| Global Investment Alliance Limited | Financial services | 2019 |
| GLOBAL44 Limited | Administrative & support | 2025 |
| Globalora Limited | Hospitality | 2025 |
| Globe Renovations Ltd | Construction | 2019 |
| Glyn-Jones & Company Limited | Real estate | 2003 |
| GM Legal Recruitment Limited | Administrative & support | 2023 |
| Gnrc Limited | Health & social care | 2017 |
| Goda Road RTM Company Limited | Households | 2011 |
| Golbylocks Salon Collective Limited | Other services | 2026 |
| Gold Mark Home Improvements Ltd | Real estate | 2021 |
| Gold Mark Property Investors Ltd | Real estate | 2022 |
| Goldmark Craft Beers Ltd | Manufacturing | 2013 |
| Goldrush Media Ltd | Information & communication | 2015 |
| Gondals Motors Ltd | Wholesale & retail | 2025 |
| Gondals Property Limited | Real estate | 2023 |
| Gondals Sussex Ltd | Wholesale & retail | 2020 |
| Gonese Investment UK Limited | Real estate | 2022 |
| Good Faith Solutions Ltd | Professional & scientific | 2025 |
| GR8 Electrics Limited | Construction | 2024 |
| Grab & JOE Ltd. | Water & waste | 2016 |
| Graham Butt Estate Agents Limited | Real estate | 2007 |
| Graham Butt Lettings Limited | Other services | 2006 |
| Grain & Vein Ltd | Manufacturing | 2025 |
| Grand 22 Limited | Mining & quarrying | 2010 |
| Grand Central Investments Limited | Real estate | 2026 |
| Grand Mansions Limited | Households | 2007 |
| Grange END Residents Association Limited | Households | 1969 |
| Grannon Limited | Professional & scientific | 1953 |
| Grant Close (Management) Limited | Households | 1982 |
| Grant Nichols Music Limited | Arts & recreation | 2017 |
| Granville Road Property Management Limited | Extraterritorial | 2011 |
| Grassington Lodge Flat Management Company Ltd | Real estate | 2007 |
| Gravette Consultancy Services Limited | Professional & scientific | 2008 |
| Gravity Wave Games Ltd | Information & communication | 2024 |
| Gray Process Heaters Limited | Manufacturing | 1962 |
| Great Elegance Ltd | Wholesale & retail | 2023 |
| Greene Design Limited Liability Partnership | | 2007 |
| Greener Insights Ltd | Information & communication | 2023 |
| Greenfuture Technology Consulting Ltd | Information & communication | 2020 |
| Greenleaf JTL Limited | Construction | 2023 |
| Greenray Group Ltd | Administrative & support | 2025 |
| Greenshopuk Ltd | Wholesale & retail | 2025 |
| Greensmiths Limited | Agriculture & fishing | 2021 |
| Gresham House (Eastbourne) 2016 Limited | Households | 2016 |
| Gresham House (Eastbourne) Limited | Households | 2008 |
| Greshnfal Ltd | Financial services | 2021 |
| Gridline Engineering Limited | Construction | 2012 |
| Grief Work Limited | Health & social care | 2025 |
| Groombridge Management Company Limited | Households | 2021 |
| Group 44 Holdings Limited | Financial services | 2023 |
| Groutgleam Sussex Ltd | Administrative & support | 2023 |
| Growtrain Limited | Education | 2010 |
| Guardian Court (Worthing) RTM Company Limited | Households | 2026 |
| Gubbeans Ltd | Hospitality | 2026 |
| Gubbins Sussex. Ltd | Other services | 2024 |
| Gustolab Limited | Hospitality | 2016 |
| H&D Trade Ltd | Wholesale & retail | 2022 |
| H&L Enterprises Ltd | Professional & scientific | 2014 |
| H.F.C. Antunes Limited | Health & social care | 2016 |
| H.J.A Family Holding’S Limited | Wholesale & retail | 2025 |
| HAI Life Ltd | Professional & scientific | 2020 |
| Hair Advice Centre Limited | Other services | 2003 |
| Halford Jarvis & Co. Limited | Construction | 1978 |
| HAM Manor Golf Club Limited(The) | Arts & recreation | 1962 |
| Hambledon Place Management Company Limited | Households | 1989 |
| Hammond Close Residents Limited | Households | 2012 |
| Hampton Quay Holdings Ltd | Construction | 2019 |
| Haneefah Marie Enterprise Ltd | Health & social care | 2021 |
| Hang Developments Ltd | Real estate | 2025 |
| Happy Healthy Pets Ltd | Wholesale & retail | 2021 |
| Harbour Lights B (Eastbourne) Management Company Limited | Households | 1990 |
| Harbour View Accountancy Limited | Professional & scientific | 2025 |
| Harbour View Accounting Ltd | Professional & scientific | 2025 |
| Harbourside East Management Limited | Households | 2002 |
| Harcon Limited | Real estate | 1967 |
| Hargreaves Construction Company Limited | Construction | 2010 |
| Hargreaves Developments Limited | Real estate | 1971 |
| Hargreaves Estates Limited | Real estate | 1974 |
| Hargreaves Group Holdings Limited | Financial services | 1999 |
| Hargreaves Homes Limited | Extraterritorial | 2010 |
| Hargreaves Investment Properties Limited | Professional & scientific | 1990 |
| Hargreaves Management Limited | Real estate | 1973 |
| Hargreaves Properties Limited | Construction | 1964 |
| Hargreaves Property Holdings Limited | Financial services | 1967 |
| Hargreaves Property Investments Limited | Real estate | 1986 |
| Hargreaves Residential Developments Ltd | Construction | 2001 |
| Hargreaves Securities Limited | Financial services | 1994 |
| Hargreaves Trustee Company Limited | Other services | 1999 |
| Harlington Management Company Limited | Households | 1989 |
| Harriet Wright Designs Ltd | Manufacturing | 2016 |
| Harriott Cohen Productions Ltd | Information & communication | 2018 |
| Harris Foods Ltd | Hospitality | 2025 |
| Harris Jacobs Ltd | Real estate | 2021 |
| Harwood Contract Services Limited | Construction | 2026 |
| Harwood Fire Solutions Limited | Public administration | 2021 |
| Haute Chalets Limited | Administrative & support | 2015 |
| Hawthorn Gardens Management Co. Limited | Households | 1969 |
| Hazel Tree Research Ltd | Professional & scientific | 2022 |
| Hazeldine Consultants Limited | Professional & scientific | 2016 |
| Hblw Ltd | Wholesale & retail | 2025 |