| Haohaoz Limited | Real estate | 2024 |
| Haov & Co | | 1994 |
| Haoyun YU Ltd | Hospitality | 2020 |
| Happiness IS EGG Shaped Ltd | Professional & scientific | 2025 |
| Happy Bert Ltd | Information & communication | 2017 |
| Happy Burrows Ltd | Real estate | 2025 |
| Happy Dog Productions Ltd | Information & communication | 2025 |
| Happy E Ltd | Hospitality | 2023 |
| Happy Free Digitale Nomade LP | | 2020 |
| Happy Harvest Scotland Ltd | Hospitality | 2014 |
| Happy Holidays Ltd | Administrative & support | 2023 |
| Happy IT Ltd | Information & communication | 2025 |
| Happy People Initiatives Limited | Information & communication | 2026 |
| Happy Place Ltd | Professional & scientific | 2015 |
| Happy SAD Productions Ltd | Arts & recreation | 2023 |
| Happy Salt Limited | Hospitality | 2025 |
| Happy Takeaway Group Ltd | Other services | 2016 |
| Happy to Help Van Ltd | Transport & logistics | 2019 |
| Happy Transports Ltd | Transport & logistics | 2021 |
| Happy Venus LP | | 2015 |
| Happyness Limited | Arts & recreation | 2010 |
| Happysense Ltd | Other services | 2017 |
| Happysoft Ltd | Information & communication | 2021 |
| Happytalk English Limited | Professional & scientific | 2003 |
| Happyworm Limited | Information & communication | 2000 |
| Haque ED Limited | Real estate | 2025 |
| Harasat Enterprises LP | | 2014 |
| Harborview Homes Limited | Real estate | 2021 |
| Harbour Business Centres Ltd | Real estate | 2012 |
| Harbour Cafe Fisherrow Ltd | Hospitality | 2019 |
| Harbour Connections CIC | Administrative & support | 2016 |
| Harbour Energy PLC | Professional & scientific | 2002 |
| Harbour Multi-Trades Limited | Construction | 1999 |
| Harbour Realty Ltd | Real estate | 2022 |
| Harbourcrest Partners LLP | | 2025 |
| Harbourvest 2016 Global AIF L.P. | | 2014 |
| Harbourvest 2017 Global AIF L.P. | | 2016 |
| Harbourvest 2018 Global AIF L.P. | | 2017 |
| Harbourvest 2018 Global Feeder AIF L.P. | | 2017 |
| Harbourvest Asia Pacific Viii AIF L.P. | | 2016 |
| Harbourvest Dover Street IX Investment L.P. | | 2015 |
| Harbourvest GP Limited | Administrative & support | 2014 |
| Harbourvest Nespf L.P. | | 2020 |
| Harbourvest Nest Co-Investment L.P. | | 2022 |
| Harbourvest Partners Co-Investment IV AIF L.P. | | 2015 |
| Harbourvest Partners Co-Investment V AIF L.P. | | 2017 |
| Harbourvest Partners Co-Investment V Feeder AIF L.P. | | 2017 |
| Harbourvest Partners X AIF Buyout L.P. | | 2014 |
| Harbourvest Partners X AIF L.P. | | 2014 |
| Harbourvest Partners X AIF Venture L.P. | | 2014 |
| Harbourvest Partners XI AIF L.P. | | 2017 |
| Harbourvest Partners XI Buyout AIF L.P. | | 2017 |
| Harbourvest Partners XI Micro Buyout AIF L.P. | | 2017 |
| Harbourvest Partners XI Venture AIF L.P. | | 2017 |
| Harbourvest Real Assets III AIF L.P. | | 2015 |
| Harbourvest Red Dragon L.P. | | 2022 |
| Harbourvest Skew Base AIF L.P. | | 2017 |
| Harbourvest TBW L.P. | | 2019 |
| Harbridge Investments L.P. | | 2012 |
| Harburn Heating Solutions Ltd | Wholesale & retail | 2023 |
| Harburn Hobbies Limited | Wholesale & retail | 1959 |
| Harbyn Properties Kellas LLP | | 2023 |
| Harcharsand Limited | Administrative & support | 2019 |
| Hard HAT Jobs Ltd | Information & communication | 2013 |
| Hard Pressed Cider Distribution LLP | | 2016 |
| Hard Systems L.P. | | 2010 |
| Harden Trade LP | | 2015 |
| Hardgate Painting Contracts Ltd. | Construction | 2009 |
| Hardgraft International LP | | 2016 |
| Hardies Investments Ltd | Hospitality | 2025 |
| Harding Partners | | 1999 |
| Hardman Homes Limited | Real estate | 2024 |
| Hardscrabble (UK) Investment Holdings Limited | Financial services | 2016 |
| Hardware Business LP | | 2016 |
| Hardwell Holdings Ltd | Real estate | 2022 |
| Hare Capulet Limited | Hospitality | 2023 |
| Hare Construction Management Ltd | Construction | 2024 |
| Harelaw Wind Turbine Limited | Professional & scientific | 2014 |
| Hareness Circle LLP | | 2024 |
| Harewood END Ltd | Transport & logistics | 2022 |
| Harfield Investments L.P. | | 2009 |
| Haricastra Capital LP | | 2014 |
| Haris Hussain Ltd | Wholesale & retail | 2022 |
| Hariss Cafe Ltd | Hospitality | 2026 |
| Harithi Property Ltd | Real estate | 2022 |
| Harkins & Vickers Electrical Solutions Ltd | Construction | 2025 |
| Harkins Properties Ltd | Real estate | 2023 |
| Harlaw Consult LP | | 2016 |
| Harlequin Homes (Scotland) Limited | Professional & scientific | 1998 |
| Harleston Impex LP | | 2013 |
| Harlex Business LP | | 2015 |
| Harlex Export LP | | 2015 |
| Harlex Marketing LP | | 2015 |
| Harlex Projects LP | | 2014 |
| Harlex Services LP | | 2015 |
| Harlex Technologies (UK) LP | | 2014 |
| Harlex Technologies LP | | 2014 |
| Harley & Smith Partnership | | 2009 |
| Harley Business Services L.P. | | 2008 |
| Harley Haddow Birmingham Limited | Professional & scientific | 2025 |