| Harj IT Contracts Limited | Administrative & support | 2013 |
| Harj Property Ltd | Real estate | 2024 |
| Harjot Haulage Ltd | Transport & logistics | 2022 |
| Hark@Co Limited | Wholesale & retail | 2025 |
| Harken Estates Limited | Real estate | 2024 |
| Harkirt Trade Ltd | Wholesale & retail | 2021 |
| Harlech Estates (Commercial) Limited | Real estate | 1987 |
| Harlech Estates Limited | Construction | 1983 |
| Harmal Limited | Professional & scientific | 2020 |
| Harman Builders Ltd | Construction | 2019 |
| Harmanton Investments Limited | Real estate | 2025 |
| Harmonia Property Group Limited | Real estate | 2025 |
| Harmony Care at Home Ltd | Health & social care | 2024 |
| Harmony Care Services Ltd | Health & social care | 2023 |
| Harmony Collective Ltd | Health & social care | 2025 |
| Harmony Dynamics Ltd | Administrative & support | 2024 |
| Harmony Furnishings Limited | Wholesale & retail | 2009 |
| Harmony Services Group Ltd | Real estate | 2022 |
| Harmony Wellness Clinic Limited | Health & social care | 2024 |
| Harmony Wellness Respite Centres Limited | Public administration | 2024 |
| Harnaik Johal Ltd | Extraterritorial | 2025 |
| Harold L. Smith (Transmissions) Limited | Wholesale & retail | 1973 |
| Haroon Mechanic Ltd | Wholesale & retail | 2026 |
| Harp Projects Ltd | Information & communication | 2012 |
| Harpa Axis Ltd | Administrative & support | 2022 |
| Harpclean Ltd | Professional & scientific | 2026 |
| Harper Meats Limited | Wholesale & retail | 2010 |
| Harper Ventures Ltd | Wholesale & retail | 2025 |
| Harpernational Ltd | Wholesale & retail | 2025 |
| Harpgrove Limited | Construction | 2017 |
| Harpreet Secure Logistic Ltd | Transport & logistics | 2015 |
| Harrier Trim Ltd | Manufacturing | 2022 |
| Harrington Automotive Group Ltd | Wholesale & retail | 2025 |
| Harris Glass Limited | Construction | 1984 |
| Harris of Stirchley Ltd | Real estate | 2021 |
| Harrison Specialist Steels Limited | Wholesale & retail | 2017 |
| Harrisons Homes UK Limited | Real estate | 1999 |
| Harrisons Properties UK Limited | Real estate | 1998 |
| Harry Jones Company Limited | Arts & recreation | 2019 |
| Harry Properties London Ltd | Real estate | 2026 |
| Harry’S Couriers Limited | Transport & logistics | 2025 |
| Hart Design & Engineering Group Limited | Administrative & support | 2016 |
| Hart Design & Engineering Limited | Manufacturing | 2000 |
| Hart Design Ltd | Professional & scientific | 2016 |
| Hart Family Estates Limited | Real estate | 2025 |
| Hart-Archer & Pearce Holdings Limited | Professional & scientific | 2021 |
| Hart-Archer & Pearce Investments Limited | Financial services | 2024 |
| Hart-Archer Investments Limited | Financial services | 2024 |
| Hartland Health & Wellbeing Limited | Health & social care | 2010 |
| Harts Auto Repairs Ltd | Wholesale & retail | 2021 |
| Harts Mercedes Ltd | Wholesale & retail | 2023 |
| Hartwood (Penn Road) Management Company Limited | Households | 2003 |
| Hartwood (Staffordshire) Ltd | Manufacturing | 2008 |
| Hartyclass Limited | Real estate | 1988 |
| Harvest Basket Ltd | Wholesale & retail | 2026 |
| Harvestjoy Ltd | Health & social care | 2025 |
| Harvey Hound Properties Limited | Real estate | 2019 |
| Harvey Jacks Limited | Hospitality | 2010 |
| Harvey Newbuilds Ltd | Construction | 2025 |
| Harvey's MOT Centre Limited | Wholesale & retail | 2015 |
| Harvey-Hop Limited | Manufacturing | 2022 |
| Harveys Estates Telford Limited | Real estate | 2015 |
| Harveys Motorshop Limited | Wholesale & retail | 2024 |
| Harvi's Trading Ltd | Wholesale & retail | 2015 |
| HAS Complete Care Ltd | Health & social care | 2019 |
| Has-Vent Group Limited | Financial services | 2020 |
| Has-Vent Holdings Limited | Financial services | 2020 |
| Has-Vent Limited | Manufacturing | 2018 |
| Haseen (UK) Ltd | Wholesale & retail | 2022 |
| Hashim Technologies Ltd | Education | 2025 |
| Hashmi & Sons Partnership Ltd | Professional & scientific | 2017 |
| Hashmiandco Limited | Health & social care | 2013 |
| Hasnan Properties Ltd | Real estate | 2026 |
| Hasray Ltd | Professional & scientific | 2012 |
| Hassan Deals UK Ltd | Wholesale & retail | 2025 |
| Hassan Digitizing Services Ltd | Professional & scientific | 2025 |
| Hassan Global Ltd | Wholesale & retail | 2026 |
| Hassan Mart Ltd | Wholesale & retail | 2026 |
| Hassnam Ltd | Wholesale & retail | 2026 |
| Haston Reynolds Ltd | Professional & scientific | 2007 |
| Hatfield Grove Investments Limited | Real estate | 2023 |
| Hathersage Homes Ltd | Real estate | 2025 |
| Hatherton Arms Ltd | Hospitality | 2015 |
| Hatherton Marina Limited | Transport & logistics | 1987 |
| Hattons Investment Limited | Real estate | 2025 |
| Hattons Properties Limited | Real estate | 2025 |
| Hatzlachah Care Services Limited | Administrative & support | 2024 |
| Haulotte UK Limited | Manufacturing | 1997 |
| Haulx Logistics Ltd | Transport & logistics | 2023 |
| Haunt Your House Ltd | Wholesale & retail | 2021 |
| Haus of Samantha Ltd | Administrative & support | 2026 |
| Haus of Stitch Ltd | Manufacturing | 2026 |
| Haus of Threads Ltd | Manufacturing | 2024 |
| Haus Renovation Limited | Construction | 2026 |
| Haus Services Limited | Construction | 2021 |
| Havana Bidco Limited | Financial services | 2019 |
| Havana Investco Limited | Financial services | 2025 |
| Havana Topco Limited | Financial services | 2019 |
| Have a Heart (Wolverhampton) | Health & social care | 2021 |
| Havenlodge Limited | Professional & scientific | 2001 |