| Harmy Global Branding Limited | Wholesale & retail | 2022 |
| Harnal Property Ltd | Real estate | 2023 |
| HARNS786 Limited | Transport & logistics | 2025 |
| Harnwick Freight Services Limited | Transport & logistics | 1982 |
| Harold F.Ward Limited | Extraterritorial | 1932 |
| Harold Wood & Sons (Plumbing and Heating) Limited | Wholesale & retail | 1962 |
| Haroon ALI Ltd | Professional & scientific | 2024 |
| Haroon and Brother Ltd | Wholesale & retail | 2025 |
| Haroon Auto Ltd | Wholesale & retail | 2023 |
| Haroon Care Services Ltd | Health & social care | 2020 |
| Haroon Travel MSB Ltd | Administrative & support | 2010 |
| Harp Wines & Spirits Ltd | Wholesale & retail | 2014 |
| Harpar Group Ltd | Construction | 2016 |
| Harper & Lewis Limited | Wholesale & retail | 2019 |
| Harper & SON Ltd | Transport & logistics | 2018 |
| Harper Avery Ltd | Professional & scientific | 2020 |
| Harper Business Consultancy Ltd | Information & communication | 2022 |
| Harper Environmental Limited | Professional & scientific | 2019 |
| Harper Fielding Ltd | Construction | 2020 |
| Harper Interiors Ltd | Construction | 2019 |
| Harper Investment Group Ltd | Extraterritorial | 2022 |
| Harper James Limited | Professional & scientific | 2011 |
| Harper's Delivery & Removals Limited | Transport & logistics | 2018 |
| Harpers Portfolio Ltd | Real estate | 2021 |
| Harpers Villas Care Centre Ltd | Health & social care | 2014 |
| Harps Global UK Limited | Administrative & support | 1985 |
| Harrec Prime Limited | Real estate | 2025 |
| Harrington & Co Estates Ltd | Real estate | 2026 |
| Harrington (Tanworth-In-Arden) Management Company Ltd | Households | 2022 |
| Harrington Homes & Care Services Ltd | Real estate | 2025 |
| Harrington Property Group WM Ltd | Households | 2024 |
| Harringtons Consultancy Ltd | Professional & scientific | 2021 |
| Harringtons Legal LLP | | 2010 |
| Harriott Care Group Ltd | Health & social care | 2024 |
| Harris & Dolman Ltd | Administrative & support | 2018 |
| Harris & Sheldon (Display) Limited | Professional & scientific | 1954 |
| Harris Accountancy Services Ltd | Professional & scientific | 2015 |
| Harris Auditing Services Ltd | Professional & scientific | 2021 |
| Harris Byrne Interiors Limited | Professional & scientific | 2012 |
| Harris Care Ltd | Health & social care | 1994 |
| Harris Hair Studio Ltd | Other services | 2018 |
| Harris Homes Property Group Ltd | Real estate | 2025 |
| Harris Lamb Holdings Limited | Financial services | 2017 |
| Harris Lamb Limited | Real estate | 2001 |
| Harris Mews Management Limited | Households | 1995 |
| Harris People Solutions Ltd | Professional & scientific | 2023 |
| Harris Pharm Ltd | Health & social care | 2021 |
| Harris's of Ringside Limited | Real estate | 1987 |
| Harris-Mondales & Co Limited | Wholesale & retail | 2019 |
| Harrison Benn Ltd | Administrative & support | 1994 |
| Harrison Business Finance Ltd | Financial services | 2025 |
| Harrison Charles Design Limited | Professional & scientific | 2020 |
| Harrison Design Company Limited | Professional & scientific | 1990 |
| Harrison Fowler Music Limited | Arts & recreation | 2015 |
| Harrison GRP Limited | Wholesale & retail | 2016 |
| Harrison Joyce Holdings Limited | Extraterritorial | 2012 |
| Harrison Morrow Racing Limited | Arts & recreation | 2021 |
| Harrison PMO Advisory Ltd | Professional & scientific | 2026 |
| Harrison Vale Ltd | Administrative & support | 2026 |
| Harrison's Anglo International Transport Limited | Transport & logistics | 2020 |
| Harrisons Garden Care Ltd | Administrative & support | 2023 |
| Harrisons Plumbing and Home Improvements Ltd | Construction | 2023 |
| Harrisons Road (9-19) Management Company Ltd | Households | 2025 |
| Harrisuns Ltd | Real estate | 2021 |
| Harrold Holdings Limited | Wholesale & retail | 2020 |
| Harrold Jones Services Limited | Extraterritorial | 2009 |
| Harrowbrook Ltd | Real estate | 2020 |
| Harry Anchor Logistics Ltd | Transport & logistics | 2025 |
| Harry Beauticians Limited | Other services | 2017 |
| Harry Fairclough (Construction) Limited | Construction | 1977 |
| Harry Fairclough (Contracting) Limited | Construction | 2013 |
| Harry Fairclough (New Build) Limited | Construction | 2008 |
| Harry Fairclough Group Limited | Professional & scientific | 2007 |
| Harry Fish Bar Ltd | Hospitality | 2024 |
| Harry George Hall Limited | Information & communication | 2018 |
| Harry Mason Limited | Manufacturing | 1965 |
| Harry Motors Warwick Limited | Wholesale & retail | 2024 |
| Harry SAM Label Ltd | Wholesale & retail | 2026 |
| Harry's Barber Midlands Ltd | Other services | 2026 |
| Harry's Classics Limited | Wholesale & retail | 2021 |
| Harry's Creations Limited | Other services | 2007 |
| Harry's Day Nursery Limited | Health & social care | 2023 |
| Harry's Housing Ltd | Real estate | 2026 |
| Harryville Solutions Ltd | Information & communication | 2025 |
| Harsabgur Limited | Wholesale & retail | 2021 |
| Harsaj Transport London Limited | Transport & logistics | 2026 |
| Harsh & Co. Ltd | Health & social care | 2020 |
| Harshah Ltd | Wholesale & retail | 2025 |
| Harsimran Fashion UK Limited | Wholesale & retail | 2024 |
| Harsingh Builders Ltd | Construction | 2025 |
| Hart 2 Hart Sameday Courier Limited | Transport & logistics | 2011 |
| Hart Fone Box Ltd | Manufacturing | 2019 |
| Hart Recruitment Limited | Administrative & support | 2001 |
| Hart Training Ltd | Administrative & support | 2020 |
| Harte Properties Ltd | Real estate | 2019 |
| Hartfield Heating Limited | Construction | 2020 |
| Harti Consultancy Ltd | Administrative & support | 2017 |
| Hartington Business Services Limited | Professional & scientific | 1998 |
| Hartland Fixing Ltd | Construction | 2014 |
| Hartland Village Residents Management Company Limited | Households | 2019 |