| Lloyd Plumbing & Heating Limited | Construction | 2003 |
| LM Goffin Ltd | Real estate | 2024 |
| LM Groundwork’S & Digger Hire Ltd | Construction | 2024 |
| LMB Electrical Ltd | Construction | 2023 |
| LMB Elite Limited | Real estate | 2025 |
| LMC Pump & Electrical Services Limited | Construction | 2025 |
| Lmcp (Norwich) Ltd | Real estate | 2020 |
| LME Building Services Ltd | Construction | 2020 |
| Lmlm Limited | Professional & scientific | 2020 |
| LMR Heating Services Ltd | Construction | 2019 |
| LMR Scaffolding Limited | Construction | 2019 |
| LMS Truck & Trailer Limited | Administrative & support | 2012 |
| LMW PR Limited | Professional & scientific | 2025 |
| LNG Property Norfolk Limited | Real estate | 2024 |
| LNJ Ltd | Administrative & support | 2022 |
| Lnmh Holdings Ltd | Financial services | 2023 |
| LO Media Ltd | Professional & scientific | 2026 |
| Lo-Jen Ltd | Information & communication | 2006 |
| Lo-Wave Records Limited | Information & communication | 2022 |
| Loaded Ltd | Wholesale & retail | 2024 |
| Loader Heating & GAS Limited | Construction | 2023 |
| LOADS4LESS Limited | Transport & logistics | 2012 |
| Loaf Micro Bakery Ltd | Manufacturing | 2020 |
| Loan Trust Limited | Extraterritorial | 2025 |
| Lobster Copy Ltd | Professional & scientific | 2025 |
| Lobster Docs Limited | Information & communication | 2021 |
| Lobster POT Restaurant Ltd | Hospitality | 2021 |
| Local Art Promo Ltd | Arts & recreation | 2017 |
| Local Emarketing Ltd | Information & communication | 2021 |
| Local Flavours (East Anglia) Limited | Administrative & support | 2021 |
| Local Makers Market Ltd | Administrative & support | 2023 |
| Local Roofing and Cladding Industrial Ltd | Construction | 2017 |
| Local Stories Ltd | Professional & scientific | 2025 |
| Local Voice and Data Ltd | Information & communication | 2017 |
| Localsprint Limited | Financial services | 2000 |
| Locate a Space Ltd | Information & communication | 2025 |
| Loch Lane Developments Limited | Real estate | 2024 |
| Lockdale Coins Ltd | Professional & scientific | 1996 |
| Lockdales Antique Auctions Limited | Professional & scientific | 2011 |
| Locke Lettings and Maintenance Ltd | Real estate | 2018 |
| Lockerquest Limited | Administrative & support | 2023 |
| Lockertek Ltd | Manufacturing | 2011 |
| Lockmasters Mobile (National Accounts) Limited | Professional & scientific | 1995 |
| Lockner Ltd | Professional & scientific | 2017 |
| Lockwood Surveyors Limited | Professional & scientific | 2024 |
| Locomoco Limited | Construction | 2019 |
| Locosteam Limited | Manufacturing | 2004 |
| Locotel Ltd | Information & communication | 2013 |
| Loctis Ltd | Hospitality | 2026 |
| Locumogy Ltd | Health & social care | 2024 |
| Loddon Buildings Preservation Trust | Other services | 1998 |
| Loddon Deli and Coffee Ltd | Hospitality | 2023 |
| Loddon Marina Properties Ltd | Real estate | 2026 |
| Loddon Quay Limited | Households | 2002 |
| Loddon Road Limited | Extraterritorial | 2011 |
| Loddon Storage Limited | Transport & logistics | 2018 |
| Lodge Place Residents Limited | Real estate | 1997 |
| Lodge Roofing Limited | Construction | 1991 |
| Lodge WS Ltd | Professional & scientific | 2022 |
| Lodhy & Co Limited | Information & communication | 2023 |
| Loftbridge Holdings Limited | Agriculture & fishing | 1999 |
| Loftbridge Land and Developments Limited | Construction | 2007 |
| LOG Holdings Ltd | Extraterritorial | 2023 |
| Logburners Ltd | Construction | 2020 |
| Logic Electrical Contractors Limited | Construction | 1974 |
| Logic Electrical Holdings Limited | Construction | 2006 |
| Logic Resource Management Limited | Construction | 1995 |
| Logical Bookkeeping Services Limited | Professional & scientific | 2020 |
| Logical Operations (UK) Ltd | Professional & scientific | 2013 |
| Logie Holdings Ltd | Professional & scientific | 2024 |
| Logie&Co Ltd | Real estate | 2024 |
| Logistic Management Freight Services Ltd | Financial services | 2016 |
| Logistic Management Services Ltd | Professional & scientific | 2008 |
| Logistics & Transport Support Ltd | Professional & scientific | 2025 |
| Logo Station Limited | Manufacturing | 2019 |
| Logowear Limited | Manufacturing | 2001 |
| Lokee Events Limited | Administrative & support | 2016 |
| Lokilly Properties Limited | Construction | 2023 |
| Lomax Builders Ltd | Construction | 2012 |
| Lomax Elite Living Limited | Real estate | 2025 |
| Lomax Enterprise Consultants Limited | Information & communication | 2019 |
| Lomax Family Swim School LLP | | 2019 |
| Lomax Homes Limited | Construction | 1978 |
| Lomax Properties Limited | Real estate | 2015 |
| Lomax Rentals Ltd | Real estate | 2019 |
| Lomax Technical Services Limited | Administrative & support | 1997 |
| Loncraine Grips Ltd | Information & communication | 2025 |
| Loncraine Limited | Information & communication | 2000 |
| London Build Contractors Ltd | Construction | 2019 |
| London Business Boost Ltd | Administrative & support | 2025 |
| London Chamber Opera Limited | Professional & scientific | 2012 |
| London Diary Limited | Arts & recreation | 2001 |
| London Historic Buildings Trust Ltd | Real estate | 1992 |
| London House Entertainment Ltd | Extraterritorial | 2020 |
| London Lift Alliance Ltd | Professional & scientific | 2021 |
| London Mode Ltd | Other services | 2018 |
| London Norwich Spine Clinic Ltd | Construction | 2003 |
| London PAY Ltd | Administrative & support | 2014 |
| London Port & Logistics Consulting Ltd | Wholesale & retail | 2021 |
| London Reclaimed | Manufacturing | 2011 |