| HB Mine Development Ltd | Professional & scientific | 2026 |
| HB South West Limited | Construction | 2007 |
| HC Group (South West) Limited | Financial services | 2024 |
| HC Lets Ltd | Real estate | 2024 |
| Hcrt Limited | Information & communication | 2017 |
| HD Chemicals Limited | Wholesale & retail | 2018 |
| HD Developments (SW) Ltd | Construction | 2022 |
| HD Waste Removals Ltd | Water & waste | 2026 |
| Hdjd Limited | Hospitality | 2022 |
| Head Electrical Services Ltd | Construction | 2020 |
| Headland Park Developments Limited | Construction | 2006 |
| Headline Barbers (SW) Ltd | Other services | 2017 |
| Headline Barbers 2 Ltd | Other services | 2018 |
| Headline Barbers Crownhill Ltd | Other services | 2024 |
| Headline Barbers Devon Ltd | Other services | 2022 |
| Headline Unisex (SW) Ltd | Other services | 2023 |
| Headline Unisex Ltd | Other services | 2019 |
| Headway Plymouth | Health & social care | 2012 |
| Heal Your Confidence Community Interest Company | Education | 2022 |
| Healbee Ltd | Other services | 2011 |
| Healery Health Ltd | Health & social care | 2023 |
| Healing Movements Ltd | Health & social care | 2025 |
| Health & Safety Matters (South West) Limited | Professional & scientific | 2022 |
| Health Life Prosperity Shared Ltd | Information & communication | 2018 |
| Healthero Limited | Wholesale & retail | 2022 |
| Healthier Nutrition Ltd | Wholesale & retail | 2022 |
| Healthserg Limited | Health & social care | 2009 |
| Healthy Pulses Ltd | Wholesale & retail | 2026 |
| Heart Surgery South West Limited | Health & social care | 2014 |
| Heartswell South West Limited | Administrative & support | 2002 |
| Hearty Meals 2 U Limited | Hospitality | 2023 |
| Heatcare South West Limited | Construction | 2005 |
| Heatform Ltd | Wholesale & retail | 2025 |
| Heather Tree Ltd | Health & social care | 2018 |
| Heathfield Properties Limited | Real estate | 1960 |
| Heathlex Limited | Wholesale & retail | 2012 |
| Heating and Appliances Ltd | Manufacturing | 2015 |
| Heaven’S Microgreens Ltd | Agriculture & fishing | 2022 |
| Hector Chef Ltd | Hospitality | 2025 |
| Hedera Carpentarius Ltd | Manufacturing | 2026 |
| Hedgeland Property Consultants Limited | Real estate | 2016 |
| HEG Services Limited | Construction | 2007 |
| Helen Tugwell & Co Limited | Wholesale & retail | 2008 |
| Helios Blue Holdings Limited | Financial services | 2025 |
| Hello CBD Shop Limited | Manufacturing | 2019 |
| Hellostocks Ltd | Information & communication | 2025 |
| Helnexala Limited | Wholesale & retail | 2025 |
| Help With Divorce Club Limited | Other services | 2022 |
| Helston Homes Limited | Real estate | 1988 |
| Hembury Estates Limited | Real estate | 2020 |
| Hemerdon Land LLP | | 2010 |
| Hemerdon Podiatry Limited | Health & social care | 2025 |
| Hemisphere Rigging Services Ltd | Manufacturing | 2003 |
| Hemp Holistics Ltd | Agriculture & fishing | 2018 |
| Hempademics Ltd | Professional & scientific | 2025 |
| Hempuk Ltd | Manufacturing | 2020 |
| Hemsford Management Limited | Households | 1998 |
| Hemsley Fraser Group Limited | Professional & scientific | 1991 |
| Hemsley Fraser International Limited | Professional & scientific | 2001 |
| Henderson Web Design Limited | Information & communication | 2003 |
| Henley & Marlow Accounting Limited | Professional & scientific | 2010 |
| Heppz Security Ltd | Administrative & support | 2019 |
| Herbal Dimensions Ltd | Wholesale & retail | 2022 |
| Herculean Supplements Ltd | Hospitality | 2025 |
| Heritage Aluminium Windows Limited | Construction | 2025 |
| Heritage Software Ltd | Information & communication | 2006 |
| Heritage Upholstery & Interiors Ltd | Manufacturing | 2023 |
| Heritage Windows Direct Ltd | Manufacturing | 2026 |
| Hermosa Hair Company Limited | Other services | 2015 |
| Heron Valley Cider Limited | Manufacturing | 1997 |
| Hertford Investors Ltd | Professional & scientific | 2015 |
| Heslopfba Ltd | Wholesale & retail | 2026 |
| Hessian Assure Ltd | Administrative & support | 2023 |
| Hestonbrook Ltd | Professional & scientific | 2009 |
| Heswall Property Services Ltd | Real estate | 2021 |
| Heswall Transport Services Ltd | Transport & logistics | 2018 |
| Hewaautomotors Limited | Wholesale & retail | 2021 |
| HEX 360 Ltd | Construction | 2017 |
| HEX 360 Project Management Limited | Construction | 2018 |
| HEX360 Group Ltd | Construction | 2019 |
| HEX360 Management Ltd | Households | 2019 |
| Hexagon Holdings Property Group Limited | Real estate | 2024 |
| HEY Cat! Studios Ltd | Information & communication | 2021 |
| HEY Kitchen Limited | Hospitality | 2021 |
| Heybrook Bay PUB Ltd | Hospitality | 2015 |
| Heybrook Heating Ltd | Energy | 2020 |
| Heybrook Holdings Ltd | Real estate | 2015 |
| Heyl Bakery Ltd | Manufacturing | 2020 |
| Heynes Planning Ltd | Construction | 2011 |
| HFP Trading Limited | Agriculture & fishing | 2024 |
| HFY Rentals Limited | Administrative & support | 2023 |
| HGL Autoservices Limited | Wholesale & retail | 2015 |
| HH Elburton Limited | Hospitality | 2021 |
| HH Hair Ltd | Other services | 2019 |
| Hhiltonmediaservices Limited | Information & communication | 2017 |
| Hickmandunneholdings Limited | Arts & recreation | 2025 |
| Hicks Flooring SW Limited | Construction | 2022 |
| Hicks Project Services Ltd | Information & communication | 2021 |
| Hidden Lives Counselling and Support Hub CIC | Health & social care | 2021 |
| Hidden Soul Ltd | Hospitality | 2024 |