| Harrogate Secure Shredding Ltd | Bristol | 2013 |
| Harrogate Securities Limited | Harrogate | 2026 |
| Harrogate Self Storage Solutions Ltd | Bristol | 2019 |
| Harrogate Self Store Ltd | Bristol | 2009 |
| Harrogate Storage Supplies Ltd | Bristol | 2019 |
| Harrold Financial Planning Holdings Limited | Hove | 2007 |
| Harrold Jones Services Limited | Birmingham | 2009 |
| Harron 1964 Limited | Liverpool | 2014 |
| Harron Homes (Midlands) Limited | Leeds | 2004 |
| Harron Homes (North West) Limited | Leeds | 2002 |
| Harroquip Pump Systems Limited | Hull | 2014 |
| Harrow Road Limited | London | 2010 |
| Harrowby Close Pemberton Limited | Wigan | 2008 |
| Harrowby Estates (Trustees) Limited | Sandon | 2010 |
| Harrowby House Management Company Limited | Portsmouth | 1984 |
| Harrowcourt Limited | London | 1983 |
| Harry Adcock Limited | Leeds | 2015 |
| Harry Andrew Hargreaves Limited | Norwich | 2025 |
| Harry Andrew Munro Limited | Norwich | 2025 |
| Harry Bear Limited | Swansea | 2021 |
| Harry Callan Limited | Knutsford | 2011 |
| Harry Edwards & Sons Funeral Directors (Wellington) Limited | Telford | 2014 |
| Harry Edwin Site Services Ltd | Morpeth | 2024 |
| Harry Ferguson Limited | Freshwater | 1955 |
| Harry Huggins Ltd | London | 2024 |
| Harry Jack Sports Ltd | Manchester | 2011 |
| Harry Porter Ltd | Ross-On-Wye | 2013 |
| Harry Russell Limited | Reading | 1958 |
| Harry Shaw Holidays Limited | Coventry | 1982 |
| Harry Taylor of Bromley Limited | Bromley | 1975 |
| Harry Wilkinson Limited | Bishop Auckland | 2016 |
| Harry Williams & Sons (Cambridge) Limited | Sutton Coldfield | 1963 |
| Harry's Halal Ltd | Gerrards Cross | 2021 |
| Harryburn Wind Farm Limited | Swindon | 2016 |
| Harrycat Ltd | Edinburgh | 2012 |
| Harrys Grill Sweden Limited | London | 2021 |
| Harrys Haulage Limited | London | 2022 |
| Harrys Holding Sweden Limited | London | 2021 |
| Harryt Ltd | Bromley | 2017 |
| Harsco Metals Holdings Limited | London | 1956 |
| Harstudio Hamar Frisor Invest Limited | London | 2025 |
| Hart Aggregates Limited | Derby | 1972 |
| Hart Hardware Limited | Halesowen | 2010 |
| Hart Shaw Business Services Limited | Sheffield | 2010 |
| Hart Webb Limited | Altrincham | 2014 |
| Hart, Fenton & Co Limited | London | 2006 |
| Hart, Moss, Copley & Co. Limited | Park Sheffield | 1991 |
| Hartage Limited | Bury | 2020 |
| Hartburn Village Management Limited | Stockton-On-Tees | 2009 |
| Harte Electrical Limited | Ossett | 1985 |
| Harte Group Limited | Ossett | 2025 |
| Harte Manufacturing Limited | Ossett | 2025 |
| Hartebeest Consulting Ltd | Belfast | 2015 |
| Hartfield Group Limited | Hailsham | 2016 |
| Hartfield Homes (Easter Inch) Limited | Damhead | 2001 |
| Hartfield Road Limited | New Malden | 2014 |
| Hartford IT Services Limited | Gloucester | 2013 |
| Hartham Bath Stone Limited | Cheltenham | 2014 |
| Hartigan Properties Limited | Reading | 2016 |
| Hartland Harrow Limited | Carlisle | 2015 |
| Hartland Shipping Employee Trustee Limited | London | 2021 |
| Hartley Antiques Limited | Slaithwaite | 1994 |
| Hartley ARB Ltd | Trowbridge | 2024 |
| Hartley Asset Management Ltd | Coventry | 2017 |
| Hartley Environmental Trust Limited | Slaithwaite | 2009 |
| Hartley Industrial Trust Limited | Slaithwaite | 1983 |
| Hartley Quality Residential Developments ( NO. 1) Limited | Huddersfield | 2007 |
| Hartley Sinclair Limited | Harrogate | 2012 |
| Hartley-Scott Homes Limited | Neston | 2018 |
| Hartleys (Ulverston) Limited | Cheshire | 1918 |
| Hartleys Enterprises Limited | Bridport | 2022 |
| Hartserver Ltd | Leeds | 2018 |
| Hartshead Honey Ltd | Ashton-Under-Lyne | 2025 |
| Hartshill Pharmacy Limited | Chester | 1997 |
| Hartson Hotels Limited | Cheshire | 2004 |
| Hartswood Flooring Limited | Shenfield | 2003 |
| Hartwells Developments Limited | Wootton | 1984 |
| Hartwood Ltd | Matlock | 2022 |
| Harty Reads Ltd | Hook | 2023 |
| Harun Greenwood Ltd | Mildenhall | 2023 |
| Harun Owen Frank Greenwood Ltd | Mildenhall | 2023 |
| Harvard Developments Limited | Rugeley | 2000 |
| Harvard Road 38 Limited | | 2004 |
| Harver Enterprises Limited | Cornwall | 2006 |
| Harver Packaging Co. Limited | Enfield | 1970 |
| Harverine Limited | Canterbury | 2006 |
| Harvest Agro Co., Ltd | London | 2025 |
| Harvest Aluminium Co., Ltd | Cambridge | 2013 |
| Harvest Energy Marine Limited | Thurgarton | 2019 |
| Harvest Gold Limited | Glasgow | 2012 |
| Harvest International Industrial Co., Ltd. | Beckenham | 2024 |
| Harvest Moon Trading Partners Ltd | Manchester | 2026 |
| Harvest Nominees Ltd | Salford | 2003 |
| Harvest Productions Ltd | Norwich | 2023 |
| Harvest Retail (Holdings) Limited | London | 2020 |
| Harvest Sloane & Nightingale Global Limited | London | 2015 |
| Harvest Systems Limited | Banbury | 2024 |
| Harvest Top Industrial Limited | London | 2015 |
| Harveve (Holdings) Limited | Blackburn | 2015 |
| Harvey & Rybak Limited | Bangor | 2018 |