| LNX Groundworks Ltd | Construction | 2024 |
| Loaded Butter Limited | Manufacturing | 2024 |
| Loaded Cannon Limited | Construction | 2013 |
| Local Expert Services Limited | Extraterritorial | 2009 |
| Local Hospice Lottery Ltd | Arts & recreation | 1996 |
| Local Tenders Limited | Information & communication | 2025 |
| Locate 369 Ltd | Real estate | 2026 |
| Location Property Limited | Real estate | 2007 |
| Locker & Riley (Fibrous Plastering) Limited | Manufacturing | 1992 |
| Locker & Riley (Heritage) Limited | Manufacturing | 2015 |
| Locker & Riley (Mouldings) Limited | Construction | 1998 |
| Locker 9 Live Limited | Administrative & support | 2026 |
| Locker Room VC Group Ltd | Information & communication | 2025 |
| Lockhill Properties Limited | Construction | 1998 |
| Locks & Leaks 24 Limited | Construction | 2010 |
| Locksmith Alliance Ltd | Administrative & support | 2024 |
| Lockton Maintenance Ltd | Administrative & support | 2024 |
| Locomotive Events Ltd | Arts & recreation | 2021 |
| Lodge House Dental Ltd | Health & social care | 2012 |
| Lodge Intelligence Ltd | Hospitality | 2019 |
| Logbookly Limited | Information & communication | 2024 |
| Logic BMS Solutions Ltd | Professional & scientific | 2018 |
| Logical Compliance Limited | Professional & scientific | 2021 |
| Logicool Ltd | Construction | 2009 |
| Logistics Compliance Consultants Ltd | Professional & scientific | 2016 |
| Logo Embroidery Ltd | Manufacturing | 2022 |
| Logre Solutions Ltd | Information & communication | 2026 |
| Lomand Services Ltd | Financial services | 2017 |
| Lomas Pigeon & Company Limited | Manufacturing | 1991 |
| Lomax Medical Limited | Manufacturing | 2023 |
| London & Country Property Leasing Company Ltd | Financial services | 1999 |
| London Capital Developments 3 Limited | Construction | 2011 |
| London Centre for Risk & Sustainability Limited | Professional & scientific | 2026 |
| London Day Camps Limited | Extraterritorial | 2011 |
| London Elite Plumbing Limited | Construction | 2026 |
| London Fibre & Data Limited | Information & communication | 2026 |
| London Lima Holdings Limited | Real estate | 2019 |
| London Lima Services Ltd | Construction | 2016 |
| London Locks Ltd | Manufacturing | 2012 |
| London Media Press Ltd | Professional & scientific | 2001 |
| London Muthamil Academy Ltd | Education | 2022 |
| London Pet Cremations Ltd | Other services | 2020 |
| London Retro Footwear Ltd | Manufacturing | 2023 |
| London Road Building Developments Ltd | Other services | 2021 |
| London Stitches Limited | Other services | 2024 |
| London Washrooms Limited | Construction | 2023 |
| London Zone Vehicles Ltd | Wholesale & retail | 2019 |
| Londonim Limited | Professional & scientific | 2024 |
| Londonrad Ltd | Health & social care | 2025 |
| Longevity Consulting Limited | Financial services | 2016 |
| Longley Ventures Ltd | Financial services | 2021 |
| Longs ABC C.I.C. | Education | 2023 |
| Longstream Limited | Wholesale & retail | 2004 |
| Longterm Lettings Ltd | Real estate | 2023 |
| Longwave Commercials Ltd | Transport & logistics | 2020 |
| Lonsdale Financial Solutions Ltd | Professional & scientific | 2020 |
| Loop Creative Limited | Professional & scientific | 2012 |
| Loop Marketplace Ltd | Wholesale & retail | 2024 |
| Lord Interior Design Ltd | Professional & scientific | 2024 |
| Lord Rayleigh's Farms Limited | Agriculture & fishing | 1930 |
| Lordam CIC | Health & social care | 2023 |
| Lordam Support Services Ltd | Administrative & support | 2021 |
| Loriena Limited | Extraterritorial | 2012 |
| Lorise Trading Limited | Construction | 2025 |
| Losc Developments Ltd | Real estate | 2023 |
| Losich Ltd | Wholesale & retail | 2019 |
| Lost and Found Animation Limited | Information & communication | 2016 |
| LOT 33 Pizza Limited | Hospitality | 2021 |
| Lotlands Limited | Real estate | 2017 |
| Lotus Advisory Solutions Ltd | Professional & scientific | 2025 |
| Lotus Chelmsford Limited | Hospitality | 2016 |
| Loubuc Limited | Real estate | 2009 |
| Louci Limited | Hospitality | 2023 |
| Louex Limited | Real estate | 2017 |
| Loughton SBC NO 2 Limited | Extraterritorial | 2018 |
| Loughton SBC NO 3 Limited | Extraterritorial | 2018 |
| Loughton SBC NO 4 Limited | Extraterritorial | 2018 |
| Loughton SBC NO 5 Limited | Extraterritorial | 2018 |
| Louise Digby Nutrition Ltd | Health & social care | 2020 |
| Lounge 1453 Ltd | Hospitality | 2024 |
| Louvain House Limited | Wholesale & retail | 2019 |
| Lovari Ltd | Wholesale & retail | 2021 |
| Love Clean Homes Limited | Administrative & support | 2023 |
| Love Clean Ltd | Administrative & support | 2014 |
| Love Rfid Limited | Professional & scientific | 2020 |
| Love, LIZ Ltd | Households | 2021 |
| Love, Wildly Ltd | Wholesale & retail | 2024 |
| Lovely Tailors Ltd | Manufacturing | 2019 |
| Loving CUP Limited | Households | 2019 |
| LOW Down Deep Events Ltd | Arts & recreation | 2016 |
| LOW Down Deep Recordings Ltd | Information & communication | 2016 |
| LOW Waters Consulting Ltd | Professional & scientific | 2024 |
| Lowe Property Care Limited | Construction | 2023 |
| Lowe Vehicle Care Ltd | Wholesale & retail | 2025 |
| Lowe's of London Limited | Construction | 2024 |
| Lowleys Limited | Agriculture & fishing | 2013 |
| Lowrie Support Services Limited | Administrative & support | 2017 |
| LOX Enterprises Ltd | Financial services | 2026 |
| Loxley Planning Ltd | Professional & scientific | 2025 |
| Loyaltyview Limited | Information & communication | 2022 |