| Heritage 2 Limited | Real estate | 2018 |
| Heritage 3 Limited | Real estate | 2019 |
| Heritage Court Management Limited | Real estate | 1991 |
| Heritage Estate Group Limited | Construction | 2016 |
| Herm Services Limited | Financial services | 2019 |
| Hermes Racing Limited | Arts & recreation | 2021 |
| Herongate Management Company Limited | Households | 2017 |
| Hertfood Hub Ltd | Hospitality | 2024 |
| Hertford 16 Ltd | Other services | 2022 |
| Hertford Arts Hub | Education | 2016 |
| Hertford Barber Ltd | Other services | 2026 |
| Hertford Bathroom Company Ltd | Construction | 2025 |
| Hertford Build and Landscape Limited | Construction | 2022 |
| Hertford Building and Restoration Ltd | Construction | 2023 |
| Hertford Car Valeting Limited | Wholesale & retail | 2018 |
| Hertford Combat Academy Ltd | Arts & recreation | 2014 |
| Hertford Computer Consultants Ltd | Information & communication | 2012 |
| Hertford Cricket and Hockey Association Ltd | Arts & recreation | 2017 |
| Hertford Cycle Hub CIC | Arts & recreation | 2020 |
| Hertford Digital Ltd | Professional & scientific | 2018 |
| Hertford Embroidery & Design (HED) Ltd | Manufacturing | 2018 |
| Hertford Express Limited | Other services | 2020 |
| Hertford Fasttaxi Service Ltd | Transport & logistics | 2025 |
| Hertford FIC Limited | Real estate | 2024 |
| Hertford General Stores (HGS) Limited | Wholesale & retail | 2024 |
| Hertford Glass Commercial Limited | Construction | 2024 |
| Hertford Glass Limited | Extraterritorial | 1998 |
| Hertford Glass Windows Doors and Conservatories Ltd | Construction | 2023 |
| Hertford Glow Limited | Other services | 2015 |
| Hertford Hair Limited | Other services | 2011 |
| Hertford Healthcare Ltd | Manufacturing | 2011 |
| Hertford Heath Homes Limited | Real estate | 2026 |
| Hertford Jazz Limited | Arts & recreation | 2025 |
| Hertford Offset Limited | Manufacturing | 1974 |
| Hertford Optometry Limited | Health & social care | 2022 |
| Hertford Phone Surgery Limited | Manufacturing | 2025 |
| Hertford Picture Framing Ltd | Manufacturing | 2017 |
| Hertford Plans Ltd | Professional & scientific | 2021 |
| Hertford Property Services Limited | Real estate | 2011 |
| Hertford Sauce Company Ltd | Wholesale & retail | 2020 |
| Hertford Taxi Network Ltd | Transport & logistics | 2023 |
| Hertford Town Barbers Ltd | Other services | 2026 |
| Hertford Town Community Limited | Arts & recreation | 2014 |
| Hertfordshire Bathrooms Limited | Construction | 2018 |
| Hertfordshire Developments Limited | Construction | 2018 |
| Hertfordshire Garden Machinery Limited | Wholesale & retail | 2012 |
| Hertfordshire Gymnastic Club Limited | Arts & recreation | 2016 |
| Hertfordshire Polo Club Ltd | Arts & recreation | 2009 |
| Hertfordshire Rugby Football Union Limited | Arts & recreation | 2002 |
| Hertfordshire Vintage Toy Shop Limited | Wholesale & retail | 2025 |
| Herts & Essex Heat Ltd | Other services | 2006 |
| Herts & Essex Van Parts Ltd | Wholesale & retail | 2024 |
| Herts Academy of Beauty Limited | Administrative & support | 2015 |
| Herts Access Ltd | Administrative & support | 2021 |
| Herts Auto TEK Limited | Wholesale & retail | 2011 |
| Herts Bounce and Play Limited | Health & social care | 2025 |
| Herts Car Transport Limited | Transport & logistics | 2018 |
| Herts Caravan Services Ltd | Manufacturing | 2026 |
| Herts Deals Ltd | Information & communication | 2026 |
| Herts Drainage Services Limited | Water & waste | 2013 |
| Herts Drylining Systems Ltd | Construction | 2007 |
| Herts Electrical Contractors Limited | Construction | 2005 |
| Herts Financial Services Limited | Financial services | 2012 |
| Herts Firewood Ltd | Wholesale & retail | 2019 |
| Herts Garden Buildings Limited | Manufacturing | 2006 |
| Herts Hospitality Ltd | Hospitality | 2025 |
| Herts Lofts Ltd | Construction | 2023 |
| Herts Marketing Ltd | Professional & scientific | 2022 |
| Herts Metal Recycling Limited | Water & waste | 2017 |
| Herts Motion Ltd | Transport & logistics | 2024 |
| Herts Mulch & More Limited | Wholesale & retail | 2021 |
| Herts Plant Hire Ltd | Administrative & support | 2016 |
| Herts Plumbing and Heating Solutions Ltd | Construction | 2018 |
| Herts PPS Limited | Real estate | 2025 |
| Herts Property Services Limited | Real estate | 1997 |
| Herts Sealants Ltd | Construction | 2026 |
| Herts Therapy Ltd | Health & social care | 2021 |
| Hertsshield Ltd | Administrative & support | 2026 |
| Hertswel Digital Ltd | Professional & scientific | 2022 |
| Heyvenues Ltd | Information & communication | 2025 |
| HG Electrical Contractors Ltd | Construction | 2026 |
| HHB Estates Limited | Real estate | 2026 |
| HHH Consulting Ltd | Information & communication | 2022 |
| HI Spek Management Limited | Other services | 2024 |
| HI Xpress Ltd | Construction | 2013 |
| Hiberio Ltd | Construction | 2024 |
| Higgs Yard Flats Ltd | Households | 2011 |
| High Marford Court Limited | Households | 1972 |
| High NET Worth Health and Performance Ltd | Other services | 2025 |
| High-Tek Scaffolding (Bournemouth) Limited | Real estate | 2003 |
| High-Tek Scaffolding Limited | Construction | 2003 |
| Highbury Properties Limited | Construction | 2003 |
| Highfield Car Sales Limited | Wholesale & retail | 2023 |
| Highfield Farm (Mews) Management Limited | Households | 2005 |
| Highfield House Management Co. Limited | Households | 1999 |
| Highgrove Close Limited | Real estate | 2015 |
| Highwater House Management Company Limited | Real estate | 2023 |
| Hilde Pollet Limited | Professional & scientific | 2013 |
| Hill Brothers Holdings Limited | Financial services | 2020 |
| Hillside Nursery Developments Ltd | Construction | 2024 |