| LE Petit Bistrot Limited | Extraterritorial | 2016 |
| LE Willows Dexters Limited | Wholesale & retail | 2023 |
| Le-May Limited | Information & communication | 2012 |
| Le-Pine Associates Limited | Professional & scientific | 2017 |
| LEA Construction (Norfolk) Ltd | Construction | 2023 |
| Lead Business Consultancy Limited | Professional & scientific | 2024 |
| Lead Genera Ltd | Professional & scientific | 2019 |
| Lead Generation Services Ltd | Information & communication | 2022 |
| Lead Intuition Limited | Professional & scientific | 2017 |
| Lead to Change Consulting Ltd | Professional & scientific | 2024 |
| Leadenhall Law Group Ltd | Professional & scientific | 2001 |
| Leadenhall Suit Co. (Norwich) Ltd | Wholesale & retail | 2004 |
| Leader Development Initiative Limited | Information & communication | 2006 |
| Leader Holdings Ltd | Extraterritorial | 2021 |
| Leader Logistics Services Ltd | Professional & scientific | 2018 |
| Leading Business Services Limited | Financial services | 2015 |
| Leading Edge Trainings Ltd. | Education | 2022 |
| Leading Healthcare Ltd | Health & social care | 2020 |
| Leading Procurement Ltd | Professional & scientific | 2023 |
| Leaf Care Group Ltd | Professional & scientific | 2015 |
| Leaf Care Services Ltd | Health & social care | 2009 |
| Leaf Expression Systems Limited | Professional & scientific | 2014 |
| Leaf Group Holding Ltd | Financial services | 2025 |
| Leafcutter Ventures Ltd | Professional & scientific | 2026 |
| Leah Beth Ltd | Information & communication | 2023 |
| Leah Cooper Consulting Limited | Professional & scientific | 2012 |
| Leah Spice Limited | Hospitality | 2019 |
| Lean Securities Ltd | Administrative & support | 2025 |
| Lean Tree EOT Limited | Administrative & support | 2023 |
| Lean Tree Limited | Information & communication | 2020 |
| Lear Industries Limited | Wholesale & retail | 2002 |
| Learner Flow Ltd | Education | 2025 |
| Learning Assessment and Neurocare Centre Limited | Health & social care | 2011 |
| Learning Enterprises Organisation Limited | Professional & scientific | 2012 |
| Learnzone Media Ltd | Education | 2018 |
| Lease of Life Home Care Ltd | Health & social care | 2015 |
| LEASE4LIFE Limited | Real estate | 2007 |
| Leashire Limited | Transport & logistics | 2022 |
| Leate Trading Ltd | Manufacturing | 2022 |
| Leatherex UK Ltd | Wholesale & retail | 2014 |
| Leave IT With ME Ltd | Administrative & support | 2010 |
| Leaves and Beans Ltd | Wholesale & retail | 2014 |
| Lebc Ltd | Wholesale & retail | 2022 |
| Lebogang Ltd | Health & social care | 2026 |
| LEC Hire Limited | Other services | 1985 |
| Lechel Limited | Real estate | 2023 |
| LED by Community C.I.C. | Administrative & support | 2025 |
| Ledan Windows Limited | Wholesale & retail | 1987 |
| Ledgerbird Limited | Wholesale & retail | 2016 |
| LEE Bailey Consulting Ltd | Information & communication | 2017 |
| LEE Builders (Cawston) Limited | Construction | 2013 |
| LEE Earing Engineering Solutions Limited | Construction | 2018 |
| LEE Mills Carpets Limited | Wholesale & retail | 2010 |
| LEE Rathbone Ltd | Professional & scientific | 2017 |
| Lee's Farms Norwich Ltd | Wholesale & retail | 2015 |
| Leeder Land Trustees Limited | Real estate | 2014 |
| Leeder Landholdings Limited | Real estate | 2014 |
| Leeders Animal Supplies Limited | Wholesale & retail | 2007 |
| Leeder’S E Limited | Real estate | 2025 |
| Leeds Textile Company Ltd | Manufacturing | 2013 |
| Leeon Limited | Wholesale & retail | 2018 |
| Leeway Domestic Violence & Abuse Services | Administrative & support | 1996 |
| Lefevre Future Foundations Limited | Construction | 2025 |
| Lefevre’S Studio Limited | Other services | 2026 |
| Lefroy Road Fish & Chips Ltd | Hospitality | 2024 |
| Legacy Building Contractors Ltd | Construction | 2018 |
| Legacy Connect Storage Ltd | Information & communication | 2020 |
| Legacy Holdings (Norwich) Limited | Other services | 2020 |
| Legacy Wills & Probate Limited | Other services | 2008 |
| Legal Estates (Midlands) Ltd | Real estate | 2018 |
| Legalblend Ltd | Information & communication | 2017 |
| Legally Secure Wills and Trusts Limited | Administrative & support | 2015 |
| Legarda Court Ltd | Real estate | 2015 |
| Legazpi Ltd | Wholesale & retail | 2019 |
| Legend Wellbeing Ltd | Professional & scientific | 2023 |
| Legislator 1656 Limited | Administrative & support | 2003 |
| Legislator 1657 Limited | Administrative & support | 2003 |
| Leicester Estates Management Ltd | Real estate | 2016 |
| Leicester House RTM Company Limited | Households | 2010 |
| Leigh Brickwork Ltd | Construction | 2007 |
| Leiston Book Festival Community Interest Company | Administrative & support | 2025 |
| Leiston Carpets Ltd | Wholesale & retail | 2009 |
| Leiston Tyre & Exhaust Limited | Wholesale & retail | 1987 |
| Leisure Accessories Limited | Transport & logistics | 1977 |
| Leisure Asset Development Ltd | Professional & scientific | 2014 |
| Leisure-Net Solutions Ltd | Information & communication | 2000 |
| Leisureland UK Limited | Arts & recreation | 2019 |
| LEJ Solutions Limited | Professional & scientific | 2024 |
| Lela's Cafe Limited | Hospitality | 2025 |
| Lemann Brothers Limited | Hospitality | 2016 |
| Lemarctech Ltd | Professional & scientific | 2025 |
| Lemon Head Tattoos Ltd | Other services | 2021 |
| Lemonade Pictures Ltd | Professional & scientific | 2023 |
| LEN Peters Properties | Other services | 1964 |
| Lenel Hair Studio Ltd | Other services | 2025 |
| Lenlow Limited | Financial services | 2021 |
| Lenox Retail Ltd | Wholesale & retail | 2021 |
| Lente Norfolk Limited | Professional & scientific | 2024 |
| Lenwade Electrical Services Ltd | Construction | 2011 |
| Lenwade Mill Management Limited | Households | 2000 |