| LCD Image Limited | Arts & recreation | 2014 |
| LCD PM Ltd | Professional & scientific | 2024 |
| LCM (Holdings) Limited | Administrative & support | 2001 |
| LCS Therapeutic Treatments Ltd | Other services | 2017 |
| LCSLOGISTICS1 Ltd | Transport & logistics | 2025 |
| LD Plant Hire (IOW) Ltd | Administrative & support | 2024 |
| Ldhl Limited | Manufacturing | 2024 |
| Ldlj Limited | Administrative & support | 2020 |
| LE Bottos Ltd | Manufacturing | 2025 |
| LE Consultancy Limited | Real estate | 2025 |
| Lead Spectrum Limited | Professional & scientific | 2021 |
| Lead Your Own Narrative Social Ltd | Professional & scientific | 2024 |
| Leaderful Action Limited | Administrative & support | 2008 |
| Leadify Hub Limited | Administrative & support | 2024 |
| Leading Edge Contracting Ltd. | Information & communication | 2015 |
| LEADINGSCHS2SUCCESS Ltd | Professional & scientific | 2014 |
| Leadline Marketing IOW Ltd | Administrative & support | 2024 |
| Leadworks Media Limited | Professional & scientific | 2026 |
| Lean Forward Consultancy Ltd | Professional & scientific | 2024 |
| Learning Barn IOW Ltd | Education | 2023 |
| Learning Trade Skills Ltd | Education | 2022 |
| Leasha Sparkles Ltd | Wholesale & retail | 2025 |
| Leather Taylor Limited | Other services | 1997 |
| Lectroheat Industrial Heating Limited | Manufacturing | 2001 |
| LEE Cartwright Roofing Services Limited | Construction | 2023 |
| LEE Churcher Ltd | Construction | 2025 |
| LEE Crook Carpentry Ltd | Manufacturing | 2025 |
| LEE Meek Photography Ltd | Professional & scientific | 2017 |
| Leeair Conditioning & Refrigeration Limited | Construction | 2020 |
| Leef Trading Limited | Administrative & support | 2016 |
| Leeway 29 Limited | Professional & scientific | 2014 |
| Leeway Auto Repairs Limited | Wholesale & retail | 2020 |
| Legacy Racing Club Limited | Administrative & support | 2019 |
| Legal Services for Business Limited | Professional & scientific | 2012 |
| Legge Property Investments Ltd | Real estate | 2026 |
| Legion Logistics Ltd | Administrative & support | 2014 |
| Legix Insights Ltd | Professional & scientific | 2025 |
| Leigh Alexandra Limited | Manufacturing | 2023 |
| Leigh Thomas & Co.Limited | Real estate | 1935 |
| Leighton Carter Insulation Co. Limited | Construction | 1973 |
| Leighton James Plumbing & Heating Ltd | Construction | 2017 |
| Leighton Mount Limited | Households | 1989 |
| Leisure Workwear Limited | Manufacturing | 1973 |
| Lelii Estates Limited | Real estate | 2020 |
| Lemkes Limited | Wholesale & retail | 2019 |
| Lemon Jelly Press CIC | Information & communication | 2025 |
| Lemos Catering Limited | Hospitality | 2025 |
| Lemuria Retreat Limited | Wholesale & retail | 2011 |
| Lenahan Properties Ltd | Real estate | 2021 |
| Leninton Company (UK) Limited | Real estate | 2016 |
| Leninton Developments Ltd | Construction | 2024 |
| Lenno Foods Ltd | Hospitality | 2019 |
| LEO International Trans Ltd | Transport & logistics | 2017 |
| Leonards Services Ltd | Households | 2021 |
| Leslie Wise Limited | Manufacturing | 1966 |
| Lesmaada Ltd | Administrative & support | 2018 |
| Lesylla Ltd | Wholesale & retail | 2022 |
| LET IT Rock Music Limited | Manufacturing | 2019 |
| LET IT Roll CIC | Arts & recreation | 2020 |
| Let's Drive Digital Ltd | Information & communication | 2021 |
| Let's Go Wyld Limited | Arts & recreation | 2019 |
| Lethanya Limited | Health & social care | 2014 |
| Letrucco Design Limited | Professional & scientific | 2014 |
| Lets Move Property Management (Midlands) Ltd | Real estate | 2013 |
| Levantine Homes Limited | Construction | 2004 |
| Level 3 Healthcare Ltd | Health & social care | 2024 |
| Level Commercial Services Limited | Professional & scientific | 2023 |
| Levingate Limited | Health & social care | 2015 |
| Lewis & Co (Wales) Limited | Professional & scientific | 2005 |
| Lewis & Manley Holdings Limited | Professional & scientific | 2002 |
| Lewis & SON Electrical Services Ltd | Construction | 2005 |
| Lewis Advisory Limited | Professional & scientific | 2026 |
| Lewis Carpentry IOW Ltd | Construction | 2026 |
| Lewis Construction Management Ltd | Construction | 2020 |
| Lewis Mobile Barbers Ltd | Other services | 2026 |
| Lewis Painting Ltd | Construction | 2021 |
| Lewis Taylor Development Limited | Real estate | 2013 |
| Lewis, J Ltd | Other services | 2016 |
| Lewtmf Ltd | Construction | 2024 |
| Lezar Finance Ltd | Public administration | 2024 |
| LF Blades Limited | Professional & scientific | 2025 |
| LF PT & Coaching Ltd | Arts & recreation | 2024 |
| LFP Telecoms Ltd | Information & communication | 2024 |
| LG Maintenance Ltd | Wholesale & retail | 2022 |
| LGK Capital Limited | Financial services | 2015 |
| LGP Holdings Limited | Real estate | 2026 |
| LH Building and Maintenance Ltd | Construction | 2025 |
| LH Jones & Co Limited | Agriculture & fishing | 2015 |
| LHN Engineering Ltd | Construction | 2025 |
| LHP Properties Ltd | Real estate | 2025 |
| Liam Stafford Funeral Directors & Stonemasons Limited | Other services | 2023 |
| Liberty Care at Home Ltd | Health & social care | 2023 |
| Liberty Steel Newport Limited | Manufacturing | 2008 |
| Liberus Ltd | Wholesale & retail | 2019 |
| Librit Ltd | Wholesale & retail | 2023 |
| Licensing Works Limited | Professional & scientific | 2018 |
| Life Cover Direct Ltd | Financial services | 2013 |
| Life Funerals Ltd | Other services | 2026 |
| Life Tree Financial Ltd | Financial services | 2026 |
| Lifeline Alarm Systems Limited | Administrative & support | 1990 |