| Liddiard Limited | Hospitality | 2008 |
| Life Britannia First LP | | 2006 |
| Life Britannia Second LP | | 2008 |
| Life Creative Funding Ltd | Financial services | 2023 |
| Life in Step Limited | Arts & recreation | 1993 |
| Lifeisrosey Ltd | Education | 2021 |
| Lifesavers Emergency Tyres Ltd | Wholesale & retail | 2024 |
| Lifestyle Food & Wine Limited | Wholesale & retail | 2022 |
| Lift Your Career Ltd | Professional & scientific | 2022 |
| Light Delight Ltd | Construction | 2021 |
| Light of Tzefat Limited | Households | 2019 |
| Light Rock Removals Limited | Transport & logistics | 2019 |
| Lightening (SW) Ltd | Hospitality | 2024 |
| Lightening (West) Ltd | Hospitality | 2024 |
| Lightening Films Limited | Information & communication | 2013 |
| Lightening Ltd | Hospitality | 2024 |
| Lightening South Ltd | Hospitality | 2024 |
| Lights R US Ltd | Wholesale & retail | 2020 |
| Lila Vincent Theatre Arts Limited | Education | 2022 |
| Lilianalazari Academy Ltd | Education | 2025 |
| Lilident Limited | Health & social care | 2018 |
| Lilliput House Holdings Ltd | Financial services | 2017 |
| Lilliput House Limited | Health & social care | 2007 |
| Lilly Spa Nails Ltd | Other services | 2024 |
| Lillywhite Cosmetics Ltd | Wholesale & retail | 2022 |
| Lilmod Resources Limited | Health & social care | 2015 |
| Lilpea Limited | Information & communication | 2025 |
| Lily LEO Ltd | Real estate | 2023 |
| Lilydawn Limited | Other services | 2007 |
| Lima Estates Limited | Real estate | 2008 |
| Limakb Ltd | Transport & logistics | 2022 |
| Limba Property Ltd | Real estate | 2020 |
| Limbrook Limited | Professional & scientific | 2025 |
| Lime Tree Close (Bushey) Management Company Limited | Households | 2011 |
| Limeleaf Court Freeholders Limited | Real estate | 2005 |
| Limeleaf Court Management Company Limited | Real estate | 2005 |
| Limitlessgfi Ltd | Transport & logistics | 2021 |
| LIN Food Surrey Ltd | Hospitality | 2017 |
| Linda Sohan Limited | Information & communication | 2017 |
| Lingvo State Ltd | Professional & scientific | 2018 |
| Link Cars UK Ltd | Transport & logistics | 2011 |
| Link Mortgage Ltd | Financial services | 2020 |
| Link Road Fish and Chips Limited | Hospitality | 2025 |
| Link Road Fish Bar Limited | Hospitality | 2024 |
| Link Sales Limited | Information & communication | 2004 |
| Links View (N2 OPD) RTM Company Limited | Households | 2009 |
| Linthorp Limited | Wholesale & retail | 2025 |
| Linus Mutty Limited | Financial services | 2017 |
| LIO Tech Limited | Information & communication | 2012 |
| Lion Recovery Ltd | Transport & logistics | 2025 |
| Lips Legal Limited | Education | 2019 |
| Lisheng Ltd | Hospitality | 2019 |
| Litera Offshore Logistics Ltd | Professional & scientific | 2024 |
| Lithad Crownage Limited | Real estate | 2024 |
| Lithad Holdings Limited | Real estate | 2024 |
| Litigation Futures Limited | Other services | 2011 |
| Litke Caterers Ltd | Hospitality | 2016 |
| Litlev 1 Limited | Real estate | 2024 |
| Litlev Estates Ltd | Real estate | 2024 |
| Litmay (Seven Sisters) Ltd | Real estate | 2016 |
| Litmay Leasehold Flats Limited | Real estate | 2022 |
| Litmay Limited | Real estate | 2010 |
| Little Agenda Ltd | Information & communication | 2026 |
| Little Angels Care Ltd | Health & social care | 2024 |
| Little Angels DC Limited | Health & social care | 2026 |
| Little Greta Limited | Professional & scientific | 2019 |
| Little Madame Ltd | Wholesale & retail | 2020 |
| Little ME Nursery (Hendon) Limited | Health & social care | 2025 |
| Little Resham Ltd | Hospitality | 2021 |
| Little Squid Limited | Administrative & support | 2018 |
| Livi Properties Ltd | Real estate | 2022 |
| Living in Design Partnership Ltd | Wholesale & retail | 2018 |
| Livixhub Supplies Ltd | Wholesale & retail | 2026 |
| Lizon Bliss Ltd | Wholesale & retail | 2025 |
| LJ Heating Limited | Construction | 2010 |
| LJ Music Entertainment Limited | Information & communication | 2019 |
| Ljfh Engineering Limited | Professional & scientific | 2024 |
| Ljt’S Holdings Limited | Real estate | 2025 |
| Lkck Limited | Real estate | 2025 |
| LKW Ltd | Administrative & support | 2019 |
| Lmeg Properties Ltd | Real estate | 2021 |
| LMM Brothers Ltd | Construction | 2012 |
| LMM Systems Ltd | Information & communication | 2018 |
| LMS Castlemaine Ltd | Real estate | 2024 |
| LN Mobile Tyres Ltd | Wholesale & retail | 2026 |
| LND Property Maintenance Ltd | Construction | 2023 |
| Lo.Ca Trading Limited | Wholesale & retail | 2016 |
| Loaded Box Ltd | Hospitality | 2026 |
| Loan & Asset Finance Recoveries Limited | Real estate | 2009 |
| Local Mobile Tyres & Autos Ltd | Wholesale & retail | 2019 |
| Lockout Locksmiths Ltd | Manufacturing | 2021 |
| Lockwood Audio Limited | Wholesale & retail | 2022 |
| Lockwood Loudspeakers Limited | Wholesale & retail | 2022 |
| Locum Medics Ltd | Health & social care | 2009 |
| Logex Studios Ltd | Information & communication | 2024 |
| Logsupp Ltd | Transport & logistics | 2025 |
| Lojo Consultants Limited | Professional & scientific | 2017 |
| Lojrev Limited | Information & communication | 2020 |
| Loki Holdings International Limited | Real estate | 2021 |
| Lokman Limited | Manufacturing | 2014 |