| Handy Dryers Limited | Extraterritorial | 2018 |
| Handydryers Holdings Limited | Financial services | 2025 |
| Hannah Abbott Copywriting Ltd | Professional & scientific | 2020 |
| Happy Dave Limited | Health & social care | 2023 |
| Haras Investments Limited | Extraterritorial | 1933 |
| Harbourfields (Oxted) Limited | Hospitality | 2024 |
| Harbourfields (Tunbridge Wells) Limited | Hospitality | 2022 |
| Harbourfields Group Holdings Limited | Financial services | 2022 |
| Harbourline Property Ltd | Real estate | 2025 |
| Hari Anderson Ltd | Wholesale & retail | 2025 |
| Harlow Computer Services Limited | Other services | 2014 |
| Harmans Yard RTM Company Limited | Households | 2012 |
| Harmonic Health Limited | Wholesale & retail | 2024 |
| Harnel Homes Foxley Ltd | Construction | 2021 |
| Harper MAY Limited | Other services | 2019 |
| Harrington Windows Limited | Construction | 2024 |
| Harris Barber Lounge Limited | Other services | 2020 |
| Harrison Belle Cars Limited | Wholesale & retail | 2023 |
| Harrison Read Ltd | Information & communication | 2021 |
| Harry Stafford Holdings Ltd | Financial services | 2024 |
| Hart LEA Management Company Limited | Real estate | 2021 |
| Hartleyco 2.0 Ltd | Information & communication | 2025 |
| Harvest Beautie Limited | Wholesale & retail | 2021 |
| Harvey Technologies Ltd | Financial services | 2020 |
| HAS Accountancy Ltd | Professional & scientific | 2018 |
| Hassobury Assets Limited | Extraterritorial | 1997 |
| Hassobury Mansion Management Limited | Administrative & support | 1998 |
| Hastingwood Court RTE Limited | Households | 2011 |
| Hatfield Broad Oak Youth Football Club Ltd | Education | 2022 |
| Havendele Ltd | Real estate | 2025 |
| Havers Fish Limited | Hospitality | 2012 |
| Havers Laundry Ltd | Other services | 2025 |
| Havynpay Ltd | Information & communication | 2025 |
| Hayte Artworking Ltd | Other services | 2025 |
| Hayters Retirement Benefits Plan Trustee Limited | Financial services | 2012 |
| HBC Warranties Ltd | Financial services | 2024 |
| HBO Sports and Community Club Limited | Arts & recreation | 2010 |
| HBS Unity Ltd | Real estate | 2023 |
| HD Clinical Limited | Information & communication | 2005 |
| HDS Storage Ltd | Transport & logistics | 2023 |
| Head to Market Ltd | Professional & scientific | 2017 |
| Health & Safety Project Engineering Ltd | Professional & scientific | 2016 |
| Health and Protection Limited | Financial services | 2015 |
| Health IQ Deals Ltd | Wholesale & retail | 2021 |
| Hearing on the Heath Limited | Health & social care | 2024 |
| Heather Curtis Limited | Administrative & support | 2023 |
| Heavy Goods Brake Testers UK Limited | Construction | 2021 |
| Hedef Finance Ltd | Professional & scientific | 2020 |
| Hedgehog Properties Limited | Professional & scientific | 2018 |
| Hedgerows Real Estate Limited | Real estate | 2024 |
| Hedspace Consulting Ltd | Professional & scientific | 2020 |
| Helen Williams Consultancy Ltd | Professional & scientific | 2022 |
| Helin 77 Ltd | Hospitality | 2025 |
| Hellier Watt Consulting Limited | Professional & scientific | 2024 |
| Hellonorthlondon Limited | Professional & scientific | 2018 |
| Hemsley & Hemsley Limited | Hospitality | 2011 |
| Hendo Enterprise Ltd | Transport & logistics | 2025 |
| Hendrie Limited | Construction | 2016 |
| Henham Lodge Barns Management Company Limited | Households | 2007 |
| Henham Tavern Ltd | Hospitality | 2020 |
| Henry James Landscaping Ltd | Construction | 2019 |
| Herbert & Sons (Feeds) Limited | Agriculture & fishing | 2011 |
| Hersync Studio Ltd | Arts & recreation | 2026 |
| Hertford Co SEC & Accountancy Limited | Professional & scientific | 2021 |
| Hertford Swimming Pools Maintenance Limited | Other services | 2020 |
| Herts & Essex Multi Academy Trust | Education | 2013 |
| Herts & Essex Properties Limited | Real estate | 2015 |
| Hestia Limited | Real estate | 2011 |
| Hextalls Limited | Professional & scientific | 2009 |
| Hextalls PB Limited | Administrative & support | 2011 |
| HG UKI Ltd | Wholesale & retail | 1999 |
| Hgv@Gmx Limited | Transport & logistics | 2024 |
| HH Online Enterprise Ltd | Wholesale & retail | 2025 |
| HHC Consulting Limited | Professional & scientific | 2024 |
| HHH CSS RTM Company Limited | Households | 2019 |
| Hi-Q Deals Limited | Professional & scientific | 2019 |
| Hibaero Limited | Other services | 2025 |
| Hideaway Retreat (London) Ltd | Other services | 2022 |
| Hifmk Limited | Wholesale & retail | 2024 |
| High Lane Residents Association Limited | Households | 1982 |
| High Places Associates Limited | Education | 2024 |
| High View Residents Association (Birchanger) Limited | Households | 1979 |
| HIGHEND22 Ltd | Administrative & support | 2019 |
| Hightons the Jewellers | Transport & logistics | 1985 |
| Highways Supplies (South East) Ltd | Manufacturing | 2019 |
| Hillcroft Mews Management Limited | Real estate | 2024 |
| Hills Inventories Ltd | Households | 2021 |
| Hilton & Moss Sportscars Limited | Wholesale & retail | 2001 |
| Hilton Properties Limited | Real estate | 1994 |
| Hilton Rental Limited | Administrative & support | 2011 |
| Hilton Vehicle Leasing Limited | Administrative & support | 2008 |
| Hippodrome Mews Management Company Limited (the) | Households | 1973 |
| Hire Wave Logistics Ltd | Transport & logistics | 2026 |
| Hiremee Limited | Administrative & support | 2015 |
| Historical Pact Limited | Professional & scientific | 2024 |
| Hiteck Security Limited | Administrative & support | 2022 |
| HK Lau's Limited | Wholesale & retail | 2021 |
| HNE Media Services Limited | Information & communication | 2016 |
| Hockerill Anglo-European College Ltd. | Education | 2011 |
| Hockerill Consulting Limited | Information & communication | 2009 |