| Khanivore Ltd | Transport & logistics | 2024 |
| Khanz Courier Services Ltd | Transport & logistics | 2025 |
| Khayati Limited | Financial services | 2023 |
| Khconnect Ltd | Information & communication | 2018 |
| Kheldent Limited | Health & social care | 2018 |
| Khen Services Ltd | Other services | 2023 |
| Khizar Enterprises Ltd | Wholesale & retail | 2025 |
| Khizr Studio Ltd | Manufacturing | 2022 |
| KHK Enterprise Limited | Real estate | 2019 |
| Khloris Properties Ltd | Real estate | 2020 |
| Kholyo Cars Ltd | Transport & logistics | 2023 |
| Khrelectronics Ltd | Wholesale & retail | 2025 |
| KHX Services Ltd | Administrative & support | 2015 |
| Khyim Properties Ltd | Real estate | 2026 |
| KHZ Enterprise Limited | Hospitality | 2024 |
| Ki-Ec Ltd | Information & communication | 2009 |
| Kiambu Enterprises Ltd | Transport & logistics | 2020 |
| Kickin' Cuts Limited | Information & communication | 2008 |
| Kidderminster Property Management 2 Ltd | Real estate | 2016 |
| Kidderminster Property Management Ltd | Real estate | 2016 |
| Kiddle Grounds Maintenance Limited | Administrative & support | 2016 |
| Kidney Research Enterprises Limited | Health & social care | 1994 |
| Kidney Research UK | Health & social care | 1967 |
| Kids Country Limited | Extraterritorial | 2012 |
| KIDS4FITNESS Limited | Administrative & support | 2017 |
| Kieran Arthur Holdings Limited | Financial services | 2026 |
| Kiind Souls Limited | Wholesale & retail | 2024 |
| Kiko Peterborough Ltd | Hospitality | 2022 |
| Kila Clothing Ltd | Wholesale & retail | 2024 |
| Kimad Consult Limited | Information & communication | 2015 |
| Kimbex Ltd | Health & social care | 2025 |
| Kimbolton Construction Limited | Wholesale & retail | 2006 |
| Kimpex Ltd | Construction | 2021 |
| Kims.Kitchen Ltd | Hospitality | 2026 |
| KIN Construction Ltd | Construction | 2016 |
| Kindle Scents Limited | Manufacturing | 2023 |
| Kindred Drama Consultancy Ltd | Arts & recreation | 2014 |
| Kindred Youth Theatre | Arts & recreation | 2016 |
| Kinetics Physio Ltd | Health & social care | 2026 |
| Kineton Residents Company Limited | Households | 2003 |
| King Bros (Lady Lodge) Limited | Wholesale & retail | 1976 |
| King Carz Limited | Transport & logistics | 2016 |
| King of Flooring Ltd | Construction | 2007 |
| King's Cliffe Heritage | Arts & recreation | 1999 |
| King's Cliffe Mortgage Services Ltd | Financial services | 2023 |
| King's-Delph United Limited | Arts & recreation | 2025 |
| Kingdom Carts Ltd | Wholesale & retail | 2022 |
| Kingdom Estate Agents Ltd | Real estate | 2024 |
| Kingfisher Commons Ltd | Professional & scientific | 2019 |
| Kingfisher Court (Huntingdon) Management Company Limited | Real estate | 2017 |
| Kings Cliffe and Area Community Sports Project Limited | Arts & recreation | 2006 |
| Kings Cliffe Community CIC | Arts & recreation | 2020 |
| Kings CUT Peterborough Ltd | Other services | 2025 |
| Kings Glorious Family Ltd | Wholesale & retail | 2025 |
| Kingsby Engineering Services Ltd | Professional & scientific | 2024 |
| Kingsgate Community Church | Other services | 2004 |
| Kingsgate Trading Limited | Wholesale & retail | 2007 |
| Kingship Clothing Ltd | Wholesale & retail | 2024 |
| Kingsland Close Management Limited | Real estate | 2018 |
| Kingsley Beverage Limited | Manufacturing | 2015 |
| Kingson Developments Limited | Real estate | 2018 |
| Kingston Park Hampton Management Company Limited | Real estate | 2015 |
| Kingston Signs Limited | Wholesale & retail | 2014 |
| Kingsway Land Development LLP | | 2014 |
| Kingswood House 101 Ltd | Real estate | 2021 |
| Kingswood House 102 Ltd | Real estate | 2021 |
| Kingswood House 501 Ltd | Real estate | 2021 |
| Kinsleys Convenience Limited | Wholesale & retail | 2015 |
| Kioya Light Ltd | Real estate | 2024 |
| KIP Mcgrath Tuition Peterborough LP | | 2019 |
| KIP Mcgrath Tuition Peterborough South LP | | 2019 |
| Kipps Properties Ltd | Real estate | 2021 |
| Kiran Property Ltd | Real estate | 2024 |
| Kirby & Wells Limited | Wholesale & retail | 1992 |
| Kirkgate Retail Holdings Limited | Financial services | 2024 |
| Kirkgate Retail Limited | Other services | 2012 |
| Kirkmore Ltd | Real estate | 2021 |
| Kirsten Munoz Ltd | Wholesale & retail | 2026 |
| Kirton (York Road) Residents Company Limited | Households | 2014 |
| Kirton in Lindsey Residents Company Limited | Households | 2003 |
| Kiss of Sun Tanning Ltd | Other services | 2025 |
| Kissamos Ltd | Hospitality | 2025 |
| Kitchen Clearance (UK) Ltd | Water & waste | 2011 |
| Kitchen Enterprises Ltd | Manufacturing | 2016 |
| Kitcreators.Com Ltd | Wholesale & retail | 2024 |
| Kitusam Limited | Wholesale & retail | 2025 |
| Kiwiski Investments Limited | Real estate | 2025 |
| Kizzy's Specialist Courier Ltd | Transport & logistics | 2019 |
| KJ & Co Services Ltd | Professional & scientific | 2025 |
| KJ Operational Management Services Limited | Public administration | 2023 |
| KJ Trans Services Limited | Transport & logistics | 2021 |
| KJB International AID Ltd | Professional & scientific | 2023 |
| KJS Print to Mail Services Limited | Manufacturing | 1998 |
| KK - Equines Ltd | Agriculture & fishing | 2020 |
| KK Kebab Ltd | Hospitality | 2026 |
| KK Transport Limited | Administrative & support | 2019 |
| KK Tyre & Haulage Services Ltd | Wholesale & retail | 2021 |
| Kkmr Ltd | Transport & logistics | 2014 |
| Kkpb Ltd | Hospitality | 2025 |
| KKW People Works Ltd | Professional & scientific | 2024 |