| Hanover Square Offices Limited | Real estate | 2019 |
| Hanson Close (Beckenham) Management Company Limited | Households | 1991 |
| Hanwell 3A Management Company Limited | Households | 2004 |
| Hapni Limited | Professional & scientific | 2025 |
| Happi Cheesecakes Ltd | Manufacturing | 2024 |
| Happy Dog Petshop Ltd | Wholesale & retail | 2025 |
| Happy Ever Limited | Professional & scientific | 2014 |
| Happy Group 2020 Ltd | Hospitality | 2017 |
| Happy Harry’S Ices Limited | Hospitality | 2025 |
| Happy Home Building Services Ltd | Other services | 2018 |
| Happy Limited | Wholesale & retail | 2003 |
| Happy Little Angels Day Nursery Limited | Education | 2018 |
| Happy Living Care Limited | Other services | 2018 |
| Happyland Investments Ltd | Hospitality | 2001 |
| Happyroadstudios Limited | Information & communication | 2025 |
| Hapusa Spirits UK Ltd | Wholesale & retail | 2018 |
| HAR AM2PM Limited | Wholesale & retail | 2026 |
| Har.Gees Property Services Limited | Real estate | 2017 |
| Haraaz Empire Ltd | Manufacturing | 2011 |
| Haradsea Limited | Real estate | 2019 |
| Haran Foods UK Limited | Wholesale & retail | 2011 |
| Haranbros UK Ltd | Wholesale & retail | 2025 |
| Harbour Fish Limited | Hospitality | 2018 |
| Harbour Scenic Limited | Arts & recreation | 2019 |
| Harbour Trawler Limited | Hospitality | 2023 |
| Harbour View Court (Christchurch) Limited | Households | 1962 |
| Hardwick Estates and Developers Limited | Real estate | 2019 |
| Hardy Technology Ltd | Information & communication | 2024 |
| Hareeni Ltd | Wholesale & retail | 2019 |
| Hares Chase Management Company Ltd. | Households | 2019 |
| Harforth Limited | Households | 1985 |
| Hargees & Sons Limited | Financial services | 2026 |
| Hargees Investment Limited | Real estate | 2026 |
| Hari Heer Properties Limited | Real estate | 2025 |
| HARIBOL-108 Limited | Wholesale & retail | 2025 |
| Haris Enterprises Ltd | Wholesale & retail | 2024 |
| Harish Retail Ltd | Wholesale & retail | 2024 |
| Harishted International Ltd | Wholesale & retail | 2026 |
| Harlequin Solution Consultants Limited | Information & communication | 2014 |
| Harley Street ATP Limited | Health & social care | 2018 |
| Harlow Pizza Limited | Hospitality | 2016 |
| Harlrey Construction Limited | Construction | 2019 |
| Harmonic Distortion Music Limited | Professional & scientific | 2001 |
| Harmonious Brown Limited | Arts & recreation | 2017 |
| Harmony Care Solutions Ltd | Health & social care | 2024 |
| Harmony Recruitment Solutions Ltd | Administrative & support | 2023 |
| Harold Palmer Limited | Real estate | 1958 |
| Harper & Rowe Accountancy Ltd | Professional & scientific | 2025 |
| Harper Sheilds Limited | Professional & scientific | 2015 |
| Harringtons Property Services Ltd | Real estate | 2021 |
| Harris Academies Project Management Limited | Education | 2006 |
| Harris Associates Consulting Ltd | Professional & scientific | 2011 |
| Harris Federation | Education | 2007 |
| Harrison Advisors Limited | Professional & scientific | 2021 |
| Harrison Robert George Limited | Real estate | 2017 |
| Harrogate Healthcare LLP | | 2011 |
| Harrowsdene Management Company Limited | Households | 1986 |
| Harry Bird Templating Limited | Professional & scientific | 2022 |
| Harry Builder London Ltd | Construction | 2025 |
| Harry Lahren the Southern English Company Ltd | Manufacturing | 2025 |
| Harry Scarff Associates Ltd | Professional & scientific | 2021 |
| Harry Woollacott Limited | Information & communication | 2014 |
| Harrykrishna Ltd | Wholesale & retail | 2024 |
| Harry`S Wines Limited | Wholesale & retail | 2006 |
| Hartley’S Homes Limited | Real estate | 2025 |
| Harts London Ltd | Wholesale & retail | 2015 |
| Hartt Investment Limited | Real estate | 2026 |
| Harv Bains Ltd | Professional & scientific | 2020 |
| Harvard Grange Limited | Real estate | 2022 |
| Harvest Meadows at Dunton Management Company Limited | Households | 2013 |
| Harvest of the Nations Limited | Other services | 2009 |
| Harvest Rise (Apartments) Management Company Limited | Households | 2026 |
| Harvest Rise Management Company (Angmering) Limited | Real estate | 2023 |
| Harvey Court (Somersham) Management Company Limited | Households | 1983 |
| Harvey Jones Home Limited | Wholesale & retail | 2024 |
| Harvey Scott Vision Ltd | Professional & scientific | 2018 |
| Harveyjay Healthcare Limited | Health & social care | 2020 |
| HAS 7 Limited | Health & social care | 2017 |
| HAS Associates Limited | Real estate | 2024 |
| HAS Excel Properties Ltd | Real estate | 2020 |
| HAS7 Operations Limited | Real estate | 2024 |
| Hasede Limited | Hospitality | 2026 |
| Haselsu Limited | Hospitality | 2024 |
| Hashtaguk Ltd | Wholesale & retail | 2025 |
| Haslemere Healthcare LLP | | 2012 |
| Haslemere Homes Ltd | Construction | 2012 |
| Hatch Techs UK Ltd | Information & communication | 2021 |
| Hatcham Consulting Ltd | Administrative & support | 2016 |
| Hatfield (Phase 4) Management Company Limited | Households | 2010 |
| Hatjab Ltd | Administrative & support | 2018 |
| Hats OFF Productions | Arts & recreation | 2022 |
| Hatton Point (Corby) Management Company Limited | Households | 2005 |
| Hatwel Ltd | Health & social care | 2017 |
| Haulage Hub UK Ltd | Transport & logistics | 2019 |
| Haupt Estates Ltd | Real estate | 2025 |
| Haus of Amani Ltd. | Other services | 2026 |
| Haus of Swag’S Limited | Other services | 2025 |
| Haus Property Management Ltd | Real estate | 2015 |
| Haute Natural Limited | Wholesale & retail | 2019 |
| Havant Marks Limited | Real estate | 2025 |