| Jackson's Quality Shoe Repairs Ltd | Other services | 2013 |
| Jahbless Property Limited | Real estate | 2017 |
| Jahid ALI Ltd | Financial services | 2018 |
| JAI Halesi Ltd | Hospitality | 2019 |
| Janer Consulting Ltd | Professional & scientific | 2021 |
| Janfast Limited | Professional & scientific | 2023 |
| Jayla-Tech Ltd | Information & communication | 2012 |
| Jdfs Coaching Limited | Education | 2022 |
| Jeffries Plumbing Services Limited | Construction | 2011 |
| Jeya Trading Ltd | Wholesale & retail | 2022 |
| Jeyapro Ltd | Information & communication | 2021 |
| JGH Plumbing & Heating Ltd | Construction | 2025 |
| Jinks London Limited | Construction | 2025 |
| JJ Construction (UK) Limited | Construction | 2012 |
| JJK & Associates Limited | Professional & scientific | 2005 |
| JL Industrial Furniture Limited | Professional & scientific | 2013 |
| JM & K Accountancy Services Ltd | Professional & scientific | 2013 |
| JM French Polishing Ltd | Construction | 2023 |
| JM Team Consulting Ltd | Information & communication | 2026 |
| JMC Garden Maintenance Ltd | Administrative & support | 2024 |
| JMR Carpentry & Construction Ltd | Manufacturing | 2021 |
| Joate Limited | Real estate | 2026 |
| Jolly Frog Books Ltd | Wholesale & retail | 2026 |
| JON Daly Photography Ltd | Information & communication | 2015 |
| Josham Ltd | Other services | 2024 |
| JPS Golden Key Properties Ltd | Real estate | 2025 |
| Jptll Limited | Professional & scientific | 2021 |
| JR Workshop Ltd | Wholesale & retail | 2018 |
| JRC Talent Consultancy Limited | Professional & scientific | 2025 |
| JS Property NO1 Limited | Real estate | 2025 |
| JSC Accountancy Limited | Professional & scientific | 2014 |
| JTL Capital Properties Limited | Real estate | 2025 |
| Jubichem Limited | Wholesale & retail | 1973 |
| JW Systems Surrey Limited | Information & communication | 2009 |
| JWD Development Consultancy Limited | Professional & scientific | 2011 |
| K Custom PPF Ltd | Wholesale & retail | 2023 |
| K-C Equipment Finance LP | | 1999 |
| K2 Engineering (Cooling) Limited | Construction | 2005 |
| KA AM Property Limited | Real estate | 2025 |
| Kadado Construction Limited | Construction | 2025 |
| Karolann Solutions Ltd | Information & communication | 2018 |
| KD People Consulting Ltd | Administrative & support | 2025 |
| Kebbell Scaffolding Ltd | Construction | 2026 |
| Keeling Consulting Ltd | Professional & scientific | 2021 |
| Keeling Investment Properties Ltd | Real estate | 2018 |
| Kenjaro Finance Trading Company Limited | Real estate | 1972 |
| Kennedys Lettings Ltd | Real estate | 2014 |
| Kennedys Residential Ltd | Real estate | 2014 |
| Kenton Electronics Limited | Manufacturing | 1994 |
| Kevin William Peare & Sons Limited | Construction | 2024 |
| KHK Design Ltd | Professional & scientific | 2013 |
| Kidbrooke Education Ltd | Real estate | 2026 |
| Killasser Court Management Company Limited | Households | 1962 |
| Kimberly - Clark Limited | Manufacturing | 1935 |
| Kimberly-Clark Atlantic Holding Limited | Manufacturing | 2016 |
| Kimberly-Clark Emea Holdings Ltd | Manufacturing | 2016 |
| Kimberly-Clark Europe Limited | Manufacturing | 2000 |
| Kimberly-Clark European Services Limited | Financial services | 2000 |
| Kimberly-Clark Finance Limited | Financial services | 1951 |
| Kimberly-Clark Holding Limited | Other services | 1985 |
| Kimberly-Clark Intercontinental Holding Limited | Manufacturing | 2016 |
| Kimberly-Clark International Holding Limited | Manufacturing | 2014 |
| Kimberly-Clark Pension Trusts Limited | Financial services | 1965 |
| Kimberly-Clark Personal Care UK Limited | Manufacturing | 2025 |
| Kimberly-Clark U.K. Operations Limited | Administrative & support | 2002 |
| Kincress Associates Limited | Professional & scientific | 2014 |
| Kingman Services Limited | Transport & logistics | 2006 |
| Kings Cleaning Services Limited | Administrative & support | 2019 |
| Kingsway Heating & Bathrooms Limited | Construction | 2019 |
| Kingswood Clinic Ltd | Other services | 2020 |
| Kingswood Heritage Company Limited | Households | 2020 |
| Kingswood Lawn Tennis Club Limited(The) | Arts & recreation | 1925 |
| Kingswood Medical Limited | Health & social care | 2006 |
| Kingswood Village Convenience Store Ltd | Wholesale & retail | 2021 |
| Kingsworthy Management Company Limited | Households | 2014 |
| KLS in. Digital Limited | Professional & scientific | 2025 |
| Kmcc Limited | Wholesale & retail | 1999 |
| KME Holdings Ltd | Professional & scientific | 2021 |
| KN Carpentry & Joinery Limited | Other services | 2021 |
| KNR Estates Ltd | Real estate | 2026 |
| KR and Partners Limited | Professional & scientific | 2023 |
| KT20 Bakehouse Ltd | Manufacturing | 2025 |
| KT20 Limited | Hospitality | 2020 |
| Kuber Consultancy Limited | Information & communication | 2014 |
| Kuhler & Co (Wealth Management) Limited | Extraterritorial | 2014 |
| Kuhlers LLP | | 2021 |
| L G R and Glazing Ltd | Administrative & support | 2017 |
| L J Decorating Limited | Construction | 2022 |
| L P H Flooring Ltd | Construction | 2015 |
| L Wood-Murray Ltd | Professional & scientific | 2022 |
| L3 Services Ltd | Construction | 2023 |
| LA Peonia Catering Limited | Hospitality | 2025 |
| Lancaster Mews (Tadworth Park) Limited | Households | 1987 |
| Lancie Properties Ltd | Real estate | 2022 |
| Laurel BI Consulting Limited | Information & communication | 2016 |
| Law Consultancy Services Limited | Information & communication | 1981 |
| Lawntower Limited | Real estate | 2006 |
| Lcbg Property Ltd | Real estate | 2022 |
| Lcra Ltd | Households | 2015 |
| LDN Passive Fire Solutions Ltd | Construction | 2025 |