| K M Gilbert Limited | Financial services | 2013 |
| K M N Designs Limited | Professional & scientific | 2007 |
| K R D Store Limited | Wholesale & retail | 2021 |
| K W Cleaning Limited | Administrative & support | 2010 |
| K&G Roofing & Building Contractors Ltd | Construction | 2020 |
| K.E.J. Corporation Limited | Financial services | 2019 |
| K.S Support Services Ltd | Health & social care | 2025 |
| K2 Clothing Limited | Wholesale & retail | 2001 |
| K2 Wholesale Ltd | Wholesale & retail | 2026 |
| K2Z Consulting Construction Ltd | Professional & scientific | 2022 |
| K3 Recruitment Limited | Administrative & support | 2007 |
| KA Pharma Ltd | Wholesale & retail | 2023 |
| KAB Composites Ltd | Administrative & support | 2017 |
| Kaboodle South Ltd | Manufacturing | 2018 |
| Kadri Locums Ltd | Health & social care | 2018 |
| Kagenterprise Ltd | Wholesale & retail | 2024 |
| Kain RGN Ltd | Health & social care | 2023 |
| Kaizen Advisory Ltd | Professional & scientific | 2024 |
| Kaizen Garden Rooms Ltd | Construction | 2025 |
| Kaizen Properties Limited | Real estate | 2015 |
| Kajaga Properties Ltd | Real estate | 2023 |
| Kajale Ltd | Other services | 2022 |
| Kakedcompany Limited | Wholesale & retail | 2025 |
| Kale Food Services Ltd | Hospitality | 2025 |
| Kalium Marketing Ltd | Professional & scientific | 2018 |
| Kalotec Limited | Professional & scientific | 2012 |
| KAM Mark Development (Juneda) Limited | Construction | 2023 |
| KAM Mark Development (SPV) Limited | Real estate | 2018 |
| KAM Mark Development Ltd | Real estate | 2017 |
| Kamicka Ltd | Hospitality | 2011 |
| Kamun Ltd | Construction | 2025 |
| Kangos Peri Peri Chicken Ltd | Extraterritorial | 2013 |
| Kansha Brands Limited | Wholesale & retail | 2016 |
| Kaplink Limited | Hospitality | 2024 |
| Karf Lighting Limited | Professional & scientific | 2021 |
| Kaseco Ltd | Real estate | 2021 |
| Kasnavia Services Limited | Health & social care | 2021 |
| KAT Holdings IOW Limited | Financial services | 2025 |
| Kat's Eyes Semi Permanent Makeup & Aesthetics Ltd | Other services | 2021 |
| Katanna Properties Letting and Management Limited | Households | 2025 |
| Katanna Properties Limited | Real estate | 2017 |
| Kathstone Ltd | Wholesale & retail | 2026 |
| Katies Companies Limited | Wholesale & retail | 2025 |
| Katinas DRY Lining Ltd | Construction | 2015 |
| Katyca Ltd | Transport & logistics | 2015 |
| Kauahita CC Limited | Health & social care | 2026 |
| Kauri Partners Limited | Real estate | 2014 |
| Kaves Limited | Wholesale & retail | 2016 |
| Kavirondobc Ltd | Health & social care | 2025 |
| Kayes Catering Ltd | Hospitality | 2026 |
| Kazani Consulting Ltd | Professional & scientific | 2025 |
| Kazi Healthcare Limited | Health & social care | 2013 |
| KBS Maritime Limited | Administrative & support | 2021 |
| Kcsgm Limited | Information & communication | 2017 |
| KCW Telecoms Ltd | Information & communication | 2018 |
| KD Axis Ltd | Health & social care | 2025 |
| KD Estate Management Limited | Real estate | 2025 |
| KDG Heating & Plumbing Services Ltd | Construction | 2023 |
| Kebab Kitchen Ltd | Hospitality | 2026 |
| Keep Calm and Sail on Ltd | Administrative & support | 2023 |
| Keith Banks Electrical Limited | Construction | 2014 |
| Keith Edward Lawrence Limited | Extraterritorial | 2022 |
| Keith Maslen Associates Limited | Professional & scientific | 2008 |
| Kelly Hotels Limited | Education | 2004 |
| Kelly Social Work Consultants Ltd | Health & social care | 2011 |
| Kelroke Limited | Real estate | 2025 |
| Kelsea Construction Ltd | Construction | 2019 |
| Kelsy Living Ltd | Real estate | 2017 |
| Kelsy Properties Limited | Real estate | 2022 |
| KEN Brown Boats Limited | Transport & logistics | 2002 |
| Kenat Ltd | Other services | 2026 |
| Kendal Lodge Limited | Households | 2011 |
| Kendalcourt Limited | Health & social care | 1999 |
| Kennectt Ltd | Wholesale & retail | 2022 |
| Kennef Properties Ltd | Real estate | 2025 |
| Kenroy Limited | Financial services | 2018 |
| Kens Balti House Limited | Extraterritorial | 2007 |
| Kens Fried Chicken Limited | Extraterritorial | 2002 |
| Kens Hairitage and Makeover Ltd | Other services | 2025 |
| Kens Kebab Ltd | Extraterritorial | 2013 |
| Kens Kebabs Guildhall Ltd | Hospitality | 2013 |
| Kens Original Peri Peri Ltd | Professional & scientific | 2013 |
| Kens Peri Peri Chicken Ltd | Extraterritorial | 2013 |
| Kens Peri Peri Ltd | Professional & scientific | 2013 |
| Kens Portsmouth Limited | Extraterritorial | 2024 |
| Kens Southsea Limited | Extraterritorial | 2024 |
| Kensington Property Maintenance Ltd | Administrative & support | 2016 |
| Kent Tavern Developments Limited | Construction | 2015 |
| Kenwick Properties Limited | Administrative & support | 1997 |
| Kenya Children Centres | Health & social care | 2002 |
| Kenzin Limited | Information & communication | 2025 |
| Keppel's Head Hotel Limited | Extraterritorial | 2019 |
| Keramos Contracts Limited | Construction | 2023 |
| Kerley Builders Ltd | Construction | 2007 |
| Kestrel Court Limited | Construction | 2020 |
| Kevin Tibble Consulting Limited | Administrative & support | 2015 |
| Kevince Unique Ltd | Health & social care | 2025 |
| KEW Diving Services Ltd | Construction | 2020 |
| Key Brands International Ltd | Wholesale & retail | 2008 |
| Key Recruitment Limited | Administrative & support | 2000 |