| Linden Management Services Limited | Real estate | 2020 |
| Linden Property Management Limited | Financial services | 2023 |
| Lindenhof Holdings Ltd | Administrative & support | 1999 |
| Lindisfarne 8 Limited | Financial services | 2023 |
| Lindisfarne Inns Limited | Hospitality | 2006 |
| Lindisfarne View Ltd | Hospitality | 2024 |
| Lindsay Brothers (Fish Products)Limited | Wholesale & retail | 1959 |
| Linen & Latch Ltd | Real estate | 2025 |
| Lines Behind the Lines Ltd | Wholesale & retail | 2026 |
| Linfield Court Management Company Limited | Real estate | 2004 |
| Lingeyfine Ltd | Transport & logistics | 2020 |
| Lingscars.Com Limited | Wholesale & retail | 2007 |
| Lingua JAM Limited | Education | 2023 |
| Link MEP Consulting Engineers Ltd | Professional & scientific | 2019 |
| Link Solution Marketing and Consultancy Limited | Education | 2026 |
| Link Solutions Healthtech Consultancy Services Limited | Information & communication | 2025 |
| Link'D Transport Ltd | Transport & logistics | 2018 |
| Linkpublish Limited | Wholesale & retail | 2025 |
| Linktop Property Management Limited | Professional & scientific | 1989 |
| Linky Property Ltd | Real estate | 2025 |
| Linnel Homes Limited | Construction | 2021 |
| Linscott & Sutherland Holdings Limited | Real estate | 2024 |
| Linsley Group Ltd | Administrative & support | 2023 |
| Lintel Law Limited | Professional & scientific | 2026 |
| Linton Gray Ltd | Construction | 2017 |
| Lintone Audio Limited | Wholesale & retail | 1974 |
| Lintz Cricket Club Limited | Arts & recreation | 2016 |
| Lintz Green Farms Limited | Agriculture & fishing | 1976 |
| Lintz Hall Farm Limited | Wholesale & retail | 1975 |
| Lintz Hall Farm Properties Limited | Real estate | 2016 |
| Linx Reviews Limited | Information & communication | 2023 |
| Lion & Mouse Ltd | Professional & scientific | 2026 |
| Lion and Lilac | Arts & recreation | 2021 |
| Lion Court (Corbridge) Limited | Real estate | 2003 |
| Lion Sun Ltd | Administrative & support | 2026 |
| Lion&Lamb@Horsley Ltd | Hospitality | 2025 |
| Lionbear Ltd | Financial services | 2023 |
| Lionel Cooke Memorial Fund Limited(The) | Other services | 1956 |
| Liosi's Heaton Ltd | Wholesale & retail | 2024 |
| Liravas Ltd | Wholesale & retail | 2026 |
| Lisa Jones Hair and Make UP Limited | Other services | 2018 |
| Lisa Nails 169 Ltd | Other services | 2023 |
| Lisa Williams Global Ltd | Health & social care | 2018 |
| Lisam Systems Ltd | Information & communication | 2012 |
| Lisarb Energy Group Limited | Financial services | 2017 |
| Lisette Limited | Information & communication | 2021 |
| Lisle 28 Limited | Hospitality | 2025 |
| Lisoo Ltd | Wholesale & retail | 2024 |
| Lissoms ERA Ltd | Wholesale & retail | 2021 |
| Lister House (Fife) Limited | Health & social care | 2006 |
| Lister Structural Limited | Professional & scientific | 2007 |
| Lita Ltd | Wholesale & retail | 2025 |
| Litegrey Limited | Professional & scientific | 2016 |
| Literal Labs Ltd | Information & communication | 2023 |
| Liteshade Ltd | Real estate | 2020 |
| Litewhite Limited | Professional & scientific | 2002 |
| Litig Limited | Administrative & support | 2005 |
| Litrose Investments Limited | Construction | 1967 |
| Little Bears Chapel House Ltd | Health & social care | 2016 |
| Little Bears Children's Day Nursery Ltd | Health & social care | 2015 |
| Little Bears Trevelyan Drive Limited | Health & social care | 2022 |
| Little Bees Soft Play Ltd | Arts & recreation | 2021 |
| Little Big Mouth Theatre Community Interest Company | Arts & recreation | 2011 |
| Little Buildings Bookings Ltd | Hospitality | 2023 |
| Little Buildings Live Limited | Arts & recreation | 2017 |
| Little Cinders Ltd | Administrative & support | 2024 |
| Little Connies Kitchen Limited | Hospitality | 2022 |
| Little Geordies Play Cafe Ltd | Hospitality | 2025 |
| Little Green Otter Limited | Information & communication | 2020 |
| Little Haven Play Cafe Ltd | Hospitality | 2026 |
| Little Honey Badger CIC | Education | 2026 |
| Little Hotties Limited | Other services | 2020 |
| Little Istanbul (Newcastle) Ltd | Hospitality | 2023 |
| Little Learners (NE) Community Interest Company | Education | 2013 |
| Little Matters Limited | Education | 2025 |
| Little Moor Allotments Ltd | Agriculture & fishing | 2023 |
| Little Movers Ltd | Administrative & support | 2020 |
| Little Rascals Childcare Ltd | Health & social care | 2021 |
| Little Rascal’S Childcare & Co. Ltd | Health & social care | 2025 |
| Little Rose Beauty Limited | Manufacturing | 2025 |
| Little Seeds Playgroup and Preschool Ltd | Education | 2023 |
| Little SHE (Newcastle) Limited | Other services | 2003 |
| Little Spoon Stay & Play Cafe Ltd | Arts & recreation | 2026 |
| Little Tots Academy Ltd | Health & social care | 2015 |
| Little Wolf Extraordinary Gift Emporium Ltd | Wholesale & retail | 2021 |
| Littleforge Studio Ltd | Manufacturing | 2025 |
| Littlejem Workshop Ltd | Arts & recreation | 2024 |
| Littlemobster Limited | Manufacturing | 2025 |
| Littlewoodwalkers Ltd | Arts & recreation | 2021 |
| LIU Developments Limited | Administrative & support | 2008 |
| LIV Keystone (NE) Limited | Real estate | 2018 |
| Live North Limited | Real estate | 2006 |
| Live Trading Limited | Arts & recreation | 1995 |
| Live Well Learn Well Community Interest Company | Education | 2020 |
| Live Wild Group Ltd | Wholesale & retail | 2025 |
| Lived Informatics Ltd | Information & communication | 2022 |
| Livehere Limited | Real estate | 2003 |
| Livehere Property (North East) Limited | Real estate | 2018 |
| Livehereproperty Ltd | Administrative & support | 2013 |
| Liveworks (Newcastle Upon Tyne) Ltd | Arts & recreation | 2014 |