| LA Conversion Limited | Construction | 2018 |
| Lackham Wcuc Ltd | Professional & scientific | 2022 |
| Lacock IT Limited | Information & communication | 2012 |
| Ladydown Meadows Ltd | Hospitality | 2025 |
| Lakshmi Gautam Limited | Health & social care | 2025 |
| Laku Group Ltd | Wholesale & retail | 2020 |
| Laku Retail UK Ltd | Wholesale & retail | 2019 |
| Lalo Developments Ltd | Real estate | 2021 |
| Lanatar Ltd | Professional & scientific | 2012 |
| Land at Station Road Limited | Other services | 2023 |
| Landell Mills Limited | Professional & scientific | 1981 |
| Langham Park Homes Limited | Real estate | 2016 |
| Lansdown Group Ltd | Wholesale & retail | 2016 |
| Lansdowne 71 Limited | Real estate | 2017 |
| Lansdowne Pro TEM Ltd | Professional & scientific | 2013 |
| Laregan House Management Company Limited | Households | 2023 |
| Last MAN Limited | Information & communication | 2019 |
| Lawes Steel Fabrications Limited | Construction | 2013 |
| Layzell Property Management Limited | Real estate | 2020 |
| LB Dent Therapy Ltd | Health & social care | 2022 |
| Leader Garages Limited | Extraterritorial | 2001 |
| Leaper Land Management Limited | Administrative & support | 2017 |
| Leaper Land Promotion Limited | Administrative & support | 2017 |
| Leave IT Ltd | Construction | 2024 |
| Ledger Logic Ltd | Extraterritorial | 2024 |
| LEE Beck 71 Limited | Real estate | 2017 |
| LEE Beck 72 Limited | Real estate | 2017 |
| Leigh Adams Associates Limited | Professional & scientific | 2017 |
| Leigh Park Garden Machinery Ltd. | Wholesale & retail | 1998 |
| Leonid Developments Limited | Construction | 2025 |
| Levettmi Ltd | Administrative & support | 2013 |
| Levinson Manufacturing Limited | Manufacturing | 2023 |
| Lewis Revill Limited | Information & communication | 2024 |
| Lexingtons Property Management and Maintenance Limited | Construction | 2015 |
| LG Landscapes Limited | Administrative & support | 2019 |
| Liddiard Builders Limited | Construction | 2016 |
| Life Integration Limited | Professional & scientific | 2018 |
| Lily & Marsh Limited | Information & communication | 2018 |
| Limelight Electrical Ltd | Construction | 2018 |
| LIN Care(Wiltshire) Ltd | Health & social care | 2025 |
| Lindens Court Management Company (NO.2) Limited | Households | 1985 |
| Lindops Landscaping&Construction Ltd | Construction | 2024 |
| Lines & Levels Limited | Construction | 2013 |
| Linn Electrical Contractors Limited | Construction | 2002 |
| Liontek Limited | Manufacturing | 2025 |
| Liquifyah Limited | Manufacturing | 2014 |
| Lisa Smith Agencies Limited | Wholesale & retail | 2016 |
| Little Bridges Nursery Ltd | Health & social care | 2026 |
| Little Sleepover Parties Ltd | Administrative & support | 2020 |
| Live Your Eden Ltd | Wholesale & retail | 2023 |
| LJH Landscaping Ltd | Administrative & support | 2022 |
| Lloyd Brothers (Bristol) Limited | Real estate | 1947 |
| Lloyd-Williams Hospitality Limited | Hospitality | 2022 |
| Lmjm LLP | | 2018 |
| Lntb Holdings Ltd | Hospitality | 2022 |
| Lobelia I Ltd | Real estate | 2013 |
| Local Tastemaker Ltd | Wholesale & retail | 2025 |
| Logistik Transport Ltd | Manufacturing | 2025 |
| London Theatre Tours Ltd | Administrative & support | 2012 |
| Longscroft Children's Nursery School Limited | Education | 2006 |
| Lord Stone Properties Limited | Construction | 2023 |
| Lornamead Acquisitions Limited | Professional & scientific | 2004 |
| Lornamead Group Limited | Professional & scientific | 2007 |
| Lornamead UK Limited | Manufacturing | 1983 |
| Lottie and P Apartments Limited | Real estate | 2025 |
| Lottways Group Limited | Financial services | 2023 |
| Louisa Homecare Limited | Health & social care | 2015 |
| Love My LOT Ltd | Wholesale & retail | 2014 |
| LPH 15 Limited | Real estate | 2018 |
| LPH 26 Limited | Real estate | 2018 |
| LPH 36 Limited | Real estate | 2018 |
| LPH 38 Limited | Real estate | 2018 |
| LPH 7 Limited | Real estate | 2018 |
| LPH Group Holdings Limited | Financial services | 2019 |
| LPH SPV 10 Limited | Extraterritorial | 2017 |
| LS Home Construction Ltd | Construction | 2018 |
| LSP GAS Services Ltd | Manufacturing | 2009 |
| LTT of Trowbridge Ltd | Education | 2020 |
| Lubricant Trading Ltd | Wholesale & retail | 2025 |
| Lucky Triple Eight Limited | Professional & scientific | 2010 |
| Lucy Mcgrath Photography Ltd | Professional & scientific | 2015 |
| Luminal Digital Ltd | Professional & scientific | 2024 |
| Luminal Support Ltd | Information & communication | 2024 |
| Luminal Websites Ltd | Professional & scientific | 2026 |
| Luneth Grove Ltd | Wholesale & retail | 2025 |
| Lunty Limited | Construction | 2026 |
| Luped Ltd | Professional & scientific | 2007 |
| Lviii Ltd. | Real estate | 2016 |
| LVR Consultancy Ltd | Professional & scientific | 2019 |
| Lymics Ventures Limited | Health & social care | 2012 |
| Lynn Payne Consultancy Limited | Professional & scientific | 2004 |
| M & B Construction Wiltshire Limited | Construction | 2018 |
| M Adams IT Ltd | Information & communication | 2021 |
| M and a Ironmongery Ltd | Wholesale & retail | 2016 |
| M Cars N Parts Ltd | Wholesale & retail | 2024 |
| M D Hall Carpentry Contractors Ltd | Construction | 2018 |
| M E Automotive Limited | Wholesale & retail | 2017 |
| M G Housing Limited | Real estate | 2007 |
| M G Property UK Ltd. | Real estate | 1966 |
| M J Blake Racing Limited | Arts & recreation | 1997 |