| Hardy's Antiques Ltd | Wholesale & retail | 2026 |
| Harewarren Limited | Arts & recreation | 2017 |
| Harlow Finance Limited | Financial services | 2012 |
| Harmer Lifestyle Limited | Extraterritorial | 2001 |
| Harmony Integration Ltd | Wholesale & retail | 2021 |
| Harmony Realtors Limited | Real estate | 2024 |
| Harri Photography Ltd | Professional & scientific | 2025 |
| Harrier Gates Ltd | Other services | 2017 |
| Harrington Asset Management LLP | | 2020 |
| Harrington Handyman Services Limited | Construction | 2025 |
| Harrington Investment Properties Limited | Real estate | 2018 |
| Harrington Property Consultancy Limited | Administrative & support | 2007 |
| Harringtons Surveyors Limited | Professional & scientific | 2011 |
| Harrison Golf & Leisure Ltd | Arts & recreation | 2018 |
| Harrison James IT Services Ltd | Information & communication | 2014 |
| Harrison Lowe Limited | Education | 2011 |
| Harry Cooksley Ltd | Professional & scientific | 2025 |
| Harry Mcculloch Property Ltd | Real estate | 2025 |
| Hart Brown LLP | | 2019 |
| Hartfield House Management Company Limited | Households | 2020 |
| Hartpoint Limited | Construction | 1994 |
| Harward Properties Limited | Real estate | 2000 |
| Hashmi Consulting & Investments Ltd | Information & communication | 2017 |
| Haslemere Heating & Bathrooms Ltd | Construction | 2020 |
| Hastings Investment Management Limited | Financial services | 2019 |
| Hatfield Consultancy Ltd | Professional & scientific | 2006 |
| Have a Bounce Limited | Arts & recreation | 2016 |
| Havenhurst (Guildford) RTM Company Ltd | Households | 2020 |
| Hawksmoor Homes Limited | Construction | 2009 |
| Hawthorn Road Limited | Real estate | 2026 |
| Hayley Smith Accountancy Ltd | Professional & scientific | 2013 |
| Haywards Heath Homecare Ltd | Wholesale & retail | 2014 |
| HB Consulting Ltd | Professional & scientific | 2015 |
| Hbbar Limited | Other services | 2019 |
| Hbode Limited | Real estate | 2020 |
| HCS European Ltd | Wholesale & retail | 2022 |
| Hdporsche Ltd | Wholesale & retail | 2021 |
| Head & SON Limited | Construction | 2010 |
| Head Gate (Balham) Limited | Construction | 2023 |
| Head Gate (T Wells) Limited | Other services | 2024 |
| Head Science Limited | Administrative & support | 2024 |
| Headley House (Guildford) Limited | Real estate | 2016 |
| Healing Herb Haven CIC | Education | 2026 |
| Healing Pathways Foundation Ltd | Health & social care | 2024 |
| Health Care Navigator LLP | | 2019 |
| Healthcare Partners Limited | Health & social care | 2017 |
| Healthy Home & Office (North West) Limited | Wholesale & retail | 2013 |
| Healthy Home & Office Limited | Wholesale & retail | 2014 |
| Heaps Carpentry & Construction Limited | Construction | 2020 |
| Heartwood Joinery (Surrey) Limited | Manufacturing | 2016 |
| Heat Ninja Ltd | Construction | 2023 |
| Heath Consulting Ltd | Professional & scientific | 2017 |
| Heath Farm Energy Limited | Energy | 2015 |
| Heather & Co Ltd | Professional & scientific | 2024 |
| Heatherdene Developments Limited | Construction | 2024 |
| Heathermount Management Company (Guildford) Limited | Households | 1971 |
| Heathrow Couriers (UK) Limited | Transport & logistics | 2001 |
| Heathrow Exports (UK) Limited | Transport & logistics | 2014 |
| Hecla Investments Limited | Financial services | 2023 |
| Hedef Structural Engineering and Consulting Ltd | Construction | 2021 |
| Hedgehog Hall Limited | Professional & scientific | 2024 |
| Hedgehog Safaris Ltd | Other services | 2018 |
| Hedger Bespoke Ltd | Construction | 2025 |
| Hedgeway Consulting Ltd | Information & communication | 2014 |
| Hedleys Solicitors LLP | | 2004 |
| Helen Bratby Limited | Professional & scientific | 2007 |
| Heliostor Limited | Information & communication | 2013 |
| Helixr Ltd | Information & communication | 2020 |
| Hellenic Restaurants Group Limited | Hospitality | 2020 |
| Hellenic Restaurants Limited | Hospitality | 2020 |
| Hellenic Takeaway Limited | Hospitality | 2020 |
| Hello Developments Limited | Information & communication | 2017 |
| Hello Future | Administrative & support | 2023 |
| Hello Games Holdings Limited | Financial services | 2023 |
| Hello Games Ltd | Information & communication | 2008 |
| Hello Games Publishing Limited | Information & communication | 2024 |
| Hello Labs Limited | Information & communication | 2017 |
| Hello Princess Limited | Information & communication | 2019 |
| Hello Wolf Limited | Information & communication | 2022 |
| Hemisphere Projects Limited | Administrative & support | 2004 |
| Hend & Lamiaa Ltd | Information & communication | 2019 |
| Hendham Developments Limited | Real estate | 2017 |
| Hendon Communications Strategy Limited | Professional & scientific | 2011 |
| Hendon House Management (Number 2) Limited | Households | 2001 |
| Henley Park (Paddock) Limited | Households | 2001 |
| Henley Phillips Designs Ltd | Manufacturing | 2025 |
| Hennessey-Brown Music Limited | Arts & recreation | 2024 |
| HEO Property Ltd | Real estate | 2022 |
| Hepka Property Limited | Real estate | 2023 |
| Hepsco Limited | Financial services | 2025 |
| HER Seoul Skincare Ltd | Other services | 2025 |
| HER Strength Ltd | Arts & recreation | 2023 |
| Herculaneum Management Limited | Professional & scientific | 2016 |
| Herga Technology Limited | Manufacturing | 1954 |
| Heritage Access Ltd | Education | 2024 |
| Heritage Homes (Surrey) Ltd | Real estate | 2017 |
| Heritage IMA Limited | Financial services | 2013 |
| Heritage Independent Mortgage Advisers Limited | Financial services | 2013 |
| Heritage Price Ferguson Limited | Professional & scientific | 2024 |
| Heritage Restorers Ltd | Construction | 2022 |