| LEW Brockhurst & Sons Ltd | Construction | 2014 |
| Lewis Adams Ltd | Manufacturing | 2025 |
| Lewis Goodall Media Ltd | Information & communication | 2022 |
| Lewis Horsley Coaching Limited | Education | 2023 |
| Lewisham Grainger Holdings LLP | | 2018 |
| Lewisham Schools Project Limited | Other services | 2006 |
| LEX Insight Legal Solutions Ltd | Professional & scientific | 2024 |
| LEX Loci Limited | Real estate | 2005 |
| Lexelina Designs Ltd | Wholesale & retail | 2021 |
| Lexi Fashion Limited | Wholesale & retail | 2024 |
| Lexica Communications Limited | Professional & scientific | 2005 |
| Lexicon CRE Limited | Real estate | 2013 |
| Lexmile Limited | Health & social care | 2011 |
| Lexmile Trading Limited | Hospitality | 2016 |
| Lexsecurity Ltd | Administrative & support | 2025 |
| Lexson Consultancy Ltd | Construction | 2014 |
| Lexy Properties Ltd | Real estate | 2025 |
| Lexys Nannies Ltd | Financial services | 2024 |
| Lezzet Newcastle Ltd | Hospitality | 2026 |
| LFC Group Ltd | Wholesale & retail | 2021 |
| Lfcompany Ltd | Wholesale & retail | 2023 |
| LFT Electrical and Security Systems Ltd | Construction | 2022 |
| LG Property and Maintenance Limited | Households | 2023 |
| LG Utilities Ltd | Construction | 2017 |
| LG Welding & Fabrication Ltd | Professional & scientific | 2020 |
| Lgair Limited | Real estate | 2017 |
| LH (NE) Ltd | Other services | 2021 |
| LH Medicolegal Ltd | Public administration | 2023 |
| Lhcr Holdings Ltd | Hospitality | 2017 |
| LI MA North East Ltd | Other services | 2026 |
| LI Qiao Limited | Real estate | 2024 |
| LIA93 Limited | Other services | 2012 |
| Lialto Ltd | Households | 2026 |
| Liam Grimes Formwork Limited | Construction | 2025 |
| Liam's Tyres Limited | Wholesale & retail | 2026 |
| Liberdade Community Development Trust | Arts & recreation | 2008 |
| Liberdade Trading Limited | Hospitality | 2016 |
| Liberty Green Management Limited | Real estate | 2002 |
| Liberty Property Letting Ltd | Real estate | 2019 |
| Liberty Republic Leisure Limited | Hospitality | 2019 |
| Liberty School Ltd | Education | 2024 |
| Liddell Estates Group Limited | Real estate | 2025 |
| Liddicoat Property Ltd | Real estate | 2021 |
| Lider Polish Shop Ltd | Wholesale & retail | 2024 |
| Life Cafe and Lounge Limited | Hospitality | 2023 |
| Life Homes (York Place) Management Company Limited | Households | 2005 |
| Life Lived Better Ltd | Health & social care | 2024 |
| Life News Newcastle Ltd | Wholesale & retail | 2019 |
| Life Shift North East CIC | Health & social care | 2025 |
| Life Sorted NE Ltd | Other services | 2025 |
| Lifea Ltd | Information & communication | 2025 |
| Lifecircle (PVT) Ltd | Wholesale & retail | 2023 |
| Lifestyle Care (North East) Limited | Health & social care | 2022 |
| Lifestyle Care (North East) Opco Limited | Health & social care | 2023 |
| Lifestyle Care (North East) Propco Limited | Real estate | 2023 |
| Lifestyle Concepts Ltd | Construction | 2021 |
| Lifestyle Express KK Ltd | Wholesale & retail | 2019 |
| Lifestyle K.B.B. Ltd | Wholesale & retail | 2009 |
| Lifestyle Legacy Coaching Ltd | Arts & recreation | 2026 |
| Lifetime Plumbing & Heating (NE) Ltd | Construction | 2017 |
| Lift Solutions NE Ltd | Manufacturing | 2014 |
| Lift With Samantha Ltd | Other services | 2025 |
| Lift-Rite Engineering Services Limited | Other services | 2004 |
| Lift-Rite Holdings Limited | Professional & scientific | 2008 |
| Lifting Logistics UK Limited | Construction | 2013 |
| Liftupp Limited | Information & communication | 2015 |
| Light Bulb Estates Ltd | Real estate | 2026 |
| Light Bulb Group Ltd | Real estate | 2020 |
| Light Bulb Properties Ltd | Real estate | 2019 |
| Light Green Investments Ltd | Real estate | 2020 |
| Light UP the Toon Limited | Administrative & support | 2022 |
| Lighthouse Architecture Limited | Professional & scientific | 2019 |
| Lighthouse North East Limited | Administrative & support | 2009 |
| Lightning Energy Limited | Energy | 2020 |
| Lightning Social Ltd | Professional & scientific | 2018 |
| Lights,Camera and Action Ltd | Information & communication | 2009 |
| Lightyear Logistics Limited | Transport & logistics | 2013 |
| Ligo Electronics Limited | Wholesale & retail | 2003 |
| Like Nana DID Ltd | Wholesale & retail | 2020 |
| Likhat Creations Limited | Wholesale & retail | 2025 |
| Liku Property Limited | Real estate | 2025 |
| LIL Bill Ltd | Arts & recreation | 2022 |
| Lili Gold Pizza Limited | Hospitality | 2024 |
| Lillingtons Ltd | Real estate | 2017 |
| Lilly Clean Limited | Administrative & support | 2020 |
| Lilly's Cafe Limited | Hospitality | 2019 |
| Lillybeth Limited | Professional & scientific | 2018 |
| Lily Tree Bakery Limited | Wholesale & retail | 2022 |
| Lily's Fusion Ltd | Hospitality | 2016 |
| Lilybrew Ltd | Hospitality | 2025 |
| Limbvolume Limited | Wholesale & retail | 2004 |
| Lime Road Tandoori Ltd | Hospitality | 2019 |
| Limequay LLP | | 2012 |
| Limitless Breathwork Detox Ltd | Other services | 2026 |
| Limitless Coatings Ltd | Manufacturing | 2020 |
| Limpid Consultant Ltd | Wholesale & retail | 2026 |
| Linachem Ltd | Health & social care | 2023 |
| Lincoln Healthcare Group Limited | Health & social care | 2003 |
| Lindaquatics Rescue Ltd | Wholesale & retail | 2025 |
| Linden Guest House Ltd | Hospitality | 2012 |