| Khalsa Staircase Ltd | Construction | 2022 |
| Khando Entertainment Ltd | Information & communication | 2010 |
| Khider Management Limited | Real estate | 2025 |
| Kiki Heston Road Limited | Real estate | 2025 |
| Kiki VFR Limited | Real estate | 2021 |
| Kiki Wembley Limited | Real estate | 2026 |
| Killigrew King Limited | Administrative & support | 2013 |
| Killowen Ltd | Arts & recreation | 2022 |
| Kim's Nail Salon Ltd | Real estate | 2018 |
| Kingada Properties Ltd | Real estate | 2020 |
| Kings & Pearls Ltd | Hospitality | 2023 |
| Kings Cosmetics Ltd. | Extraterritorial | 2013 |
| Kings Mews (Gerrards Cross) Management Company Limited | Households | 2019 |
| Kingsdown Business Solutions Ltd | Administrative & support | 2012 |
| Kingsdown Marketing Limited | Professional & scientific | 1993 |
| Kingswater Residents Association (Gerrards Cross) Limited | Households | 1991 |
| Kinnijd Limited | Health & social care | 2022 |
| Kinvara Associates Ltd | Professional & scientific | 2025 |
| Kirklinton Limited | Professional & scientific | 2015 |
| Kirosrecruit Ltd | Administrative & support | 2021 |
| Kivue Limited | Information & communication | 2013 |
| Kiwon Ltd | Wholesale & retail | 2018 |
| KJR Property Ltd | Real estate | 2017 |
| KJS Actuarial Limited | Professional & scientific | 2017 |
| KKS Property Investments Limited | Real estate | 2017 |
| Kleyn Ventures Limited | Professional & scientific | 2012 |
| Kmatl Holding Company Limited | Financial services | 2019 |
| KMB Growth Advisory Limited | Professional & scientific | 2026 |
| KMK Investments Limited | Real estate | 2019 |
| Knight Partners Consulting Ltd | Other services | 2022 |
| Knights Rest Consultancy Ltd | Professional & scientific | 2025 |
| Knss Associates Ltd | Real estate | 2025 |
| KOA Tails Ltd | Other services | 2021 |
| Koko Union Limited | Professional & scientific | 2002 |
| Kokosanemi GX Limited | Hospitality | 2025 |
| Kold Limited | Professional & scientific | 2021 |
| Koli's Plumbing and Heating Ltd | Construction | 2022 |
| Konnekt Konsulting Ltd | Information & communication | 2012 |
| Koya KO Limited | Hospitality | 2020 |
| KPC Mortgages Ltd | Financial services | 2017 |
| KPS Property Investments Ltd | Real estate | 2020 |
| Krestview Homes Limited | Construction | 2025 |
| KRP Consulting Limited | Professional & scientific | 2011 |
| Krystal Clarity Ltd | Information & communication | 2017 |
| KS Housing Limited | Real estate | 2021 |
| KS Management Ltd | Professional & scientific | 2021 |
| KSR 91 Ltd | Real estate | 2021 |
| KTJ Trading Ltd | Real estate | 2017 |
| Kultura Limited | Professional & scientific | 2019 |
| Kumar Enterprises Limited | Real estate | 2014 |
| Kvmd Ltd | Real estate | 2018 |
| L & J King Limited | Hospitality | 2003 |
| L a FOX Ltd | Professional & scientific | 2022 |
| L a Solutions (UK) Limited | Information & communication | 2002 |
| LA Picola Limited | Hospitality | 2025 |
| Ladoo Barfi Limited | Wholesale & retail | 2025 |
| Lainah Limited | Information & communication | 2021 |
| Lake View Propertes Ltd | Real estate | 2025 |
| Lamberhurst Properties Limited | Hospitality | 1994 |
| Lamos Properties Ltd | Real estate | 2024 |
| Lamoutte Limited | Financial services | 2023 |
| Landclan Limited | Information & communication | 2018 |
| Landim (LR) Limited | Construction | 2022 |
| Landlord Buyer Limited | Real estate | 2017 |
| Landmark (Holdings) Limited | Construction | 2012 |
| Landmark (Richmond Wood) Limited | Real estate | 2017 |
| Landmark Architectural Services Ltd | Professional & scientific | 2022 |
| Landmark Architecture and Planning Limited | Professional & scientific | 2016 |
| Landmark Construction (GX) Limited | Construction | 2023 |
| Landmark Consulting Services Limited | Professional & scientific | 2009 |
| Landmark DC Limited | Construction | 2019 |
| Landmark Fulmer Ridge Limited | Real estate | 2015 |
| Landmark Lakeside Limited | Construction | 2024 |
| Landmark Management (GX) Limited | Real estate | 2023 |
| Landmark Management and Consultancy Limited | Real estate | 2019 |
| Landmark Missenden Limited | Construction | 2026 |
| Landmark Property Ventures Ltd | Construction | 2010 |
| Landmark Slough Limited | Real estate | 2018 |
| Landmark Ventures (GX) Limited | Real estate | 2017 |
| Lane Accounting Limited | Professional & scientific | 2006 |
| Langland Lettings Ltd | Real estate | 2011 |
| Lansdown Road Ltd | Construction | 2025 |
| Larisa Catering Ltd | Wholesale & retail | 2019 |
| Laschf Limited | Other services | 2024 |
| Lash Investments Limited | Real estate | 2019 |
| Lasr Ltd | Construction | 2021 |
| Latchmoor Management (G.X.) Limited | Real estate | 1989 |
| Latchmore Place (G.X.) Limited | Households | 1998 |
| Late Breaks Ltd | Wholesale & retail | 2021 |
| Latitude Aviation Consulting & Management Services Limited | Professional & scientific | 2013 |
| Lauder Group | Professional & scientific | 2007 |
| Laughing Stock Limited | Financial services | 2005 |
| Laughing Stock Productions Limited | Information & communication | 1991 |
| Lauren FOX Consultancy Ltd | Professional & scientific | 2025 |
| Lawan Limited | Other services | 2024 |
| Lawbuilt Scenery Ltd | Manufacturing | 2025 |
| Lawrance Ventures Ltd | Financial services | 2012 |
| Lawtomation Ltd | Information & communication | 2015 |
| Laxmi Logistics Limited | Transport & logistics | 2024 |
| Layered Lounge Limited | Wholesale & retail | 2016 |