| Kidex Limited | Wholesale & retail | 2004 |
| Kids Care Zone Ltd | Wholesale & retail | 2025 |
| Kids Technology Education Ltd | Education | 2024 |
| Kidztivity Ltd | Other services | 2023 |
| Kieran Dermot Clancy Limited | Professional & scientific | 2017 |
| Kihon International Holdings Ltd | Financial services | 2024 |
| Kiing Ltd | Water & waste | 2017 |
| Killick Sailing Limited | Arts & recreation | 2016 |
| Kilmaine Consulting Limited | Information & communication | 2007 |
| Kilner Properties Limited | Real estate | 2016 |
| Kilo Media Ltd | Professional & scientific | 2024 |
| Kimazz Limited | Other services | 2015 |
| Kimber Ltd | Wholesale & retail | 2020 |
| Kimber Marine Flooring Limited | Construction | 2013 |
| Kimber Marine Limited | Manufacturing | 2010 |
| Kimberley Cole Marketing Ltd | Professional & scientific | 2020 |
| Kimbridge Trading Company Limited | Hospitality | 2016 |
| Kimtyre Limited | Manufacturing | 1987 |
| Kimura Limited | Hospitality | 2004 |
| KIN GS24 Limited | Construction | 2023 |
| Kinbrad Ltd | Wholesale & retail | 2025 |
| Kinch Properties Limited | Real estate | 2007 |
| Kind Foot Travels Ltd | Administrative & support | 2025 |
| Kind Industries Ltd | Other services | 2018 |
| Kindred United Ocean Development Culture Ltd | Transport & logistics | 2024 |
| Kindstay Limited | Information & communication | 2025 |
| Kinengco Limited | Administrative & support | 2002 |
| Kinetic Games Limited | Information & communication | 2020 |
| Kinetic Publishing Limited | Information & communication | 2026 |
| Kinetic Supplies Ltd | Wholesale & retail | 2022 |
| King & Tuke Limited | Administrative & support | 2010 |
| King Edward VI Preparatory School Ltd | Education | 1958 |
| King Edward VI School Southampton | Education | 2001 |
| King Property Developments Limited | Real estate | 2010 |
| King Trading Company Ltd | Wholesale & retail | 2020 |
| King's Community Church (Southampton) | Other services | 2007 |
| King's Edge Properties Limited | Real estate | 2003 |
| Kingdom Design Studio Ltd | Professional & scientific | 2025 |
| Kingdom Estates (New Forest) Ltd | Real estate | 2019 |
| Kingfisher Partners LLP | | 2015 |
| Kingpandey Limited | Financial services | 2017 |
| Kings Copse (Colden Common) Management Company Limited | Households | 2007 |
| Kings Copse Management Company Limited | Households | 2013 |
| Kings Park Developments Limited | Hospitality | 2022 |
| Kingsbridge House Lessees Limited | Households | 2017 |
| Kingsbridge House Management Limited | Real estate | 2015 |
| Kingsdown Property Services Ltd | Construction | 2023 |
| Kingsguard Security Services Ltd | Real estate | 2024 |
| Kingslake Cars Limited | Wholesale & retail | 2010 |
| Kingsland Tavern (ST Marys) Limited | Hospitality | 2025 |
| Kingsman Repairs Limited | Wholesale & retail | 2021 |
| Kingsmead Cars Limited | Wholesale & retail | 2015 |
| Kingstar Services Limited | Information & communication | 1998 |
| Kingston's Transport Ltd | Transport & logistics | 2023 |
| Kingsway Court (CF) Ltd | Households | 2001 |
| Kingswood (Hedge END) Limited | Real estate | 2016 |
| Kingswood Homes Management Ltd | Real estate | 2019 |
| Kingswood House Residents Association Limited | Real estate | 2014 |
| Kingswood Lane (Kings Worthy) Management Company Limited | Households | 2025 |
| Kingwood Thoroughbreds Limited | Agriculture & fishing | 2022 |
| Kinity Ltd | Information & communication | 2023 |
| Kinnair Investments Limited | | 1980 |
| Kinsebere Ltd | Administrative & support | 2025 |
| Kinship Keys Ltd | Real estate | 2023 |
| Kiri & Belle Limited | Manufacturing | 2020 |
| Kiri Golding Theatre Arts Ltd | Arts & recreation | 2025 |
| Kirkby Homes (Sunningdale) Limited | Real estate | 2013 |
| Kirkbymoorside Chief Ltd | Transport & logistics | 2015 |
| Kirkdown Limited | Professional & scientific | 2024 |
| Kirks Works Ltd | Wholesale & retail | 2024 |
| Kiron Limited | Professional & scientific | 2013 |
| Kirov Holdings Ltd | Real estate | 2020 |
| Kirpa Care Limited | Health & social care | 2024 |
| Kishkam Ltd | Hospitality | 2016 |
| Kiss Carpentry and Construction Ltd | Other services | 2016 |
| Kiss Tree Management Limited | Professional & scientific | 2009 |
| KIT Fitt Ltd | Construction | 2009 |
| KIT Inventory Solutions Ltd | Information & communication | 2024 |
| KIT Training Consultancy Limited | Information & communication | 2011 |
| Kit-Build Ltd | Construction | 2018 |
| Kitch Building Ltd | Construction | 2023 |
| Kitchen Kingdom Ltd | Hospitality | 2023 |
| Kitchen Living Group Ltd | Wholesale & retail | 2023 |
| Kitchen N Cafe Ltd | Hospitality | 2021 |
| Kitchen Quartz Worktops Ltd | Real estate | 2018 |
| Kitsch Ltd | Wholesale & retail | 2025 |
| Kitt Jones Limited | Other services | 2009 |
| Kiwi & Yuzu Ltd | Education | 2014 |
| Kiwi Audio Limited | Administrative & support | 2006 |
| Kiwi Care Ltd | Other services | 2010 |
| Kiyu Private Ltd | Hospitality | 2026 |
| KJ Cares Limited | Health & social care | 2024 |
| KJ Cleaning Contractors Limited | Professional & scientific | 2014 |
| KJ Horizons Ltd | Professional & scientific | 2022 |
| KJ Mortgage Specialists Ltd | Financial services | 2021 |
| KJ Property Projects Limited | Construction | 2003 |
| Kj's Mobility Limited | Wholesale & retail | 2014 |
| KJM Enterprises Limited | Financial services | 2018 |
| KJM HSE Consultancy Limited | Professional & scientific | 2014 |
| KJM Vision Ltd | Information & communication | 2021 |