| Kbvb Property Limited | Real estate | 2025 |
| Kbvb PVT Ltd | Wholesale & retail | 2025 |
| KCS Motor Services Limited | Wholesale & retail | 2023 |
| Keates Electrical Limited | Construction | 2023 |
| Keinton Mandeville Management Co Ltd | Households | 2022 |
| Keith Stuart Ltd | Information & communication | 2007 |
| Kelly & Co. Holdings Ltd | Financial services | 2025 |
| Kelly Project Solutions Limited | Administrative & support | 2025 |
| Kelly's Donkeys Ltd | Agriculture & fishing | 2020 |
| Kelston Consultants Limited | Administrative & support | 1999 |
| Kennett Hall Holdings (Frome) Limited | Administrative & support | 1989 |
| KEW Estates Limited | Real estate | 1999 |
| Key Reward Ltd | Professional & scientific | 2008 |
| Keyford Community Interest Company | Health & social care | 2025 |
| Keyford Hedgehog Rescue & Rehabilitation CIC | Other services | 2025 |
| Keyford Holdings Limited | Financial services | 2007 |
| Keystone HR Consultancy Limited | Professional & scientific | 2015 |
| KHH Media Limited | Administrative & support | 2025 |
| Kiamgenics Laboratories Ltd | Professional & scientific | 2022 |
| Kilkenny SPV Ltd | Construction | 2024 |
| Kimyan Originalities Ltd | Financial services | 2022 |
| Kingman’S Butchers Ltd | Manufacturing | 2018 |
| Kingsmead Street Bottle Limited | Wholesale & retail | 2020 |
| Kingston Hospitality Group Ltd | Hospitality | 2026 |
| Kiraku Limited | Wholesale & retail | 2011 |
| Kirkpatrick Agencies Limited | Wholesale & retail | 2003 |
| Kirrin Enterprises Ltd | Information & communication | 2016 |
| KJP Media Ltd | Information & communication | 2019 |
| Kobayashi-Whittaker Ltd | Wholesale & retail | 2017 |
| Kosw Ltd | Health & social care | 2022 |
| Kova Bathrooms Limited | Construction | 2026 |
| Kpjc Mobile Plant Services Ltd | Administrative & support | 2023 |
| KRG Property Limited | Wholesale & retail | 2006 |
| Kwik Media Ltd | Information & communication | 2020 |
| L C Ceramics Ltd | Construction | 2015 |
| L'N'B Groundwork Contractors Ltd | Construction | 2017 |
| Lace & Grace Bridal Boutique Ltd | Wholesale & retail | 2015 |
| Lack of Law Ltd | Professional & scientific | 2026 |
| Lakeborn Ltd | Administrative & support | 2014 |
| Lakeside BEE Services Ltd | Agriculture & fishing | 2023 |
| Land & Mineral Management Limited | Professional & scientific | 2020 |
| Land & Property Management Agents Limited | Real estate | 1998 |
| Land Network (Frome) Limited | Water & waste | 2011 |
| Land, Food and Medicine Ltd | Agriculture & fishing | 2024 |
| Landstory Design Ltd | Professional & scientific | 2019 |
| Lane Fundraising and Events Limited | Administrative & support | 2012 |
| Lansdown Geophysics Ltd | Professional & scientific | 2018 |
| Lansdown Mews Management Company Limited | Real estate | 1991 |
| Larner Sing Limited | Professional & scientific | 2010 |
| Last Hope Outreach Ltd | Agriculture & fishing | 2025 |
| Latham Scaffolding Ltd | Construction | 2016 |
| Latitude Tents Limited | Wholesale & retail | 2019 |
| Lattimergrange Investments Limited | Real estate | 2005 |
| Lattimergrange Limited | Real estate | 1973 |
| Leaze House RTM Company Limited | Households | 2013 |
| Leboo Media Limited | Administrative & support | 2014 |
| LEE MAC & Sons Limited | Construction | 2019 |
| LEF Accountancy Ltd | Professional & scientific | 2026 |
| Legacy Antiques and Collectibles Ltd | Wholesale & retail | 2008 |
| LEO Pubs&Hotels Ltd | Hospitality | 2024 |
| LES Wilton Associates Limited | Administrative & support | 2004 |
| Level UP Motorsport Ltd | Wholesale & retail | 2026 |
| Lexne Limited | Manufacturing | 2019 |
| Lexvision Holdings Limited | Information & communication | 2015 |
| LFS Developments Limited | Real estate | 2025 |
| LGS Developments Ltd | Real estate | 2026 |
| Liberty Gymnastics Club Ltd | Arts & recreation | 2012 |
| Libra Travel Limited | Transport & logistics | 2009 |
| Lickety Split Bath Ltd | Hospitality | 2021 |
| Life and Mobility Solutions Ltd. | Wholesale & retail | 2014 |
| Lifecare Health Limited | Health & social care | 2010 |
| Lifeline Homecare Limited | Health & social care | 2003 |
| Lifestyle Loans Holdings Ltd | Financial services | 2018 |
| Lighthouse Retail Limited | Wholesale & retail | 2017 |
| Lilley's Cider Limited | Manufacturing | 2003 |
| Lilliaempire Ltd | Wholesale & retail | 2013 |
| Lina House Projects Ltd | Construction | 2022 |
| Linkmead Limited | Administrative & support | 1999 |
| Linwood Motors Limited | Wholesale & retail | 2009 |
| Lions Construction Ltd | Construction | 2022 |
| Literary Emporium Ltd | Wholesale & retail | 2014 |
| Little Bulb Theatre | Arts & recreation | 2011 |
| Little Jack Horners Ltd | Hospitality | 2009 |
| Little Learning Ladder Limited | Health & social care | 2011 |
| Little Origins Ltd | Manufacturing | 2020 |
| Little SIP Properties Ltd | Real estate | 2025 |
| Living DNA Limited | Administrative & support | 2016 |
| LIZ Chandler Dvds Ltd | Wholesale & retail | 2016 |
| LIZ Chandler Limited | Health & social care | 2010 |
| LIZ Quilter Limited | Real estate | 1994 |
| LJG Aesthetics Ltd | Health & social care | 2025 |
| LJM South West Ltd | Construction | 2020 |
| LM Commercial Property Ltd | Real estate | 2024 |
| LMP Management Limited | Real estate | 2021 |
| Loadgate Limited | Real estate | 1993 |
| Lockspin Limited | Agriculture & fishing | 1997 |
| Logdit Ltd | Information & communication | 2026 |
| Lomellini Limited | Manufacturing | 2025 |
| Lone Poplar Limited | Education | 2022 |
| Long Ground 1970 Limited | Extraterritorial | 2014 |