| London ICT Services Ltd | Information & communication | 2021 |
| London Meta Limited | Financial services | 2022 |
| London Nursery Schools Limited | Health & social care | 2014 |
| London Project Construction Contracts Limited | Construction | 2019 |
| London Restaurants (Grey Street) Limited | Real estate | 2012 |
| Lonefoxit Limited | Information & communication | 2012 |
| Lonesome Pine Productions Limited | Information & communication | 2013 |
| Long Rose Engineering Ltd. | Professional & scientific | 2013 |
| Long Tian Ltd | Hospitality | 2021 |
| Longcroft Capital Ltd | Financial services | 2025 |
| Longcroft Consulting Ltd | Financial services | 2026 |
| Longevity Innovation Labs Ltd | Professional & scientific | 2024 |
| Longhirst Management Company Limited | Households | 2016 |
| Longhorsley Village Shop Ltd | Hospitality | 2021 |
| Longpol Asset Management Ltd | Wholesale & retail | 2024 |
| Longreach Ltd | Wholesale & retail | 2020 |
| Longridge Farm and Greendale Park Residents Management Company Limited | Real estate | 2023 |
| Longsands Associates Limited | Professional & scientific | 2020 |
| Longsands Clothing Ltd | Wholesale & retail | 2013 |
| Longsands Custom Campers Ltd | Wholesale & retail | 2025 |
| Longshore and Shoreview Residents Management Company Limited | Real estate | 2022 |
| Longstaff Holdings Limited | Professional & scientific | 2022 |
| Longview Equity Limited | Financial services | 2025 |
| Longwood Homes Limited | Construction | 2024 |
| Lonnen Bakery Ltd | Manufacturing | 2025 |
| Lonnen Mini Market Ltd | Wholesale & retail | 2025 |
| Lookout Farm Steading Limited | Real estate | 2001 |
| Looks Fit Ltd | Wholesale & retail | 2021 |
| Loomi Technologies Limited | Manufacturing | 2017 |
| Loopserv Ltd. | Information & communication | 2018 |
| Loose Logic Events Ltd | Professional & scientific | 2015 |
| Loqum Ltd | Hospitality | 2019 |
| Loraku & Co. Limited | Wholesale & retail | 2025 |
| Lord Property Power Ltd | Construction | 2019 |
| Lord Richard Macleod Ltd | Arts & recreation | 2013 |
| Lord Trillionaire Cruises Ships Ltd | Manufacturing | 2023 |
| Lore Projects Ltd | Real estate | 2025 |
| Loreta Bartkute Beauty Limited | Other services | 2020 |
| Loscoe Chilled Foods Limited | Manufacturing | 1992 |
| Lost and Found Social Ltd | Hospitality | 2018 |
| Lothego Limited | Information & communication | 2023 |
| Lotus Chinese Takeaway Limited | Hospitality | 2006 |
| Loufin Property Limited | Real estate | 2025 |
| Louies HFD Ltd | Hospitality | 2025 |
| Louis Johnson Auctioneers Limited | Wholesale & retail | 2015 |
| Louise Collyer Ltd | Health & social care | 2022 |
| Louise Fice Consultancy Ltd | Professional & scientific | 2025 |
| Lovage Property Ltd | Real estate | 2024 |
| Love & Hate Hair Studio Ltd | Other services | 2024 |
| Love Bars (NE) Limited | Hospitality | 2011 |
| Love Colour Ltd | Construction | 2018 |
| Love Electrics Limited | Construction | 2018 |
| Love Events (NE) Limited | Hospitality | 2016 |
| Love Food Bible North East Community Interest Company | Hospitality | 2022 |
| Love Short Stays Ltd | Hospitality | 2023 |
| Lovedoors Ltd | Wholesale & retail | 2021 |
| Lovefloors Ltd | Administrative & support | 2011 |
| Loveko Properties Limited | Real estate | 2018 |
| Lovely and B Ltd | Transport & logistics | 2010 |
| Loverock Properties Ltd | Construction | 2025 |
| Loverooted Ltd | Wholesale & retail | 2025 |
| Lovie Online Ltd | Wholesale & retail | 2026 |
| Lovinya Court Management Company Limited | Extraterritorial | 2013 |
| LOW Barns Limited | Agriculture & fishing | 2019 |
| LOW Friarside Management Company Limited | Households | 2020 |
| Lowery GAS and Heating Ltd | Construction | 2026 |
| Lowmiles Auto Ltd | Wholesale & retail | 2016 |
| Lowrie Fabrication Ltd | Manufacturing | 2017 |
| Lowrie Foods Holdings Limited | Wholesale & retail | 2015 |
| Lowrie Inspection Ltd | Professional & scientific | 2023 |
| Lows Global Limited | Wholesale & retail | 2014 |
| Lowther Hire Services Limited | Administrative & support | 1983 |
| Loxeal Limited | Extraterritorial | 2010 |
| Loxeal UK Limited | Professional & scientific | 2000 |
| Loxley Maynard Ltd | Information & communication | 2022 |
| Loxxer Ltd | Other services | 2024 |
| LP Grid Limited | Information & communication | 2026 |
| LP North Eight Limited | Wholesale & retail | 2023 |
| LP SD One Hundred Forty SIX Limited | Wholesale & retail | 2023 |
| LPD Construction Ltd | Construction | 2023 |
| LPG Utilities Limited | Other services | 2016 |
| LPH Paddington Limited | Real estate | 2022 |
| Lplt Investments Limited | Real estate | 2023 |
| Lpps Trustee Limited | Financial services | 2019 |
| LR PUB Company Limited | Hospitality | 2017 |
| LR Quay Ltd | Hospitality | 2018 |
| Lrcn Ltd | Other services | 2024 |
| LRD Associates Limited | Professional & scientific | 2018 |
| Lrdl Limited | Administrative & support | 2025 |
| LRG Investments Limited | Financial services | 2025 |
| LRJ Parts Limited | Wholesale & retail | 2018 |
| LRN Distribution Limited | Wholesale & retail | 1999 |
| LRW Plant & Commercial Ltd | Manufacturing | 2021 |
| LS & JS Investment Property Limited | Real estate | 2020 |
| LS Jesmond Lets Limited | Real estate | 2024 |
| LS Properties NE Ltd | Real estate | 2024 |
| LSL Corporate Client Services Limited | Real estate | 2010 |
| LSL GSS Limited | Professional & scientific | 2026 |
| LSL Property Services PLC | Financial services | 2004 |
| Lsli Limited | Financial services | 2006 |