| Harbechark Management Ltd | London | 2018 |
| Harbello Ltd | Ilkley | 2022 |
| Harber Stone Limited | Bournemouth | 1987 |
| Harbinson Mews Limited | Ballyclare | 2001 |
| Harbison Goods Ltd | Chorley | 2024 |
| Harbledown Limited | South Croydon | 2013 |
| Harbor Crest Investment Firm Ltd | Manchester | 2026 |
| Harbor Provisions Ltd | Cardiff | 2011 |
| Harbora Properties Limited | Basildon | 1998 |
| Harboran Limited | Maidenhead | 1994 |
| Harborcrest Solutions Ltd | Doncaster | 2026 |
| Harborne Estates Limited | Cannock | 2012 |
| Harborview Media Ltd | Manchester | 2025 |
| Harbour & Hive Goods Ltd | Doncaster | 2026 |
| Harbour 1957 Limited | St. Austell | 2014 |
| Harbour Court Apartments Management Company Limited | Donaghadee | 1989 |
| Harbour Energy Developments Limited | London | 1996 |
| Harbour Energy Production Limited | London | 2023 |
| Harbour Energy Secretaries Limited | London | 2019 |
| Harbour Holidays (Rock) Limited | Newmarket | 2018 |
| Harbour House (Shoreham) Management Limited | Shoreham-By-Sea | 1999 |
| Harbour House Holidays Limited | Plymouth | 2009 |
| Harbour Housing Facilities Management Ltd | St Austell | 2023 |
| Harbour Housing Group Ltd | St Austell | 2023 |
| Harbour Housing Ltd | St Austell | 2024 |
| Harbour Housing Management Ltd | St Austell | 2023 |
| Harbour Housing Supported Living Ltd | St Austell | 2023 |
| Harbour Industry Limited | London | 2016 |
| Harbour Living Solutions Ltd | Stevenage | 2014 |
| Harbour Loft Management Company Limited | Belfast | 2009 |
| Harbour Mews (Seaton) Management Company Limited | Seaton | 2003 |
| Harbour Point Management Co (Participants) Ltd | Canterbury | 2015 |
| Harbour Point Management Co. Limited | Canterbury | 1990 |
| Harbour Tavern Mevagissey Ltd | Langport | 2025 |
| Harbour View Flats Maryport Limited | Maryport | 2013 |
| Harbour Walk 2005 Management Company Limited | Bourne End | 2005 |
| Harbourland 1956 Limited | Gainsborough | 2014 |
| Harbourstone Consulting Ltd | Doncaster | 2026 |
| Harbury Fields (Bush Heath Lane) Management Company Limited | Great Alne | 2010 |
| Harby Investments Limited | Rushden | 2011 |
| Harcham Ltd | Buckingham | 2023 |
| Harcourt Developments & Investments (UK) Limited | Borehamwood | 2007 |
| Harcourt Hotels (UK) Limited | Worthing | 1997 |
| Harcourt Registrars Limited | Richmond | 1984 |
| Harcourtbrook Ltd | Thetford | 2022 |
| Harcroft Estates Limited | Leeds | 2006 |
| Hard 6 Restaurants Limited | Northampton | 2007 |
| Hard 8 Marketing Limited | London | 2010 |
| Hard and Fast Ltd | Harrogate | 2012 |
| Hard HAT Cleaning Limited | Merseyside | 2007 |
| Hard Metal Roofing Company Limited | Ottershaw | 2008 |
| Hard to Find Cars Limited | Birmingham | 2001 |
| Hard to Find Coins Limited | Birmingham | 2011 |
| Hard to Find Retail Limited | Birmingham | 2010 |
| Hard to Find Whiskey Limited | Birmingham | 2011 |
| Hardacres Funeral Directors Limited | Sutton Coldfield | 1994 |
| Hardalac Seas Ltd | Cardiff | 2025 |
| Hardcore Integrated Services Limited | Milton Keynes | 1997 |
| Hardcore Ltd | Harrogate | 2012 |
| Hardeley Limited | Coventry | 2025 |
| Hardforce Limited | Nottingham | 2016 |
| Harding Consolidated Property Holdings Limited | Hampshire | 1997 |
| Harding Estates (Chimney) Limited | Stroud | 2011 |
| Harding Homes Limited | Chelmsford | 2023 |
| Hardinge Place Management Limited | Toddington | 2013 |
| Hardman Electrical Contractors Ltd | Skelmersdale | 2026 |
| Hardman Street 1973 Limited | Oldham | 2015 |
| Hardmann Services Limited | Bury | 2021 |
| Hardmash Limited | Alderley Edge, Cheshire | 2025 |
| Hardroad Holdings Limited | Altrincham | 2017 |
| Hardrock Limited | Bolton | 1935 |
| Hardsarts Limited | London | 2010 |
| Hardshelfco 132 Limited | Dukinfield | 2002 |
| Hardsoft Computers Limited | Old Harlow | 2006 |
| Hardtwell Limited | Wellingborough | 2024 |
| Hardware Depot Limited | 3 Dorset Rise | 2013 |
| Hardwick & Co Consulting Ltd | Macclesfield | 2024 |
| Hardwick Nominees Limited | Derbyshire | 1994 |
| Hardwick Properties Limited | Redhill | 2012 |
| Hardwick Supplies Limited | London | 2020 |
| Hardwicks Limited | Rotherham | 2003 |
| Hardy & Co. (Bridlington) Limited | Bridlington | 1959 |
| Hardy 1962 Ltd | Bournemouth | 2016 |
| Hardy Advanced Composites Limited | Cramlington | 2011 |
| Hardy Consulting Group Ltd | Chichester | 2025 |
| Hardy Geoscience Ltd | Bristol | 2023 |
| Hardy House Limited | Ashford | 2006 |
| Hardy Investment Management Ltd | Coventry | 2015 |
| Hardys (Canterbury) Limited | Canterbury | 2012 |
| Hardys (Salisbury) Limited | London | 2016 |
| Hare Capital Management Limited | London | 2018 |
| Hare of the Duck Ltd | Leyland | 2017 |
| Hare Street House Ltd | London | 2019 |
| Harebrain Ltd | Guisborough | 2021 |
| Harecastle Mews Limited | Stoke-On-Trent | 2010 |
| Haredata Electronics Limited | Knaresborough | 1994 |
| Haredon Developments Limited | Sheffield | 1963 |
| Harefield Property Services Limited | Deal | 2014 |
| Harelands (Melsonby) Limited | Richmond | 2012 |
| Harelands Courtyard 16 Limited | Richmond | 2015 |