| Kubale Creative Ltd | Professional & scientific | 2017 |
| L and F Sweet Treats Ltd | Wholesale & retail | 2024 |
| L.A.Moore Limited | Construction | 1961 |
| LA Campagna Holiday Lets Ltd | Real estate | 2020 |
| LA Campagna Warminster Limited | Hospitality | 2018 |
| LA Chasse Limited | Wholesale & retail | 2009 |
| Lam-Board (Europe) Limited | Wholesale & retail | 1996 |
| Lani Developments Ltd | Real estate | 2020 |
| Larkhill Equestrian Limited | Arts & recreation | 2018 |
| Larksy Lou's Film Productions Ltd | Information & communication | 2025 |
| Lash Lounge Beauty Ltd | Other services | 2021 |
| Lashk Limited | Wholesale & retail | 2016 |
| Lazarillo Limited | Professional & scientific | 2009 |
| LC Distribution Warehouse Center Ltd | Transport & logistics | 2021 |
| Lc&V Services Ltd | Administrative & support | 2023 |
| LE Cafe Journal Ltd | Hospitality | 2016 |
| Leadervalues Limited | Professional & scientific | 2002 |
| Leaping Frogs Day Nursery C.I.C. | Education | 2012 |
| Leasegreen Property Management Limited | Households | 1990 |
| Leftshift Ltd | Information & communication | 2024 |
| Legacy World Ltd | Wholesale & retail | 2021 |
| Leleavono Ltd | Wholesale & retail | 2024 |
| Lemen Limited | Hospitality | 2020 |
| Libby Rhodes Limited | Extraterritorial | 2016 |
| Light and Touch Ltd | Construction | 2025 |
| Lighthouse Professional Care Limited | Health & social care | 2019 |
| Lightning Exhibitions Ltd | Construction | 2025 |
| Lindsay's Textiles Limited | Wholesale & retail | 2009 |
| Linked Resourcing Limited | Professional & scientific | 2016 |
| Lions of Longleat Limited | Arts & recreation | 2001 |
| Little Monkey Magic Ltd | Education | 2024 |
| Lloyd Specialist Developments Limited | Manufacturing | 2011 |
| LLR Project | Administrative & support | 2026 |
| LMH Wiltshire Services Ltd | Manufacturing | 2025 |
| Lo-Cal Cafe Bars Limited | Hospitality | 2003 |
| Lolari Limited | Wholesale & retail | 2021 |
| London Wine EIS Limited | Wholesale & retail | 2013 |
| Longitude Innovation Ltd | Professional & scientific | 2011 |
| Longleat Enterprises Limited | Arts & recreation | 1964 |
| Longleat Estate Holdings Limited | Administrative & support | 2018 |
| Longleat Estate Holdings Two Limited | Professional & scientific | 2021 |
| Love This Cheese Limited | Manufacturing | 2023 |
| Ltff Limited | Financial services | 2023 |
| Lucas Cosmin Ltd | Transport & logistics | 2018 |
| Luneview Ltd | Real estate | 2024 |
| Lurcher Ales Limited | Real estate | 2013 |
| Lyons Seafoods Limited | Manufacturing | 1994 |
| M C Accountancy & Business Services Limited | Professional & scientific | 2015 |
| M J Ayrton Plumbing and Heating Limited | Construction | 2012 |
| Mach Aero Limited | Other services | 2021 |
| Macs Pool Hall Limited | Arts & recreation | 2025 |
| Maguma Solutions Limited | Information & communication | 2018 |
| Majorglen Limited | Professional & scientific | 1985 |
| Malstrøm Limited | Information & communication | 2024 |
| Manictobes Limited | Professional & scientific | 2007 |
| Manor Yard Residents' Association Limited | Households | 1997 |
| Mansell&Fern Ltd | Arts & recreation | 2025 |
| MAP and Compass Consulting Ltd | Professional & scientific | 2024 |
| Margot & Mila Ltd | Manufacturing | 2016 |
| Mark Crabbe Ltd | Construction | 2003 |
| Mark Sangster Limited | Professional & scientific | 2012 |
| Mark's Garage Services (Pudsey) Limited | Wholesale & retail | 2017 |
| Market Movements Limited | Professional & scientific | 2025 |
| Marlowe's Makes Ltd | Arts & recreation | 2019 |
| Marsh & Chalfont Hire Limited | Wholesale & retail | 1989 |
| Marsh & Chalfont Limited | Wholesale & retail | 1973 |
| Martensite Services Ltd | Information & communication | 2018 |
| Martin Bros. Removals Limited | Transport & logistics | 2005 |
| Martin Consulting (Tooling) Limited | Manufacturing | 2024 |
| Martin Goodwin Logistical Support Ltd | Administrative & support | 2025 |
| Mason Arms Warminster Limited | Hospitality | 2018 |
| Mason Forestry Ltd | Professional & scientific | 2012 |
| Mathos Design Ltd. | Wholesale & retail | 2016 |
| Mattermorphic Ltd | Professional & scientific | 2026 |
| Maximum Wealth Ltd | Professional & scientific | 2022 |
| Maya Cuisine Wiltshire Ltd | Hospitality | 2016 |
| Mayflower TSP Limited | Professional & scientific | 2004 |
| Mccarthy Holdings (Warminster) Limited | Real estate | 1969 |
| Mcquade Utilities Limited | Construction | 2018 |
| Mead Under Bower Limited | Administrative & support | 2026 |
| Meaden Plumbing & Heating Ltd | Construction | 2024 |
| Mediation Wiltshire and West Limited | Professional & scientific | 2011 |
| Menu Shop Europe Limited | Manufacturing | 2016 |
| Mere Garage Limited | Wholesale & retail | 2002 |
| Mere Town Youth FC C.I.C. | Arts & recreation | 2025 |
| Mere Trout Ltd | Agriculture & fishing | 2018 |
| Merecat Lodge LLP | | 2025 |
| Merriman Consulting Limited | Professional & scientific | 2024 |
| Merrylegs and Company LLP | | 2007 |
| MGC Developments Limited | Construction | 2021 |
| Michael Fryer Limited | Professional & scientific | 2003 |
| Middleton & Upsall LLP | | 2004 |
| Midolu Limited | Real estate | 2017 |
| Miller Antiques Limited | Wholesale & retail | 2012 |
| Millers Close Management (Wylye) Limited | Hospitality | 1995 |
| Milwright Consulting Limited | Information & communication | 2012 |
| Minerva Stone Conservation Limited | Construction | 1996 |
| Miralys Ocean Innovation Ltd | Professional & scientific | 2025 |
| Miruki Limited | Wholesale & retail | 2024 |
| MLT Investments Limited | Real estate | 2019 |