| Trade Counters Direct Limited | Wholesale & retail | 2002 |
| Tradebrook Services Limited | Professional & scientific | 2000 |
| Trading 4 U Holdings Limited | Professional & scientific | 2004 |
| Trafeco Systems Limited | Real estate | 1998 |
| Transcriptionsdirect Limited | Information & communication | 2004 |
| Transfersnews Limited | Information & communication | 2020 |
| Transformaction Limited | Professional & scientific | 2003 |
| Transnet Contracts Limited | Other services | 1996 |
| TRC Realty Limited | Administrative & support | 2004 |
| Treework & Forestry Ltd | Agriculture & fishing | 2003 |
| Trial-Link Limited | Real estate | 1995 |
| Tribeca (Brighton) Ltd. | Wholesale & retail | 2002 |
| Tribune IS Limited | Information & communication | 2004 |
| Trinile Limited | | 1987 |
| Trinity Homes (UK) Limited | Construction | 2001 |
| Triple M Creative Ltd | Wholesale & retail | 2003 |
| Trojan Rose Limited | Construction | 1992 |
| Trossell Osborn Property Services | | 1995 |
| TSS Southern Limited | Construction | 2004 |
| Turner Print Systems Limited | Wholesale & retail | 2007 |
| Turningwaves Limited | Real estate | 2001 |
| Twin Arts Limited | Education | 2003 |
| Tyrannus Ltd | Information & communication | 2003 |
| Tyre & Battery Services (Sussex) Limited | Wholesale & retail | 1968 |
| Tyrell Aviation Services Limited | Information & communication | 1996 |
| U and W International Trading Company Ltd | Wholesale & retail | 2003 |
| Uckfield Chiropractic Clinic Limited | Health & social care | 2006 |
| UHY Cloudbooks Ltd | Professional & scientific | 1979 |
| UK Care Skills Academy Limited | Education | 2022 |
| UK Umbrella Service Limited | Administrative & support | 2005 |
| Ultra Analog Limited | Extraterritorial | 2015 |
| Unigel (UK) Limited | Manufacturing | 1995 |
| Unipower (UK) Limited | Other services | 1996 |
| United Business Ltd | Wholesale & retail | 2004 |
| Unithai Oriental Market Limited | Wholesale & retail | 2005 |
| Upfields Plumbing & Heating Contractors Limited | Construction | 1991 |
| Upham Residents Association Limited | Households | 1969 |
| Upperton One Realisations Limited | | 1982 |
| V.A.S. Maddison Limited | Construction | 1972 |
| V.R.Flowers & SON Limited | Wholesale & retail | 1970 |
| Valco Cincinnati Limited | Manufacturing | 1988 |
| Varg Consultancy Ltd | Wholesale & retail | 2003 |
| Variton Limited | Administrative & support | 2007 |
| Vector Resourcing Ltd | Information & communication | 1997 |
| VENUE99 Ltd | Administrative & support | 2019 |
| Vernon Terrace Property Limited | Real estate | 2001 |
| Vernon Terrace Residents Association Limited | Households | 1992 |
| Versyns Ventures Limited | Agriculture & fishing | 1998 |
| Vesli.Com Ltd | Agriculture & fishing | 2005 |
| VIC Hillgrove Limited | Real estate | 2005 |
| Vic's Transport Limited | Transport & logistics | 2022 |
| Viccari Wheele Limited | Administrative & support | 1998 |
| Victoria House (the Upper Drive) Residents Association Limited | Households | 1998 |
| Viewblock Property Management Limited | Real estate | 1988 |
| Villa Match Limited | Professional & scientific | 1982 |
| Village Green Recycling Limited | Water & waste | 2008 |
| Village Taxation Services Ltd | Professional & scientific | 2004 |
| Vince Wear Ltd | Wholesale & retail | 2026 |
| Visick Cars Limited | Wholesale & retail | 1978 |
| Vision Martial Arts & Fitness Centre Limited | Arts & recreation | 2003 |
| Visualise Limited | Professional & scientific | 2017 |
| Viva Hair Design Limited | Other services | 2001 |
| Vkhp Consulting Limited | Administrative & support | 2007 |
| W E Clark & SON Limited | Wholesale & retail | 2008 |
| W. H. Walker & Brothers Limited | Information & communication | 1989 |
| W. Stapleton Electrical Limited | Construction | 1996 |
| W.J. Martin Building Contractors Limited | Construction | 1999 |
| Wainford Holdings Limited | Financial services | 1996 |
| Walbrokers Limited | Wholesale & retail | 1996 |
| Waller & Bluck Broking LLP | | 2008 |
| Walton Park Properties Limited | Real estate | 2002 |
| Wards Group Limited | Wholesale & retail | 2005 |
| Warminster Court Management Company Limited | Households | 1984 |
| Warners Technical Services Limited | Professional & scientific | 1921 |
| Warrior Square Residents Association Limited | Households | 1985 |
| Warwick Trustees Limited | Real estate | 2007 |
| Wasp Property Limited | Real estate | 2002 |
| Watchman Alarms Limited | | 1993 |
| Watchpact Limited | Construction | 1994 |
| Waterhouse Estates Limited | Real estate | 2002 |
| Watts Property Investments Ltd | Professional & scientific | 2006 |
| Waverlex Ltd | Manufacturing | 2003 |
| Waymark Projects Ltd | Construction | 2007 |
| WDL Ltd | Professional & scientific | 2000 |
| WE Make IT Happen LLP | | 2008 |
| Weald Civil Engineering Limited | Construction | 1988 |
| Weald Construction Limited | Wholesale & retail | 1986 |
| Weald Homes Ltd | Construction | 2003 |
| Weald Plant Hire Limited | Construction | 1993 |
| Weald Property Services Limited | Construction | 2007 |
| Wealth Improvement Network Tax LLP | | 2007 |
| Web Mechanics Limited | Information & communication | 1998 |
| Weight-Scan Limited | | 1984 |
| Wellington Square Natural Health Ltd | Other services | 2007 |
| Wenbry Services Limited | Real estate | 2002 |
| West European Semiconductor Technology Limited | Professional & scientific | 2005 |
| West Park Contracting Limited | Administrative & support | 2005 |
| Westbourne Gardens Management Company Limited | Households | 1992 |
| Westbourne Villas Management Company Limited | Households | 2001 |
| Westwood Studios Limited | Professional & scientific | 2016 |