| Likeskin Retail Limited | Wholesale & retail | 2023 |
| Lila Intelligence Ltd | Information & communication | 2026 |
| Lilac Feathers Ltd | Administrative & support | 2026 |
| Lillington Consultancy Ltd | Professional & scientific | 2000 |
| Lillybrook Estate Limited | Real estate | 1987 |
| Lima Process Solutions Ltd | Administrative & support | 2021 |
| Limbrick and Sons Limited | Construction | 2007 |
| Limi Brothers Limited | Real estate | 2017 |
| Limitless (South West) Ltd | Construction | 2022 |
| Limitless Car Sales UK Ltd | Wholesale & retail | 2025 |
| Linc Capital Limited | Financial services | 2016 |
| Lincoln GAS Limited | Construction | 2014 |
| Lindsay and Butcher Ltd | Construction | 2000 |
| Line Asset Management Limited | Information & communication | 2012 |
| Lines of Connection CIC | Arts & recreation | 2025 |
| Lingua Nativoo Ltd | Wholesale & retail | 2025 |
| Link Airport Transfer Ltd | Transport & logistics | 2015 |
| Link LES Logistics Limited | Transport & logistics | 2012 |
| Link Travel Transport LLP | | 2023 |
| Link-Net Ltd | Transport & logistics | 2015 |
| Linkin Ltd | Professional & scientific | 2015 |
| Linnaea Inns Limited | Hospitality | 2010 |
| Linnaea Limited | Information & communication | 2016 |
| Linnaea Solutions Limited | Information & communication | 2010 |
| Linroc Limited | Construction | 2014 |
| Lion Motorcycles Limited | Wholesale & retail | 2023 |
| Lion Textile Consultancy Limited | Professional & scientific | 2021 |
| Lionheart Grand Limited | Hospitality | 2026 |
| Lion’S DEN Property and Services Ltd | Real estate | 2016 |
| Lipton Development Limited | Construction | 2017 |
| Liquid Media Live Events Limited | Administrative & support | 2016 |
| Liquidus Engineering Ltd | Manufacturing | 2020 |
| Lisa Williams Music Limited | Education | 2020 |
| Listed Roofing Ltd | Construction | 2021 |
| LIT and Co Lighting Ltd | Manufacturing | 2019 |
| LIT Enduro Ltd | Wholesale & retail | 2025 |
| Litebulb Limited | Information & communication | 2025 |
| Litore Ltd | Financial services | 2021 |
| Littelfuse Limited | Manufacturing | 1967 |
| Litten Number 3 Limited | Households | 2015 |
| Littens Management (Number Two) Limited | Households | 1995 |
| Little Bosses Academy CIC | Hospitality | 2025 |
| Little Canton Ltd | Real estate | 2017 |
| Little Centurions Limited | Hospitality | 2022 |
| Little Cheyne Court Wind Farm Limited | Energy | 2005 |
| Little Colva Markwil Ltd | Hospitality | 2022 |
| Little Colva Waters Singham Ltd | Hospitality | 2025 |
| Little Gems PRE School Swindon Ltd | Education | 2014 |
| Little Grazey Limited | Hospitality | 2024 |
| Little Hands Care Ltd | Health & social care | 2018 |
| Little JEM Developments Ltd | Administrative & support | 2017 |
| Little Moonbeam Sleep Ltd | Other services | 2025 |
| Little More Peter Ltd | Hospitality | 2026 |
| Little Pick Bakery Limited | Manufacturing | 2026 |
| Little X Ltd | Education | 2023 |
| Littlemoat Care Ltd | Health & social care | 2021 |
| LIU Enterprises Limited | Real estate | 2002 |
| Liuks Property Ltd | Real estate | 2025 |
| LIV D'Avanzo Services Ltd | Health & social care | 2014 |
| Live & Learn UK Limited | Education | 2006 |
| Live Fit Outs Ltd | Construction | 2016 |
| Live Fuel Ltd | Other services | 2024 |
| Liveable Properties Limited | Real estate | 2022 |
| Livebirth Limited | Health & social care | 2022 |
| Livermann Ltd | Real estate | 2021 |
| Living Homes Properties Ltd | Construction | 2026 |
| Livingstone UK Estates Ltd | Construction | 2026 |
| Livon Productions Ltd | Information & communication | 2007 |
| Livs Group Ltd | Hospitality | 2025 |
| Liyanna Ltd | Manufacturing | 2025 |
| Lizard Logistics Ltd | Transport & logistics | 2023 |
| Lizzy Bakes HQ Ltd | Hospitality | 2023 |
| LJ Clothing Company Ltd | Wholesale & retail | 2024 |
| LJ SEN Advocacy Services Ltd | Professional & scientific | 2026 |
| LJB Ceilings and Walls Ltd | Construction | 2020 |
| LJB Interiors Ltd | Construction | 2014 |
| LJC Solutions Limited | Information & communication | 2010 |
| Ljld Holdings Limited | Transport & logistics | 2018 |
| LJS Design Ltd | Information & communication | 2023 |
| LK Studio Ltd | Other services | 2014 |
| Lkfba Ltd | Wholesale & retail | 2025 |
| LKM Transport Limited | Transport & logistics | 2014 |
| Lkms Holdings Limited | Financial services | 2018 |
| LKP Contractors Ltd | Administrative & support | 2025 |
| Lkra Ltd | Wholesale & retail | 2025 |
| LL Care Limited | Health & social care | 2013 |
| LM Groundworks and Building Services Ltd. | Construction | 2017 |
| LM Properties Swindon Ltd | Real estate | 2016 |
| Lmasi Properties Ltd | Real estate | 2024 |
| LMB Swindon Limited | Health & social care | 2025 |
| LMF Developments Ltd | Real estate | 2024 |
| LMP Management Services Limited | Professional & scientific | 2017 |
| Lmsf Limited | Administrative & support | 2016 |
| Lnrm Limited | Wholesale & retail | 2023 |
| Loaded Spirits Ltd | Manufacturing | 2018 |
| Loadpoint Limited | Manufacturing | 2010 |
| Loaf Cameras Ltd | Wholesale & retail | 2019 |
| Local Heroes Ltd | Health & social care | 2021 |
| Location Two Location Ltd | Construction | 2018 |
| Location VIP EST. Ltd | Wholesale & retail | 2018 |