| KRR (UK) Limited | Manufacturing | 2006 |
| KT Construction Law Limited | Professional & scientific | 2014 |
| Kterio Ltd | Information & communication | 2021 |
| Kudos Partners Ltd | Administrative & support | 2019 |
| Kudu Investments Limited | Real estate | 2012 |
| Kukama Group Limited | Real estate | 2016 |
| Kumya Ltd | Information & communication | 2023 |
| Kunal Crafts Ltd | Wholesale & retail | 2026 |
| Kunpeng Studios Ltd | Information & communication | 2025 |
| Kurdish Barbers Guildford Ltd | Other services | 2025 |
| KW Media SCG Ltd | Wholesale & retail | 2019 |
| Kyanmedia Limited | Information & communication | 2002 |
| Kyngeshene Gardens Management Company Limited | Households | 2005 |
| Kyngeshene Management Company Limited | Households | 2001 |
| L & B Property Solutions Limited | Real estate | 2010 |
| L & E Painters Limited | Construction | 2018 |
| L & J Interior Design Ltd | Professional & scientific | 2017 |
| L & L Evergreen Properties Limited | Real estate | 2022 |
| L & P Jewellery Limited | Wholesale & retail | 2008 |
| L a C (Guildford) Limited | Transport & logistics | 2018 |
| L a Newcombe Coaching Limited | Education | 2023 |
| L Anderton (UK) Limited | Wholesale & retail | 2011 |
| L M Handyman Limited | Professional & scientific | 2017 |
| L&V Hair Boutique Ltd | Other services | 2018 |
| L'Antica Bottega Limited | Wholesale & retail | 2010 |
| L'Orfebre UK, Ltd | Wholesale & retail | 2019 |
| L.O.C. Associates Ltd. | Professional & scientific | 2001 |
| L.T.H. Coachworks Limited | Wholesale & retail | 1992 |
| L4AMB Ltd | Professional & scientific | 2011 |
| LA Maison DU Languedoc Limited | Hospitality | 2004 |
| LA Montee Limited | Wholesale & retail | 2012 |
| LA Mort Ltd | Wholesale & retail | 2020 |
| Ladies Links Collective Ltd | Other services | 2025 |
| Ladygrove Farm Management Limited | Real estate | 2007 |
| Lake and Mountain Ltd | Professional & scientific | 2019 |
| Land a Fish Ltd | Agriculture & fishing | 2009 |
| Landing Light Ltd | Administrative & support | 2022 |
| Landmark Residential Homes Limited | | 1985 |
| Landmark Roofing Services Limited | Wholesale & retail | 2013 |
| Landmarque Homes Management (Smiles) Limited | Households | 2006 |
| Landsborough Accounting Services Limited | Professional & scientific | 2008 |
| Landscape Performance Ltd | Administrative & support | 2023 |
| Langdon Grange Limited | Construction | 2025 |
| Langdon Grange Management Company Limited | Households | 2024 |
| Langley Park (Freehold) Sutton Limited | Households | 2017 |
| Langmere Planning Ltd | Information & communication | 2025 |
| Langton Priory Management Company Ltd | Households | 2015 |
| Langtry 42 Limited | Real estate | 2010 |
| Lanistown Ltd | Administrative & support | 2018 |
| Lansdown Owners Association Limited | Real estate | 2005 |
| Larema Ltd | Professional & scientific | 2016 |
| Largo Consultancy Limited | Professional & scientific | 2017 |
| Lark Recordings Limited | Information & communication | 2014 |
| Larnie Limited | Administrative & support | 2021 |
| Larryvision Limited | Information & communication | 2013 |
| Lascombe Interiors Ltd | Wholesale & retail | 2021 |
| Latc Group UK Limited | Agriculture & fishing | 2021 |
| Latchguard Limited | Real estate | 1988 |
| Late Starter Group Limited | Professional & scientific | 2011 |
| Lattice Waffle Ltd | Wholesale & retail | 2023 |
| Laura Brown Advisory Limited | Professional & scientific | 2026 |
| Laurenhall Group Ltd | Real estate | 2025 |
| Laurie Stone Limited | Professional & scientific | 2007 |
| Lavergne Consultancy Ltd | Construction | 2024 |
| Lawbridge Advisory Ltd | Professional & scientific | 2022 |
| Lawbrook Limited | Professional & scientific | 2014 |
| Lawbrook Taverns Ltd | Hospitality | 2023 |
| Lawers Estate Company Limited | Real estate | 2019 |
| Lawers Great Northern Holdings Limited | Financial services | 2020 |
| Lawford Greenway Limited | Information & communication | 2010 |
| Lawrence London Group Ltd | Wholesale & retail | 2025 |
| Layer 16 Limited | Professional & scientific | 2001 |
| Layered Information Technology UK Ltd | Information & communication | 2017 |
| Lazarus Repeats Limited | Professional & scientific | 2009 |
| LBM Ecology Ltd | Professional & scientific | 2026 |
| LC Energy Limited | Wholesale & retail | 2007 |
| Lcbp Limited | Professional & scientific | 2015 |
| LCC Lighting Limited | Professional & scientific | 2012 |
| LCC Photon Technik Limited | Manufacturing | 1999 |
| LCC Systems Limited | Professional & scientific | 2012 |
| LCD General Cleaning Services Limited | Administrative & support | 2021 |
| LCD General Maintenance Limited | Construction | 2019 |
| LD Brickwork Limited | Construction | 2014 |
| LD Construction & Landscaping Ltd | Construction | 2023 |
| LD Residential Lettings Ltd | Real estate | 2025 |
| LDC Limited | Administrative & support | 1983 |
| LE Crossing Company Limited | Construction | 2002 |
| LE Jardin Prive Ltd | Arts & recreation | 2019 |
| LE Tilleul Limited | Other services | 2017 |
| Lead With Adhd Ltd | Education | 2025 |
| Leaders Futures Limited | Professional & scientific | 2018 |
| Leadflex Commercial Solutions Ltd | Professional & scientific | 2026 |
| Learning Partners Academy Trust | Education | 2012 |
| Lease Solutions Pro Limited | Professional & scientific | 2023 |
| Lebanese Mezza & Grill Ltd | Hospitality | 2025 |
| Ledgeron Accounting Firm Ltd | Wholesale & retail | 2025 |
| Leditbe Ltd | Wholesale & retail | 2022 |
| LEE Farm Limited | Agriculture & fishing | 2014 |
| LEE Robinson Properties Limited | Real estate | 2015 |
| LEE Walters Limited | Other services | 2005 |