| Green Lizard Marketing Communications Limited | Real estate | 2001 |
| Green Residents Management Company Limited(The) | Households | 1986 |
| Green Ways Countryside Management Limited | Administrative & support | 2004 |
| Greenapple Homes Ltd | Real estate | 1998 |
| Greetings Cakes Limited | Manufacturing | 1990 |
| Grenadier Management Limited | Households | 1994 |
| Gridarea Limited | Wholesale & retail | 1992 |
| Grove Leisure Associates Limited | Professional & scientific | 2005 |
| GS Audio Limited | Information & communication | 2005 |
| GTA Surveyors & Engineers Ltd | Professional & scientific | 2021 |
| Guiderich Limited | Manufacturing | 1986 |
| Guildbourne Meats Ltd | Wholesale & retail | 2005 |
| Gunter Ltd | Professional & scientific | 2023 |
| Gustavo Talon Limited | Professional & scientific | 2023 |
| H & H Produce Limited | Wholesale & retail | 2003 |
| H.Hicks & SON Limited | Real estate | 1949 |
| Haider Broking LLP | | 2008 |
| Haider House Limited | Financial services | 2006 |
| Hailsham Pavilion Limited | Arts & recreation | 1996 |
| Haines & Dell Limited | | 1985 |
| Hair & Skin Cosmetic Clinic Limited | Health & social care | 2006 |
| HAL Bertram Limited | Information & communication | 2003 |
| Hamilton Entertainment Ltd | Real estate | 2007 |
| Hamilyde Limited | Households | 1986 |
| Hammonds Drive MOT Centre Ltd | Wholesale & retail | 2005 |
| Handley Systems (Worthing) Limited | Professional & scientific | 2004 |
| Hanover Care Limited | Administrative & support | 2000 |
| Harkia Limited | Construction | 1958 |
| Harris R Homes Limited | Construction | 2006 |
| Hart Reade Properties Ltd | Professional & scientific | 2001 |
| Harwin Shipping Agency Limited | Administrative & support | 1924 |
| Hasting Curry House Limited | Hospitality | 2022 |
| Hastings Centre Trading Limited | Hospitality | 2004 |
| Hastings Fishmarket Enterprises Limited | Agriculture & fishing | 1989 |
| Hastings Hire Centre Limited | Administrative & support | 1992 |
| Hastings Legal Limited | Professional & scientific | 1995 |
| Hastings Property Company LLP | | 2007 |
| Hastings Property Management Services | | 1987 |
| Hastings Transmissions | | 1987 |
| Hatton Haulage Limited | Transport & logistics | 2000 |
| Haven Rest Homes Limited | Extraterritorial | 1981 |
| Haven Security Ltd | Administrative & support | 2003 |
| Havenmere Investments Limited | Real estate | 1997 |
| Havenscroft Limited | Construction | 1993 |
| Hawker Glass Limited | | 1986 |
| Hawkins Mechanical Services Ltd | Construction | 2003 |
| Hayland Developments Limited | Real estate | 1956 |
| Hazcon Safety Services Limited | Professional & scientific | 1989 |
| Heal Your Heart Ltd | Other services | 2023 |
| Healy Taxis Limited | Transport & logistics | 2003 |
| Healys Property Limited | Professional & scientific | 2003 |
| Heasman Builders Limited | Construction | 1975 |
| Heatherdune Management Limited | Households | 2004 |
| Heatline Services Limited | Construction | 2001 |
| Heavy Equipment Maintenance Solutions (Hems) Limited | Wholesale & retail | 2004 |
| Hedley Visick Limited | Construction | 1959 |
| Helical Former Ltd | Manufacturing | 2020 |
| Helpmechef Limited | Information & communication | 2001 |
| Henley Down Farm Limited | Agriculture & fishing | 1960 |
| Henley House Veterinary Clinic Limited | Professional & scientific | 2006 |
| Henry Woods Waste Management Limited | Water & waste | 2004 |
| Herby LB Limited | Construction | 2001 |
| Hermes Grundstuecksbesitzgesellschaft Ltd | Administrative & support | 2006 |
| Heron Construction and Development Limited | Construction | 1984 |
| Heston Services Limited | Real estate | 1999 |
| Hi-Lux Building Company Limited | | 1988 |
| Hi-Po Plants Limited | Administrative & support | 1985 |
| High Street Income Ltd | Real estate | 2021 |
| High Street NO 79 Limited | Administrative & support | 2005 |
| High Weald Furniture Ltd | Manufacturing | 2000 |
| Highcroft Villas (Freehold) Limited | Households | 2003 |
| Highgrove (Battle) Limited | Real estate | 1997 |
| Highland Scaffold Hire Limited | Construction | 1996 |
| Hightree Medical Limited | Health & social care | 2007 |
| Highway Equipment and Building Limited | Administrative & support | 2004 |
| Hill Bros. Limited | Construction | 1993 |
| Hill House Properties Ltd. | Real estate | 1995 |
| Hillcrest Maintenance Company (Newhaven) Limited | Administrative & support | 1986 |
| Hills (Hastings) Limited | Real estate | 1996 |
| HKS Interiors Limited | Wholesale & retail | 2001 |
| Hogarth Business Services Limited | Professional & scientific | 1997 |
| HOI SUM Limited | Hospitality | 2003 |
| Holbeck & Lewis (Developments) Limited | Construction | 1999 |
| Holdfollow Limited | | 1986 |
| Holland Harper LLP | | 2006 |
| Holmgate Limited | Households | 1965 |
| Holtbond Limited | Real estate | 1991 |
| Homecare Exteriors Limited | Construction | 2001 |
| Homelands Residents Co. Limited | Households | 1989 |
| Honey Barrett Limited | Professional & scientific | 2007 |
| Hong Kong House Ltd | Hospitality | 2023 |
| Hookcastle Limited | Real estate | 1974 |
| Hoole Estate Agents Limited | Real estate | 2006 |
| HOP Farm Real Estate Limited | Administrative & support | 2004 |
| Hoque & H Ltd | Hospitality | 2020 |
| Horder Healthcare | Health & social care | 1995 |
| Horsham Reprographics Limited | Professional & scientific | 1990 |
| Hot Under the Collar Productions Limited | Arts & recreation | 1993 |
| House Project Centre | Administrative & support | 2002 |
| Hova Court Limited | Households | 1998 |