| LE One Ltd | Other services | 2019 |
| Lead Property Development Limited | Real estate | 2021 |
| Leadership Skills Training Limited | Administrative & support | 1998 |
| Leading Human Ecosystems Ltd | Information & communication | 2024 |
| Leafy Layers Limited | Wholesale & retail | 2024 |
| Leana Limited | Other services | 2012 |
| Leap Platform Limited | Professional & scientific | 2024 |
| Leaping Fashion (UK) Company Limited | Wholesale & retail | 2021 |
| Learn With FUN Daycare Ltd | Health & social care | 2019 |
| Learning Through the Arts C.I.C. | Education | 2006 |
| Lease Extend Limited | Professional & scientific | 2016 |
| Lease Investments (Leic) Limited | Real estate | 2009 |
| Leba Productions Ltd | Information & communication | 2012 |
| LED Events Limited | Administrative & support | 2010 |
| LEE W Denham Financial Services (Wills) Ltd | Professional & scientific | 2025 |
| Lee's Asian Cuisine Ltd | Hospitality | 2019 |
| Leedan Investments Limited | Real estate | 1997 |
| Leedstown Timber Supplies Ltd | Wholesale & retail | 2019 |
| Leeming Dental & Facial Clinic Ltd | Health & social care | 2023 |
| Leeming Food and Wine Limited | Wholesale & retail | 2014 |
| Leewood Skip Hire Limited | Water & waste | 2002 |
| Lefroy Beauty Therapy Limited | Other services | 2014 |
| Left Turn Limited | Professional & scientific | 2011 |
| Legacy ARK Ltd | Real estate | 2023 |
| Legacy Land Investments Limited | Real estate | 2002 |
| Legalunite Limited | Administrative & support | 2020 |
| Legard Road Management Limited | Households | 2019 |
| Legato Logistics LLP | | 2015 |
| Legendre Company Limited | Financial services | 2014 |
| Legendre UK Limited | Construction | 2014 |
| Leigh Consultancy Limited | Other services | 2012 |
| Leighton Buzzar Ltd | Real estate | 2025 |
| Leisure Holdings Ltd | Real estate | 2017 |
| Lemberg Architecture and Design Ltd | Professional & scientific | 2024 |
| Lena HC Ltd | Other services | 2023 |
| Lenbet Developments Ltd | Real estate | 2024 |
| Lenco Consult Limited | Education | 2022 |
| Lendmind Ltd | Information & communication | 2025 |
| Leon Oscar Properties Ltd | Real estate | 2009 |
| Leonbeck Limited | Professional & scientific | 2020 |
| Leonjay Holdings Ltd | Real estate | 2019 |
| Leonus Ltd | Professional & scientific | 2024 |
| Leos Barnet Development Ltd | Real estate | 2019 |
| Leos Bexley Investment Ltd | Real estate | 2019 |
| Leos Camden Development Ltd | Real estate | 2019 |
| Leos Development Ltd | Real estate | 2016 |
| Leos East London Ltd | Real estate | 2017 |
| Leos Investment (Woking) Ltd | Real estate | 2018 |
| Leos Investment Holdings Ltd | Professional & scientific | 2020 |
| Leos Luton Development Limited | Real estate | 2018 |
| Leos Management Services Ltd | Real estate | 2018 |
| Leos Merton Investment One Ltd | Real estate | 2018 |
| Leos Merton Investment Two Ltd | Real estate | 2018 |
| Leos North London Ltd | Real estate | 2017 |
| Leos SW Development Ltd | Real estate | 2018 |
| Leos Templars Development Ltd | Real estate | 2021 |
| Leos Tower Bridge Development Ltd | Real estate | 2020 |
| Leos UK Investment Ltd | Real estate | 2020 |
| Leos Waterloo House Ltd | Real estate | 2021 |
| Leos Weybridge Development Ltd | Real estate | 2020 |
| Leos Weybridge Three Development Ltd | Real estate | 2021 |
| Leos Weybridge Two Developments Ltd | Real estate | 2021 |
| Leos Wimbledon Development Ltd | Real estate | 2018 |
| Lepcis Management Limited | Professional & scientific | 2021 |
| Lermer Secretarial Services Limited | Administrative & support | 2002 |
| LES Harrison Business Solutions Limited | Administrative & support | 2013 |
| Lessiters Holdings Limited | Financial services | 2019 |
| LET US Protect Limited | Administrative & support | 2018 |
| Letshare UK Ltd | Real estate | 2025 |
| LEV View Homes Limited | Real estate | 2015 |
| Levant Management Limited | Construction | 2017 |
| Levine Associates Limited | Professional & scientific | 2012 |
| Leviosa IT Ltd | Information & communication | 2023 |
| Levy Community Marketing Limited | Professional & scientific | 2022 |
| Lewis Landscaping Petersfield Ltd | Administrative & support | 2022 |
| Lexander Group Limited | Information & communication | 2021 |
| Lexus Properties Limited | Other services | 2012 |
| Lexworth Limited | Real estate | 2014 |
| Leyla Executive Function Ltd | Professional & scientific | 2022 |
| LF Gjabri Construction Ltd | Construction | 2022 |
| LFG Energy Systems Limited | Energy | 2025 |
| LFM Investments Ltd | Real estate | 2018 |
| LGI Productions Ltd | Arts & recreation | 2022 |
| LGP Bromley Limited | Construction | 2020 |
| LGP Old Oak Ltd | Real estate | 2021 |
| Liaison Brokerage Ltd | Wholesale & retail | 2016 |
| Liam French Robinson Limited | Arts & recreation | 2015 |
| Liandi Properties Ltd | Financial services | 2019 |
| Liavi Group Ltd | Wholesale & retail | 2026 |
| Liberty African Shop UK Limited | Hospitality | 2010 |
| Liberty Black Ltd | Real estate | 2019 |
| Liberty Gold Limited | Real estate | 2018 |
| Liberty House Clinic Limited | Health & social care | 2015 |
| Liburnia Wines Ltd | Wholesale & retail | 2024 |
| Licensed Carriage Hire Limited | Administrative & support | 2004 |
| Lidax Building Solutions Limited | Construction | 2015 |
| Liddell North East Limited | Professional & scientific | 2012 |
| Life Aesthetics Ltd. | Health & social care | 2017 |
| Life Bridging and Commercial Solutions Limited | Financial services | 2019 |
| Life Financial Solutions London Limited | Financial services | 2015 |