| Jude Engineering Limited | Manufacturing | 2014 |
| Judymila Health Care Ltd | Health & social care | 2023 |
| JUG Rock Records Ltd | Information & communication | 2012 |
| Jula Car Repairs Ltd | Wholesale & retail | 2017 |
| Julian R Ltd | Wholesale & retail | 2022 |
| Juliana Hair & Beauty Ltd | Other services | 2024 |
| Julija.Transport Ltd | Transport & logistics | 2019 |
| Jumphigh Entertainment Ltd | Hospitality | 2012 |
| Junipers Refreshments Limited | Wholesale & retail | 2025 |
| Juro Trans Ltd | Transport & logistics | 2016 |
| Jusdebols Limited | Health & social care | 2020 |
| Just Dumped Ltd | Other services | 2026 |
| Just First Transport Ltd | Transport & logistics | 2021 |
| Just in Time Freight & Logistics Ltd | Extraterritorial | 2024 |
| Justawesomecaresolutions Ltd | Health & social care | 2020 |
| Justbrit Music Ltd | Information & communication | 2019 |
| JW Protouch Ltd | Manufacturing | 2025 |
| JZ Ohara Ltd | Wholesale & retail | 2023 |
| K & F Finishes Limited | Other services | 2019 |
| K Fried Chicken Ltd | Hospitality | 2023 |
| K Livsey EP Ltd | Education | 2021 |
| K Ward Electrical Ltd | Construction | 2025 |
| K&K Solutions Ltd | Professional & scientific | 2018 |
| K.A.L Plumbing and Heating Limited | Construction | 2022 |
| K.Gray Plumbing and Heating Engineers Limited | Real estate | 1972 |
| K.Smith Accountancy Services Ltd | Professional & scientific | 2025 |
| K3 Multiservices Group Ltd | Real estate | 2018 |
| KA Holding Group Ltd | Financial services | 2024 |
| KA Property Assets Ltd | Real estate | 2024 |
| KA Property Sourcing Ltd | Real estate | 2024 |
| KA Property Stays Ltd | Real estate | 2023 |
| KAM Integrated Services Limited | Transport & logistics | 2017 |
| Kamaro Ltd | Transport & logistics | 2015 |
| Kamil Security Ltd | Administrative & support | 2024 |
| Kanda Print Midlands Limited | Manufacturing | 2015 |
| Kandar Properties Ltd | Real estate | 2022 |
| Kanoos Care Ltd | Public administration | 2023 |
| Kapsan IT Solutions Ltd | Information & communication | 2026 |
| Kasprowski Limited | Transport & logistics | 2015 |
| Kastan Holdings Ltd | Financial services | 2023 |
| Katalinobreja Ltd | Wholesale & retail | 2024 |
| Katso Ltd | Transport & logistics | 2018 |
| Katz Indigo Ltd | Information & communication | 2023 |
| Kayada Catering Ltd | Hospitality | 2024 |
| Kayfab Ltd. | Construction | 2014 |
| Kayj Ltd | Administrative & support | 2023 |
| Kazarka Limited | Real estate | 2006 |
| Kazivan Ltd | Information & communication | 2025 |
| KBR Tech Ltd | Information & communication | 2026 |
| KD (Worcester) Limited | Construction | 2025 |
| KEE Maintenance and Decorating Limited | Other services | 2024 |
| Keencut Limited | Manufacturing | 2015 |
| Keencut Technology Limited | Real estate | 1982 |
| Keepers Lodge Events Ltd | Hospitality | 2024 |
| Keiley Mccleaner Ltd | Administrative & support | 2024 |
| Kellant Properties Limited | Real estate | 2017 |
| Kellty Financial Services Limited | Administrative & support | 2026 |
| Kellty Limited | Wholesale & retail | 2025 |
| Kelsar Limited | Real estate | 2012 |
| Kempton Accountancy Services Limited | Professional & scientific | 2013 |
| Kenneth Argo Limited | Financial services | 1986 |
| Kennyray Limited | Wholesale & retail | 2025 |
| Kerbcrete Limited | Construction | 2022 |
| Kesuth Ltd | Wholesale & retail | 2026 |
| Kevin Dent Footwear Agencies Limited | Wholesale & retail | 2015 |
| Key Packaging Machinery Limited | Wholesale & retail | 1999 |
| Keygen Automotive Limited | Wholesale & retail | 2025 |
| Kfmm FM Trans Ltd | Transport & logistics | 2024 |
| KG Reach Limited | Administrative & support | 2025 |
| Khaldare Ltd | Real estate | 2020 |
| Khea Services Ltd | Professional & scientific | 2025 |
| Khela Holdings Ltd | Professional & scientific | 2018 |
| Khuhan Retail Ltd | Wholesale & retail | 2025 |
| Kiad Enterprises Ltd | Manufacturing | 2012 |
| Kiap Ltd | Construction | 2026 |
| Kibo Services Ltd | Professional & scientific | 2016 |
| Killin IT Ltd | Extraterritorial | 2022 |
| Kimon Business Group Ltd | Hospitality | 2019 |
| Kingdom Ambassadors Consultancy Ltd | Professional & scientific | 2026 |
| Kingdom Developers Limited | Real estate | 2025 |
| Kingdom of Cosmetology Ltd | Wholesale & retail | 2022 |
| Kingsbrook Accounting and Tax Services Limited | Professional & scientific | 2018 |
| Kingsbrook Consultancy Limited | Professional & scientific | 2026 |
| Kingscliffe Homes Limited | Construction | 1999 |
| Kingswood Education Catering Ltd | Hospitality | 2013 |
| Kinyman 50 Limited | Extraterritorial | 2013 |
| Kipuka Ltd. | Professional & scientific | 2013 |
| Kite Property Ltd | Real estate | 2024 |
| Kitox Limited | Information & communication | 2012 |
| KJR Engineering Limited | Manufacturing | 2025 |
| Klaudiu Trans Limited | Transport & logistics | 2014 |
| KM Automotive Centre Limited | Wholesale & retail | 2023 |
| KM Vending Limited | Wholesale & retail | 2025 |
| KN Solutions Ltd | Construction | 2021 |
| Knights of Saint Thomas Ltd | Extraterritorial | 2025 |
| Knights of Saint Thomas of Canterbury Ltd | Extraterritorial | 2024 |
| Knipex Tools UK Limited | Wholesale & retail | 2018 |
| Knot NOW Limited | Manufacturing | 2024 |
| Kolchora Arts and Fashion Limited | Manufacturing | 2024 |
| Konda Mobile Valet Limited | Administrative & support | 2024 |