| Lainston Dunkeswell Limited | Real estate | 2020 |
| Lainston Dutchman Limited | Real estate | 2018 |
| Lainston Estates Limited | Real estate | 2006 |
| Lainston High Street LLP | | 2012 |
| Lainston Holdings Limited | Financial services | 2018 |
| Lainston Investments Limited | Financial services | 2020 |
| Lainston Limited | Construction | 2006 |
| Lainston Lupa LLP | | 2015 |
| Lainston Property (2023) Limited | Real estate | 2023 |
| Lainston Property Limited | Real estate | 2023 |
| Lainston RE Limited | Real estate | 2026 |
| Lainston Securities Limited | Real estate | 2014 |
| Lainston Services Limited | Professional & scientific | 2018 |
| Lainston Woodley Arms LLP | | 2013 |
| Lakes Edge Refurbs Ltd | Manufacturing | 2024 |
| Lakeside Planning Services Ltd | Professional & scientific | 2018 |
| Lakewood Beauty Studios Ltd | Other services | 2021 |
| Lakewood Financial Services Limited | Financial services | 2008 |
| Lala Salama Limited | Wholesale & retail | 2020 |
| Lally Rentals Ltd | Real estate | 2011 |
| Lama Express UK Limited | Real estate | 2022 |
| Lamanth Ltd | Real estate | 2021 |
| Lambda Communications Ltd | Information & communication | 2012 |
| Lambda International Services Ukeig | | 2008 |
| Lambda Solutions Ltd | Information & communication | 2014 |
| Lamber Housing Association CIC | Administrative & support | 2018 |
| Lambert D Limited | Construction | 2016 |
| Lambertlux Electrical Solutions Limited | Construction | 2022 |
| Lambeth Walk Limited | Real estate | 2026 |
| Lambeth Yachts Ltd | Administrative & support | 2024 |
| Lamdata Ltd | Information & communication | 2025 |
| Lamerton Creative Ltd | Professional & scientific | 2014 |
| Lamora Pictures Limited | Professional & scientific | 2011 |
| LAN Care Ltd | Health & social care | 2021 |
| Lanca Holdings Limited | Financial services | 2025 |
| Lancaster House RTM Company Limited | Households | 2017 |
| Lancaster Landscape Limited | Construction | 2014 |
| Lancraft Events Ltd | Arts & recreation | 2024 |
| Land & Sea Trading Ltd | Wholesale & retail | 2024 |
| Land and Property Solutions (Southern) Limited | Construction | 2014 |
| Land at the Dene (Ropley) Limited | Construction | 2026 |
| Land for New Homes Limited | Real estate | 2017 |
| Land Products LLP | | 2002 |
| Land Trading Company (Portagaria) Limited | Extraterritorial | 2013 |
| LAND4 Ltd | Real estate | 2023 |
| Landa and Singh Recruitment Limited | Administrative & support | 2024 |
| Landco Ventures 2 Limited | Real estate | 2026 |
| Landco Ventures Limited | Financial services | 2026 |
| Landford (New Homes) Limited | Construction | 1990 |
| Landford Bloodstock Limited | Agriculture & fishing | 2013 |
| Landford Car Centre Limited | Wholesale & retail | 2018 |
| Landford Estates Limited | Real estate | 1992 |
| Landford Investments Limited | Financial services | 2017 |
| Landguard Property Investments PLC | Professional & scientific | 1971 |
| Landguard Residents Association Limited | Households | 1989 |
| Landing Place Limited | Real estate | 1997 |
| Landmark Estates ( Crossways ) Limited | Construction | 2018 |
| Landmark Estates ( HO ) Limited | Construction | 2019 |
| Landmark Estates (Little Place) Limited | Construction | 2019 |
| Landmark Estates (Thatcham) Limited | Construction | 2016 |
| Landmark Living Ltd | Real estate | 2022 |
| Landmark Rabbit Control Limited | Agriculture & fishing | 2014 |
| Landmark Rabbit, Deer & Wildlife Control Ltd | Agriculture & fishing | 2021 |
| Landregis Limited | Real estate | 1978 |
| Landris Property Services Limited | Construction | 2010 |
| Landscaping for YOU Ltd | Administrative & support | 2025 |
| Lane Enterprises Ltd | Wholesale & retail | 2023 |
| Lane Plumbing and Heating Limited | Construction | 2014 |
| Lane Willis Commercial Storage Limited | Administrative & support | 2015 |
| Lane Willis Self Storage Limited | Administrative & support | 2015 |
| Laneasia Trading Limited | Hospitality | 2025 |
| Lanes Recovery Limited | Wholesale & retail | 2018 |
| Langavi Pro Ltd | Wholesale & retail | 2025 |
| Langbridge Rentals Limited | Real estate | 2019 |
| Langley Tavern (New Forest) Limited | Hospitality | 2009 |
| Langridge Financial Solutions Limited | Financial services | 2023 |
| Langs Automotive Limited | Wholesale & retail | 2022 |
| Langston Developments Ltd | Construction | 2016 |
| Langton Properties Limited | Extraterritorial | 2006 |
| Language Period Co., Ltd | Wholesale & retail | 2023 |
| Lankester and SON Limited | Real estate | 1889 |
| Lankford Properties Limited | Real estate | 2019 |
| Lansa U.K. Limited | Manufacturing | 1981 |
| Lansdowne Court (Winchester) Limited | Households | 2018 |
| Lansdowne Court Property Management Company Limited | Real estate | 1999 |
| Lansdowne Park G Management Company Limited | Households | 2001 |
| Lansdowne Road Southampton Management Company Limited | Professional & scientific | 2008 |
| Lansvault Limited | Professional & scientific | 2024 |
| Lantis Holdings Limited | Financial services | 2022 |
| Lantis L102 Ltd | Real estate | 2022 |
| Lantis Limited | Construction | 2022 |
| Lanzhou Noodles Limited | Hospitality | 2021 |
| LAP After LAP Apparel Ltd | Wholesale & retail | 2025 |
| Laphen Services Ltd | Wholesale & retail | 2015 |
| Lapis Health and Events Limited | Health & social care | 2012 |
| Lara-May Limited | Wholesale & retail | 2019 |
| Larchstar Limited | Hospitality | 1996 |
| Larchstar Properties Limited | Real estate | 2016 |
| Larchwood Property Ltd | Construction | 2016 |
| Lard Properties Ltd | Real estate | 2015 |