| Kidney Specialists Ltd | Health & social care | 2019 |
| Kidplan App Ltd | Information & communication | 2025 |
| Kids About Tarn Ltd | Other services | 2016 |
| Kidun Ltd | Transport & logistics | 2026 |
| Kidz Come First C.I.C. | Education | 2018 |
| Kidz Come First Care C.I.C. | Health & social care | 2020 |
| Kidz Come First Mobile Childcare Ltd | Health & social care | 2026 |
| Kiely App Development Ltd | Information & communication | 2026 |
| Kientech Dental Laboratory Ltd | Health & social care | 2023 |
| Kierat IT Ltd | Administrative & support | 2016 |
| Kihja Ltd | Health & social care | 2026 |
| KII Digital Ltd | Administrative & support | 2023 |
| Kiids Vitamins Ltd | Extraterritorial | 2015 |
| Kiit and Deel Properties Ltd | Real estate | 2024 |
| Kiitchen & Bedrooms Limited | Construction | 2026 |
| Kijani Supplies Ltd | Financial services | 2023 |
| Kiki’S Local Eatery Ltd | Hospitality | 2025 |
| Kikwetu Kenyan Community Group Leeds CIC | Health & social care | 2024 |
| Kilbride Events Ltd | Hospitality | 2024 |
| Kilbride Goods Limited | Wholesale & retail | 2025 |
| Kilby Construction Services Limited | Professional & scientific | 2012 |
| Kilfrost Europe Ltd | Wholesale & retail | 2016 |
| Kili Ventures Ltd | Professional & scientific | 2024 |
| Kilimanjaro Spring Limited | Wholesale & retail | 2020 |
| Kilisa Ltd | Wholesale & retail | 2013 |
| Killa Hair & Beauty Limited | Other services | 2023 |
| Killead Management Services Ltd | Professional & scientific | 2018 |
| Killock (Property Developments) Limited | Real estate | 1973 |
| Kilmartin Plowman & Partners Limited | Professional & scientific | 1998 |
| Kilmorie Property Group Ltd | Real estate | 2024 |
| Kilmorie Property Ltd | Real estate | 2024 |
| Kilpin Developments Limited | Construction | 2025 |
| Kilvington Property Group Limited | Real estate | 2023 |
| Kilvingtons of Leeds Ltd | Transport & logistics | 2018 |
| KIM Care and Support Services Limited | Administrative & support | 2022 |
| Kim's Kiddiecare Limited | Education | 2018 |
| Kim-Joy Limited | Other services | 2018 |
| Kim-Joy's Kitchen Limited | Other services | 2018 |
| Kimberley Credit Management Limited | Professional & scientific | 2004 |
| Kimsfinds Ltd | Wholesale & retail | 2026 |
| KIN (BA) Properties Ltd | Hospitality | 2024 |
| KIN Couriers Ltd | Transport & logistics | 2025 |
| KIN Imaging Ltd | Health & social care | 2023 |
| KIN Property Partnership LLP | | 2022 |
| KIN Property Services Ltd | Real estate | 2021 |
| Kinalb Ltd | Education | 2025 |
| Kincaid Investments Ltd | Households | 2017 |
| Kincardine BEN Macdui Limited | Financial services | 2025 |
| Kinda Collective Ltd | Wholesale & retail | 2024 |
| Kinderkare Private Day Nursery Limited | Health & social care | 2005 |
| Kinderland Nursery Ltd | Administrative & support | 2019 |
| Kindex Healthcare Ltd | Health & social care | 2025 |
| Kindlora Care Limited | Health & social care | 2025 |
| Kindred Homes Limited | Construction | 2018 |
| Kindred Kapital Ltd | Health & social care | 2024 |
| Kindstone Properties Ltd | Real estate | 2025 |
| Kinetic Air Limited | Construction | 2011 |
| Kinetic Intelligence Ltd | Education | 2026 |
| Kinetic Internal Communications Ltd | Professional & scientific | 2019 |
| Kinetica (UK) Ltd | Administrative & support | 2003 |
| Kineticare Ltd | Administrative & support | 2019 |
| Kinetik Visual Solutions Ltd | Administrative & support | 2007 |
| King & Co Property Group Ltd | Construction | 2020 |
| King & SON Building Services Ltd | Construction | 2024 |
| King and Carr Limited | Administrative & support | 2023 |
| King Consulting Services Ltd | Information & communication | 2020 |
| King Lane Management Limited | Households | 1976 |
| King of the North Media Limited | Information & communication | 2015 |
| King Solo Ltd | Education | 2023 |
| King Tyres (Leeds) Ltd | Extraterritorial | 2015 |
| King's Barber Leeds Limited | Other services | 2022 |
| King's Handyman & Cleaning Service's Ltd | Administrative & support | 2024 |
| Kingdom Apartments Limited | Administrative & support | 2004 |
| Kingdom Gardens Limited | Real estate | 2006 |
| Kingdom School of Theology Ltd | Education | 2018 |
| Kingdom State Villas Limited | Real estate | 2001 |
| Kingdomzdoll Ltd | Information & communication | 2019 |
| Kingfisher (Lubrication) Trustees Limited | Administrative & support | 2020 |
| Kingfisher Dressage Ltd | Arts & recreation | 2017 |
| Kingfisher Electrical Limited | Construction | 2001 |
| Kingfisher Joinery and Carpentry Limited | Construction | 2025 |
| Kingfisher Mechanical Services Ltd | Agriculture & fishing | 2015 |
| Kingfisher Upvc Windows & Doors Limited | Manufacturing | 1990 |
| Kings & Co Leeds Ltd | Hospitality | 2024 |
| Kings & Queens Desserts Ltd | Hospitality | 2022 |
| Kings Building & Joinery Solutions Ltd | Construction | 2019 |
| Kings Court (Halifax) RTM Company Ltd | Households | 2012 |
| Kings Court (Hull) Management Company Limited | Households | 2006 |
| Kings Court (Leeds) Limited | Real estate | 1996 |
| Kings Court 2004 Management Company Limited | Real estate | 2004 |
| Kings Drive Residents Company Limited | Other services | 2000 |
| Kings Joinery Southern Limited | Construction | 2013 |
| Kings Real Estate Investments Ltd | Real estate | 2025 |
| Kings Road Residents Company (Bramhope) Limited | Real estate | 2000 |
| Kingsearch (Bradford) Limited | Wholesale & retail | 2017 |
| Kingsearch (Leeds) Limited | Wholesale & retail | 2017 |
| Kingsearch Limited | Wholesale & retail | 1987 |
| Kingsley Ewang Healthcare Resources Limited | Health & social care | 2018 |
| Kingsley Security Systems Limited | Administrative & support | 2003 |
| Kingsman Group Services Limited | Administrative & support | 2022 |