| Jutomo Ltd | Real estate | 2021 |
| JW Financial Limited | Financial services | 2017 |
| JW Philanthropy Limited | Professional & scientific | 2014 |
| Jwright Estates Ltd | Construction | 2024 |
| K & M Trade Windows Limited | Construction | 2020 |
| K D Paine & Associates Ltd | Professional & scientific | 2006 |
| K G Plumbing & Heating Services Limited | Construction | 2019 |
| K J Dahr Limited | Construction | 2013 |
| K L Coffee Ltd | Hospitality | 2017 |
| K R Construction (Sussex) Limited | Construction | 2019 |
| K Richard Locums Limited | Health & social care | 2019 |
| K S & J Garcha Properties Ltd | Real estate | 2017 |
| K T Financial Consultants Ltd. | Financial services | 2012 |
| K W Flooring Sussex Limited | Construction | 2022 |
| K W Grounds Maintenance & Property Services Ltd | Administrative & support | 2015 |
| K Witham Training Limited | Professional & scientific | 2010 |
| K.Mccabe Limited | Construction | 2023 |
| K2 (Eynsham) Limited | Real estate | 2022 |
| K2 Lettings Limited | Real estate | 2014 |
| K66 Boardriders Limited | Arts & recreation | 2019 |
| K96 Lifestyle Limited | Professional & scientific | 2025 |
| Kaddy Box Ltd | Transport & logistics | 2021 |
| Kafts Limited | Manufacturing | 2019 |
| Kallent Ltd | Administrative & support | 2020 |
| Kamyen Limited | Professional & scientific | 2014 |
| Kanlow Ltd | Information & communication | 2026 |
| Kannan Spicy Ltd | Hospitality | 2025 |
| Kanndir Design Limited | Professional & scientific | 2023 |
| Kappa Solutions Limited | Information & communication | 1995 |
| Karakas Property Ltd | Real estate | 2025 |
| Kardinal Healthcare Limited | Health & social care | 2007 |
| Kardinal Independent Living Ltd | Wholesale & retail | 2014 |
| Kardinal Training Limited | Education | 2018 |
| Karlina Limited | Professional & scientific | 2018 |
| Karose Consult Ltd | Professional & scientific | 2025 |
| Kasma Property Ltd | Real estate | 2020 |
| Kaspas Fareham Limited | Hospitality | 2019 |
| Katapult Consulting Limited | Administrative & support | 2013 |
| Katch Swimwear Ltd | Extraterritorial | 2025 |
| Kate Mitchell Makeup Studio & Academy Limited | Other services | 2018 |
| Kate Murnane Limited | Professional & scientific | 2017 |
| Katherine Freeman Properties Limited | Real estate | 2021 |
| Katie Hendra Property Limited | Real estate | 2024 |
| Katrina Hospitality Ltd | Hospitality | 2026 |
| Katsamba Limited | Health & social care | 2013 |
| KAU Solutions Limited | Information & communication | 2015 |
| KB Aviation Limited | Manufacturing | 2011 |
| Kbgl Limited | Extraterritorial | 2014 |
| KBS Electrical Contractors Ltd | Construction | 2018 |
| KC Compliance Solutions Ltd | Professional & scientific | 2014 |
| KC IP Optical Limited | Wholesale & retail | 2025 |
| KC Media Limited | Information & communication | 2011 |
| KC Parkland Limited | Real estate | 1998 |
| KCM DRY Construction Limited | Administrative & support | 2001 |
| KCR Therapy Rooms Ltd | Real estate | 2021 |
| KCS Global Consultancy Services Limited | Administrative & support | 2021 |
| KDS Property Networks Ltd | Real estate | 2020 |
| Keane Carrickmore Limited | Manufacturing | 1996 |
| Keen Companies Ltd | Financial services | 2022 |
| Keenos Energy and Environmental Services Ltd | Professional & scientific | 2019 |
| Keep Boutique Limited | Wholesale & retail | 2023 |
| Keith Bellenie & Co Ltd | Professional & scientific | 2017 |
| Keith Evans Developments Limited | Construction | 2004 |
| Keith Tang Limited | Professional & scientific | 2026 |
| Kellstan Limited | Administrative & support | 2009 |
| Kellstan Properties LLP | | 2012 |
| Kelly Property Group Ltd | Real estate | 2021 |
| Kempharma Ltd | Health & social care | 2014 |
| Kempson & Beck Limited | Wholesale & retail | 1997 |
| Kemptown Brewery Ltd | Manufacturing | 2014 |
| Kemtek Chemicals Ltd | Manufacturing | 2025 |
| Kencass Holdings Ltd | Financial services | 2025 |
| Kendal & Carrott Ltd. | Information & communication | 2013 |
| Kendall Consultants Limited | Professional & scientific | 2006 |
| Kendricks Holdings Limited | Wholesale & retail | 1986 |
| Kenilworth Studios Ltd | Information & communication | 2025 |
| Kennard Home Developments Limited | Construction | 2014 |
| Kennedy Cashmere Ltd | Wholesale & retail | 2021 |
| Kennedy Consultancy Services Ltd | Information & communication | 2026 |
| Kennedy Digital Limited | Administrative & support | 2011 |
| Kent Surrey Sussex Ahsn Limited | Health & social care | 2014 |
| Kernel Acumen Ltd | Professional & scientific | 2025 |
| Kerr Security Solutions Limited | Administrative & support | 2018 |
| Ketchenking Ltd | Other services | 2016 |
| Kett Cosmetics Ltd | Extraterritorial | 2013 |
| Kevin Curran Associates Limited | Professional & scientific | 2009 |
| Kevin Keatley Limited | Manufacturing | 2005 |
| Kevin Wheelhouse Consulting Limited | Professional & scientific | 2015 |
| KEW Housing Limited | Hospitality | 2024 |
| Keysforsuccess Ltd. | Professional & scientific | 2001 |
| Keystone Industries Limited | Financial services | 2018 |
| Keysway Limited | Information & communication | 2006 |
| Keythemes Limited | Financial services | 2025 |
| KF Dimensions Ltd | Public administration | 2023 |
| Kfvip Limited | Administrative & support | 2022 |
| KG Brod Ltd | Wholesale & retail | 2022 |
| KG Pharmaconsulting Ltd | Professional & scientific | 2014 |
| KH Property Investors Ltd | Hospitality | 2024 |
| Khops Hairdressing Limited | Other services | 2012 |
| KHT Lettings Limited | Real estate | 2026 |