| LCN Promotions Ltd | Health & social care | 2025 |
| LDC Demolition and Enabling Ltd | Construction | 2011 |
| LDM Distribution Ltd | Other services | 2014 |
| LDT Group Limited | Financial services | 2026 |
| LE Chef Consultancy Ltd | Hospitality | 2023 |
| LE Investments Limited | Real estate | 2024 |
| LE Spcie Ltd | Hospitality | 2023 |
| LEA Vale Teachers Limited | Education | 2015 |
| Leacroft Properties Limited | Real estate | 1972 |
| Lead Station Ltd | Wholesale & retail | 2025 |
| LEAD2WIN Limited | Professional & scientific | 2011 |
| Leader Property & Transport Ltd | Construction | 2019 |
| Leading Fabrics Limited | Wholesale & retail | 2004 |
| Leading Light Consultancy Ltd | Other services | 2023 |
| Leaf Coaching CIC | Professional & scientific | 2019 |
| Leaf Partnerships Ltd | Professional & scientific | 2020 |
| Leaf Tech Solutions Limited | Other services | 2013 |
| Leafields Properties Limited | Real estate | 1962 |
| Lean Carbon Limited | Energy | 2016 |
| Lean Data Limited | Information & communication | 2023 |
| Leanne S Studios Ltd | Professional & scientific | 2025 |
| Leap Community Trust | Education | 2009 |
| Learn in the Sun (UK) Ltd | Education | 2015 |
| Learn Online Ltd | Education | 2022 |
| Learning Enterprises Limited | Information & communication | 2021 |
| Learning IS Global Limited | Administrative & support | 2020 |
| Lecheros Ltd | Information & communication | 2025 |
| Lecico (UK) Limited | Financial services | 1990 |
| Lecico PLC | Wholesale & retail | 1987 |
| LED Music Ltd | Arts & recreation | 2025 |
| LEE Barbers UK Ltd | Other services | 2022 |
| LEE Kang Ltd | Health & social care | 2021 |
| LEE Moore & Sons Roofing Services Limited | Construction | 2015 |
| LEE Shaw Homes Limited | Real estate | 2024 |
| LEE Short Limited | Construction | 2015 |
| Leemillslight Limited | Administrative & support | 2014 |
| Leeson Electrical Ltd | Construction | 2015 |
| Lee’S Kitchen Bedford Limited | Hospitality | 2023 |
| Left LEG Services Limited | Construction | 2016 |
| Left Properties Ltd | Real estate | 2024 |
| Legacy & Heritage Properties Ltd | Real estate | 2024 |
| Legacy Plumbing and Heating Ltd | Construction | 2024 |
| Legah Architecture Ltd | Professional & scientific | 2017 |
| Legal Excel Limited | Administrative & support | 2012 |
| Legal Problem Solvers Limited | Professional & scientific | 2011 |
| Legends Barber Kemp Ltd | Other services | 2026 |
| Legend’S Barber Ltd | Other services | 2022 |
| Leggott Electrical Installations Limited | Construction | 2019 |
| Lehal Property Investments Limited | Real estate | 2021 |
| Lehane Consulting Limited | Professional & scientific | 2023 |
| Leidos Security Detection & Automation U.K. Ltd. | Information & communication | 1997 |
| Leiston Residents Limited | Households | 2008 |
| Leito Limited | Information & communication | 2008 |
| LEL Catering Ltd | Hospitality | 2024 |
| Lela Ltd | Wholesale & retail | 2009 |
| Lemonade House Ltd | Professional & scientific | 2025 |
| Lemron Ltd | Transport & logistics | 2019 |
| LEN Arlo Limited | Real estate | 2023 |
| Lendon Grove Management Company Limited | Real estate | 2018 |
| Lendwise Mortgage Solutions Ltd | Financial services | 2024 |
| Lens on Time Limited | Professional & scientific | 2025 |
| Lenti Consulting Ltd | Professional & scientific | 2025 |
| Lenze Limited | Wholesale & retail | 1969 |
| Leodel Group Ltd | Construction | 2022 |
| Leon Barnett Football Academy Limited | Arts & recreation | 2018 |
| Leon Property Management Limited | Real estate | 2018 |
| Leonard Ames(Ampthill)Limited | Wholesale & retail | 1958 |
| Lero Consulting Ltd | Wholesale & retail | 2022 |
| Lero Properties Limited | Real estate | 2023 |
| Less Stress Solutions Ltd | Administrative & support | 2021 |
| Leston Holdings Ltd | Real estate | 2025 |
| Let's GET Going Community Interest Company | Administrative & support | 2018 |
| Let's Party Forever Limited | Wholesale & retail | 2017 |
| Lethologica Ltd | Professional & scientific | 2021 |
| Lets DO Leads Ltd | Information & communication | 2021 |
| Lets Go Chalets Limited | Real estate | 2024 |
| Lets Go Property Management Ltd | Households | 2018 |
| Letterbox Cocktails Ltd | Wholesale & retail | 2023 |
| Letters & Lines Creative Limited | Professional & scientific | 2020 |
| Lettuce Solve Ltd | Other services | 2016 |
| Letupp Limited | Real estate | 2021 |
| Levarias Ltd | Administrative & support | 2022 |
| Level Five Supplies Limited | Professional & scientific | 2018 |
| Level UP Site Services Ltd | Construction | 2024 |
| Levene Brickwork Construction Ltd | Construction | 2025 |
| Levent Fndk Ltd | Wholesale & retail | 2026 |
| Lever Property Services Limited | Real estate | 2017 |
| Leverets Holdings Limited | Real estate | 2025 |
| Leverets Investments Limited | Households | 2020 |
| Levinath Ltd | Administrative & support | 2021 |
| Levnik Consultancy Ltd | Information & communication | 2013 |
| Lewco-Pak Limited | Wholesale & retail | 1993 |
| Lewis Rentals Limited | Real estate | 2018 |
| Lewitech Engineering Ltd | Construction | 2025 |
| Lewzey Smith Holdings Limited | Financial services | 2023 |
| LEX Productions Limited | Information & communication | 2024 |
| LF Catering Ltd | Hospitality | 2026 |
| LFR Resonance Systems Ltd | Professional & scientific | 2025 |
| Lgbt Bedfordshire CIC | Education | 2021 |
| LGS Contractors Ltd | Transport & logistics | 2025 |