| H Q Investors Property Ltd | Real estate | 2019 |
| Hairtopia Limited | Other services | 2020 |
| Halalified Ltd | Wholesale & retail | 2026 |
| Hall Inc Ltd | Real estate | 2024 |
| Hamiltons Care Limited | Health & social care | 2018 |
| Hamit Media Ltd | Professional & scientific | 2013 |
| Hands on Consultants Limited | Information & communication | 2013 |
| Harestone Associates Limited | Professional & scientific | 2012 |
| Harmony House Construction Limited | Construction | 2009 |
| Harston Ltd | Real estate | 1995 |
| Hashtag Consulting Limited | Information & communication | 2019 |
| Hawkhirst Environment Protection Action Limited | Professional & scientific | 2020 |
| Hawkhirst Road Ltd | Professional & scientific | 2016 |
| Hawthorn Way Residents Limited | Households | 1998 |
| Hayagreev Limited | Real estate | 2021 |
| Hazeldene Court Residents Association Limited | Households | 1960 |
| Henry Turner (Machine Tools) Limited | Wholesale & retail | 1955 |
| Hhpm Ltd | Health & social care | 2023 |
| Highwood Close Management Company Ltd | Households | 2021 |
| Hill House Crystal Palace Limited | Real estate | 2015 |
| Hill House Nursing Home Limited | Health & social care | 1963 |
| HLA Capital Limited | Real estate | 2025 |
| Hobson Services Ltd | Construction | 2020 |
| Holcombe Court Limited | Construction | 2016 |
| Holloway Lawn Specialists Limited | Administrative & support | 2019 |
| Hope and Greenwood Ltd | Wholesale & retail | 2007 |
| House of Kind (London) Limited | Wholesale & retail | 2024 |
| HPH Consultancy Services Limited | Information & communication | 2005 |
| HR Overload Ltd | Administrative & support | 2016 |
| HSA Consults Ltd | Real estate | 2024 |
| HTK Transport Ltd | Transport & logistics | 2020 |
| Hybrid Unicorn Limited | Professional & scientific | 2019 |
| Hydraflow Plumbing and Drainage Ltd | Construction | 2024 |
| I Goodwin Ltd | Information & communication | 2011 |
| I H Gilbert Rigging Ltd | Construction | 2021 |
| I76 Consulting Ltd | Professional & scientific | 2019 |
| IAA Cars Ltd | Administrative & support | 2024 |
| Ida's House Limited | Wholesale & retail | 2023 |
| Idea Alliance Ltd | Wholesale & retail | 2014 |
| Ikedaaz Ltd | Transport & logistics | 2021 |
| Imaginehub Limited | Professional & scientific | 2021 |
| Improve My Search Ranking Limited | Information & communication | 2015 |
| IN Tuition Driving School Limited | Education | 2013 |
| Indigo Property Services Ltd | Construction | 2016 |
| Ingrained Limited | Education | 2017 |
| INK Partners Limited | Real estate | 2024 |
| Inner Compass Advisory Limited | Professional & scientific | 2026 |
| Intal Advisory Ltd | Administrative & support | 2002 |
| Itech Express Ltd | Wholesale & retail | 2025 |
| Itmeetslaw Limited | Information & communication | 2000 |
| J W Brown Contracts Limited | Construction | 2014 |
| J-Miriamjoel Ltd | Administrative & support | 2015 |
| J. & B. O'Brien Builders & Contractors (Croydon) Limited | Construction | 1972 |
| J.D. Consultants (UK) Limited | Professional & scientific | 2008 |
| Jampend Investments Limited | Real estate | 2009 |
| Jaymon Ltd | Real estate | 2022 |
| JBT Plumbing and Heating (Surrey) Ltd | Construction | 2017 |
| Jessica Hann Limited | Information & communication | 2015 |
| Jini Health Care Limited | Health & social care | 2009 |
| JL Tennis & Activity Holidays Spain Ltd | Administrative & support | 2023 |
| Jlcroos Limited | Real estate | 2021 |
| Jldk Resources Ltd | Professional & scientific | 2019 |
| JM Plumbing & Heating Limited | Construction | 2019 |
| Jobsunlimited Ltd | Administrative & support | 2025 |
| Joint Venture Branding UK Limited | Real estate | 2018 |
| Jonas Limited | Health & social care | 2015 |
| Jordan Educational Services Ltd | Education | 2015 |
| JP Prop Investments Ltd | Real estate | 2026 |
| Kabir Business Group Ltd | Financial services | 2025 |
| Kabir Driving Academy Ltd | Education | 2025 |
| Kanoa Creative Limited | Professional & scientific | 2025 |
| KBZ Developments Ltd | Construction | 2026 |
| KCG ABE Limited | Health & social care | 2017 |
| KCG Chaucer Limited | Real estate | 2017 |
| KCG Diagnostics Limited | Health & social care | 2024 |
| KCG Housing Association Ltd | Real estate | 2021 |
| KCG Nelson Limited | Real estate | 2017 |
| KCG Nelson Properties Ltd. | Real estate | 2017 |
| KCG Social Housing Ltd | Real estate | 2024 |
| KCG16 Limited | Real estate | 2016 |
| KCG17 Community Interest Company | Real estate | 2017 |
| KCG17B Limited | Real estate | 2017 |
| Kenbury House Ltd. | Health & social care | 2019 |
| Kendor Day Nursery Ltd | Information & communication | 2010 |
| Kenley Wine Merchant Ltd | Wholesale & retail | 2014 |
| Kenley Woods Joinery Ltd | Manufacturing | 2025 |
| Kenwood Ridge Management (2021) Limited | Real estate | 2020 |
| KH 124 Limited | Real estate | 2024 |
| KH 126 Limited | Real estate | 2024 |
| KH 128 Limited | Real estate | 2024 |
| Kibo Hospital Services Limited | Health & social care | 2016 |
| Kinal Solutions Limited | Information & communication | 2007 |
| Kingdom Principles Limited | Administrative & support | 2008 |
| Kingfisher Place (South Darenth) Management Limited | Real estate | 2009 |
| Kingscourt Plumbing and Heating Limited | Construction | 2024 |
| Kirtasha Stone Limited | Manufacturing | 1995 |
| Kishan Consultancy Ltd | Professional & scientific | 2023 |
| KJB Communications Limited | Information & communication | 2013 |
| Knight's Diagnostics Limited | Health & social care | 2018 |
| Kobra Inns Ltd | Hospitality | 2025 |