retail | 2006 |
| H & D Financial Planning Limited | Financial services | 2017 |
| H & D Wealth Limited | Financial services | 1987 |
| H & F Sports Ltd | Wholesale & retail | 2014 |
| H & W General Engineering Limited | Administrative & support | 2002 |
| H S Restoration Limited | Construction | 2004 |
| H Young(Plastics)Limited | Professional & scientific | 1947 |
| H&B Construction Services Ltd | Construction | 2019 |
| H&E Solutions Ltd | Information & communication | 2022 |
| H&H Cabling & Fibre Limited | Construction | 2026 |
| H&P Eventing Limited | Agriculture & fishing | 1980 |
| H.G.Tompsett & Sons Limited | Agriculture & fishing | 1957 |
| H.S Electric Services Ltd | Construction | 2025 |
| H1 Project Support Services Limited | Administrative & support | 2025 |
| H2 Pharma Consulting Limited | Administrative & support | 2007 |
| H2C IP Limited | Professional & scientific | 2020 |
| H2C Limited | Administrative & support | 2018 |
| H2GOGO Industries Limited | Manufacturing | 2012 |
| H3 Electrical Installations (Kent) Limited | Construction | 2021 |
| H3 Electrical Installations Limited | Construction | 2015 |
| H4B London Limited | Professional & scientific | 1995 |
| H4T Limited | Administrative & support | 2007 |
| HAA Medicals Limited | Health & social care | 2014 |