| Hasta Group Ltd | Construction | 2025 |
| Hastie Repairs Limited | Other services | 2020 |
| Hastings Consultants Limited | Professional & scientific | 2005 |
| Hasty Properties Ltd | Wholesale & retail | 2017 |
| HATAYLI31 Limited | Hospitality | 2025 |
| Haul My GG Limited | Extraterritorial | 2016 |
| Haven Blend Bar Ltd | Hospitality | 2024 |
| Haven Development Company Limited | Administrative & support | 2002 |
| Haven Psychology Services Ltd | Health & social care | 2025 |
| Havenshield Limited | Construction | 2006 |
| Havfram Invest Ltd | Construction | 2022 |
| Havfram Wind Ltd. | Construction | 2022 |
| Havila Shipping UK Limited | Transport & logistics | 1997 |
| Hawco & Sons Limited | Wholesale & retail | 1976 |
| Hawk Debtco Limited | Administrative & support | 2012 |
| Hawk Finco Limited | Administrative & support | 2012 |
| Hawk Noteco Limited | Administrative & support | 2012 |
| Hawk WOK Limited | Hospitality | 2020 |
| Hawkeye QA Ltd | Professional & scientific | 2024 |
| Haxwell Engineering Limited | Professional & scientific | 2026 |
| HAY Healthcare Services Limited | Health & social care | 2015 |
| Haybrake Farms Limited | Agriculture & fishing | 1999 |
| Haydn's Woodfired Pizza Ltd | Hospitality | 2023 |
| Hayosal Limited | Wholesale & retail | 2025 |
| Hayward Data Services Ltd | Information & communication | 2026 |
| Hazeldean Leia LLP | | 2014 |
| Hazy Holidays Ltd | Real estate | 2024 |
| HB (1995) Limited | Construction | 1994 |
| HB (Csct) Limited | Construction | 2002 |
| HB (LCS) Limited | Construction | 1962 |
| HB (SC) Limited | Construction | 1981 |
| HB Enterprises (Scotland) Ltd. | Households | 2008 |
| HCL Realisation Limited | Real estate | 2004 |
| Hcss (2015) Limited | Information & communication | 2015 |
| Hdm-Dc Consultancy Ltd | Professional & scientific | 2026 |
| Head Gear Films Limited | Information & communication | 2002 |
| Headball Limited | Other services | 1982 |
| Healing Hearth Ltd | Arts & recreation | 2024 |
| Health House Chiro Ltd | Health & social care | 2024 |
| Healthcare Direct to YOU Ltd | Wholesale & retail | 2025 |
| Healthcomm UK Limited | Information & communication | 2005 |
| Healthrites Care Solutions Limited | Administrative & support | 2022 |
| Healthy VEG Limited | Administrative & support | 2008 |
| Hearle Investments Ltd | Real estate | 2025 |
| Heartfelt Aromas Ltd | Wholesale & retail | 2021 |
| Heartland Creations Limited | Construction | 2020 |
| Heat Tech Mechanical Limited | Construction | 2006 |
| Heath Consultants Limited | Real estate | 2014 |
| Heather Bruce Limited | Professional & scientific | 2012 |
| Heavenly Aberdeen Ltd | Hospitality | 2021 |
| Heavenly Kitchen Ltd | Wholesale & retail | 2026 |
| Heavy Lift Projects Ltd | Construction | 2022 |
| Heavy Vehicle Inspections and Maintenance Ltd | Wholesale & retail | 2024 |
| HEB Digital Ltd | Professional & scientific | 2020 |
| Hebrides Investments Limited | Real estate | 2014 |
| Hebway Engineering Limited | Professional & scientific | 2011 |
| Hectasquare UK Ltd | Information & communication | 2025 |
| Hefty Games Ltd | Information & communication | 2021 |
| Heinzel Limited | Wholesale & retail | 2025 |
| Helideck Analytics Ltd. | Administrative & support | 2014 |
| Helideck Certification Agency Limited | Administrative & support | 2005 |
| Helideck Investments Limited | Administrative & support | 2017 |
| Helinalysis Holdings Limited | Transport & logistics | 2023 |
| Helinalysis Ltd | Transport & logistics | 2010 |
| Helios Health Support Ltd | Public administration | 2021 |
| Helios United Ltd | Construction | 2023 |
| Heliotrax Ltd | Professional & scientific | 2025 |
| Helitech Ltd | Manufacturing | 2015 |
| Helix Energy Solutions (U.K.) Limited | Mining & quarrying | 2005 |
| Helix International Group Holdings (U.K.) Limited | Financial services | 2025 |
| Helix Offshore Crewing Services Limited | Administrative & support | 2004 |
| Helix Offshore Services Limited | Mining & quarrying | 2019 |
| Helix OIL & GAS (U.K.) Limited | Mining & quarrying | 2018 |
| Helix Oilfield Services Ltd | Administrative & support | 2013 |
| Helix Robotics Solutions Limited | Administrative & support | 2000 |
| Helix Well OPS (U.K.) Limited | Administrative & support | 2002 |
| Hellena Ltd | Hospitality | 2019 |
| Hellenes Limited | Professional & scientific | 2016 |
| Helmerich & Payne Technologies UK Limited | Administrative & support | 2008 |
| Help-On Web Services for Ngos Ltd | Information & communication | 2021 |
| HEM Catering Ltd | Hospitality | 2019 |
| Hemercol Ltd | Professional & scientific | 2024 |
| Hemercol Robotics Ltd | Administrative & support | 2025 |
| Henderson & Hardy Dental Practice Limited | Health & social care | 2018 |
| Henderson Andt Ltd | Professional & scientific | 2023 |
| Henderson Commercial Services Ltd. | Other services | 2004 |
| Henderson Engineering Ltd | Professional & scientific | 2016 |
| Hendrik Veder Group UK Limited | Administrative & support | 2001 |
| Heneli Minerals Limited | Professional & scientific | 2014 |
| Henmon Ltd | Real estate | 2022 |
| Hennessy Properties Ltd | Real estate | 2023 |
| Henro Solutions Ltd | Other services | 2012 |
| Hensmoore Engineering Ltd | Manufacturing | 2013 |
| Hepburn Property Ltd | Manufacturing | 2016 |
| Hephzibah Haven Ltd | Wholesale & retail | 2026 |
| Herald Events Limited | Hospitality | 2025 |
| Herbavita Organics Ltd | Manufacturing | 2024 |
| Herbie Wedding Car Hires Ltd | Administrative & support | 2023 |
| Hercules 2014 Limited | Manufacturing | 2021 |
| Herd Holdings Limited | Financial services | 2003 |