| Kybrook Limited | Administrative & support | 2018 |
| KYC Knights Ltd | Information & communication | 2023 |
| KZO Security Ltd | Administrative & support | 2026 |
| L & P Trading Limited | Other services | 2008 |
| L & R Management Services Limited | Administrative & support | 2026 |
| L & S Vreko Catering Limited | Real estate | 2020 |
| L . V . a Properties Ltd | Real estate | 2016 |
| L a Alarms Limited | Construction | 1992 |
| L G Heating & GAS Limited | Construction | 2021 |
| L Harrison Tax Ltd | Professional & scientific | 2021 |
| L&C Creatives Limited | Professional & scientific | 2024 |
| L&M Properties International Limited | Real estate | 2015 |
| L&P Ecolead Limited | Professional & scientific | 2013 |
| L.A.R Management Ltd | Real estate | 2011 |
| L.D.E Construction Services Ltd | Construction | 2024 |
| L.O.M. Associates Limited | Real estate | 1998 |
| L9 Tech Solutions Ltd | Information & communication | 2024 |
| LA Academia Limited | Information & communication | 2021 |
| LA Bonne Idee Limited | Professional & scientific | 1990 |
| LA Boulle Ltd | Manufacturing | 2018 |
| LA Cosa Nostra Limited | Hospitality | 1993 |
| LA Dama Blanca Tours Ltd | Administrative & support | 2023 |
| LA Farina Santa Limited | Hospitality | 2023 |
| LA Strada Ltd | Professional & scientific | 2025 |
| Laawaris Limited | Hospitality | 2019 |
| Labelled With Love Ltd | Manufacturing | 2016 |
| Labroidery Limited | Manufacturing | 2020 |
| Lady Dragon Ltd | Wholesale & retail | 2023 |
| Ladybird Assets Limited | Real estate | 2025 |
| Laeticia Ingrid Holland Ltd | Professional & scientific | 2026 |
| LAF Events Limited | Arts & recreation | 2019 |
| Lafayon Trading UK Limited | Wholesale & retail | 2023 |
| Lafbery Developments Ltd | Construction | 2024 |
| LAG Consult Ltd | Information & communication | 2016 |
| Laguna Advisory Services Ltd | Professional & scientific | 2025 |
| Lake Plumbing & Heating Ltd | Construction | 2013 |
| Lakshmi Narasimha Ltd | Real estate | 2024 |
| Lamb & Partners Limited | Construction | 2009 |
| Lamonaca Clothing Ltd | Wholesale & retail | 2024 |
| Lancashire Film Office Ltd | Information & communication | 2026 |
| Landequal Property Management Limited | Households | 1997 |
| Landkey Construction Limited | Construction | 1996 |
| Landlord Pro Self-Management Limited | Real estate | 2025 |
| Landrate Limited | Information & communication | 2022 |
| Landwynn Limited | Information & communication | 2021 |
| Langham Maswell Limited | Information & communication | 2017 |
| Langleys Estate Limited | Real estate | 2016 |
| Lannababy Ltd | Wholesale & retail | 2025 |
| Lanry Development Limited | Construction | 2020 |
| Lansdowne Services Limited | Administrative & support | 2020 |
| Lantern Communications Ltd | Professional & scientific | 2020 |
| Lantern Medical Services Ltd | Health & social care | 2020 |
| Lanwarne Landscapes Ltd | Administrative & support | 2025 |
| Largeunique Limited | Households | 1991 |
| Lasmeg Logistics Limited | Wholesale & retail | 2017 |
| Last ELM Ltd | Construction | 2020 |
| Lasting Impressions Print Ltd | Manufacturing | 2022 |
| Latchford Holdings Limited | Financial services | 2019 |
| Latchford Investments Limited | Real estate | 2000 |
| Latchford Newco Limited | Hospitality | 2019 |
| Latent Time Limited | Information & communication | 2023 |
| Latif's & Sons Ltd | Wholesale & retail | 2025 |
| Latoni Limited | Health & social care | 2023 |
| LAU & Co Accountants Limited | Professional & scientific | 2012 |
| Lau's Company Limited | Professional & scientific | 2016 |
| Laub Ventures (Good Meat) LLP | | 2021 |
| Launcelot Productions Limited | Arts & recreation | 1967 |
| Launchpad Consulting Limited | Professional & scientific | 2016 |
| Launder Steedman Limited | Professional & scientific | 1996 |
| Laura Alana Properties Holdings Limited | Financial services | 2023 |
| Laura Alana Properties Limited | Financial services | 2023 |
| Laura Evans Design Limited | Professional & scientific | 2018 |
| Laurel Grill Ltd | Hospitality | 2025 |
| Laurendaw-Design Limited | Professional & scientific | 2012 |
| Laurian Solutions Ltd | Administrative & support | 2025 |
| Lavee Ltd | Manufacturing | 2020 |
| Laveen Services Limited | Other services | 2022 |
| Lavender Beauty Limited | Other services | 2022 |
| Lawai Research UK Ltd | Professional & scientific | 2026 |
| Lawher & Co Ltd | Professional & scientific | 2022 |
| Lawrence Greenberg Consultancy Limited | Professional & scientific | 2003 |
| Lawtons Solicitors Limited | Professional & scientific | 2007 |
| Laxman Consultants Limited | Professional & scientific | 2008 |
| Layzell Management Limited | Professional & scientific | 2018 |
| Lazarus of London Ltd | Wholesale & retail | 2017 |
| LB73 Management Limited | Real estate | 2018 |
| LBP CV I LLP | | 2021 |
| LBP CV III LLP | | 2021 |
| LBP FI I WMT LLP | | 2021 |
| LBP FI II LLP | | 2021 |
| LBP FI III LLP | | 2021 |
| LBP FI IV LLP | | 2021 |
| LBP FI V LLP | | 2022 |
| LBP FI VI LLP | | 2022 |
| LBP FI Viii LLP | | 2023 |
| Lbspace Ltd | Professional & scientific | 2017 |
| LCG Finance Limited | Administrative & support | 2019 |
| LDC Communications Limited | Information & communication | 2010 |
| LDH Domestic Appliance Repairs Limited | Other services | 2026 |
| Ldnlabs Ltd | Information & communication | 2018 |