| K&K Properties (H.W) Ltd | Construction | 2020 |
| K&M Global Consulting Services Ltd | Professional & scientific | 2023 |
| K&S Couriers Ltd | Transport & logistics | 2026 |
| K&S Ventures (Bucks) Ltd | Real estate | 2023 |
| K. Ridgway Plumbing & Heating Limited | Construction | 2019 |
| K. S. Garden Services Limited | Administrative & support | 2005 |
| K.4 Motors Ltd | Wholesale & retail | 2025 |
| K.A.K. Consultancy Services Ltd. | Professional & scientific | 2023 |
| K.A.M. Traders Limited | Wholesale & retail | 2012 |
| K.M Bridges Academy C.I.C. | Education | 2024 |
| K1 Hairdresser Ltd | Other services | 2022 |
| K2 IT Technologies Limited | Information & communication | 2011 |
| K2K Sustainable@Ai Ltd | Wholesale & retail | 2019 |
| K5C Ltd | Manufacturing | 2023 |
| K5KITCHENS Ltd | Manufacturing | 2022 |
| KA2MA Ltd | Education | 2022 |
| KA8 Ltd | Real estate | 2020 |
| Kaboo Ltd | Wholesale & retail | 2025 |
| Kahn Air Limited | Manufacturing | 2015 |
| Kaidos Limited | Professional & scientific | 2012 |
| Kaira's Gutters Ltd | Administrative & support | 2025 |
| Kairo Security Ltd | Administrative & support | 2021 |
| Kaizens Group PVT Ltd | Information & communication | 2023 |
| Kaizens International Ltd | Information & communication | 2025 |
| KAL Sales Ltd | Administrative & support | 2012 |
| Kalla Films Limited | Information & communication | 2026 |
| KAM Distribution Ltd | Water & waste | 2026 |
| KAM Health Consultants Limited | Health & social care | 2025 |
| KAM Logistic Limited | Water & waste | 2026 |
| KAM Retail Investments Ltd | Real estate | 2021 |
| Kamaljot Research Limited | Professional & scientific | 2013 |
| Kamiion Ltd | Professional & scientific | 2014 |
| KAN Sales Ltd | Wholesale & retail | 2025 |
| Kandale Limited | Health & social care | 2022 |
| Kandk SB Ltd | Real estate | 2024 |
| Kandy Estates Ltd | Real estate | 2021 |
| Kandya Limited | Administrative & support | 2005 |
| Kane Poulter Talent Solutions Ltd | Administrative & support | 2024 |
| Kanj Accountancy Ltd | Professional & scientific | 2015 |
| Kann Foot Surgery Limited | Health & social care | 2016 |
| Kanuka Limited | Public administration | 2024 |
| Kanzi-Kibera Friends Ltd | Education | 2007 |
| Kapital Holdings Ltd | Real estate | 2025 |
| Kapow Drinks Ltd | Manufacturing | 2024 |
| Kapralogy Limited | Wholesale & retail | 2025 |
| Kapz Limited | Wholesale & retail | 2019 |
| Karen Cares Limited | Health & social care | 2021 |
| Karim's Estate Limited | Real estate | 2022 |
| Karim's Properties Limited | Real estate | 2022 |
| Karl's Handyman Services Ltd | Water & waste | 2026 |
| Karoly Cleaning Ltd | Administrative & support | 2016 |
| Karpinski Ltd | Arts & recreation | 2010 |
| Kart Components (Manufacturing) Limited | Manufacturing | 1998 |
| Kart Components (Plant Hire) Limited | Administrative & support | 2002 |
| Karunalaya Ltd | Other services | 2015 |
| Kashmir Halal Meat Ltd | Wholesale & retail | 2022 |
| Kashmir Spice Limited | Hospitality | 2020 |
| Kataclinika Limited | Information & communication | 2003 |
| Kate & Mike Limited | Professional & scientific | 2018 |
| Katlas Products Ltd | Wholesale & retail | 2023 |
| Kavithani Infotech Services Limited | Information & communication | 2016 |
| Kavithani Properties Limited | Real estate | 2022 |
| Kayani Three Ltd | Hospitality | 2026 |
| Kayani Two Ltd | Wholesale & retail | 2024 |
| Kayani'Ss Ltd | Wholesale & retail | 2022 |
| Kayanis One Ltd | Wholesale & retail | 2024 |
| Kayanis Restaurants Ltd | Hospitality | 2020 |
| Kaydeep Ltd | Wholesale & retail | 2024 |
| Kays Best Ltd | Professional & scientific | 2024 |
| Kazi Bari (London) LLP | | 2024 |
| Kazim Online Mart Ltd | Wholesale & retail | 2024 |
| KB Property Innovation Ltd | Real estate | 2025 |
| KB Recruitment Ltd | Administrative & support | 2024 |
| KB Ventilation Limited | Construction | 2025 |
| KBR22 Holdings Ltd | Real estate | 2022 |
| KBS Lighting Limited | Information & communication | 2014 |
| KC Service Specialist Ltd | Wholesale & retail | 2024 |
| Kcmj LLP | | 2018 |
| Kconsultingmf Ltd | Information & communication | 2020 |
| KCR Consultancy Limited | Construction | 2024 |
| Kcube Limited | Information & communication | 2023 |
| Kdam Food Distribution Ltd | Wholesale & retail | 2014 |
| KDK Builders Ltd | Construction | 2021 |
| Keating Holdings Limited | Real estate | 2021 |
| Kebabi Grill Ltd | Hospitality | 2023 |
| Keegan White Limited | Real estate | 2015 |
| Keepers Cottage (HG) Ltd. | Real estate | 2018 |
| KEEPINGBOOKS4U Ltd | Professional & scientific | 2013 |
| Keighills Ltd | Real estate | 2021 |
| Kejojan Travels and Tours Ltd | Administrative & support | 2024 |
| Keliwa Ltd | Hospitality | 2020 |
| Kellergreen Ltd | Administrative & support | 2012 |
| Kellett AI Ltd | Professional & scientific | 2024 |
| Kelly & King Associates Ltd | Professional & scientific | 2000 |
| Kelly & Louise Hair Design Ltd | Other services | 2018 |
| Kelly Marshall Limited | Professional & scientific | 2021 |
| Kelly Retail Limited | Wholesale & retail | 2013 |
| Kelly's EYE Limited | Arts & recreation | 1983 |
| Keltz-Templar Ltd | Professional & scientific | 2024 |
| KEM & Co Ltd | Wholesale & retail | 2025 |