| Halma UK DS Limited | Professional & scientific | 2021 |
| Halma Ventures Limited | Professional & scientific | 2019 |
| Hamid Limited | Wholesale & retail | 2020 |
| Hamilton & Hamilton Ltd | Construction | 2006 |
| Hannes Immigration Services Ltd | Professional & scientific | 2024 |
| Hansys Limited | Information & communication | 2017 |
| Harbottle Investments Limited | Real estate | 2019 |
| Harbour Light Home Ltd | Health & social care | 2025 |
| Harford 2020 Limited | Construction | 2010 |
| Harford Renewables Ltd | Agriculture & fishing | 2018 |
| Harinezumi Limited | Information & communication | 2012 |
| Harinezumi Management Limited | Information & communication | 2023 |
| Haripriya Management Limited | Information & communication | 2025 |
| Harrys Film Logistics Ltd | Transport & logistics | 2026 |
| Harsant Pensioneer Trustees Ltd. | Financial services | 1995 |
| Hartgraph Limited | Manufacturing | 1981 |
| Harthope Property Ltd | Real estate | 2023 |
| HAS Beans (Coffee) Ltd | Wholesale & retail | 2025 |
| Hatherleigh Holdings Limited | Real estate | 2015 |
| Hats (on Demand) Ltd | Transport & logistics | 2010 |
| Hats Group Ltd | Transport & logistics | 1995 |
| Havares Limited | Real estate | 2020 |
| Havengate Ltd | Financial services | 2011 |
| Hawk Investment Properties Limited | Real estate | 2019 |
| Hawken Limited | Information & communication | 2012 |
| Haylee Music Limited | Information & communication | 2025 |
| Hayward Psychology Ltd | Education | 2025 |
| Haywood Restaurant Ltd | Hospitality | 2025 |
| Hazlemere Properties Limited | Real estate | 2024 |
| HCG Properties Ltd | Real estate | 2020 |
| HCR Consulting Ltd | Information & communication | 2023 |
| Head in the Cloud Development Ltd | Information & communication | 2017 |
| Healthcare and Transport Services Ltd | Transport & logistics | 2010 |
| Healthcare Cleaning Solutions Limited | Administrative & support | 2020 |
| Healthcare Personnel Solutions Ltd | Transport & logistics | 2010 |
| Heart Emissions Ltd | Administrative & support | 2017 |
| Heat Tech Services Limited | Construction | 2015 |
| Heathcrest Heating Services Limited | Construction | 2010 |
| Hemmen Properties Limited | Real estate | 2004 |
| Henry Lockhart Limited | Professional & scientific | 2018 |
| Herath Arkin Ltd | Professional & scientific | 2020 |
| Herath Associates Limited | Professional & scientific | 2004 |
| Heritage Hygiene Consultants Limited | Administrative & support | 2024 |
| Herlwyn Investments Ltd | Construction | 2024 |
| Heskel Hairdressing Limited | Other services | 2016 |
| Heyburt Limited | Professional & scientific | 2017 |
| Hgre Consultancy Limited | Professional & scientific | 2019 |
| HH Care Services Ltd | Administrative & support | 2020 |
| Hideaway Property Investments Limited | Hospitality | 2025 |
| High Hopes Portfolio Limited | Real estate | 2017 |
| High View Place Management Company Limited | Households | 2010 |
| Hill Road Properties Limited | Real estate | 2006 |
| Hinch Property Management Services Limited | Real estate | 2003 |
| HJM Consultancy Ltd | Professional & scientific | 2025 |
| HMF Tools & Fixings Limited | Wholesale & retail | 2012 |
| HNF Financial Solutions Ltd | Financial services | 2016 |
| Ho&W Consultancy Services Limited | Professional & scientific | 2013 |
| Holding Hands Pre-School Ltd | Education | 2014 |
| Holiday Mode Limited | Financial services | 2018 |
| Holisticomm Ltd | Professional & scientific | 2016 |
| Holland Construction Limited | Construction | 2024 |
| Holmeship.Com Ltd | Health & social care | 2015 |
| Holywell Convenience Store Ltd | Wholesale & retail | 2013 |
| Honey Consultancy Ltd | Information & communication | 2011 |
| Honour Design Limited | Professional & scientific | 2009 |
| Hops Cottage Management Company Ltd | Households | 2021 |
| House of Hildi Limited | Wholesale & retail | 2022 |
| House of Willow Limited | Real estate | 2024 |
| Housewrights Limited | Real estate | 1987 |
| Hpc-Tech Limited | Information & communication | 2021 |
| HPS Springbank Ltd | Construction | 2021 |
| HSB Development 1 Limited | Construction | 2025 |
| HSB Development 2 Limited | Construction | 2025 |
| HSB Investments Ltd | Wholesale & retail | 2018 |
| Huber Europe Limited | Transport & logistics | 2017 |
| Huber UK Limited | Professional & scientific | 2018 |
| Humphrey Thompson Enterprises Limited | | 1964 |
| Humphries Medical Limited | Health & social care | 2018 |
| Humphries Medical Services Ltd | Other services | 2024 |
| Huntriss Limited | Financial services | 2023 |
| Hussain Ventures Ltd | Education | 2025 |
| Hutchings Consultants Limited | Administrative & support | 2002 |
| Hutchings Consultants Trustees Limited | Other services | 2025 |
| Hydrosmart International Limited | Manufacturing | 2001 |
| Hypercolour Ltd | Information & communication | 2006 |
| Hypothec Limited | Professional & scientific | 2025 |
| I & V Limited | Real estate | 2025 |
| I Love IT There Ltd | Professional & scientific | 2019 |
| I Soft Solutions Ltd | Information & communication | 2015 |
| I Want This Ltd | Manufacturing | 2020 |
| I&M Limited | Construction | 2007 |
| I.C. Adapt Limited | Professional & scientific | 2014 |
| IAN Culverhouse & Co. Limited | Real estate | 1976 |
| IAN Telford Real Estate Limited | Real estate | 2026 |
| Iantelfordjohnnash&Oo Limited | Real estate | 2026 |
| Ice Consulting Limited | Professional & scientific | 2021 |
| Icewell Limited | Real estate | 1997 |
| ID EST Creative Hub Limited | Wholesale & retail | 2021 |
| Ideal Mortgages London Limited | Financial services | 2012 |
| Ideanpay UK Ltd | Professional & scientific | 2020 |