| Little Paper Press Ltd | Wholesale & retail | 2011 |
| Little York Limited | Real estate | 2015 |
| Littlefrog Recruitment Limited | Financial services | 2018 |
| Littlemoor School Management Company Limited | Real estate | 2007 |
| Live & Breathe Travel Ltd | Administrative & support | 2023 |
| Live for Today Ltd | Arts & recreation | 2011 |
| Live Lean for Longevity Ltd | Public administration | 2025 |
| Live Wild & Grow Ltd | Administrative & support | 2014 |
| Live Yorkshire Limited | Professional & scientific | 2008 |
| Livermore Limited | Extraterritorial | 2025 |
| Liverpool Electronic Cigarette Co Ltd | Professional & scientific | 2011 |
| Livewell Vending Ltd | Wholesale & retail | 2006 |
| Livingstone House Management Limited | Real estate | 2002 |
| Livock Parker Limited | Professional & scientific | 2016 |
| Liz's Locum Agency Ltd | Wholesale & retail | 2024 |
| Lizbert Enterprise Ltd | Real estate | 2025 |
| Ljdm Care Ltd | Health & social care | 2023 |
| LJG Consultants Limited | Administrative & support | 2018 |
| Lkanesin Ltd | Transport & logistics | 2025 |
| Lloyd Lane Ltd | Health & social care | 2017 |
| LM Lighting Technology Limited | Information & communication | 2011 |
| LM1 Limited | Financial services | 2020 |
| LMC Services Yorkshire CIC | Other services | 2020 |
| LMR Plumbing & Heating Contractors Limited | Construction | 2023 |
| Loadstone Limited | Professional & scientific | 2001 |
| Local Hero Ltd | Extraterritorial | 2012 |
| Lock Smithy Ltd | Administrative & support | 2025 |
| Locke Limited | Information & communication | 2025 |
| Lockrite Harrogate Ltd | Manufacturing | 2025 |
| Lockwoods Restaurant Limited | Hospitality | 2014 |
| Logbook Lending Limited | Financial services | 2010 |
| Logic Property Group Limited | Construction | 2023 |
| Logic Property Interiors Limited | Construction | 2023 |
| Logic Recruiting Ltd | Administrative & support | 2021 |
| Lokate Promotions Ltd | Professional & scientific | 2003 |
| Lola Rossa Jewellery Limited | Wholesale & retail | 2014 |
| Lolli and POP Ltd | Wholesale & retail | 2025 |
| London School of Mediation Ltd | Administrative & support | 2010 |
| Long & Co (Harrogate) Ltd | Professional & scientific | 2011 |
| Long Holdings (Harrogate) Ltd | Real estate | 2024 |
| Longchambon Limited | Extraterritorial | 2026 |
| Longden-Partners in Property Limited | Administrative & support | 1999 |
| Longueville Estates Ltd | Real estate | 2021 |
| Longwood Bespoke Joinery Limited | Manufacturing | 2020 |
| Loof Properties Limited | Real estate | 2019 |
| Loop Hole Limited | Extraterritorial | 2012 |
| Loopie Limited | Professional & scientific | 2016 |
| Lord Hodge Limited | Real estate | 1959 |
| Lords Chop House Ltd | Other services | 2017 |
| Lorna Westbury Accountancy Ltd | Professional & scientific | 2023 |
| Lorraine J Campbell Limited | Information & communication | 2017 |
| Lost Dream Jewellery Limited | Manufacturing | 2021 |
| LOU1E Limited | Extraterritorial | 2018 |
| Loublou Ltd | Wholesale & retail | 2024 |
| Loublou Ripon Ltd | Wholesale & retail | 2026 |
| Louder Logistics Ltd | Administrative & support | 2024 |
| Loudoun Services Ltd | Professional & scientific | 2023 |
| Louisa Black Limited | Other services | 2012 |
| Louise Hoste Consultancy Ltd | Professional & scientific | 2025 |
| Louisesellers Ltd | Health & social care | 2023 |
| Love UK Work Experience Ltd | Other services | 2019 |
| Love Your House Ltd | Construction | 2024 |
| Lovegrove Limited | Extraterritorial | 2026 |
| LOW Lane Farm Ltd | Real estate | 2025 |
| Lowfields Group Limited | Financial services | 2026 |
| Lowton Finance Ltd | Real estate | 2020 |
| Loxley Finishing Co Ltd | Construction | 2025 |
| Loyaltymatters Ltd | Information & communication | 2003 |
| LOZ Contreras Music Ltd | Administrative & support | 2020 |
| LP Bookkeeping & Business Solutions Limited | Professional & scientific | 2019 |
| LP Connect Limited | Professional & scientific | 2020 |
| LP Probate Services Limited | Professional & scientific | 2016 |
| Lpphospitality Ltd | Hospitality | 2026 |
| LR Charlton Ltd | Financial services | 2021 |
| LS Hairdressing (Harrogate) Ltd | Other services | 2025 |
| Lsce Limited | Professional & scientific | 2014 |
| Lscp Consulting Limited | Professional & scientific | 1997 |
| Lscp Limited | Professional & scientific | 2018 |
| Lscp Nominees Limited | Administrative & support | 1998 |
| LSN Solutions Ltd | Arts & recreation | 2008 |
| LT Design (Harrogate) Limited | Professional & scientific | 2015 |
| LUC1NDA Limited | Extraterritorial | 2020 |
| LUC4S Limited | Extraterritorial | 2018 |
| Lucasworks Limited | Real estate | 2021 |
| Lucille Limited | Extraterritorial | 2020 |
| Lucky FM Ltd | Extraterritorial | 2015 |
| Lucy Meredith Limited | Professional & scientific | 2013 |
| Luke Mclaughlin Ltd | Arts & recreation | 2022 |
| Lukepook Ltd | Manufacturing | 2022 |
| Lula Investments Limited | Professional & scientific | 2024 |
| Luma Business Consultants Limited | Professional & scientific | 2020 |
| Lumax Lighting Limited | Wholesale & retail | 2024 |
| Lumen Technologies Apac Holdings Limited | Information & communication | 2021 |
| Lumen Technologies Europe Holdings Limited | Information & communication | 2023 |
| Lumen Technologies Solutions UK Limited | Information & communication | 2023 |
| Lumexa Partners LLP | | 2025 |
| Lumineo Centre Limited | Wholesale & retail | 2016 |
| Luminis Solutions Ltd | Administrative & support | 2025 |
| Luminos Insight Ltd | Administrative & support | 2023 |
| Lumitech Solutions Ltd | Wholesale & retail | 2024 |