| High Street Builders Ltd | Construction | 2015 |
| High Street Discount Ltd | Wholesale & retail | 2026 |
| High Street Loft Limited | Other services | 2024 |
| High Street Property Developments Ltd | Construction | 2019 |
| High Tech & Trading Company Ltd | Wholesale & retail | 2025 |
| High Trees Ecology Ltd | Professional & scientific | 2023 |
| High Value Capital Ltd | Wholesale & retail | 2024 |
| High Yield Investment Property Limited | Real estate | 2015 |
| High Yield Property Group Limited | Financial services | 2016 |
| High Yield Property Management Limited | Real estate | 2016 |
| High-End Haven Ltd | Wholesale & retail | 2023 |
| High-Tech Windows Limited | Construction | 2000 |
| Higham Bloodstock Ltd | Transport & logistics | 2013 |
| Highbazaar Ltd | Wholesale & retail | 2025 |
| Highbrow Consulting Limited | Professional & scientific | 2016 |
| Highbury Management (Cardiff) Limited | Professional & scientific | 2013 |
| Highbury Services Limited | Construction | 2016 |
| Highclere NX Limited | Information & communication | 2025 |
| Highclere Securities Limited | Real estate | 1979 |
| Higher HQ Ltd | Administrative & support | 2023 |
| Higher Life Care Ltd | Administrative & support | 2020 |
| Highfield Living Ltd | Real estate | 2020 |
| Highglen Investments & Trading Ltd | Financial services | 2019 |
| Highgrove Housekeeping Limited | Administrative & support | 2017 |
| Highland Cedar Limited | Construction | 2019 |
| Highlander European PC | | 2020 |
| Highlights Transfer Limited | Information & communication | 2018 |
| Highmead Holdings Limited | Real estate | 2019 |
| Highmead Investments Limited | Households | 2023 |
| Highmead Properties Limited | Financial services | 2024 |
| Highmead Rail Ltd. | Transport & logistics | 2013 |
| Highmeadow Limited | Information & communication | 2000 |
| Highmountain Enterprises Limited | Hospitality | 2020 |
| Highpeakhandmade Ltd | Wholesale & retail | 2025 |
| Highquest Solutions Ltd | Information & communication | 2014 |
| Highridge Developments Ltd | Real estate | 2022 |
| Highridge Horizon One Ltd | Real estate | 2022 |
| Highridge Management Ltd | Professional & scientific | 2021 |
| Highrose Limited | Construction | 2017 |
| Hight Light Holding Ltd | Financial services | 2020 |
| Highview Relocations Ltd | Households | 2022 |
| Highways Traffic Ltd | Construction | 2017 |
| Highwood Estates Limited | Extraterritorial | 2024 |
| Higo Gago Market Ltd | Other services | 2021 |
| Higo Ltd | Wholesale & retail | 2025 |
| Hijama Centre Cardiff Limited | Other services | 2019 |
| Hike O Clock Ltd | Wholesale & retail | 2025 |
| Hiking Nation Ltd | Arts & recreation | 2019 |
| Hiland Equipment Co., Limited | Professional & scientific | 2006 |
| Hilborough Hall Farms Limited | Agriculture & fishing | 2017 |
| Hildreth Grove Limited | Other services | 2020 |
| Hilfus Group Ltd | Administrative & support | 2023 |
| Hili Tech UK Ltd | Wholesale & retail | 2022 |
| Hill and Horizon Limited | Information & communication | 2026 |
| Hill and Valley Properties Ltd | Real estate | 2024 |
| Hill Dental Consulting Limited | Health & social care | 2021 |
| Hill HAY Limited | Health & social care | 2024 |
| Hill Industries Limited | Real estate | 2021 |
| Hillah Advisory Limited | Information & communication | 2026 |
| Hillbeck Constructions Ltd | Construction | 2016 |
| Hillend Shop Limited | Wholesale & retail | 2019 |
| Hillgate EA Limited | Real estate | 2016 |
| Hillhead Residential Services Limited | Construction | 2016 |
| Hillpharm Ltd | Health & social care | 2024 |
| Hills Fine Meats Ltd | Wholesale & retail | 2026 |
| Hillside Associates Limited | Extraterritorial | 2026 |
| Hillside Triumph Ltd | Financial services | 2024 |
| Hilltop Solicitors Ltd | Professional & scientific | 2021 |
| Hilltop View Limited | Health & social care | 2010 |
| Hillview (Chesham) Limited | Construction | 2004 |
| Hillview Saas Limited | Information & communication | 2025 |
| Hillyaan Limited | Wholesale & retail | 2023 |
| Hiltonshepperson Ltd | Public administration | 2020 |
| Hiltop Roti Ltd | Hospitality | 2017 |
| HIM FM Ltd | Administrative & support | 2019 |
| Himaa Ltd | Wholesale & retail | 2020 |
| Himalaya-Store Limited | Other services | 2024 |
| Hims Consultancy (Housing & IT ) Ltd | Professional & scientific | 2023 |
| Hinc Property Management Ltd | Real estate | 2021 |
| Hinchly & Lloyd Services Limited | Real estate | 1984 |
| Hinchly's Limited | Wholesale & retail | 1999 |
| Hingley Financial Ltd | Financial services | 2011 |
| Hinterland Entertainment Limited | Arts & recreation | 2024 |
| HIP Foods Ltd | Manufacturing | 2018 |
| HIP Labs Limited | Information & communication | 2016 |
| Hippo Global Holding Ltd | Agriculture & fishing | 2021 |
| Hippo Health Care Ltd | Health & social care | 2020 |
| Hira Holdings Limited | Construction | 2018 |
| Hiraeth AR Y WE CYF. | Wholesale & retail | 2012 |
| Hiraeth Architecture Ltd | Professional & scientific | 2019 |
| Hiraeth Heritage Ltd | Professional & scientific | 2020 |
| Hiraeth Portfolios Limited | Real estate | 2025 |
| Hirani Housing Limited | Real estate | 2020 |
| Hirate Limited | Wholesale & retail | 2025 |
| Hire a Hubby ST Neots Limited | Construction | 2018 |
| Hire Compliance Limited | Professional & scientific | 2020 |
| Hire Fast Ltd | Information & communication | 2020 |
| Hire Hunt Recruitment Limited | Other services | 2025 |
| Hire NOW Ltd | Administrative & support | 2024 |
| Hire Security Limited | Administrative & support | 2019 |