| K2 Advisers Limited | Professional & scientific | 2024 |
| Kalo Group Limited | Professional & scientific | 2024 |
| Kambos Consulting Limited | Construction | 2015 |
| Karen Barham Limited | Professional & scientific | 2015 |
| Karen Mckeverne Ltd | Arts & recreation | 2026 |
| Kasak Ltd | Wholesale & retail | 2015 |
| Katalyst Performance Ltd | Professional & scientific | 2023 |
| Katy Bennett Art Ltd | Arts & recreation | 2022 |
| Kazi'Scleaners Limited | Administrative & support | 2016 |
| KCG Energy Ltd | Professional & scientific | 2021 |
| Kcorpez Ltd | Other services | 2014 |
| KD Event Production Limited | Administrative & support | 2003 |
| Kdtd Ltd | Professional & scientific | 2025 |
| Kealey Consulting Limited | Construction | 2009 |
| KEE Consulting Services Ltd | Professional & scientific | 2026 |
| Keep Enterprises Limited | Information & communication | 2021 |
| Kelro Ventures Limited | Arts & recreation | 2025 |
| Kenbar Beauty Products Limited | Wholesale & retail | 1992 |
| Kennedy Developments Limited | Construction | 2016 |
| Kenwood Property & Investment Co Limited | Construction | 2015 |
| Kersplat Ltd | Wholesale & retail | 2025 |
| Kevins Cafe Ltd | Hospitality | 2026 |
| Keystone Heritage Limited | Construction | 2022 |
| KI PAL Limited | Arts & recreation | 2017 |
| Kids Mini Mart Ltd | Wholesale & retail | 2023 |
| Kids Only Live Once Limited | Professional & scientific | 2012 |
| Kidzquest Ltd | Health & social care | 2024 |
| Kiicc Consulting Limited | Professional & scientific | 2026 |
| Kilgannon & Partners LLP | | 2018 |
| Kind Ventures Ltd | Professional & scientific | 2022 |
| Kindred Thing Ltd | Professional & scientific | 2025 |
| Kinell Consulting Limited | Information & communication | 2000 |
| Kinell Property Limited | Real estate | 2006 |
| Kinescope Ltd | Information & communication | 2020 |
| Kinetika Coaching Limited | Professional & scientific | 2024 |
| Kingsdowne Courier Services Limited | Transport & logistics | 2013 |
| Kirala Properties Ltd | Real estate | 2024 |
| Kirkby Battery Storage Ltd | Energy | 2021 |
| Kirkglen Associates Ltd | Professional & scientific | 2025 |
| KIT Properties Limited | Real estate | 2011 |
| KITCATS09 Limited | Real estate | 2019 |
| KITCATS10 Limited | Real estate | 2025 |
| Kitty Joyas Ltd | Manufacturing | 2022 |
| KIZMET40 Limited | Real estate | 2019 |
| KJB IT Services Limited | Information & communication | 2017 |
| Kjmillco Ltd | Construction | 2025 |
| Klaptocz Consultants Limited | Construction | 2000 |
| KLC Employment Law Consultants LLP | | 2006 |
| Klipdrift Holdings Limited | Real estate | 2016 |
| Knoesen Limited | Professional & scientific | 2021 |
| Knoll Road (Godalming) Management Limited | Households | 2015 |
| Kolo Enterprises Limited | Extraterritorial | 2006 |
| Komfi Rider Ltd | Manufacturing | 2025 |
| Koru Heating Limited | Construction | 2016 |
| Kosina Kosomi Ltd. | Professional & scientific | 2015 |
| KPB Nightingale Ltd | Wholesale & retail | 2020 |
| KPB Property Services Limited | Real estate | 2017 |
| Kristian Kiel UK Ltd | Wholesale & retail | 2012 |
| Krone-Z Ltd | Manufacturing | 2026 |
| Krumpit Limited | Hospitality | 2018 |
| Krypton Media Limited | Professional & scientific | 2025 |
| KSJ Parts Limited | Wholesale & retail | 2024 |
| Kuungana Advisory Limited | Professional & scientific | 2015 |
| KXN AI Ltd | Information & communication | 2026 |
| Kybo Groundwork Limited | Construction | 2005 |
| KYM Sanderson Consulting Limited | Professional & scientific | 2008 |
| L&N Holdings Limited | Real estate | 2018 |
| L'Octave Ltd | Wholesale & retail | 2023 |
| LA Costa Ltd | Real estate | 2023 |
| LA Fontaine Court Ltd | Real estate | 2018 |
| LA Hechicera Polo Ltd | Arts & recreation | 2025 |
| Ladles Kitchen Ltd | Hospitality | 2025 |
| Lake and Brown Roofing Limited | Construction | 2008 |
| Lalor Hurd Ltd | Wholesale & retail | 2023 |
| Lambeth Developments Limited | Real estate | 2014 |
| Lammas Gate Management Company Limited | Real estate | 1988 |
| LAN Support at Ltd | Administrative & support | 2009 |
| LAN Support CS Limited | Administrative & support | 2014 |
| LAN Support Limited | Information & communication | 2002 |
| LAN Support Systems Ltd | Information & communication | 2006 |
| Land Management 2.0 CIC | Professional & scientific | 2021 |
| Landcraft Landscape & Design Limited | Administrative & support | 2023 |
| Landings Management Company Limited(The) | Administrative & support | 1983 |
| Landmark House (Petersfield) Ltd | Construction | 2026 |
| Langford Finance Ltd | Financial services | 2026 |
| Langhorn Development Company Ltd | Real estate | 2017 |
| Langhurst Manor Development Limited | Construction | 2020 |
| Lansdown (Surrey) Limited | Construction | 2017 |
| Lansdown Grayshott Limited | Real estate | 2023 |
| Lansdown House Limited | Real estate | 2025 |
| Lansdown House Management Company Limited | Households | 2024 |
| Lansdown Property Hampshire Limited | Real estate | 2020 |
| Lansdown Property Limited | Real estate | 2019 |
| Lantern House Management Limited | Real estate | 1998 |
| Lantheus Radiopharmaceuticals UK Limited | Financial services | 2024 |
| Larch Studio Ltd | Professional & scientific | 2025 |
| Laura R Johnson Consulting Ltd | Professional & scientific | 2023 |
| Lauradale Properties Limited | Real estate | 1999 |
| Laurelwood Project Management Limited | Professional & scientific | 2011 |
| Laurent Residential Limited | Real estate | 1998 |