| Hanover Property Consultants Ltd | Salford | 2020 |
| Hanover Three Limited | Milton Keynes | 1945 |
| Hanover West (Portfolio Management) Ltd | Edgware | 2004 |
| Hanpharm Limited | Beckenham | 2020 |
| Hanpieva Ltd | Manchester | 2023 |
| Hans Consultants Limited | Chelmsford | 2005 |
| Hans Jacob Bernardus Kruger Limited | Aylesbury | 2025 |
| Hans Pflanz | London | 2024 |
| Hans Place Management Limited | London | 2021 |
| Hansa Monani Ltd | Chertsey | 2026 |
| Hansell Drew & Co Limited | Newton Abbot | 2010 |
| Hansen Consult & Sikkerhet Invest Limited | London | 2023 |
| Hansen Consult & Sikkerhet Limited | London | 2023 |
| Hansen International Co., Ltd. | Beckenham | 2014 |
| Hansesgmc Ltd | London | 2019 |
| Hansion Industrial Ltd | Beckenham | 2021 |
| Hansk Ltd | London | 2019 |
| Hanslope Care Housing Ltd | Higham Ferrers | 2022 |
| Hanson Care UK Limited | Redcar | 2019 |
| Hanson Consulting Services Ltd | Broadstairs | 2016 |
| Hanson Garages Limited | Featherstone | 2021 |
| Hanson Plumbing and Heating Limited | Oxford | 2012 |
| Hanson Steel Buildings Limited | Pontefract | 2014 |
| Hansteen Saltley Nominee NO.1 Limited | London | 2014 |
| Hansteen Saltley Nominee NO.2 Limited | London | 2014 |
| Hanus Holding Ltd | London | 2014 |
| Hanwell Fields 3B Management Company Limited | High Wycombe | 2005 |
| Hanwood Limited | Huddersfield | 1986 |
| Hanyu Industry Co., Ltd | Beckenham | 2022 |
| Hanz Europe Ltd | London | 2023 |
| Hanz Industry Co., Ltd | Beckenham | 2016 |
| Hanzi Industrial Shanghai Co., Ltd | Stafford | 2011 |
| Hanzi Yachting Ltd | London | 2025 |
| Hanzo Group Limited | London | 2020 |
| HAO Ming Electronic Commerce Co., Ltd | Hertford | 2021 |
| Haoheng Machinery Equipment Co., Ltd | Beckenham | 2020 |
| Haoltk Limited | Sheffield | 2021 |
| Haoran Machinery Co., Ltd. | Beckenham | 2013 |
| Haosteel Group Co., Limited | London | 2016 |
| Haotai Trading Co., Ltd | Beckenham | 2018 |
| Haotian Cleaning Equipment Technology Co., Ltd. | Beckenham | 2012 |
| Haotian International Trade Co., Limited | Beckenham | 2013 |
| Haotong International Trading Co., Ltd | Beckenham | 2010 |
| Haotoo Industry Co., Ltd | Cambridge | 2020 |
| Haowang International Holdings Limited | Cambridge | 2015 |
| Haoyang International Trade Co., Ltd | Ruislip | 2024 |
| Haozhi Trading Co., Ltd | Stafford | 2022 |
| Hapeace Holdings Ltd. | Ilford | 2016 |
| Happen Fostercare Limited | Bolton | 2000 |
| Happen Holdings Limited | Bolton | 2006 |
| Happicabs Stansted Limited | Hornchurch | 2016 |
| Happier Hospitality Ltd | London | 2024 |
| Happinace Ltd | Shipley | 2022 |
| Happtiness - the Psychology of Exercise Ltd | Birmingham | 2023 |
| Happy Academy Limited | Rochford | 2014 |
| Happy Break Holidays Ltd | Hove | 2015 |
| Happy Buddies Ltd | Tadworth | 2024 |
| Happy Bunnies Limited | St. Neots | 2000 |
| Happy Caterpillar Limited | London | 2015 |
| Happy Energy Services Limited | Doncaster | 2025 |
| Happy Ever After Ltd | Plymouth | 2023 |
| Happy Fish Ltd | Mablethorpe | 2022 |
| Happy Halloween Limited | Southport | 2014 |
| Happy Harbor Innovations Ltd | Doncaster | 2026 |
| Happy Henry's! Ltd | Stafford | 2021 |
| Happy Hermit Home Ltd | Dunstable | 2024 |
| Happy Home 108 Ltd | Manchester | 2022 |
| Happy Home Furnishers Limited | Cross Hands Llanelli | 1994 |
| Happy Home Lettings Limited | Witney | 2023 |
| Happy Horse Land Ltd. | Manchester | 2026 |
| Happy Hub Consulting Limited | Nottingham | 2021 |
| Happy IA Ltd | Sutton | 2024 |
| Happy Keslie Garment Co., Ltd. | Cardiff | 2018 |
| Happy Land Adventures Ltd | Newton Aycliffe | 2023 |
| Happy Marine Electronic Service Co., Ltd | Beckenham | 2016 |
| Happy on the Inside Design Ltd | Belfast | 2023 |
| Happy Pastures Ltd | London | 2023 |
| Happy Paws Dog Walking & Pet Care Ltd | King'S Lynn | 2022 |
| Happy Pets Chichester Ltd | Chichester | 2014 |
| Happy Samosa Ltd | London | 2020 |
| Happy Time Sweden Limited | London | 2022 |
| Happy Time to Ltd | Manchester | 2025 |
| Happy Yachting Ltd | Blackpool | 2024 |
| Happy Yarn Crochet Limited | London | 2025 |
| Happyhood Ltd | New Romney | 2024 |
| Happyhourwithk Ltd | Pinner | 2021 |
| Happyhouseliving Ltd | Haverfordwest | 2024 |
| Happypick Ltd | Kington | 2024 |
| Happysolutionz Ltd | Peterborough | 2022 |
| Happyvision Ltd | London | 2021 |
| Happywifi Ltd | London | 2003 |
| Hapus Holidays Limited | Swansea | 2017 |
| Hapus Management Limited | Swansea | 2017 |
| Hapusmor Ltd | Aberystwyth | 2024 |
| Haque Commercial Solutions Limited | Leeds | 2015 |
| Haque Technical Ltd | Slough | 2015 |
| HAR Naturel Limited | Bromley | 2021 |
| HAR Shield Coin Ltd | London | 2021 |
| Haras Investments Limited | Bishop'S Stortford | 1933 |
| Harbay Properties Limited | Surrey | 1949 |