| Hampton (Woburn Sands) Ltd | Real estate | 2018 |
| Hampton Brook (Desborough) Limited | Construction | 2005 |
| Hampton Brook (UK) Ltd | Construction | 2014 |
| Hampton Brook Limited | Real estate | 1992 |
| Hampton Capital Hotel Propco Ltd | Hospitality | 2024 |
| Hampton Car Sales Ltd | Wholesale & retail | 2022 |
| Hampton Care Woburn Sands Ltd | Health & social care | 2022 |
| Hampton Crown Hotel & Lounge Ltd | Hospitality | 2024 |
| Hampton Frames Limited | Wholesale & retail | 2006 |
| Hampton Healthcare Group Ltd | Health & social care | 2016 |
| Hampton Healthcare Management Ltd | Professional & scientific | 2022 |
| Hampton Heritage Construction Limited | Construction | 2025 |
| Hampton Knight Limited | Professional & scientific | 2001 |
| Hampton Security Ltd | Administrative & support | 2023 |
| Hampton the Grange Ltd | Real estate | 2022 |
| Hamptons Design and Build (Northampton) Limited | Manufacturing | 2022 |
| Hamsafar Limited | Real estate | 2019 |
| Hamsard 3539 Limited | Extraterritorial | 2019 |
| Hamsard 3772 Limited | Extraterritorial | 2024 |
| Hamsi Services Limited | Construction | 2022 |
| Hamson Learning Ltd | Education | 2022 |
| Hamza Online Limited | Wholesale & retail | 2021 |
| Hana Lili HQ Ltd | Information & communication | 2024 |
| Hanavine Limited | Real estate | 2026 |
| Hancock Surveys Ltd | Construction | 2026 |
| Hancote Ltd | Information & communication | 2024 |
| Hand Technology Ltd | Information & communication | 2019 |
| Handcrafted by Woodworks Limited | Construction | 2018 |
| Handley's Property Services Ltd | Construction | 2023 |
| Handsome HAM Limited | Wholesale & retail | 2010 |
| Hank Tree Ltd | Real estate | 2020 |
| Hankins Engineering Limited | Manufacturing | 2013 |
| Hanley Associates Limited | Professional & scientific | 2001 |
| Hanlincrest Limited | Manufacturing | 1991 |
| Hanna Brothers PUB Co Ltd | Hospitality | 2017 |
| Hannah Rose Weddings & Events Ltd | Administrative & support | 2026 |
| Hannah’S Hairdressing and Barber Salon Ltd | Other services | 2025 |
| Hannent Corbett Ltd | Professional & scientific | 2019 |
| Hannes Digital Limited | Professional & scientific | 2015 |
| Hannington ASH Ltd | Other services | 2018 |
| Hanry Ltd | Real estate | 2023 |
| Hansen Corporation Ltd | Wholesale & retail | 2024 |
| Hansglo Ltd | Wholesale & retail | 2020 |
| Hanson Cooling Services Limited | Construction | 2003 |
| Hanson Creatives Limited | Professional & scientific | 2012 |
| Hanumana Investments Limited | Real estate | 2021 |
| Hanumana Limited | Real estate | 2020 |
| Hanwell Footwear Services Ltd | Professional & scientific | 2020 |
| Hapas Centre for Young People and Families CIC | Education | 2026 |
| Happi 2022 Limited | Hospitality | 2022 |
| Happier Every Chapter Ltd | Other services | 2020 |
| Happily Ever Latte Limited | Hospitality | 2025 |
| Happiness Enterprises Limited | Construction | 2010 |
| Happy Business Hub Limited | Wholesale & retail | 2022 |
| Happy Chappies Limited | Other services | 2011 |
| Happy Ducks Events Ltd | Arts & recreation | 2025 |
| Happy Dynasty Limited | Hospitality | 2025 |
| Happy Ending Ltd | Professional & scientific | 2014 |
| Happy Hands Ltd | Education | 2009 |
| Happy Happy Children Ltd | Wholesale & retail | 2025 |
| Happy Hippo Foods Ltd | Manufacturing | 2020 |
| Happy Home Logistics Ltd | Transport & logistics | 2025 |
| Happy Living With Sarah Ltd | Administrative & support | 2020 |
| Happy Nicholas Limited | Construction | 2019 |
| Happy to Help (Northampton) Community Interest Company | Other services | 2018 |
| Happy Wolf PUB Company Ltd | Hospitality | 2020 |
| HAPPYCARS247 Limited | Transport & logistics | 2024 |
| Happydays Homecare Services Ltd | Administrative & support | 2021 |
| HAR Enterprises Limited | Wholesale & retail | 2025 |
| Harborough Connect Ltd | Transport & logistics | 2026 |
| Harbour 32 Limited | Professional & scientific | 2010 |
| Harbour 5 Limited | Real estate | 2024 |
| Harbur Park & Leisure Homes Ltd | Manufacturing | 2021 |
| Harby Dynamic Ltd | Professional & scientific | 2022 |
| Harcourt Mews Management Limited | Households | 2016 |
| Hard 6 Restaurants Limited | Extraterritorial | 2007 |
| Hard 8 Restaurants Limited | Hospitality | 2006 |
| Hard Four Consultancy Limited | Professional & scientific | 2007 |
| Hard Landscaping Supplies Limited | Wholesale & retail | 2019 |
| Hard Raccoon Limited | Professional & scientific | 2012 |
| Harding Construction Management Ltd | Professional & scientific | 2023 |
| Hardingstone Car Care Center Ltd | Wholesale & retail | 2018 |
| Hardingstone Construction Ltd | Construction | 2018 |
| Hardingstone Day Nursery Limited | Health & social care | 2011 |
| Hardingstone Roofing Ltd | Construction | 2025 |
| Hardline Motorsport Ltd | Arts & recreation | 2026 |
| Hare & Bone Ltd | Administrative & support | 2013 |
| Hare Wines Limited | Wholesale & retail | 2014 |
| Harea Construction Limited | Construction | 2014 |
| Harea Homes Ltd | Construction | 2019 |
| Hares Accountants Ltd | Professional & scientific | 2022 |
| Harfield Properties Limited | Real estate | 2024 |
| Haria Investments Limited | Real estate | 2016 |
| Haris Architectural Systems Ltd | Manufacturing | 2023 |
| Harke Electrical Ltd | Construction | 2024 |
| Harkness Properties Ltd | Real estate | 2023 |
| Harlequin Headboards Ltd | Manufacturing | 2019 |
| Harleston Road Management Company Limited | Real estate | 2015 |
| Harlestone Car Valeting Ltd | Other services | 2016 |
| Harlestone Close Management Limited | Professional & scientific | 2014 |