| Hooks Haulage Limited | Transport & logistics | 2006 |
| Hopton Park (2004) Management Limited | Hospitality | 2004 |
| Horner Roberts Ltd | Manufacturing | 2004 |
| Hospitality Services Ltd | Hospitality | 2003 |
| Howman Consultants Limited | Professional & scientific | 1989 |
| HOY Enterprises Limited | Arts & recreation | 2003 |
| Hport Limited | Information & communication | 1997 |
| HS Anderson Ltd | Information & communication | 2007 |
| Hudaco Limited | Administrative & support | 2002 |
| Hugh Davies & Co Limited | Professional & scientific | 2002 |
| Hulbert & Woodall Print Limited | Manufacturing | 2009 |
| Hungref Limited | Construction | 1992 |
| Huntor Limited | Professional & scientific | 2004 |
| Hush Sleep Collection Limited | Professional & scientific | 1982 |
| Hutchins Builders Limited | Construction | 2003 |
| HW Wiltshire Limited | Hospitality | 2017 |
| I.N. Newman Limited | Other services | 1988 |
| IAN James Promotions Limited | Arts & recreation | 2002 |
| IAN Milne Limited | Construction | 2006 |
| IAN Young Building Ltd | Construction | 2001 |
| Indigo Tech Ltd | Information & communication | 2025 |
| Industrial Electronic Support Limited | Manufacturing | 1998 |
| Intelligent Planning and Scheduling Systems Ltd | Information & communication | 2007 |
| Interlink Salisbury | | 1993 |
| Invertix Limited | Information & communication | 2001 |
| ION Engineering Limited | Information & communication | 2006 |
| IT Defence Ltd | Information & communication | 2007 |
| IT Dependent Limited | Information & communication | 2007 |
| IT Secure Solutions Ltd | Information & communication | 2007 |
| Itechnic Limited | Professional & scientific | 2002 |
| J R Cookson (Contracting) Limited | Wholesale & retail | 1997 |
| J. & L. Perry Transport Ltd | Transport & logistics | 2003 |
| J. a. Wilson & SON Limited | Real estate | 2002 |
| J. Hayes Site Services Limited | Construction | 2004 |
| J. Mcquaid Electrical Services Ltd. | Construction | 2004 |
| Jackson Mcconnell Ltd | Information & communication | 2006 |
| Jarvis Group Trustees Limited | Professional & scientific | 2006 |
| Jarvis Holdings Limited | Professional & scientific | 1990 |
| JJ and S (Chippenham) Limited | Health & social care | 2004 |
| JJW Construction Limited | Construction | 2006 |
| JOE Hughes Boxing Limited | Arts & recreation | 2010 |
| John Steward Jewellers Limited | Wholesale & retail | 2003 |
| Jolly Roger Adventure Limited | Arts & recreation | 2000 |
| JON Burtons Services Limited | Administrative & support | 2003 |
| JP Key Consulting Ltd | Information & communication | 2012 |
| Julian Edwards Interiors Limited | Transport & logistics | 1991 |
| K.J.W. Flooring Limited | Construction | 2003 |
| K.M.T Computers Ltd | Professional & scientific | 2003 |
| K8 Limited | Arts & recreation | 2004 |
| Kaliber Homes Limited | Construction | 1989 |
| Kaluc Ltd | Real estate | 2006 |
| Kalupa Developments Limited | Construction | 2006 |
| Kalvista Pharmaceuticals Limited | Professional & scientific | 2011 |
| Kandu Arts for Sustainable Development Limited | Education | 2005 |
| Kate Negus Saddlery Ltd | Wholesale & retail | 2003 |
| KDF Accounting Services Ltd | Administrative & support | 2005 |
| Khaira Enterprise Limited | Hospitality | 2005 |
| Kindco Limited | Wholesale & retail | 2002 |
| King Quench Limited | Hospitality | 2015 |
| Kingfisher Independent Financial Planning LLP | | 2007 |
| Kings Isle Limited | Extraterritorial | 2005 |
| Kingsley Pike Estate Agents Limited | Real estate | 2005 |
| Komsult Limited | Information & communication | 2006 |
| L & J Windows Limited | Other services | 2003 |
| Ladyswood Farm & Stud LLP | | 2017 |
| Land Locked Limited | Construction | 2000 |
| Lane Group PLC | Extraterritorial | 1969 |
| Langley Court (Chippenham) Management Company Limited | Hospitality | 1989 |
| Lanning & Griffin Landscaping LLP | | 2006 |
| Lansdowne Telecom Limited | Information & communication | 2005 |
| Larkfield Management Limited | Households | 1988 |
| LEE Hayden Designs Limited | Manufacturing | 2006 |
| LEE Jackson Developments Ltd | Construction | 2022 |
| Leehurst Swan Limited | Education | 1988 |
| Legal Software Limited | Extraterritorial | 1995 |
| Lighthouse Partners (UK) Limited | Real estate | 2000 |
| Lime Tree Houses Limited | Real estate | 2007 |
| Lindley Brothers Ltd. | Real estate | 2024 |
| Little Chalfield Farms Limited | Agriculture & fishing | 1996 |
| Lival (UK) Limited | Professional & scientific | 2001 |
| Local Authority Solutions Limited | Administrative & support | 2006 |
| Lock and Key Limited | Real estate | 2006 |
| Long Ashton Cricket Club Limited | Arts & recreation | 2025 |
| Longscroft Manor Limited | Hospitality | 2020 |
| Lord’S Cricket Estate Limited | Real estate | 2025 |
| Lower Woodford Management Company Limited | Water & waste | 1999 |
| LTV Project Ltd | Construction | 2022 |
| Lucknam Park Hotels Limited | Hospitality | 1987 |
| Luminous Energy Nominees Limited | Extraterritorial | 2024 |
| Lydiard Heating Limited | Construction | 2003 |
| M K & G Limited | Real estate | 2001 |
| M S Supply Chain Consulting Limited | Administrative & support | 2008 |
| M T Equipment Limited | Agriculture & fishing | 2003 |
| M.P.D. Commercial Finance Limited | Financial services | 2002 |
| Magnet Sales and Service Limited | Manufacturing | 1993 |
| Magnum Air Cargo Limited | | 1983 |
| Main-Care Limited | Construction | 2000 |
| Managing Change Limited | Information & communication | 1998 |
| Manentia Limited | Professional & scientific | 2007 |
| Manor Developments (Salisbury) Limited | Construction | 1999 |