| Jberrisford Property Ltd | Real estate | 2022 |
| JCC Bitumen Limited | Other services | 2021 |
| JCP Investment Holdings Ltd | Real estate | 2018 |
| JDS Contractors Limited | Construction | 2016 |
| Jennifer Elizabeth Ltd | Real estate | 2022 |
| Jenny Trickett Ltd | Professional & scientific | 2004 |
| Jesson Estates Management Ltd | Real estate | 2025 |
| Jetace Consulting Ltd | Information & communication | 2022 |
| Jewl Property Investments Ltd | Real estate | 2023 |
| JH EL Limited | Manufacturing | 2020 |
| JH Fresh Foods Ltd | Hospitality | 2019 |
| Jimary Limited | Wholesale & retail | 2011 |
| JJ Platinum Limited | Wholesale & retail | 2025 |
| JJ Studios LLP | | 2010 |
| JJD Consulting Ltd | Administrative & support | 2024 |
| JJE Contracts Ltd | Construction | 2025 |
| JJM Norfolk Holdings Limited | Extraterritorial | 2023 |
| JJR Engineering Ltd | Construction | 2026 |
| JM & AM Holdings Ltd | Financial services | 2026 |
| Joanne Carly Events Ltd | Other services | 2017 |
| Joanne Carly Holidays Limited | Administrative & support | 2024 |
| JOE Hamilton Roofing Ltd | Construction | 2026 |
| JOE Savage Development Consultancy Limited | Professional & scientific | 2015 |
| JOE Thornborrow Ltd | Real estate | 2002 |
| John Brookshaw & Sons Ltd | Wholesale & retail | 2011 |
| John Garrett Accounting and Consultancy Ltd | Extraterritorial | 2016 |
| Johnson & Bulkeley Ltd | Real estate | 2025 |
| Johnston Property Services Limited | Professional & scientific | 2018 |
| JON Graphic Design Limited | Professional & scientific | 2013 |
| Jordy's Pizzeria Ltd | Hospitality | 2023 |
| Jordys Pizza Ltd | Hospitality | 2020 |
| Jorge One Limited | Wholesale & retail | 2019 |
| Joseph Edwards & Sons Ltd | Other services | 2016 |
| Joseph Heler Limited | Manufacturing | 1972 |
| Joy PP Limited | Real estate | 2024 |
| JP Housing Consultancy Ltd | Professional & scientific | 2026 |
| JPT Altitude Ltd | Manufacturing | 2022 |
| JR Roofing and Maintenance Ltd | Construction | 2024 |
| JRT UK Services Limited | Construction | 2025 |
| JS Wade Property Limited | Real estate | 2014 |
| JT Music UK Limited | Information & communication | 2009 |
| JT Property Maintenance Limited | Administrative & support | 2009 |
| JTD Aviation Limited | Extraterritorial | 2024 |
| Jurupa Resourcing Limited | Administrative & support | 2014 |
| Just Stay Limited | Real estate | 2025 |
| K & K Squared Limited | Wholesale & retail | 2015 |
| K B Griffiths Limited | Health & social care | 2015 |
| K H Joinery Ltd | Construction | 2016 |
| K&S Property Solutions Ltd | Real estate | 2015 |
| K.G2 Trading Ltd | Wholesale & retail | 2026 |
| K2 Barbers Limited | Other services | 2024 |
| K300 Consultancy Ltd | Professional & scientific | 2021 |
| Kaitani Ltd | Transport & logistics | 2026 |
| Kaloflow Ltd | Information & communication | 2026 |
| Kanecta UK Ltd | Administrative & support | 2023 |
| Kara Food 1 Ltd | Hospitality | 2026 |
| Kardamena Ltd | Real estate | 2021 |
| Karemmi Limited | Real estate | 2017 |
| Kase Projects Ltd | Professional & scientific | 2018 |
| Kashmir and Silk Limited | Wholesale & retail | 2010 |
| Katian Limited | Transport & logistics | 2014 |
| Katy Britton Bride Ltd | Wholesale & retail | 2006 |
| KB & Co Consultancy Ltd | Information & communication | 2023 |
| KB & Co Property Ltd | Real estate | 2019 |
| KBE Project Services Ltd | Professional & scientific | 2014 |
| KD Health Consulting Limited | Professional & scientific | 2016 |
| Keele Homes Limited | Construction | 2012 |
| Keenan UK Holdings Limited | Information & communication | 2019 |
| Keith Shore Limited | Agriculture & fishing | 2005 |
| Kevan Developments Ltd | Real estate | 2025 |
| Keyplan Shopfitting Limited | Construction | 1986 |
| KI Derma UK Ltd | Health & social care | 2025 |
| Kifco Ltd | Professional & scientific | 2018 |
| Kindmost Limited | Administrative & support | 1988 |
| Kings Court (Nantwich) Management Company Limited | Households | 1997 |
| Kingsford Limited | Financial services | 2025 |
| Kingslee Farming Limited | Agriculture & fishing | 2024 |
| Kingslee Investments Limited | Financial services | 2016 |
| Kinsey Property Group Ltd | Real estate | 2026 |
| Kirsteen ROE Ltd | Professional & scientific | 2023 |
| Kiss Bandito Ltd | Wholesale & retail | 2017 |
| Kiss Business Consultancy Limited | Administrative & support | 2003 |
| KJW Assets Ltd | Professional & scientific | 2015 |
| KM Gynaecology Limited | Health & social care | 2023 |
| KMB Cheshire Limited | Real estate | 2019 |
| KMT Farming & Consultancy Limited | Professional & scientific | 2013 |
| Knolton Designs Limited | Professional & scientific | 2022 |
| Knolton Hall Limited | Agriculture & fishing | 2016 |
| Knutsford Stud & Equestrian Services Limited | Real estate | 2022 |
| Koolrock Limited | Real estate | 2021 |
| Kornerstone Consulting Limited | Health & social care | 2025 |
| Kpjj Investments Limited | Real estate | 2025 |
| Kppropertycare Ltd | Construction | 2023 |
| KVA Properties Limited | Construction | 2001 |
| KW and Others Holdings Ltd | Financial services | 2024 |
| Kylda Ltd | Professional & scientific | 2025 |
| L & H Auto Refurb Limited | Construction | 2016 |
| L J H Plant Hire Limited | Administrative & support | 2015 |
| L&M Parkin Property Ltd | Real estate | 2025 |
| LA Dolce Vita - Pasticceria Homemade Ltd | Manufacturing | 2023 |