| Galloper Limited | Administrative & support | 2020 |
| Gary Cohen Agencies Limited | Wholesale & retail | 2009 |
| GAS Cert Plumbing Ltd | Construction | 2021 |
| GB GAS Ltd | Other services | 2008 |
| GBD Stem Ltd | Education | 2023 |
| Gencardz Limited | Wholesale & retail | 2026 |
| Geronimo 777 Ltd | Health & social care | 2018 |
| Getxo Ltd | Hospitality | 2019 |
| GH Services and Maintenance Limited | Professional & scientific | 2023 |
| Ghostline Limited | Information & communication | 2022 |
| Gilesconsult Limited | Professional & scientific | 2008 |
| Global Big Corp Ltd | Professional & scientific | 2025 |
| Global Bike Adventures Ltd | Arts & recreation | 2014 |
| Global Parts & Services Ltd | Professional & scientific | 2008 |
| Global Response Limited | Administrative & support | 2006 |
| GMW Logistics Ltd | Transport & logistics | 2022 |
| Go ! English Language Courses Limited | Education | 2007 |
| Gochers Laundry Limited | Other services | 1932 |
| Godspeed Couriers Ltd | Transport & logistics | 2015 |
| Golden ERA Limited | Wholesale & retail | 2024 |
| Golden Sun Ltd | Hospitality | 2013 |
| Good Looking Design Limited | Professional & scientific | 2018 |
| GP Services International Limited | Health & social care | 2020 |
| Gps-Services Limited | Construction | 2013 |
| GR8 Sunglasses Ltd | Wholesale & retail | 2023 |
| GR8 Watches Ltd | Wholesale & retail | 2020 |
| Grand Court Mansions (Hove) Limited | Households | 1959 |
| Grandhome Residents Association Limited | Households | 1988 |
| Grant GEE Film Ltd | Information & communication | 2015 |
| GRD Decorators Limited | Construction | 2022 |
| Great 2 Create Ltd | Wholesale & retail | 2019 |
| Greatmates Limited | Information & communication | 2016 |
| Green Place Investments Limited | Real estate | 2001 |
| Green Spire Studios Limited | Extraterritorial | 2006 |
| Greenways Property Services Ltd | Real estate | 2023 |
| Griffiths-Nelson Limited | Health & social care | 2011 |
| GRN Transport Limited | Transport & logistics | 2019 |
| Groovemusic Ltd | Information & communication | 2025 |
| Grosvenor Court (Brighton) Tenants Association Limited | Households | 1955 |
| Grosvenor Menghini Financial Ltd | Administrative & support | 2002 |
| Group Home Properties Ltd | Real estate | 2026 |
| Group Recoveries Limited | Real estate | 1997 |
| Grove Gardens Limited | Administrative & support | 2005 |
| Growing Giants Ltd | Health & social care | 2024 |
| Gruber's Spirits Ltd. | Manufacturing | 2021 |
| Guineasnake Ltd | Information & communication | 2025 |
| GWP Driving Services Ltd | Transport & logistics | 2009 |
| Gwydyr Mansions Limited | Households | 1993 |
| Gypcom Limited | Construction | 2001 |
| Gypcom Management Limited | Financial services | 2013 |
| Gypcom Property Limited | Construction | 2013 |
| Gypcom Specialist Rendering Limited | Construction | 2023 |
| Gyso Leisure Ltd | Arts & recreation | 2014 |
| Hair by Scott Palmer Ltd | Other services | 2022 |
| HAM Road Limited | Real estate | 2005 |
| Hammer Screen Printing Ltd | Manufacturing | 2003 |
| Hammonds Ridge (Burgess Hill) Management Company Limited | Households | 2010 |
| Hangleton Rangers Youth Football Club CIC | Arts & recreation | 2026 |
| Hannah Tyson & Company Ltd | Professional & scientific | 2011 |
| Happy Elephant Property Services Ltd | Real estate | 2024 |
| Happy Idiot Productions Ltd | Information & communication | 2017 |
| Happy to Help Sussex Ltd | Health & social care | 2026 |
| Happyhq Ltd | Professional & scientific | 2018 |
| Harbour House (Shoreham) Management Limited | Extraterritorial | 1999 |
| Haretech Ltd | Information & communication | 2025 |
| Harkz Limited | Professional & scientific | 2026 |
| Harland Property Group Limited | Real estate | 2019 |
| Harmans' and Hounds Ltd | Other services | 2025 |
| Harmony Vineyard Ltd. | Agriculture & fishing | 2016 |
| Harvard Flight Centres Limited | Transport & logistics | 2014 |
| Havoc OP International Films Limited | Information & communication | 2012 |
| Hawk Telecom Limited | Professional & scientific | 2006 |
| Hawkridge Labs Ltd | Manufacturing | 2019 |
| Hayler Property Ltd | Construction | 2025 |
| HB Accountancy(Brighton) Limited | Professional & scientific | 2018 |
| HE Woodman Ltd | Professional & scientific | 2000 |
| Healthcare Revolution Homecare Ltd | Health & social care | 2025 |
| Heatherlea House Management Limited | Households | 1988 |
| Hello Management Consulting Limited | Professional & scientific | 2026 |
| Henry Dennis (Properties) Limited | Construction | 1973 |
| Henry HQ Limited | Professional & scientific | 2025 |
| Here BE Treasure Limited | Professional & scientific | 2016 |
| Hereford RTM Company Limited | Households | 2025 |
| Heritage Parts Centre Limited | Wholesale & retail | 2024 |
| Hexica Limited | Information & communication | 2004 |
| HEY Pablo Ltd | Information & communication | 2026 |
| HG Legal Consulting Ltd | Professional & scientific | 2019 |
| HGR Group Ltd | Wholesale & retail | 2023 |
| Hiber Storage UK Ltd | Transport & logistics | 2026 |
| Hideaway Brighton Ltd | Other services | 2025 |
| Highrise Scaffold Team Ltd | Construction | 2026 |
| Hillary Norgay Property Capital Ltd | Real estate | 2020 |
| HIT Training Ltd | Education | 2025 |
| HMB & PMT Limited | Hospitality | 2018 |
| HMB & SMB Limited | Hospitality | 2017 |
| Hodgson South Property Ltd | Real estate | 2018 |
| Hollingbury Joinery Ltd | Manufacturing | 2015 |
| Holmbush Motors Limited | Wholesale & retail | 2015 |
| Holo Vault Ltd | Wholesale & retail | 2026 |
| Home Appliance Direct Ltd | Wholesale & retail | 2018 |