| Hebb Associates Limited | Professional & scientific | 2008 |
| Hedra Investment Limited | Real estate | 2020 |
| Henry Betts Landscaping Limited | Administrative & support | 2003 |
| Heritage Media Rigging Ltd | Construction | 2018 |
| Hideaway Living Ltd | Construction | 2024 |
| Higgins Consultancy & Trading Ltd | Professional & scientific | 2018 |
| Hindsight Limited | Professional & scientific | 1987 |
| Hiskail Enterprises Limited | Financial services | 2024 |
| HM Consulting - Exec Coaching and HR Management Consultancy Limited | Administrative & support | 2023 |
| HOE HOE Landscapers Limited | Administrative & support | 2025 |
| Holywell Recycling Limited | Transport & logistics | 2010 |
| Holywell Utility Limited | Water & waste | 2004 |
| Home Counties Consulting Ltd | Information & communication | 2017 |
| Home Education Sport Ltd | Arts & recreation | 2023 |
| Hydralectric Group Limited | Manufacturing | 2011 |
| Hydralectric International Limited | Manufacturing | 2016 |
| Hydralectric Limited | Other services | 1973 |
| Hytro Limited | Manufacturing | 2019 |
| I-Mortgage Management Limited | Financial services | 2018 |
| I.E.C. Services Co. Limited | Administrative & support | 2002 |
| Iactiveweb Limited | Wholesale & retail | 2015 |
| IAN Robinson Design Ltd | Information & communication | 2023 |
| Ican Communications Media Ltd. | Professional & scientific | 2018 |
| Icon Coffee & Play Ltd | Hospitality | 2025 |
| Icon Couture Ltd | Manufacturing | 2019 |
| Icon!C Ltd | Professional & scientific | 2023 |
| IDG Trade Ltd | Construction | 2012 |
| Idrive Cars Sale Ltd | Wholesale & retail | 2017 |
| IG & Associates Podiatry Services Limited | Health & social care | 2023 |
| Illume Recruitment Ltd | Administrative & support | 2015 |
| Imaan Takeaway Limited | Hospitality | 2017 |
| Imarlow Properties Ltd | Financial services | 2020 |
| Imperius (Investment) Limited | Professional & scientific | 2024 |
| Improve and Build Ltd | Construction | 2022 |
| Incredible Bulk Ltd | Wholesale & retail | 2018 |
| Independent Quality Asset Management Ltd | Professional & scientific | 2015 |
| Industry Apparel UK Ltd | Manufacturing | 2024 |
| Initio Events Ltd | Arts & recreation | 2008 |
| INT4ECO Ltd | Information & communication | 2022 |
| Integrated Finishers Limited | Manufacturing | 1984 |
| Integrated Information Methods Limited | Information & communication | 2013 |
| Intelligent Golf Devices Ltd | Manufacturing | 2025 |
| Intercompany Limited | Arts & recreation | 2025 |
| Interim 21 Limited | Professional & scientific | 2002 |
| Invezt Limited | Real estate | 2022 |
| Island Outsource Solutions Limited | Administrative & support | 2021 |
| Italia Interiors Ltd | Construction | 2021 |
| Italkero UK Limited | Wholesale & retail | 2024 |
| Iver Management Limited | Professional & scientific | 2002 |
| JA Cleaning Ltd | Administrative & support | 2012 |
| Jabar the CUT Ltd | Other services | 2023 |
| JAM UK - Design & Architecture Ltd | Manufacturing | 2023 |
| Jane Lipscombe Consulting Ltd | Extraterritorial | 2013 |
| Janix Properties Limited | Real estate | 2007 |
| Jannah Jewels Limited | Wholesale & retail | 2024 |
| JC Digital Consulting Ltd | Information & communication | 2023 |
| JCO Consultancy Services Ltd | Professional & scientific | 2020 |
| JCZ Ventures Limited | Financial services | 2024 |
| JD Williams Construction Limited | Construction | 2019 |
| JI Guildford Ltd | Hospitality | 2025 |
| Jlouw Consultancy Limited | Information & communication | 2025 |
| JMD Site Services Limited | Construction | 2016 |
| JMG Restaurant Limited | Hospitality | 2023 |
| JMR Properties Limited | Construction | 2005 |
| John Williams Legal Services Ltd | Professional & scientific | 2022 |
| Jonathan Field's Professional Shop Ltd | Wholesale & retail | 2019 |
| Joppa Books Limited | Real estate | 1988 |
| Joviannerain Ltd | Health & social care | 2014 |
| Joyful Smile Limited | Health & social care | 2021 |
| Juntos Bravos Limited | Real estate | 2023 |
| Juntos Mejor Limited | Real estate | 2024 |
| Just ASK Estate Services Limited | Other services | 2006 |
| K LEE Consultancy Limited | Professional & scientific | 2015 |
| K Robson Aesthetics Ltd | Other services | 2024 |
| K-H Prestige Paint Works Limited | Construction | 2016 |
| Kable Properties Ltd | Real estate | 2020 |
| Kaleidoscope Decor Ltd | Construction | 2026 |
| Kapella Services Limited | Information & communication | 2020 |
| Kariba Investments Ltd | Professional & scientific | 2007 |
| Kayino Limited | Administrative & support | 2016 |
| Kebabcan Ltd | Hospitality | 2025 |
| Kerslake Rentals Ltd | Real estate | 2018 |
| Kesa Consulting LLP | | 2006 |
| Kestrel Wholesale Holdings Limited | Financial services | 2008 |
| Key Osteopaths Ltd | Health & social care | 2021 |
| KG Supermarkets Limited | Wholesale & retail | 2023 |
| KH Bespoke Spray Service Ltd | Construction | 2025 |
| Kings Inc Limited | Wholesale & retail | 2025 |
| Kings Kitchen Surrey Ltd | Hospitality | 2026 |
| Kite Freight Services Ltd | Transport & logistics | 2019 |
| Kiwi Creations Ltd | Construction | 2014 |
| KML Consultancy Limited | Information & communication | 2024 |
| Knight Designs Ltd | Professional & scientific | 2019 |
| Kourosh Limited | Professional & scientific | 2011 |
| Kristina C Healthcare Ltd | Financial services | 2017 |
| KT Hair&Beauty Ltd | Other services | 2025 |
| Kutchenhaus West Byfleet Ltd | Wholesale & retail | 2025 |
| Kybert and Butler Limited | Construction | 2026 |
| Kybert Limited | Professional & scientific | 2021 |
| Lamilia Limited | Financial services | 2024 |