| Hargreaves Distribution Ltd | Wholesale & retail | 2019 |
| Hargreaves RTM Company Limited | Households | 2007 |
| Hari Cleaning Service Ltd | Administrative & support | 2024 |
| Hariz Estates (Wirral) Ltd | Real estate | 2025 |
| Hariz Estates Limited | Real estate | 2016 |
| Harker Technologies Limited | Information & communication | 2023 |
| Harkov Formby Ltd | Hospitality | 2022 |
| Harlech Electrical Services Ltd | Manufacturing | 2018 |
| Harleecodypresley Ltd | Construction | 2020 |
| Harlequin Construction Limited | Construction | 2017 |
| Harlequin Lettings Limited | Real estate | 2015 |
| Harlequins Games Limited | Wholesale & retail | 2012 |
| Harlexx Developments Ltd | Real estate | 2011 |
| Harley & Millar Properties Ltd | Real estate | 2020 |
| Harley Buildings Management Company Limited | Households | 2001 |
| Harley PMC Ltd | Professional & scientific | 2015 |
| Harlow Care Ltd | Health & social care | 2025 |
| Harlowgoods Ltd | Wholesale & retail | 2025 |
| Harm Reduction International | Health & social care | 1996 |
| Harman-Smith Limited | Real estate | 2024 |
| Harmia Trading Ltd | Wholesale & retail | 2020 |
| Harmonia Touch Ltd | Health & social care | 2025 |
| Harmony C4RE Limited | Health & social care | 2025 |
| Harmony Casting Ltd | Administrative & support | 2022 |
| Harmony Loom CIC | Hospitality | 2026 |
| Harmony Property Solutions Ltd | Real estate | 2025 |
| Harmony WOK Ltd | Hospitality | 2025 |
| Harnage Estates Limited | Agriculture & fishing | 1961 |
| Harnage Group Ltd | Financial services | 2020 |
| Harney Enterprises Limited | Other services | 2017 |
| Harnoor and Jujhar Ltd | Hospitality | 2022 |
| Harold Jones Ltd | Administrative & support | 2021 |
| Harold Zygmunt Ltd | Administrative & support | 2024 |
| Harouna Fatola a Limited | Wholesale & retail | 2025 |
| Harouna Fatola Ltd | Wholesale & retail | 2025 |
| Harparks Limited | Real estate | 1998 |
| Harper & Woods (Crosby) Ltd | Real estate | 2026 |
| Harper & Woods Holdings Limited | Financial services | 2025 |
| Harper & Woods Limited | Administrative & support | 2014 |
| Harper Black & Associates Ltd | Administrative & support | 2014 |
| Harper Property NW Ltd | Real estate | 2020 |
| Harpers Closet Ltd | Wholesale & retail | 2024 |
| Harpo Marketing Services Limited | Professional & scientific | 2016 |
| Harriet Blyth Photography Ltd | Professional & scientific | 2026 |
| Harriet Harper Ltd | Health & social care | 2023 |
| Harriet Warnock Productions Ltd | Arts & recreation | 2024 |
| Harriet Westcott Ltd | Other services | 2016 |
| Harrieva Ltd | Real estate | 2026 |
| Harrington Chambers Freehold Company Limited | Real estate | 2022 |
| Harrington Chambers Management Company Limited | Households | 2001 |
| Harrington Developments NW Limited | Administrative & support | 2018 |
| Harrington Street Hotel Limited | Hospitality | 2018 |
| Harris (U.K.) | Wholesale & retail | 1987 |
| Harris Catering Solutions Ltd | Hospitality | 2024 |
| Harris Enterprises Trading Limited | Professional & scientific | 2019 |
| Harris Events Ltd | Other services | 2017 |
| Harris GAS Liverpool Ltd | Construction | 2026 |
| Harris Vehicle Sales Limited | Wholesale & retail | 2023 |
| Harris Window Cleaning Ltd | Administrative & support | 2021 |
| Harrison & Co Development Ltd | Extraterritorial | 2017 |
| Harrison Dixon Properties Ltd | Real estate | 2020 |
| Harrison Family Investments Ltd | Financial services | 2020 |
| Harrison Global Ltd | Administrative & support | 2010 |
| Harrison Hall Hospitals Limited | Real estate | 2021 |
| Harrison James Properties Ltd | Real estate | 2021 |
| Harrison Lettings Ltd | Real estate | 2020 |
| Harrison Stringfellow Architects Ltd | Professional & scientific | 2010 |
| Harrison Williams Accountancy Limited | Professional & scientific | 2022 |
| Harrison-Rolls Freeholds Ltd | Real estate | 2024 |
| Harrison-Rolls Holdings Ltd | Financial services | 2024 |
| Harrisonco.Co.Uk Ltd | Administrative & support | 2012 |
| Harrod Building Services Limited | Construction | 1995 |
| Harron 1964 Limited | Extraterritorial | 2014 |
| Harrop Ridley Tyson Limited | Health & social care | 2023 |
| Harrows Trading Cards Ltd | Wholesale & retail | 2025 |
| Harry and Co London Ltd | Professional & scientific | 2026 |
| Harry Anthony Hair Limited | Other services | 2022 |
| Harry Barber L19 Ltd | Other services | 2022 |
| Harry Cole Ltd | Professional & scientific | 2011 |
| Harry Jesse Retail Limited | Wholesale & retail | 2024 |
| Harry Jesse SON & Co Limited | Wholesale & retail | 1951 |
| Harry Walton Vale Ltd | Other services | 2024 |
| Harry's Motors Ltd | Wholesale & retail | 2023 |
| Harry's Wholesalers Limited | Wholesale & retail | 2019 |
| Harry’S Kitchen 1 Ltd | Hospitality | 2023 |
| Harry’S Spuds Limited | Hospitality | 2025 |
| Hart & Co Consultancy Limited | Manufacturing | 2023 |
| Hart Enterprise Limited | Manufacturing | 2018 |
| Hartford Capital Group Ltd. | Real estate | 2022 |
| Hartham Partners Limited | Administrative & support | 2014 |
| Harthan Investments Ltd | Financial services | 2022 |
| Hartington Capital Holdings Limited | Real estate | 2020 |
| Hartington Capital Limited | Real estate | 2020 |
| Hartington Management Limited | Households | 2007 |
| Hartless Beeley Landscapes Ltd | Administrative & support | 2017 |
| Hartley Glazing Limited | Construction | 2019 |
| Hartley Interiors Limited | Wholesale & retail | 2019 |
| Hartley Investments Ltd | Real estate | 2018 |
| Hartley Travel Limited | Transport & logistics | 2009 |
| Hartleys Academy Limited | Education | 2025 |