| Julian Godfrey Engineering Ltd | Wholesale & retail | 2006 |
| Julian Godfrey Motorsport LLP | | 2007 |
| Julian Stephens Limited | Manufacturing | 2003 |
| Julie Underdown Limited | Professional & scientific | 2008 |
| Juliet Oxborrow Communications Limited | Professional & scientific | 2005 |
| Juliet's Catering Ltd | Hospitality | 2002 |
| Junior Petunia Limited | Wholesale & retail | 2003 |
| Juniper Brand Development Limited | Extraterritorial | 2001 |
| Just Cool Ltd | Professional & scientific | 2005 |
| Just Developments Limited | Other services | 1986 |
| Just Golf Clubs Limited | Wholesale & retail | 2002 |
| K D Catering Butchers Ltd | Manufacturing | 2006 |
| K H Precision Engineering Limited | Manufacturing | 2007 |
| K Waller Electrical Contractors Limited | Construction | 2002 |
| K'S Business & Secretarial Services | | 1992 |
| K.C. Office Services Limited | Administrative & support | 1991 |
| K.R. Shaw Securities Limited | Professional & scientific | 1991 |
| K.T. Assemblies Limited | Manufacturing | 1995 |
| Kalimex Limited | Wholesale & retail | 1998 |
| Kanga Kids Limited | Wholesale & retail | 1999 |
| Kasa Investments Limited | Real estate | 2007 |
| Kate Riley Limited | Other services | 2003 |
| Keep IT Clean Ltd | Administrative & support | 2008 |
| Keith Hunt Scaffolding Ltd | Construction | 2006 |
| Keith Spencer & Co. Ltd | Construction | 1990 |
| Kemp Bros Limited | Wholesale & retail | 2003 |
| Kennedy Exports Limited | Real estate | 1987 |
| Kennedy Hygiene Products Ltd | Manufacturing | 1978 |
| Kensett Holdings Limited | Financial services | 1957 |
| Kensett Limited | Manufacturing | 1983 |
| Keshet Computing Limited | Information & communication | 1996 |
| Kestrel Project Management Limited | Professional & scientific | 2003 |
| Kevsan Properties Limited | Real estate | 1981 |
| Keyprize Limited | Real estate | 1998 |
| Keystone Micro Technology | | 1991 |
| KG General Partner Ltd | Other services | 2006 |
| Kibblewhite Gardens Limited | Administrative & support | 2005 |
| Kicc Products Limited | Extraterritorial | 2015 |
| Kiernan & Company (U.K.) Limited | Professional & scientific | 1965 |
| Kilsaran Limited | Real estate | 2003 |
| Kindered Properties Limited | Construction | 2000 |
| King Bros.And Potts,Limited | Wholesale & retail | 1913 |
| Kingpin Investments Limited | Financial services | 1961 |
| Kings Centre (Eastbourne) Limited | Hospitality | 2004 |
| Kings Roofing & Brickwork Limited | | 1982 |
| Kingshott Haulage Limited | Transport & logistics | 2004 |
| Kingsview Optical Limited | Manufacturing | 1993 |
| Kirkham Court (Eastbourne) Limited | Households | 1999 |
| Kirkville Estates Limited | Households | 1988 |
| Kismet Leisure Limited | | 1962 |
| Kismet Property Investment Limited | Real estate | 2004 |
| Klean Industries (UK) Limited | Wholesale & retail | 2005 |
| Knock Bay Hardwoods Limited | Wholesale & retail | 2000 |
| Knowle House (Hove) Limited | Households | 2002 |
| Komedia Limited | Arts & recreation | 1998 |
| Komedia Productions | Arts & recreation | 1994 |
| Krishna Software Solutions Limited | Information & communication | 2011 |
| Krunchkins Limited | Wholesale & retail | 1984 |
| L & M Trading Enterprises Limited | Real estate | 2003 |
| L B International Limited | Wholesale & retail | 1989 |
| L Dash Limited | Construction | 2007 |
| Lacebond Consultants Limited | Professional & scientific | 1992 |
| Ladtract Ltd | Construction | 2020 |
| Laitwood Technology Limited | Information & communication | 2002 |
| Lake Escomb Limited | Agriculture & fishing | 2007 |
| Lakehomes Limited | Professional & scientific | 2000 |
| Lambent Productions Ltd | Information & communication | 1995 |
| Langpine Properties Limited | Households | 1986 |
| Languard Alarm Company Limited(The) | Other services | 1984 |
| Lansdowne Reproductions | | 1991 |
| Larona Financial Management Limited | Professional & scientific | 2006 |
| Larraby Land Limited | Construction | 1989 |
| Larraby LLP | | 2007 |
| Latimeria Consulting Ltd | Administrative & support | 2007 |
| Laton House Limited | Households | 2006 |
| Laton Technical & Consultancy Services Limited | Information & communication | 1978 |
| Laura Westcott Enterprises Limited | Professional & scientific | 2017 |
| Lawson & Sons Estate Agents Limited | Real estate | 2021 |
| Lawtrade Limited | Professional & scientific | 1999 |
| Lazzari Design Ltd | Administrative & support | 1998 |
| LBJ : Art Ltd | Professional & scientific | 2006 |
| Leaderboard Golf Holdings Limited | Administrative & support | 2011 |
| Leander Swimming Club Ltd | Arts & recreation | 2014 |
| Leaper Stanbrook Ltd | Real estate | 2007 |
| Ledj Distributors Limited | Manufacturing | 2002 |
| LEE Barnes Ltd | Manufacturing | 2002 |
| Legacy Change Management Consulting Limited | Arts & recreation | 2002 |
| Leisure Entertainment Limited | Arts & recreation | 2002 |
| Leisure Harbours Limited | Professional & scientific | 1984 |
| Lepark Assets PLC | | 1990 |
| LES Ambassadeurs Limited | | 1979 |
| Levett and Martin Limited | Wholesale & retail | 1971 |
| Lewes Live Literature | Arts & recreation | 1998 |
| Lewes Riverside Limited | Professional & scientific | 2007 |
| Lewis Hinkley & Co Limited | Professional & scientific | 2002 |
| Leyland-Dent Limited | Health & social care | 2007 |
| LHS and Sons Resurfacing Limited | | 2007 |
| Liam Wales Illustration Ltd | Arts & recreation | 2015 |
| Liberty Autoworks Ltd | Wholesale & retail | 2006 |
| Light Relief | Other services | 2002 |