| Lights and Echoes Limited | Health & social care | 2024 |
| Like Feather Ltd | Administrative & support | 2025 |
| Lila Hair & Beauty Ltd | Other services | 2026 |
| Lila Pleban Ltd | Professional & scientific | 2024 |
| Lilaselim Limited | Real estate | 2024 |
| Lilla Properties Limited | Real estate | 2024 |
| Lilly Industries Limited | Manufacturing | 1963 |
| Lilly Research Centre Limited | Manufacturing | 1963 |
| Lily Lane Cosmetics & Home Ltd | Wholesale & retail | 2025 |
| Lilylow Limited | Hospitality | 2025 |
| Lime Tree Gate Limited | Real estate | 2014 |
| Limitless Beauty Ltd | Other services | 2023 |
| LINAS2 Ltd | Wholesale & retail | 2017 |
| Lincoln Enterprises Ltd | Hospitality | 2023 |
| Linden Homes Westinghouse LLP | | 2010 |
| Linden Sovereign Brockworth LLP | | 2018 |
| Linding Property Group Ltd | Real estate | 2021 |
| Link Cars Basingstoke Ltd | Transport & logistics | 2026 |
| Link Microtek Holdings Limited | Financial services | 2026 |
| Link Microtek Limited | Manufacturing | 1995 |
| Link Security Services Ltd | Wholesale & retail | 2024 |
| Linked Build Ltd | Professional & scientific | 2025 |
| Lionfish Media Ltd | Professional & scientific | 2010 |
| Lite and Cool Ltd | Wholesale & retail | 2025 |
| Lithium Energy Ltd | Extraterritorial | 2016 |
| Little Barn Health Ltd | Wholesale & retail | 2024 |
| Little BOO Learning Ltd | Wholesale & retail | 2019 |
| Little Ducklings Pre-School Basingstoke | Education | 2011 |
| Little Eden Vision Studio Ltd | Professional & scientific | 2025 |
| Little Kitchen Social Ltd | Hospitality | 2019 |
| Little Miss Bookkeeper Limited | Professional & scientific | 2015 |
| Little Orchard Live Ltd | Professional & scientific | 2024 |
| Little Words (Speech and Language Therapy) Ltd | Health & social care | 2023 |
| LIV Platforms Ltd | Information & communication | 2023 |
| Livingspring Global Ltd | Education | 2018 |
| Lizard Racing Limited | Wholesale & retail | 2011 |
| LJ Rabbit Ltd | Construction | 2016 |
| LJB Support Ltd | Administrative & support | 2023 |
| LJS Administration Services Limited | Administrative & support | 2019 |
| LJS GAS and Heating Limited | Construction | 2018 |
| LM Groundworks Ltd | Construction | 2024 |
| Lmentry Ltd | Professional & scientific | 2022 |
| LMF Solutions Limited | Administrative & support | 2015 |
| Lmpp Holdings Limited | Financial services | 2023 |
| LMW Limited | Professional & scientific | 2007 |
| LNS Recruitment Limited | Administrative & support | 2013 |
| LNT Design Services Ltd | Information & communication | 2017 |
| Loam Gardens Limited | Administrative & support | 2018 |
| Lock & Go Limited | Professional & scientific | 2015 |
| Lock One UK Limited | Real estate | 2018 |
| Lockerbox Storage Ltd | Real estate | 2017 |
| Lockey Farm Limited | Agriculture & fishing | 2010 |
| Locom Courier Services Limited | Transport & logistics | 2009 |
| Lodage Properties Limited | Real estate | 1993 |
| Loddon Accountancy Services Ltd | Professional & scientific | 2021 |
| Loddon Estates Limited | Real estate | 2009 |
| Loddon Investment Group Limited | Real estate | 2018 |
| Loddon Ridge Management Limited | Households | 2004 |
| Lodge Farm Stud Limited | Agriculture & fishing | 2016 |
| Lodge Nine Limited | Arts & recreation | 2017 |
| Loftplan Designs Limited | Construction | 1998 |
| Loftplan Ltd | Construction | 2009 |
| Logical and Ltd | Information & communication | 2025 |
| Lolly's Daycare Ltd | Health & social care | 2020 |
| Lollyconn Ltd | Wholesale & retail | 2017 |
| Lombard Associates Ltd | Financial services | 2010 |
| London 57 Ltd | Hospitality | 2024 |
| London Careers Advice Limited | Other services | 2017 |
| London Clancy Property Consultants Limited | Real estate | 2000 |
| London Collectibles Limited | Wholesale & retail | 2016 |
| London Local Fleet Limited | Administrative & support | 2024 |
| London Market Capital Strategies Ltd | Professional & scientific | 2020 |
| London Street Limited | Hospitality | 2007 |
| Long Buftlers Ltd | Real estate | 2025 |
| Longacre Claims Limited | Financial services | 2015 |
| Longdog Brewery Limited | Manufacturing | 2011 |
| Longfellow Property Limited | Administrative & support | 2017 |
| Look Both Ways Media Limited | Information & communication | 2023 |
| Look What Hive Made Ltd | Manufacturing | 2024 |
| Lord's Software Solutions Ltd | Information & communication | 2019 |
| Lorfae International Ltd | Manufacturing | 2025 |
| Lost BOY Cosmetics Ltd | Wholesale & retail | 2024 |
| Lost Lake FLY Ltd | Agriculture & fishing | 2020 |
| Lost Soul Tattoos Ltd | Arts & recreation | 2019 |
| Lotus London Limited | Manufacturing | 2002 |
| LOU Trans Ltd | Transport & logistics | 2025 |
| Lounge PAD Ltd | Arts & recreation | 2025 |
| Love Beer Bars Ltd | Wholesale & retail | 2017 |
| Love Property Consulting Ltd | Real estate | 2020 |
| Love UK Products Ltd | Wholesale & retail | 2015 |
| Love Ventures VC Limited | Financial services | 2020 |
| Lovelock Events Ltd | Other services | 2016 |
| LOW Fell Productions Ltd | Information & communication | 2024 |
| LR3 Consulting Ltd | Information & communication | 2023 |
| LRB Home Improvements Ltd | Wholesale & retail | 2014 |
| LS Autos Ltd | Wholesale & retail | 2019 |
| LS Brickwork Ltd | Construction | 2021 |
| LS Media and Marketing Limited | Professional & scientific | 2021 |
| LS Setty Limited | Real estate | 2023 |
| LSE Transport Ltd | Transport & logistics | 2025 |