| High Edge Wildland Ltd | Arts & recreation | 2023 |
| High Five Training Limited | Education | 2015 |
| High Gloss Builders Limited | Construction | 2015 |
| High Growth Robotics Limited | Professional & scientific | 2017 |
| High Trade Ltd | Wholesale & retail | 2026 |
| Highbourne Build Ltd | Construction | 2019 |
| Highbourne Homes Ltd | Construction | 2019 |
| Highbourne Ltd | Construction | 2018 |
| Highfield Children's Centre | Education | 2006 |
| Highfields Steel Construction Limited | Construction | 2016 |
| Highland Coaches Limited | Transport & logistics | 2017 |
| Highland Mechanical Services Limited | Construction | 2003 |
| Highland Motors (Claydon) Limited | Wholesale & retail | 2013 |
| Highland Property (Framlingham) LLP | | 2021 |
| Highland Property Limited | Construction | 2003 |
| Highlite (UK) Limited | Wholesale & retail | 2009 |
| Highly Favoured Investment Properties Limited | Real estate | 2018 |
| Highview House Management (Ipswich) Limited | Real estate | 1996 |
| Highway Assurance Limited | Administrative & support | 2015 |
| Highwood Manor Management Company Limited | Households | 1996 |
| Hijack Gymnasium Limited | Arts & recreation | 2025 |
| HIK 4X4 Limited | Wholesale & retail | 2015 |
| Hikanotes Limited | Information & communication | 2017 |
| Hilevel Care Ltd | Health & social care | 2020 |
| Hill Farm Barns Ltd | Agriculture & fishing | 2021 |
| Hill Farm Ltd | Agriculture & fishing | 2022 |
| Hill Farms (Steeple) Limited | Agriculture & fishing | 1965 |
| Hill Street Motor Group Limited | Wholesale & retail | 2018 |
| Hillblue Limited | Administrative & support | 2008 |
| Hillfire Advisors Limited | Professional & scientific | 2003 |
| Hillingdon Park Management Company Limited | Households | 2013 |
| Hills & SON Ltd | Construction | 2024 |
| Hills Climate Control Ltd | Construction | 2020 |
| Hills Fiveways Ltd | Wholesale & retail | 2011 |
| Hilltorre Limited | Real estate | 1992 |
| Hilom Harana Limited | Professional & scientific | 2023 |
| Hils Penning Coaching Systems Ltd | Professional & scientific | 2025 |
| Hilton HR Limited | Administrative & support | 2018 |
| Himalayan Engineering Limited | Construction | 2025 |
| Himalayas Ecom Trading Ltd | Wholesale & retail | 2024 |
| Hindes Limited | Financial services | 2025 |
| Hindsight Homes Ltd | Real estate | 2020 |
| Hinkins Property Ltd | Real estate | 2025 |
| Hintlesham Barns Limited | Wholesale & retail | 2012 |
| Hintlesham Hall Hotel Limited | Hospitality | 2003 |
| Hipwell Bookbinders Ltd | Manufacturing | 2012 |
| Historika Klassik Ltd | Extraterritorial | 2014 |
| Historika Ltd | Wholesale & retail | 2017 |
| History Bound Limited | Information & communication | 2017 |
| Hivedemo Limited | Construction | 1987 |
| Hizzy Ltd | Real estate | 2017 |
| HJ Robertson Property Investment Limited | Real estate | 2023 |
| HJ Saxon Properties Ltd | Water & waste | 2025 |
| HJZ Freight Logistics Ltd | Transport & logistics | 2025 |
| HK Canopy and Flue Maintenance Services Ltd | Administrative & support | 2018 |
| HK Driving School Ltd | Education | 2025 |
| HKA Suffolk Limited | Real estate | 2025 |
| Hkhh and Company Limited | Real estate | 2024 |
| HM Chai House Ltd | Hospitality | 2026 |
| HMJ Contracts Ltd | Construction | 2020 |
| HMJ Electrical Ltd | Construction | 2021 |
| HMJ Group Limited | Financial services | 2021 |
| HMJ Homes Ltd | Construction | 2021 |
| Hmlk Ltd | Administrative & support | 2021 |
| Hmpr Barrier Systems Ltd | Construction | 2022 |
| Hmsportsmemorabilia Ltd | Wholesale & retail | 2026 |
| HN Healthcare Ltd | Health & social care | 2023 |
| Hndb Ltd | Real estate | 2024 |
| Hobday Land and Planning Limited | Administrative & support | 2024 |
| Holdan Fencing Limited | Construction | 2012 |
| Holden Group Limited | Professional & scientific | 2000 |
| Holden Timber Engineering Limited | Manufacturing | 1998 |
| Holden Timber Holdings Ltd | Financial services | 2023 |
| Holden Timber Property Ltd | Real estate | 2017 |
| Holdgood Limited | Administrative & support | 2008 |
| Hole Service Ltd | Construction | 2018 |
| Holistic Conversations Hub Ltd | Public administration | 2021 |
| Holland Water Services Limited | Construction | 2015 |
| Hollis Pilates Limited | Education | 2015 |
| Hollo World Limited | Other services | 2018 |
| Hollow Trees Farm Limited | Agriculture & fishing | 2005 |
| Holly Bleasdale Limited | Professional & scientific | 2011 |
| Hollyberry Lodge Ltd | Construction | 2020 |
| Hollycroft Financial Management Limited | Financial services | 2002 |
| Holmes & Wilson Ltd | Wholesale & retail | 2022 |
| Holmes Civils Ltd | Construction | 2020 |
| Holmes Electrical and Control Ltd | Manufacturing | 2025 |
| Holmes Plant and Construction Limited | Construction | 2004 |
| Holmes Travel Services Limited | Administrative & support | 2013 |
| Holmside Ventures Limited | Professional & scientific | 2023 |
| Holmy Limited | Professional & scientific | 2021 |
| Holo Sauce Ltd | Wholesale & retail | 2026 |
| Holt Hand Car Wash Ltd | Other services | 2022 |
| Holy Crustacean Ltd | Other services | 2020 |
| Holywell Logistics & Properties Ltd | Transport & logistics | 2011 |
| Holywells Holdings Limited | Financial services | 2016 |
| Holywells Property Limited | Real estate | 2019 |
| Holywells Residential Lettings Limited | Real estate | 2016 |
| Holywells Trading Limited | Agriculture & fishing | 2019 |
| Home 33 Ltd | Real estate | 2026 |