| Laminar Consulting Ltd | Professional & scientific | 2025 |
| Lan's Nails Ltd | Other services | 2017 |
| Landscaping Automated Ltd | Information & communication | 2026 |
| Landserve (Wiltshire) Ltd | Other services | 2005 |
| Langford Construction Limited | Construction | 2003 |
| Langford Contractors Ltd. | Construction | 2007 |
| Langley Design Limited | Professional & scientific | 2010 |
| Langley Marketing Limited | Manufacturing | 2006 |
| Langley Marketing Trustees Limited | Professional & scientific | 2023 |
| Lanhill Alpacas Ltd | Wholesale & retail | 2023 |
| Lansdown Contractors Limited | Construction | 2013 |
| Lantern Bloodstock Ltd | Wholesale & retail | 2024 |
| LAP 911 Ltd | Wholesale & retail | 2022 |
| Laplas Consult and Management Services Limited | Real estate | 2025 |
| Lapwing Developments Limited | Construction | 2010 |
| Larcn Ltd | Information & communication | 2004 |
| Lascalla Trimshop Ltd | Wholesale & retail | 2024 |
| Laser CUT Designs Ltd. | Manufacturing | 2011 |
| Laser Data Systems Limited | Information & communication | 2007 |
| Laser Machines Ltd | Wholesale & retail | 2018 |
| Laser Marketing Ltd | Professional & scientific | 2019 |
| Laser Property Investments Ltd | Real estate | 2021 |
| Laser Queen Ltd | Other services | 2024 |
| Laser Quest (Blackpool) Limited | Arts & recreation | 2012 |
| Laser TAG Leisure Limited | Arts & recreation | 2008 |
| Laserclaycotswolds Ltd | Arts & recreation | 2024 |
| Lasergaming Limited | Manufacturing | 2024 |
| Laserquest Swindon Limited | Arts & recreation | 2008 |
| Laserwise Limited | | 1987 |
| Lasting Care Services Ltd | Administrative & support | 2022 |
| Laszlo Property Development Ltd | Construction | 2016 |
| Laszlo RP Limited | Construction | 2023 |
| Latan Care Limited | Health & social care | 2023 |
| Latch Investments Ltd | Financial services | 2025 |
| Late Night Kebab Ltd | Hospitality | 2021 |
| Latek Limited | Information & communication | 2024 |
| Lateral Root Publishing Limited | Information & communication | 2023 |
| Latham Road Management Company Ltd | Households | 2022 |
| Latin America Legal Ltd | Hospitality | 2010 |
| Laurence Harris Limited | Transport & logistics | 2016 |
| Laurence Shahlaei Limited | Arts & recreation | 2016 |
| Laurence Shahlaei Strength Coaching Ltd | Arts & recreation | 2022 |
| Laurens Caterers Ltd | Hospitality | 2006 |
| Laurentiana Ltd | Health & social care | 2018 |
| Lavish Nails PLA Ltd | Other services | 2023 |
| Law and Property Ltd | Real estate | 2024 |
| Law Industries Ltd | Information & communication | 2022 |
| Law's Logistics Ltd | Transport & logistics | 2023 |
| Lawatch Ltd | Hospitality | 2024 |
| Lawlor Electrical Ltd | Construction | 2025 |
| Lawn Doctor (Swindon) Limited | Professional & scientific | 2011 |
| Lawn Entertainment Ltd | Arts & recreation | 2010 |
| Lawrence Dale Court (Freehold) Limited | Households | 2014 |
| Lawrence Riley Ltd | Financial services | 2024 |
| Lawrence Rose Limited | Professional & scientific | 2002 |
| Lawrence Wills a S Ltd | Professional & scientific | 2005 |
| Lawrencedale Court Management Company Limited | Households | 1987 |
| Lawrie Consultancy Limited | Information & communication | 2022 |
| Lawson Asset Holdings Limited | Financial services | 2023 |
| Lawson Demolition (UK) Limited | Construction | 2012 |
| Lawson Demolition Limited | Construction | 1991 |
| Lawson Environmental Limited | Construction | 2006 |
| Lawtech 365 Ltd | Information & communication | 2020 |
| Lawton IT Solutions Limited | Information & communication | 2025 |
| Laxon Support Services Limited | Health & social care | 2025 |
| LAY Construction Ltd | Construction | 1983 |
| LAY Holdings Limited | Professional & scientific | 1994 |
| Laynes Farm Two Limited | Professional & scientific | 2016 |
| Layoudi Ltd | Wholesale & retail | 2024 |
| LB Carpentry Ltd | Construction | 2024 |
| LB Ducting Services Limited | Construction | 2012 |
| Lbbg Property Limited | Real estate | 2016 |
| LC Boys Transport Ltd | Transport & logistics | 2026 |
| LC Wilks Limited | Professional & scientific | 2023 |
| LCR Trading Direct Ltd | Wholesale & retail | 2024 |
| LD Heating Services Limited | Construction | 2021 |
| LD Pharma Services Ltd | Health & social care | 2022 |
| LDA Dance LLP | | 2022 |
| LDA Franchising Ltd | Education | 2022 |
| LDJ Vehicle Finance Limited | Financial services | 2024 |
| Ldok Services Ltd | Administrative & support | 2026 |
| Ldpc Enterprises Limited | Wholesale & retail | 2023 |
| Ldreamedu Ltd | Education | 2024 |
| LDS Plumbing & Heating Limited | Construction | 2014 |
| LE Gresley Consulting Ltd | Information & communication | 2026 |
| LE Leivre Technology Ltd | Professional & scientific | 2012 |
| LE Petit Beauty Room Limited | Other services | 2010 |
| LE ROI Global Solutions Ltd | Professional & scientific | 2025 |
| LEA Development Ltd | Construction | 2024 |
| Leadership M.A. Limited | Professional & scientific | 2007 |
| Leading Change Limited | Professional & scientific | 2008 |
| Leading Resolutions Limited | Information & communication | 2001 |
| Leadnetics Limited | Extraterritorial | 2024 |
| Learn Realism Ltd | Education | 2023 |
| Learn Shona Limited | Education | 2023 |
| Learn Zone Limited | Education | 2023 |
| Learnabout Childcare Limited | Health & social care | 2026 |
| Learning Tree Pre-School ( Swindon ) Limited | Education | 2019 |
| Learnovate Intercontinental Ltd | Professional & scientific | 2025 |
| Leasehold Homes Ltd | Households | 2019 |