| Lifesprings Homes Ltd | Real estate | 2024 |
| Lifestyles Investments Ltd | Real estate | 2025 |
| Lifetime Homes (Warrington) Limited | Real estate | 2014 |
| Lifeways Community Care Limited | Health & social care | 2000 |
| Lifeways Finance Limited | Professional & scientific | 2007 |
| Lifeways Holdings Limited | Professional & scientific | 2007 |
| Lifeways Inclusive Lifestyles Limited | Health & social care | 2003 |
| Lifeways Independent Living Alliance Limited | Health & social care | 2000 |
| Lifeways ISS Limited | Administrative & support | 2001 |
| Lifeways Natural Networks Limited | Health & social care | 2004 |
| Lifeways Orchard Care Limited | Health & social care | 2000 |
| Lifeways Paragon Limited | Health & social care | 2001 |
| Lifeways Raglin Limited | Health & social care | 1992 |
| Lifeways Rose Care and Support Limited | Health & social care | 2006 |
| Lifeways SIL Limited | Health & social care | 2008 |
| Lifeways Support Options Limited | Health & social care | 2005 |
| Liffey Consulting Ltd | Administrative & support | 2022 |
| Liftedby Consulting Limited | Administrative & support | 2025 |
| Liftmill Limited | Wholesale & retail | 2005 |
| Lig-Safe Ltd | Wholesale & retail | 2009 |
| Light Guiding Systems Technology Ltd | Information & communication | 2023 |
| Light Speed Consulting Limited | Administrative & support | 2020 |
| Lightbay Consultancy Limited | Administrative & support | 2022 |
| Lightning Tenders Limited | Administrative & support | 2024 |
| Lightweight Conservatory Roofing Ltd | Construction | 2019 |
| Lightzzz OUT Ltd | Health & social care | 2023 |
| Lignum Permanent Recruitment Limited | Administrative & support | 2020 |
| Lignum Recruitment Limited | Administrative & support | 2015 |
| LIL Legacy Ltd | Wholesale & retail | 2021 |
| Lilac Projects Limited | Other services | 2018 |
| Lilac Tree Properties Limited | Construction | 2026 |
| Lilax Limited | Wholesale & retail | 2024 |
| Lilian Architectural Services Limited | Administrative & support | 2016 |
| Lilian Pochin Ltd | Professional & scientific | 2024 |
| Lilley Consulting Limited | Administrative & support | 2024 |
| Lilley Rose Ltd | Administrative & support | 2024 |
| Lilly Care Ltd | Health & social care | 2015 |
| Lillypond Consulting Ltd | Administrative & support | 2015 |
| Lilt Technologies Ltd | Information & communication | 2021 |
| Liltdown Limited | Construction | 1983 |
| Lilybank Consulting Limited | Administrative & support | 2025 |
| Lilydec Logistics Limited | Transport & logistics | 2025 |
| Lilygold Property Ltd | Households | 2024 |
| Lilywhite Accounting Solutions Limited | Professional & scientific | 2021 |
| Lima Food Limited | Hospitality | 2025 |
| Lima Forest Limited | Transport & logistics | 2016 |
| Liman Consulting Limited | Administrative & support | 2025 |
| Limberts Transport Services Limited | Transport & logistics | 1982 |
| Lime Kilns Energy Centre Ltd | Energy | 2018 |
| Lime Pine Limited | Administrative & support | 2007 |
| Lime Tree Garden Services Ltd | Administrative & support | 2024 |
| Lime Tree Landscaping Ltd | Administrative & support | 2023 |
| Limestone Books Limited | Wholesale & retail | 2025 |
| Limetree Windows Limited | Construction | 2019 |
| Limina Clinical Pharmacology Limited | Professional & scientific | 2022 |
| Limitless Goddesses Ltd | Other services | 2020 |
| Linc IT Consulting Ltd | Administrative & support | 2014 |
| Linda Vida Limited | Manufacturing | 2026 |
| Linden Financial Ltd | Financial services | 2023 |
| Lindley Group Capital Holdings Limited | Financial services | 2025 |
| Lindley Group Holdings Limited | Financial services | 2021 |
| Lindley Group Limited | Financial services | 2001 |
| Lindley Outside Catering Ltd | Hospitality | 2017 |
| Line Level Studios Ltd | Information & communication | 2025 |
| Line Telecom Ltd | Information & communication | 2017 |
| Linea Nataly Limited | Other services | 2009 |
| Linear B Data Science Limited | Information & communication | 2024 |
| Linear Energy Limited | Manufacturing | 2013 |
| Linear Standard Limited | Administrative & support | 2010 |
| Linen and Letters Ltd | Arts & recreation | 2020 |
| Lines Consultancy Services Ltd | Administrative & support | 2022 |
| Linespeed Ltd | Administrative & support | 2020 |
| Lingley Court Limited | Hospitality | 2012 |
| Lingmoor Estates Ltd | Real estate | 2022 |
| Lingo Sauce Limited | Manufacturing | 2025 |
| Link Aerospace Engineering Limited | Professional & scientific | 2008 |
| Link Mailing Systems Limited | Wholesale & retail | 1994 |
| Link ME Consulting Ltd | Professional & scientific | 2018 |
| Linke Limited | Information & communication | 2014 |
| Linkfirst Systems Limited | Information & communication | 2002 |
| Linkhaven Gatley Limited | Construction | 2006 |
| Linkweld Limited | Administrative & support | 2018 |
| Linkworx Consulting Ltd | Information & communication | 2025 |
| Linney Refridgerated Transport Ltd | Transport & logistics | 2016 |
| Linsay Wright Consultancy Limited | Professional & scientific | 2022 |
| Lintech Miller Ltd | Professional & scientific | 2019 |
| Linthtec Limited | Professional & scientific | 2013 |
| Linyuan Ltd | Hospitality | 2026 |
| Liol Consultancy Ltd | Professional & scientific | 2018 |
| Lion Dog Logistics Ltd | Transport & logistics | 2021 |
| Lion Rock Enterprises Limited | Hospitality | 2025 |
| Lion Turf Limited | Administrative & support | 2015 |
| Lionstride Limited | Financial services | 2025 |
| Lips by Laila Limited | Health & social care | 2025 |
| Liquid Pear AI Limited | Administrative & support | 2025 |
| Liquidline Vending Limited | Hospitality | 2026 |
| Lisa Armitage Consulting Limited | Administrative & support | 2023 |
| Lisa Koppl Therapy Ltd | Health & social care | 2026 |
| Lisa Littler Education Ltd | Education | 2022 |
| Lisa Slingsby Consultancy Services Ltd | Health & social care | 2011 |