| KB Social Media Ltd | Information & communication | 2014 |
| Kbrignell Properties Ltd | Real estate | 2024 |
| KC Learning & Development Ltd. | Other services | 2012 |
| Kcf-Af Ltd | Financial services | 2026 |
| KCN Management Services Limited | Information & communication | 2023 |
| KCN Property Management Limited | Professional & scientific | 2026 |
| KCQ Management Ltd | Real estate | 2019 |
| KCR Loft Conversions Ltd | Construction | 2023 |
| KCS Logistics Services Limited | Transport & logistics | 2024 |
| KCS Projects and Security Limited | Administrative & support | 2021 |
| KCW Windows Ltd | Manufacturing | 2009 |
| KD Electrical Contracting Limited | Construction | 2014 |
| KD Properties Investors Limited | Real estate | 2023 |
| KDK Consulting (UK) Ltd | Information & communication | 2007 |
| KDS Wealth Management Ltd | Financial services | 2015 |
| KDW Group Ltd | Professional & scientific | 2022 |
| Keane & Gray Ltd | Professional & scientific | 2019 |
| Kearney & Associates Limited | Professional & scientific | 2017 |
| Kedzierski Ltd | Manufacturing | 2026 |
| Keegan Electrical Ltd | Construction | 2018 |
| Keel Consulting Limited | Professional & scientific | 2026 |
| Keely Armitt Business Management Ltd | Administrative & support | 2025 |
| Keep IT Simple Marketing Solutions Limited | Administrative & support | 2022 |
| Keithdoyleroofing Ltd | Construction | 2025 |
| Keizer Locum Limited | Health & social care | 2024 |
| Kelchner Ltd | Manufacturing | 2017 |
| Kelevra Limited | Manufacturing | 2025 |
| Kellie Marsh Management Ltd | Real estate | 2020 |
| Kelly Hiney Ltd | Arts & recreation | 2023 |
| Kelly's Investments Limited | Real estate | 2019 |
| Kelly's MMA Ltd | Arts & recreation | 2025 |
| Kelly's Property Management Limited | Real estate | 2020 |
| Kemplan Limited | Agriculture & fishing | 2019 |
| Kempower Charging Limited | Wholesale & retail | 2021 |
| Kemppi (U.K.) Limited | Wholesale & retail | 1967 |
| Kempston Automotive Ltd | Wholesale & retail | 2025 |
| Kempston Building Services Limited | Construction | 2016 |
| Kempston Business Park Management Company Limited | Households | 1989 |
| Kempston Carpets Limited | Wholesale & retail | 2015 |
| Kempston Chef Limited | Hospitality | 2018 |
| Kempston Construction Limited | | 1979 |
| Kempston Garage Ltd | Wholesale & retail | 2023 |
| Kempston Hammers Sports & Social Club Limited | Arts & recreation | 2001 |
| Kempston Home Improvements Limited | Extraterritorial | 2017 |
| Kempston Hospitality Ltd | Hospitality | 2023 |
| Kempston Invest Ltd | Real estate | 2020 |
| Kempston Kebab & Grill House Ltd | Hospitality | 2026 |
| Kempston News Limited | Wholesale & retail | 2016 |
| Kempston Park Indoor Bowls Club Limited | Arts & recreation | 2014 |
| Kempston Road Flat Management Company Limited | Hospitality | 2012 |
| Kempston Rovers Sundays Ltd | Arts & recreation | 2024 |
| Kempston Rovers Trading Limited | Arts & recreation | 2018 |
| Kempston Scaffolding Services Ltd | Construction | 2002 |
| Kempston Traditional Joinery Limited | Manufacturing | 2002 |
| Kempston Windows Limited | Construction | 2013 |
| Kemsline Ltd | Health & social care | 2025 |
| KEN Pharma Limited | Manufacturing | 2021 |
| Kendall Contracts Limited | Construction | 1999 |
| Kennedy & Co. Group Limited | Professional & scientific | 2024 |
| Kensington Gardens Bedford Limited | Households | 2021 |
| Kensington Maintenance Ltd | Construction | 2025 |
| Kensington Video Productions Ltd | Information & communication | 2025 |
| Keopsoft Limited | Information & communication | 2018 |
| KEP Lifts Ltd | Administrative & support | 2012 |
| Kepa Care Ltd | Health & social care | 2024 |
| Kerala Foods UK Ltd | Wholesale & retail | 2020 |
| Kere Holdings Ltd | Real estate | 2025 |
| Kere Network Solutions Ltd | Information & communication | 2014 |
| Kermez Property Partners Ltd | Real estate | 2017 |
| Kernic Construction Limited | Construction | 2014 |
| Kesa Estate Management Ltd | Real estate | 2025 |
| Kesgrove Limited | Wholesale & retail | 2010 |
| Keshcon Ltd | Information & communication | 2019 |
| Kestrel Forestry Limited | Agriculture & fishing | 2022 |
| Kestrel Marketing Limited | Wholesale & retail | 2008 |
| Ketra Software Limited | Information & communication | 2022 |
| Kettering Energy II Limited | Energy | 2017 |
| Kettering Energy Limited | Energy | 2017 |
| Kettleby Holdings Limited | Extraterritorial | 2015 |
| Kevin Simms Carpentry and Building Limited | Construction | 2009 |
| Kevindouglasroberts Ltd | Extraterritorial | 2025 |
| Kevinrobertslabour Ltd | Extraterritorial | 2024 |
| Key Cars (Bedford) Ltd | Transport & logistics | 2011 |
| Key Compliancy Ltd | Information & communication | 2024 |
| Key Inform Consultancy Ltd | Professional & scientific | 2014 |
| Key Medical Services Limited | Health & social care | 2016 |
| Key Property Services Bedford Ltd | Real estate | 2020 |
| Key to Learning at Home Ltd | Education | 2015 |
| Keyfront Property Management Limited | Professional & scientific | 1986 |
| Keyone's Limited | Hospitality | 2015 |
| Keyone's Market Harborough Ltd | Hospitality | 2023 |
| Keyone's Towcester Ltd | Hospitality | 2023 |
| Keyring Store Limited | Extraterritorial | 2008 |
| Keysoe Holdings Limited | Financial services | 2021 |
| Keysoe International Ltd | Arts & recreation | 2020 |
| Keyspace Estate Ltd | Real estate | 2026 |
| Keystone Fire Safety Limited | Other services | 2013 |
| Keyward Limited | Information & communication | 2022 |
| Kfara Limited | Education | 2024 |
| KG Cars Ltd | Wholesale & retail | 2016 |