| Hove Bathroom Centre Limited | Wholesale & retail | 1998 |
| Hove Chiropractic Clinic Limited | Health & social care | 2002 |
| Hove Limited | Extraterritorial | 2006 |
| Howard Bros Joinery Ltd. | Manufacturing | 1996 |
| Howard Ward Enterprises Limited | Professional & scientific | 1986 |
| Howards Antique Jewellery Limited | Wholesale & retail | 2003 |
| Howards Pavilian Restaurant Limited | Hospitality | 1936 |
| Howsonhughes Limited | Professional & scientific | 2007 |
| Hubub Media LLP | | 2006 |
| Hugh Page (Litho) Limited | | 1984 |
| Humaira Ltd | Wholesale & retail | 2011 |
| Hunter Financial Management Limited | Financial services | 1997 |
| Hurdlevale Properties Limited | | 1983 |
| Hurryactual Projects Limited | Extraterritorial | 1993 |
| Hurst Electrical Limited | Construction | 1991 |
| Hurston Properties Limited | Construction | 1993 |
| Hydrotech Water Solutions Limited | Manufacturing | 2024 |
| I P Glenister Limited | Construction | 2002 |
| IAN Lock Associates Limited | Professional & scientific | 2007 |
| ICC Editing Limited | Information & communication | 2024 |
| Icklesham Joinery Limited | Manufacturing | 1978 |
| ICS Builders Limited | Construction | 2002 |
| Identity Events Management Limited | Administrative & support | 2001 |
| Identity Global Limited | Financial services | 2021 |
| Ifina (UK) Limited | Financial services | 2001 |
| IMP Training & Development Ltd | Professional & scientific | 2002 |
| Increase Success Limited | Professional & scientific | 2006 |
| Independent Mortgage Matters Ltd | Financial services | 2002 |
| Inet Telecoms Ltd | Information & communication | 2004 |
| Infotrak Limited | Professional & scientific | 1982 |
| Infrastructure Software Solutions Limited | Information & communication | 2022 |
| Insurance Linx Limited | Financial services | 2007 |
| Integrated Consultancy Service (ICS) Ukeig | Professional & scientific | 1997 |
| Integrated Technical Services Limited | Construction | 2007 |
| Intelligent Packaging Limited | Manufacturing | 2005 |
| Interim HR Solutions Limited | Administrative & support | 2004 |
| Interimprint Limited | | 1983 |
| International Dance Publications Limited | Information & communication | 1997 |
| International Theatre & Music Limited | Arts & recreation | 1991 |
| International Toiletries & Cosmetics Limited | Manufacturing | 1998 |
| Into Global Education Limited | Other services | 1997 |
| Ironridge Crafts Limited | Construction | 1997 |
| Irvings Property Investment Ltd | Health & social care | 2006 |
| IS D-Sign Limited | Information & communication | 2003 |
| Isfahan Carpet Palace Limited | Wholesale & retail | 1983 |
| ISH Roberts Ltd | Transport & logistics | 2017 |
| Itema Limited | Professional & scientific | 1998 |
| IWA Consulting Engineers Ltd | Professional & scientific | 1984 |
| Ixia UK Limited | Manufacturing | 2000 |
| J & D Swan Holdings Ltd | Real estate | 1905 |
| J & P Brickwork Limited | Extraterritorial | 2007 |
| J C Refrigeration Limited | Construction | 2007 |
| J Fountain & Sons Limited | Wholesale & retail | 1957 |
| J H Payne (Electrical) Limited | Professional & scientific | 2000 |
| J K M Developments Limited | Construction | 2004 |
| J Marshall Limited | Real estate | 2007 |
| J W Plumbing & Heating Limited | Construction | 1997 |
| J. Mccarthy & Sons (Sussex) Ltd | | 1991 |
| J.A. Strafford Limited | Administrative & support | 1992 |
| J.B.Sullivan Limited | Hospitality | 1962 |
| J.M. Trading Co. Limited | Administrative & support | 1993 |
| J2S Solutions Limited | Extraterritorial | 2002 |
| Jack and Jill Windmills Society | Arts & recreation | 2006 |
| Jack Smith Estate Agents Ltd | Real estate | 2018 |
| Jackson Lewis Associates Limited | Construction | 2003 |
| Jackson's Property Developments Limited | Real estate | 2002 |
| James & Lainchbury (Holdings) Limited | Real estate | 1982 |
| Janet Bray Ltd | Health & social care | 1999 |
| Javea (UK) Limited | Real estate | 1999 |
| Jaykirk Limited | Professional & scientific | 1991 |
| JED Powell Landscape & Tree Surgery Contractors Limited | Administrative & support | 2002 |
| Jennymark Limited | Administrative & support | 1996 |
| Jenste Limited | Manufacturing | 2005 |
| Jeremy's Restaurants Limited | Hospitality | 1991 |
| Jerkin Crocus Promotions Limited | Arts & recreation | 1999 |
| Jetrade Limited | Wholesale & retail | 1997 |
| JIM Miller Design Limited | Professional & scientific | 2003 |
| JIM Philps Limited | Construction | 2003 |
| JIM Soan & Sons Limited | Construction | 2002 |
| Jimboe Limited | Real estate | 1982 |
| Jjkl Limited | Transport & logistics | 2007 |
| JKC Management Limited | Construction | 1994 |
| Joergensen Limited | Professional & scientific | 1998 |
| John Adams Fine Art Limited | Wholesale & retail | 1992 |
| John Duffield Limited | Construction | 2002 |
| John F Whippy & Company Limited | Financial services | 2002 |
| John Farrington & Co Limited | Construction | 1992 |
| John Mills Construction Ltd | Construction | 2015 |
| John Smith House Limited | Real estate | 2021 |
| John Thorpe Consultancy Limited | Professional & scientific | 2012 |
| John Wiles Associates | | 1998 |
| Johnsons Roofing Ltd | Construction | 2000 |
| Joint Action Group - Newhaven/Dieppe Ukeig | Information & communication | 1993 |
| Jordan Productions Limited | Arts & recreation | 1993 |
| Jouststone Management Company Limited | Households | 1988 |
| Jovo Limited | Hospitality | 2007 |
| JP Invest Ltd | Financial services | 2024 |
| JPB Fencing Limited | Administrative & support | 2006 |
| JRG Chinnor 2 Ltd | Real estate | 2024 |
| JT Access Limited | Agriculture & fishing | 2020 |