| High Street Club Limited | Construction | 2019 |
| High View (Blaydon) Limited | Households | 2006 |
| High View Software Solutions Limited | Information & communication | 2012 |
| High Voltage Distribution Contracting Ltd | Construction | 2025 |
| High Voltage Specialists Ltd | Construction | 2025 |
| Higham Engineering Management Limited | Professional & scientific | 2015 |
| Higham Place Management Company Limited | Households | 2012 |
| Higham Ventures Limited | Real estate | 2002 |
| Highbridge Commercial II Limited | Construction | 2005 |
| Highbridge Commercial Limited | Administrative & support | 2017 |
| Highbridge Group Limited | Administrative & support | 2020 |
| Highbridge Leisure Limited | Arts & recreation | 2020 |
| Highcliffe Waters Limited | Hospitality | 2016 |
| Highfield Farm (West Melton) Residents Management Company Limited | Real estate | 2020 |
| Highfield Place 1969 Limited | Extraterritorial | 2015 |
| Highfield Property Developments Limited | Real estate | 2019 |
| Highfivefitness Ltd | Arts & recreation | 2022 |
| Highgate Block 1 RTM Company Limited | Households | 2006 |
| Highgate Block 2 RTM Company Limited | Real estate | 2006 |
| Highgate Block 4 RTM Company Limited | Real estate | 2008 |
| Highgate Estates Ltd | Real estate | 2021 |
| Highgate Properties N/E Limited | Real estate | 2012 |
| Highgate Wholesale Ltd | Wholesale & retail | 2021 |
| Highgrade Associates Limited | Professional & scientific | 2002 |
| Highland Fireworks Ltd | Wholesale & retail | 2026 |
| Highland Geology Limited | Mining & quarrying | 1995 |
| Highland Grand Limited | Real estate | 2017 |
| Highland Timber Harvesting Ltd | Agriculture & fishing | 2010 |
| Highlander Public House Company Ltd | Hospitality | 2018 |
| Highline Flat Roofing and Upvc Ltd | Construction | 2026 |
| Highline Roofing North East Limited | Construction | 2025 |
| Highs Financial Management Limited | Financial services | 2021 |
| Highway Retail Ltd | Wholesale & retail | 2019 |
| Highwood Developments Ltd | Construction | 2016 |
| HII Grind Limited | Hospitality | 2024 |
| HII Gym Limited | Arts & recreation | 2023 |
| HII Holdings Ltd | Financial services | 2026 |
| Hiit Kitchen Food Services Limited | Hospitality | 2018 |
| Hiitcentive Ltd | Professional & scientific | 2025 |
| Hildagan Health Limited | Health & social care | 2019 |
| Hill House Limited | Professional & scientific | 2008 |
| Hill Park Bar Ltd | Hospitality | 2026 |
| Hill Top Farm Management Company Limited | Households | 2015 |
| Hillhead (Streetgate) Management Company Limited | Real estate | 2024 |
| Hillhead Indian Kitchen Limited | Hospitality | 2025 |
| Hillheads Chippy Ltd | Hospitality | 2024 |
| Hillheads Farm Equine Limited | Wholesale & retail | 2022 |
| Hillies View (Wombwell) Management Company Limited | Real estate | 2019 |
| Hills Landscapes (North East) Limited | Administrative & support | 2002 |
| Hilly Estates Ltd | Real estate | 2026 |
| Hilo Properties Ltd | Real estate | 2025 |
| Hilonurs Ltd | Health & social care | 2019 |
| Hilton Hire Limited | Administrative & support | 2025 |
| Hilux UK Ltd | Wholesale & retail | 2015 |
| Hima Food Ltd | Hospitality | 2023 |
| Hima PVT Ltd | Wholesale & retail | 2025 |
| Hind Holdings (Newcastle Upon Tyne) Limited | Financial services | 2022 |
| Hing's Limited | Professional & scientific | 2016 |
| Hinshaw Private & Medicolegal Services Ltd | Health & social care | 2017 |
| Hioh Limited | Hospitality | 2024 |
| HIQ Consultancy Limited | Professional & scientific | 2026 |
| Hire Torque Ltd | Wholesale & retail | 2023 |
| Hisham Elsayed Limited | Health & social care | 2012 |
| Histocyte Laboratories Ltd | Professional & scientific | 2014 |
| Hitch Nest Limited | Real estate | 2025 |
| Hitek Electronic Materials Limited | Manufacturing | 1985 |
| Hitek-Nology Solutions Limited | Administrative & support | 2006 |
| Hitmarker Ltd | Administrative & support | 2018 |
| Hive Estates Limited | Real estate | 2014 |
| Hive Utilities Limited | Professional & scientific | 2026 |
| Hivehr Limited | Information & communication | 2015 |
| HIX Access Ltd | Construction | 2025 |
| HJD Renewable Energy Ltd | Construction | 2023 |
| Hjem(Yem) Community Interest Company | Education | 2023 |
| Hjemmelavet Ltd | Manufacturing | 2025 |
| Hjwm Holdings Limited | Professional & scientific | 2025 |
| HK Builder NE Limited | Construction | 2024 |
| HK Creative Limited | Real estate | 2025 |
| HK Elite Ltd | Construction | 2026 |
| HKP Events Ltd | Hospitality | 2024 |
| HKS Rentals Limited | Administrative & support | 2002 |
| HL Brothers Limited | Wholesale & retail | 2020 |
| HLA Property NE Ltd | Real estate | 2025 |
| Hlcg Ltd | Health & social care | 2025 |
| HLM (NE) Ltd | Construction | 2026 |
| HLW Holdings Limited | Extraterritorial | 2020 |
| HM Dental Advancements Ltd | Education | 2023 |
| HM Gas&Plumbing Ltd | Construction | 2026 |
| HM Hire Services Limited | Administrative & support | 2023 |
| HM Locums Ltd | Health & social care | 2015 |
| HM Property Services Ltd | Real estate | 2018 |
| HM Residential Building Services Ltd | Real estate | 2009 |
| Hmlau Ltd | Transport & logistics | 2022 |
| HMS President (London) Limited | Hospitality | 2004 |
| Hmss Limited | Administrative & support | 2018 |
| HMW (NE) Limited | Wholesale & retail | 2017 |
| HMY Nottingham Ltd | Manufacturing | 2003 |
| HMY UK Innovation in Retail Ltd | Manufacturing | 2006 |
| HN & Co Group Ltd | Wholesale & retail | 2025 |
| HNC NE Ltd | Hospitality | 2022 |