| Hicken Studios Ltd | Information & communication | 2022 |
| Hickman Analytics Limited | Information & communication | 2007 |
| Hickman Empire Ltd | Real estate | 2020 |
| Hicks Family Co Limited | Other services | 2022 |
| Hickson Media Limited | Administrative & support | 2006 |
| Hiconstruct Ltd | Construction | 2025 |
| Hidden Dragon Packaging Limited | Professional & scientific | 2024 |
| Hidden Homes Limited | Construction | 2022 |
| Hidden Lounge Limited | Hospitality | 2023 |
| Hidden Retreats Ltd | Real estate | 2019 |
| Hidden Skills CIC | Education | 2025 |
| Hiddengrin Ltd | Professional & scientific | 2021 |
| Hiddenlab Ltd. | Wholesale & retail | 2012 |
| Hideaway Country Holidays Ltd | Hospitality | 1972 |
| HIE Global Ltd | Information & communication | 2021 |
| Hield Brothers Plastics Ltd | Wholesale & retail | 2025 |
| Hiex 1 Limited | Real estate | 2025 |
| Hiex 2 Limited | Real estate | 2025 |
| Hiex 3 Limited | Real estate | 2025 |
| Hiex 4 Limited | Real estate | 2025 |
| Hifsa Ltd | Wholesale & retail | 2022 |
| Higgerty Ltd | Professional & scientific | 2012 |
| High Achiever Programme | Education | 2026 |
| High ASH Consultancy Limited | Professional & scientific | 2015 |
| High ASH Homes Limited | Households | 2015 |
| High ASH Investments Limited | Professional & scientific | 2010 |
| High ASH Ltd | Real estate | 2025 |
| High ASH Park Properties Ltd | Real estate | 2024 |
| High Barnes Ltd | Wholesale & retail | 2015 |
| High Cairn Ltd | Information & communication | 2016 |
| High Definition Brows Limited | Other services | 2008 |
| High Dimension Care Ltd | Health & social care | 2022 |
| High Esteem Carnival Designs Limited | Arts & recreation | 2016 |
| High Flyers Business Coaching Limited | Professional & scientific | 2006 |
| High Flyers Invest Limited | Financial services | 2019 |
| High Flying PR Ltd | Professional & scientific | 2013 |
| High Gables Heat LLP | | 2014 |
| High Gate Technologies Ltd | Wholesale & retail | 2024 |
| High Healthcare Ltd | Health & social care | 2022 |
| High Hopes Holdings Ltd | Real estate | 2019 |
| High House Mews Management Limited | Households | 1995 |
| High Level Celeste Ltd | Wholesale & retail | 2025 |
| High Level Media Agency Ltd | Professional & scientific | 2022 |
| High Manor Ltd | Real estate | 2025 |
| High Mobility Services Ltd | Manufacturing | 2025 |
| High Moor Court LLP | | 2020 |
| High Performance Dietitian Limited | Health & social care | 2014 |
| High Performance Through Engagement (David Smith) Ltd | Professional & scientific | 2010 |
| High Quality Tools Ltd | Wholesale & retail | 2022 |
| High Sky Properties Yorkshire Ltd | Real estate | 2021 |
| High Speed Ovens Limited | Hospitality | 2017 |
| High Street 1962 Limited | Extraterritorial | 2014 |
| High Trees Estates Limited | Real estate | 2003 |
| High Trees Garden and Leisure Limited | Wholesale & retail | 2014 |
| High View Windows UK Limited | Construction | 2011 |
| High Voltage Commissioning Solutions Ltd | Professional & scientific | 2025 |
| High Water Drinks Limited | Wholesale & retail | 1994 |
| Highclad Roofing Ltd | Construction | 2024 |
| Highclaim Ltd | Real estate | 2026 |
| Highcrest Distribution Limited | Wholesale & retail | 1999 |
| Higher Education Skills Work Ltd. | Professional & scientific | 2011 |
| Higher Finance Solutions Ltd | Professional & scientific | 2021 |
| Higher Purpose Cleaning Services Limited | Administrative & support | 2004 |
| Higher Standard Window Cleaning Ltd | Administrative & support | 2021 |
| Higher Standards Commercial Painting Limited | Construction | 2025 |
| Highfield Chase Management Co. Limited | Households | 1991 |
| Highfield Court (Yeadon) Management Company Limited | Households | 2001 |
| Highfield Court Residents (Huddersfield) Limited | Households | 2001 |
| Highfield Farm Holdings Limited | Agriculture & fishing | 2026 |
| Highfield Mews Management Company Limited | Hospitality | 1993 |
| Highfield Search Ltd | Administrative & support | 2015 |
| Highfield Sporting Limited | Agriculture & fishing | 2024 |
| Highfield Trading Limited | Professional & scientific | 2012 |
| Highgate Fields Limited | Real estate | 2021 |
| Highgrove Group (Aberdeen) Limited | Real estate | 2013 |
| Highgrove Group (Axiom) Limited | Financial services | 2022 |
| Highgrove Group (Belgravia Living) Limited | Extraterritorial | 2015 |
| Highgrove Group (Hoyland North) Limited | Real estate | 2022 |
| Highgrove Group (Junction 32) Limited | Real estate | 2017 |
| Highgrove Group (Reading) Limited | Real estate | 2012 |
| Highgrove Group PLC | Professional & scientific | 2004 |
| Highgrove Strategic Land Limited | Real estate | 2015 |
| Highland Crown Spirits Ltd | Wholesale & retail | 2025 |
| Highland Flower Rentals Ltd | Administrative & support | 2019 |
| Highlands Homeware Limited | Wholesale & retail | 2014 |
| Highlands RTM Company Limited | Households | 2004 |
| Highmoor Crescent Management Company Limited | Real estate | 1993 |
| Highmore Property Limited | Real estate | 2021 |
| Highridge Construction Limited | Construction | 2026 |
| Highstake Holdings Limited | Information & communication | 2026 |
| Highstreet Beds Limited | Manufacturing | 2026 |
| Hightop Developments Limited | Construction | 2002 |
| Highway Structures Limited | Professional & scientific | 2016 |
| Highways Leeds Limited | Hospitality | 2009 |
| Highwinds Management Company Limited | Households | 2011 |
| Highwood Security Holdings Limited | Real estate | 2024 |
| Highwood Security Limited | Manufacturing | 2002 |
| HIK Services Limited | Real estate | 2020 |
| Hikari (JP) Limited | Hospitality | 2025 |
| Hike Ware Ltd | Wholesale & retail | 2023 |