| H45 Ltd | Other services | 2019 |
| Habitual Wealth Ltd | Professional & scientific | 2024 |
| Halen Wealth Limited | Financial services | 2018 |
| Half Moon Dental Surgery Limited | Health & social care | 2020 |
| Hallows Care Limited | Health & social care | 2007 |
| Hamptons Inventories Limited | Construction | 2019 |
| Happy Box UK Ltd | Wholesale & retail | 2023 |
| Harbour Mortgage Solutions Ltd | Financial services | 2021 |
| Hardcastle Business Support Limited | Professional & scientific | 2015 |
| Harlech Industrial Doors Limited | Manufacturing | 1977 |
| Harlequin Quality Management Limited | Professional & scientific | 2014 |
| Harmesh Developments Ltd | Real estate | 2016 |
| Harmesh Property Holding Ltd | Real estate | 2016 |
| Harper Hope Investments (UK) Ltd | Financial services | 2022 |
| Harreli Limited | Financial services | 2019 |
| Harrhy Holdings Limited | Financial services | 2026 |
| Hasanah | Other services | 2018 |
| Haul-Marc Grab Hire Services Ltd | Transport & logistics | 2022 |
| Have Your SAY Stories Ltd | Information & communication | 2019 |
| Haverstock Hill RTM Company Limited | Households | 2008 |
| Hawkins Antiques & Reproductions (Barry) Limited | Manufacturing | 2016 |
| Hawkins Antiques Limited | Wholesale & retail | 2016 |
| Hawkins Postproduction Limited | Information & communication | 2015 |
| Haya (UK) Limited | Wholesale & retail | 2008 |
| Haylow Limited | Administrative & support | 2022 |
| Haymes Homes Ltd | Real estate | 2025 |
| Hayward Williams Limited | Professional & scientific | 1999 |
| Hazy Daze Equine Ltd | Agriculture & fishing | 2024 |
| Heal the Ouch Ltd | Health & social care | 2024 |
| Health HWB Ltd | Health & social care | 2025 |
| Healthbid Solutions Limited | Administrative & support | 2024 |
| Healthcare Placement Services Ltd | Real estate | 2025 |
| Hearten Horticulture Ltd | Information & communication | 2021 |
| Heavenly Vegan Coffi Ltd | Hospitality | 2024 |
| Hedfan Consulting Limited | Professional & scientific | 2013 |
| Hedgerows (Designs From the Wood) Limited | | 1987 |
| Helford Engineering Ltd | Professional & scientific | 2023 |
| Heol Y Gaer Management Limited | Households | 2015 |
| Herbert Survey Solutions Ltd | Professional & scientific | 2025 |
| Heritage LCV Limited | Wholesale & retail | 2016 |
| Herllo Ltd | Transport & logistics | 2022 |
| Heroes Rights | Administrative & support | 2018 |
| HGS Management Consultant Limited | Financial services | 2013 |
| HI Handyman & Property Services Ltd | Construction | 2025 |
| Hi-Tec Limited | Manufacturing | 2024 |
| Hicks and Mortar Ltd | Real estate | 2021 |
| High Street Inns Ltd | Hospitality | 2025 |
| High Street Lettings Limited | Real estate | 2019 |
| High Voltage Group CIC | Health & social care | 2021 |
| Highfield Close (Barry) Management Ltd | Households | 2014 |
| Hill & Hearth Limited | Wholesale & retail | 2025 |
| Hill & Home Lettings Ltd | Real estate | 2025 |
| Hirk Ltd | Real estate | 2021 |
| HIS and HER Quarters Limited | Other services | 2019 |
| HJ Accountancy Services Ltd | Professional & scientific | 2020 |
| HLD Engineering Limited | Construction | 2019 |
| HMD Property Investments Ltd | Real estate | 2023 |
| Hobsons Building Services Ltd | Construction | 2018 |
| Hodges Development & Design Limited | Real estate | 2016 |
| Holland Road Haulage Limited | Transport & logistics | 2025 |
| Hollywood Nail Spa Barry Limited | Other services | 2024 |
| Holton Reach Management Company Limited | Households | 2005 |
| Holton Road Studios Ltd | Arts & recreation | 2024 |
| Home Rescue Co. Limited | Other services | 2018 |
| Honeybelle Boutique Ltd | Wholesale & retail | 2026 |
| Hope Bags C.I.C. | Education | 2023 |
| Horizon Car Care Ltd | Administrative & support | 2024 |
| Horizons Horticulture Limited | Administrative & support | 2020 |
| Hot Diggidy Dog Limited | Manufacturing | 2009 |
| Hot Pizza and Kebabs Limited | Hospitality | 2025 |
| House 2 Home Sales and Lettings Ltd | Real estate | 2025 |
| Howard Court Management Company Limited | Households | 1972 |
| Howe Motors Limited | Wholesale & retail | 2003 |
| HQ1 Management Limited | Professional & scientific | 2022 |
| HQ2 the Salon Ltd | Other services | 2015 |
| Hrizons Management Consulting Ltd | Administrative & support | 2013 |
| HT Group Ltd | Hospitality | 2023 |
| Hulme Aviation Consultants Ltd | Professional & scientific | 2018 |
| Hungry Shark (UK) Limited | Hospitality | 2025 |
| Hungry Shark 2026 UK Limited | Hospitality | 2026 |
| Hurley Grounds Maintenance Ltd | Construction | 2025 |
| HUW Williams (ENT) Ltd | Health & social care | 2016 |
| Hy-Press Limited | Manufacturing | 2025 |
| Hy-Standard Ltd | Extraterritorial | 2013 |
| Hybridge Solutions Limited | Information & communication | 2022 |
| Hype Tribe Ltd | Administrative & support | 2024 |
| Hyper Value Barry Island Ltd | Extraterritorial | 2023 |
| Hyper Value Limited | Wholesale & retail | 2020 |
| I & N Watts Ltd. | Construction | 2015 |
| I SPY Pies Ltd | Hospitality | 2024 |
| IAN Lowe Limited | Professional & scientific | 1998 |
| Ibubble Ltd | Real estate | 2025 |
| ICR Solution UK Ltd | Construction | 2020 |
| Ideaswecreate Limited | Wholesale & retail | 2024 |
| Ietwin Ltd | Hospitality | 2023 |
| ILA Visa Ltd | Professional & scientific | 2013 |
| Ilminster Home Improvements Ltd | Professional & scientific | 2023 |
| Iltocomps Ltd | Arts & recreation | 2025 |
| IMC Consulting Solutions Ltd | Education | 2020 |
| Imeus Healthcare Ltd | Administrative & support | 2020 |