| Jerbiss Limited | Construction | 2017 |
| Jeremy Peter Christopher Pitman Limited | Extraterritorial | 2022 |
| Jessica Adams Ltd | Professional & scientific | 2020 |
| JGP Real Estate Limited | Real estate | 2013 |
| JHT Enterprises Ltd | Wholesale & retail | 2022 |
| Jill F Estates Ltd | Real estate | 2026 |
| Jill Scott Limited | Real estate | 1965 |
| JIM Brooks Electrical Limited | Construction | 2003 |
| Jjsd Ltd | Professional & scientific | 2022 |
| JLT Communications Ltd | Agriculture & fishing | 2002 |
| JM Holdings Dorset Limited | Financial services | 2025 |
| JM Reed Ltd | Construction | 2025 |
| JMS Physiotherapy Limited | Health & social care | 2026 |
| JOE & James Ltd | Information & communication | 2026 |
| JOE Mccrae Studio Ltd | Professional & scientific | 2026 |
| John Greenwood Consulting Ltd | Professional & scientific | 2024 |
| John Mckenzie Niche Enterprises Limited | Information & communication | 2011 |
| JON Brierley Creative Ltd | Information & communication | 2024 |
| JON Thorner's Limited | Real estate | 2002 |
| Jonathan Randall Kitchens Ltd | Manufacturing | 2012 |
| Jonathan Stride Ltd | Professional & scientific | 2020 |
| Jonny Parker Ltd | Professional & scientific | 2023 |
| Jonty Works Limited | Hospitality | 2003 |
| JP Fabrications Limited | Manufacturing | 2008 |
| Jp's Barber Shop Ltd | Other services | 2010 |
| Jroas Property Investments Limited | Real estate | 2019 |
| JS Lily Ltd | Hospitality | 2018 |
| JS Partners & Co Limited | Real estate | 2014 |
| JS Partners Group Ltd | Real estate | 2015 |
| Jsps Environmental Limited | Water & waste | 2018 |
| JSS (Sherborne) Ltd | Real estate | 2018 |
| Julia Nicholls Communications Limited | Professional & scientific | 2020 |
| Julian Barran Limited | Wholesale & retail | 1991 |
| JW Dowding Limited | Agriculture & fishing | 2025 |
| Jwbhair Ltd | Other services | 2024 |
| K S Reversions Limited | Real estate | 2007 |
| K&J Property Limited | Real estate | 2016 |
| Kacanik Consulting Ltd | Professional & scientific | 2025 |
| Kafuri Eleven Limited | Health & social care | 2025 |
| Kaleidoscope Day Nursery Limited | Health & social care | 2009 |
| Kalypsos Limited | Other services | 2002 |
| Kate Marano Interiors Ltd | Professional & scientific | 2025 |
| Kathy & KO Limited | Education | 2011 |
| Katie Farrell E-Consultant Ltd | Information & communication | 2023 |
| KAY Gibbs - Holiday LET Coach Limited | Professional & scientific | 2026 |
| KB Luxe Nails & Spa Ltd | Other services | 2025 |
| KBW Builders Ltd | Construction | 2019 |
| Kebab Port Ltd | Hospitality | 2025 |
| Keel Mental Fitness Limited | Other services | 2021 |
| Keene Beans Limited | Education | 2017 |
| Keinton Mandeville LVA LLP | | 2017 |
| Kempe Ltd | Professional & scientific | 2020 |
| Kevin Stringer Consulting Ltd | Professional & scientific | 2020 |
| Key Software Communications Ltd | Information & communication | 2015 |
| Keyford Frome LVA LLP | | 2017 |
| Ki-Tech Solutions & Innovations Ltd | Information & communication | 2022 |
| King & Brooks Solar Energy Limited | Construction | 2023 |
| Kingscourt Meadow 1 (Gillingham) Management Company Limited | Households | 2003 |
| Kingston Crest Limited | Construction | 2026 |
| Kington LVA LLP | | 2022 |
| Kipling Tours Limited | Administrative & support | 2014 |
| KLN Corporation Limited | Professional & scientific | 2025 |
| KLP PUB Ltd | Hospitality | 2023 |
| Kollective Architects and Designers Ltd | Professional & scientific | 2025 |
| Korkhouse Ltd | Hospitality | 2023 |
| Ksas Property Ltd | Real estate | 2018 |
| KTM Welding & Fabrications Ltd | Manufacturing | 2014 |
| Kyna Software Limited | Information & communication | 1997 |
| L & L Corporation Limited | Financial services | 2025 |
| L and P Property LET Limited | Real estate | 2022 |
| L and P Property Renovations Ltd | Construction | 2023 |
| L Rallison Plumbing & Heating Ltd | Construction | 2019 |
| Lais Creative Limited | Arts & recreation | 2021 |
| Lambert Court Management Limited | Households | 1982 |
| Lambprop Investments Ltd | Real estate | 2022 |
| Land Assets Limited | Real estate | 2009 |
| Land Value Alliances LLP | | 2013 |
| Landkey LVA LLP | | 2017 |
| Langport LVA LLP | | 2017 |
| Larch Hill Ltd | Financial services | 2026 |
| Large Energy Model Technologies Holdings Limited | Financial services | 2026 |
| Large Energy Model Technologies Limited | Professional & scientific | 2025 |
| LAS Lilas Limited | Agriculture & fishing | 2020 |
| Launcestones Limited | Extraterritorial | 2010 |
| Lavender Keepers Cafe Limited | Hospitality | 2021 |
| Lawi Barbers Ltd | Other services | 2023 |
| Lawrence and Thomas Limited | Professional & scientific | 2003 |
| Lawson and FOX LLP | | 2025 |
| Lawson Ward Studio Ltd | Professional & scientific | 2019 |
| Laycock Cider Ltd | Manufacturing | 2018 |
| LEB Electronics Ltd | Manufacturing | 2026 |
| Leek LVA LLP | | 2017 |
| Leigh Land Limited | Agriculture & fishing | 2006 |
| Leisure and Property International Limited | Real estate | 1994 |
| Lelapa Ltd | Other services | 2022 |
| Lenikap Limited | Arts & recreation | 1983 |
| Lenthay Court (Sherborne) Limited | Real estate | 1990 |
| Lepanto Consultancy Limited | Professional & scientific | 2015 |
| Lepton Weldon Holdings Ltd | Financial services | 2024 |
| Leweston Enterprises Limited | Education | 2010 |