| KWB Management Limited | Construction | 2021 |
| Kwik Seat Limited | Wholesale & retail | 2026 |
| Kwik.Coffee Ltd | Extraterritorial | 2014 |
| Kwisinechow Ltd | Hospitality | 2025 |
| Kymera Limited | Professional & scientific | 1996 |
| Kyowa Estates Ltd | Real estate | 2024 |
| Kyowa Ltd | Hospitality | 2017 |
| L & J Contractors Limited | Construction | 2020 |
| L & J Home Ltd | Transport & logistics | 2019 |
| L & L Developments Ltd | Real estate | 2017 |
| L & N Domestic Services Ltd | Real estate | 2025 |
| L a Bodyworks Accident and Repair Centre Limited | Wholesale & retail | 2013 |
| L a K Carpentry Services Limited | Construction | 2026 |
| L Bailey (Plumbing & Heating) Limited | Construction | 2015 |
| L Carty Electrical Contractors Ltd | Construction | 2023 |
| L Currie Reporting Ltd | Health & social care | 2025 |
| L F Harris (International) Limited | Wholesale & retail | 1977 |
| L H Consulting Solutions Ltd | Professional & scientific | 2025 |
| L J Medicalservices Ltd | Health & social care | 2024 |
| L Kendall Properties Limited | Real estate | 2019 |
| L Knight Catering Limited | Hospitality | 2022 |
| L M Stores Limited | Wholesale & retail | 2018 |
| L T Mechanical Services Limited | Wholesale & retail | 2022 |
| L Vanstone Building Services Ltd | Construction | 2021 |
| L&D Letting and Investments Ltd | Real estate | 2026 |
| L&E Plastering & Property Services Limited | Construction | 2026 |
| L&G DAW Properties Ltd | Households | 2025 |
| L&G Solutions Ltd | Wholesale & retail | 2019 |
| L&K Properties Plymouth Ltd | Households | 2022 |
| L&S Home Improvements (SW) Limited | Construction | 2026 |
| L'Odeur Ltd | Manufacturing | 2025 |
| L-600 Ltd | Hospitality | 2006 |
| L. V. Nautical Ltd | Wholesale & retail | 2016 |
| L.A.R.J Consultancy Ltd | Professional & scientific | 2020 |
| L.C. Automation Limited | Manufacturing | 1974 |
| L.C.Mechanical Services Ltd | Wholesale & retail | 2015 |
| L.Doble Limited | Real estate | 1962 |
| L.H.Gill (Western) Limited | Wholesale & retail | 1968 |
| L.S.J.S Consulting Ltd | Professional & scientific | 2022 |
| L4 Consultants Ltd | Professional & scientific | 2022 |
| LA Beau Nails Limited | Other services | 2024 |
| LA Derma Skin & Laser Clinic Ltd | Other services | 2025 |
| LA Italiana Ltd | Hospitality | 2019 |
| LA Maison Boheme Limited | Professional & scientific | 2013 |
| LA VIE EST Bell Limited | Hospitality | 2017 |
| Ladd Mortgages Limited | Financial services | 2025 |
| Ladock Property Management Limited | Households | 2019 |
| LAH Design Limited | Professional & scientific | 2016 |
| Laira Fort Properties Ltd | Real estate | 2020 |
| Laira Green Trust | Education | 2009 |
| Lajmui Care Ventures Limited | Wholesale & retail | 2023 |
| Lake Road House Ltd | Hospitality | 2022 |
| Lakeview Heating Services Ltd | Construction | 2018 |
| LAL Bagh Currys Ltd | Hospitality | 2024 |
| LAL Barber Limited | Other services | 2026 |
| LAM Health Care Ltd | Other services | 2017 |
| Lambert/Rubicon Ltd | Information & communication | 2011 |
| Lamble Properties Ltd | Construction | 2026 |
| Lamells Ltd | Real estate | 2019 |
| Lamerton Stores Limited | Wholesale & retail | 2023 |
| Laming Plastering Ltd | Construction | 2023 |
| Lamorran (Truro) Limited | Construction | 2017 |
| Lamosi Healthcare CIC | Health & social care | 2026 |
| Lams Properties Ltd | Real estate | 2020 |
| Lana Creole Kitchen Ltd | Hospitality | 2025 |
| Lancashire Sports & Performance Ltd | Wholesale & retail | 2018 |
| Land Developments (SW) Ltd | Real estate | 2015 |
| Land Power Ltd | Real estate | 2015 |
| Land Transport Southwest Limited | Transport & logistics | 2025 |
| Land Value Partners Ltd | Real estate | 2023 |
| Land Venture Properties Ltd | Construction | 2015 |
| Landart Drives & Patios Ltd | Administrative & support | 2022 |
| Landhub Group Ltd | Construction | 2025 |
| Landlord Services ( Management ) Ltd | Real estate | 2017 |
| Landmark Property and Developments Limited | Construction | 2026 |
| Landmark Utility Services Ltd | Construction | 2017 |
| Landmark Window Systems Limited | Construction | 2004 |
| Lane and Lane Developments Limited | Real estate | 2016 |
| Lane Hospitality Enterprises Ltd | Hospitality | 2024 |
| Lang & Potter (Flooring) Limited | Construction | 2005 |
| Lang Town & Country Estate Agents Limited | Real estate | 2011 |
| Lang Town & Country Holdings Limited | Financial services | 2015 |
| Lang Town & Country Lettings Limited | Real estate | 1997 |
| Lang Town and Country Group Limited | Financial services | 2021 |
| Langage AD Limited | Water & waste | 2010 |
| Langage Farm Limited Liability Partnership | | 2009 |
| Langdon View Management Company Limited | Real estate | 2017 |
| Langs (Plymouth) Limited | Real estate | 1980 |
| Langserve Electrical Ltd | Construction | 2024 |
| Lansdowne Ltd | Real estate | 2017 |
| Lansilva Estates Limited | Construction | 2021 |
| Lantech Communications Ltd | Information & communication | 2012 |
| Lapis Limited | Professional & scientific | 2011 |
| LAR Trading Ltd | Wholesale & retail | 2023 |
| Larachaos Ltd | Arts & recreation | 2025 |
| Lark Children's Centre | Education | 2000 |
| Larkowl Ltd | Other services | 2019 |
| Larmar Ltd | Professional & scientific | 2012 |
| Laroche Paraplanning Limited | Administrative & support | 2013 |
| Larry Speare Limited | Wholesale & retail | 1981 |