| J-Tek Installations UK Ltd. | Construction | 2013 |
| J.C.O Builders Ltd | Construction | 2019 |
| J.G. Brickworks Limited | Construction | 2009 |
| Jackdaw Advisory Ltd | Professional & scientific | 2025 |
| Jago International Ltd | Professional & scientific | 2018 |
| James Harper Polo Limited | Arts & recreation | 2005 |
| Jamie Nicholls Limited | Arts & recreation | 2012 |
| Janet Kent Dressmaking Limited | Other services | 2017 |
| Jannuss Partners Ltd | Administrative & support | 2023 |
| Japan Translate Limited | Professional & scientific | 2012 |
| JCI Protec Limited | Professional & scientific | 2007 |
| JDR Hair Limited | Other services | 2015 |
| JEB Construction & Property Development Limited | Construction | 2008 |
| JEM Marketing & Fulfilment Trustees Limited | Administrative & support | 2024 |
| Jessica Pybus Gardens Limited | Administrative & support | 2025 |
| JET Learning Systems Ltd | Information & communication | 2022 |
| Jethro Tanner Limited | Households | 2021 |
| JJC Accountants Limited | Professional & scientific | 2017 |
| JLR Property & Development Ltd | Real estate | 2025 |
| JMW Accounts Limited | Real estate | 2014 |
| John Handley Groundworks Limited | Construction | 2017 |
| Johnathan Hart Associates Limited | Professional & scientific | 1987 |
| Joiningthedots.Global Ltd | Professional & scientific | 2025 |
| Jubilate Services Ltd | Other services | 2026 |
| Junction Inc Ltd | Manufacturing | 2011 |
| Junni's Ltd | Hospitality | 2025 |
| JV Horseboxes Ltd | Wholesale & retail | 2021 |
| K. Lammas Plumbing and Heating Limited | Construction | 2005 |
| K.M.Care (LAT) Ltd | Health & social care | 2018 |
| K9 Development Centre Ltd | Other services | 2024 |
| KA Beauty Ltd | Wholesale & retail | 2021 |
| Kaylees Childrenswear Limited | Wholesale & retail | 2024 |
| KAZ Haircut Ltd | Other services | 2024 |
| KDB Autos Limited | Manufacturing | 2011 |
| Kebab Centre Limited | Hospitality | 2025 |
| Kensington Gardens Property Management Company Limited | Real estate | 2011 |
| Keppel House Residents Company Limited | Households | 1978 |
| Kerbside Tyre and Exhaust Ltd | Wholesale & retail | 2005 |
| Keybronze Limited | Hospitality | 1974 |
| Keystone Group Partners Ltd | Professional & scientific | 2025 |
| KFR Capital Limited | Financial services | 2025 |
| Kingfisher Associates Limited | Professional & scientific | 2003 |
| Kingfisher Building Supplies Limited | Wholesale & retail | 2008 |
| Kitchen George Limited | Wholesale & retail | 2006 |
| Kitti Kovacs Design Ltd | Construction | 2021 |
| Kitti Kovacs Water and Garden Ltd | Manufacturing | 2026 |
| Klaxon Communications Ltd | Professional & scientific | 2018 |
| KM Coaching & Development Ltd | Professional & scientific | 2011 |
| Knot Island Limited | Professional & scientific | 2020 |
| Knowle Lane Management Limited | Households | 1977 |
| Knowle Nursery School Limited | Education | 2013 |
| Konect Consultancy Ltd | Professional & scientific | 2024 |
| Kwik JET Limited | Water & waste | 1993 |
| L C L (2018) Limited | Real estate | 2018 |
| L H Garden Design Ltd. | Administrative & support | 2021 |
| L J Beauvois Carpentry & Joinery Ltd | Manufacturing | 2025 |
| L J Webber Ltd | Agriculture & fishing | 2019 |
| LA Sales Limited | Wholesale & retail | 2019 |
| Lake and River Maintenance Limited | Water & waste | 2019 |
| Lakeside Shack Limited | Hospitality | 2025 |
| Land & Castle Ltd | Real estate | 2026 |
| Lantern Care Services Limited | Health & social care | 2016 |
| Lapscombe Consulting Limited | Other services | 2020 |
| Larkfield Residents Association (Ewhurst) Limited | Households | 1993 |
| Leak Detecta Ltd | Construction | 2026 |
| Learning to Grow Consultants Ltd | Information & communication | 2025 |
| Ledmore Limited | Wholesale & retail | 2017 |
| Ledmore Propco Limited | Financial services | 2023 |
| LEE Robinson Construction Limited | Construction | 2017 |
| LEO Technick Ltd | Information & communication | 2016 |
| Lesley Anne Mitchell Ltd | Administrative & support | 2018 |
| Levitt Property Development Ltd | Construction | 2019 |
| LHD Maintenance Ltd | Other services | 2018 |
| Liberty Grove Limited | Real estate | 2024 |
| Lifestyle Marquees Limited | Arts & recreation | 2023 |
| Lightphone Limited | Administrative & support | 2005 |
| Lightway for Life Ltd | Construction | 2018 |
| Lila Group Limited | Administrative & support | 2023 |
| Limitless Pictures Ltd | Information & communication | 2025 |
| Lindfield Court (NO.2) Guildford Residents Association Limited | Households | 1964 |
| Liquidex Limited | Transport & logistics | 2023 |
| Lisa Hawker Limited | Arts & recreation | 2003 |
| Live at Concerts Ltd | Arts & recreation | 2025 |
| Living Sanctuary Ltd | Wholesale & retail | 2019 |
| Livingstone Place (Cranleigh) Management Company Limited | Households | 2006 |
| LIZ Rochester & Associates Limited | Professional & scientific | 2008 |
| LKB Logistics Ltd | Transport & logistics | 2025 |
| London Print Limited | Manufacturing | 2009 |
| Lonvex Construction Ltd | Construction | 2017 |
| LRM Goods Ltd | Wholesale & retail | 2016 |
| LTM Compliance (Dorking) Limited | Water & waste | 2013 |
| Luke Nicholson Holdings Limited | Financial services | 2024 |
| M J Doust Building & Renovations Ltd | Construction | 2023 |
| M S H Accountancy Limited | Professional & scientific | 2016 |
| M&D Builders and Groundworks Limited | Construction | 2014 |
| M.J. Wilson & Associates Limited | Extraterritorial | 1999 |
| Mabapa Limited | Other services | 2016 |
| Macaddam Limited | Real estate | 2025 |
| Machine and MAN Ltd | Households | 2024 |
| Maestry Cleaning Services Ltd | Administrative & support | 2023 |