| Halcyon Retreat 66 Ltd | Cardiff | 2025 |
| Halcyon Retreat 67 Ltd | Cardiff | 2025 |
| Halcyon Retreat 68 Ltd | Cardiff | 2025 |
| Halcyon Retreat 7 Ltd | Cardiff | 2023 |
| Halcyon Retreat 8 Ltd | Cardiff | 2023 |
| Halcyon Retreat 9 Ltd | Cardiff | 2023 |
| Halcyon Retreat Spa Development Limited | Cardiff | 2013 |
| Halcyon Shipping Limited | London | 1971 |
| Halcyon Three Limited | London | 2020 |
| Halcyon Works Limited | Doncaster | 2026 |
| Haldenby Consulting Limited | Mirfield | 2019 |
| Haldon Forest Holiday Park Ltd | Exeter | 2019 |
| Haldon Properties Limited | London | 1986 |
| Hale FPA Consulting Limited | London | 2024 |
| Hale Securities Limited | London | 1998 |
| Hale Veterinary Group Limited | York | 2014 |
| Halearch Limited | Bridgend | 2024 |
| Halehope Ltd | Kington | 2024 |
| Halemark Limited | Bridgend | 2026 |
| Haleon UK Corporate Director Limited | Weybridge | 2021 |
| Haleon UK Corporate Secretary Limited | Weybridge | 2021 |
| Halers Lighting Limited | Northampton | 2009 |
| Hales Enterprises Limited | Ashbourne | 2012 |
| Hales Partnership Ltd | Leeds | 2011 |
| Hales Road 1961 Limited | Salisbury | 2014 |
| Halesowen Auction Rooms Limited | Halesowen | 2020 |
| Halesworth Motor Company Limited | Suffolk | 1990 |
| Halesworth Tyre and Exhaust Limited | Suffolk | 1998 |
| Haley & Weller Ltd | Derby | 2019 |
| Haley House Clinic Ltd | Bradford | 2024 |
| Half Pint Productions Ltd | Woking | 2009 |
| Halfadozen Studio Ltd | London | 2020 |
| Halfpenny Mews Management Company Ltd | Belfast | 2005 |
| Halftone Limited | Barking | 2011 |
| Halfway Holdings NO. 2 Limited | Sheffield | 2025 |
| Hali International Co., Ltd | Beckenham | 2016 |
| Hali Medica Trading Co., Ltd | Stafford | 2019 |
| Halib Foods Limited | Belfast | 2003 |
| Halifax Computer Services Limited | Boroughbridge | 2003 |
| Halifax Development 9385689 Ltd | London | 2020 |
| Halifax Financial Services Limited | West Yorkshire | 1986 |
| Halifax Garage Doors Ltd | Leeds | 2018 |
| Halifax Hall Nominees Ltd | Manchester | 2017 |
| Halifax Life Limited | West Yorkshire | 1988 |
| Halifax Pension Nominees Limited | London | 1981 |
| Halifax Vehicle Leasing (1998) Limited | West Yorkshire | 1998 |
| Halil Sevuk Ltd | Bromley | 2024 |
| Halilit Limited | Burnley | 2011 |
| Hall & HAM River Limited | Coventry | 1961 |
| Hall & Parker Ltd | Manchester | 2023 |
| Hall - Hofso Kommunikasjon Limited | Stockport | 2007 |
| Hall Aggregates (South Coast) Limited | Coventry | 1949 |
| Hall Aggregates Limited | Coventry | 1923 |
| Hall Drive Farming Company Limited | Lincoln | 2022 |
| Hall Farm Kirk Langley Management Company Limited | Derby | 2018 |
| Hall Forster and Company Limited | Tyne & Wear | 2007 |
| Hall Gardens Drive (Uppingham) Management Company Limited | Oakham | 2006 |
| Hall Green B.C. (2011) Limited | Birmingham | 2011 |
| Hall Hill Farm (Lanchester) Ltd | Lanchester | 2014 |
| Hall Leisure Limited | Skegness | 1987 |
| Hall O Coole Show Jumping Limited | Nantwich | 2016 |
| Hall Place Veterinary Centre Limited | Bristol | 2009 |
| Hall Rental Property Limited | Newcastle | 2022 |
| Hall V-Tox International Limited | Rugby | 1996 |
| Hall's (Kendal) Ltd | Windermere | 1988 |
| Hall's Garden Supplies Limited | Birmingham | 2003 |
| Hallamshire Apartments 1966 East RTM Company Limited | Sheffield | 2016 |
| Hallamshire Apartments 1966 South RTM Company Limited | Sheffield | 2016 |
| Hallamshire Heating Co. Limited | Sheffield | 2006 |
| Hallamshire Racquet Sports Trust Limited | Sheffield | 1940 |
| Hallamshire Sheet Mills Limited | Sheffield | 1997 |
| Hallberg Invest Limited | London | 2025 |
| Haller Boulevard Nominees Limited | Preston | 2007 |
| Hallett Oils Limited | Chesterfield | 2003 |
| Halley Diamond System Ltd | Uckfield | 2015 |
| Halligan Brown Ventures Ltd | Brentwood | 2025 |
| Halligan Services Limited | Bexhill-On-Sea | 2007 |
| Hallis (Preston) Limited | Lancashire | 2001 |
| Halliwell Dene Limited | Hexham | 1996 |
| Hallmark Adhesives Ltd | Waltham Abbey | 2000 |
| Hallmark Assets (Old) Ltd | Salford | 2018 |
| Hallmark Care Homes Developments Limited | Radford Way, Billericay | 2007 |
| Hallmark Commercial Limited | Harrogate | 2021 |
| Hallmark Enterprises Ltd | Newry | 2010 |
| Hallmark Healthcare (Rochdale) Limited | Billericay | 1994 |
| Hallmark Homes Limited | Chelmsford | 2018 |
| Hallmark Investor Limited | Harrogate | 2021 |
| Hallmark Real Estate Investments Ltd | Salford | 2018 |
| Hallmark Tape Printers Limited | Nottinghamshire | 2003 |
| Hallmark Trading (Europe) Ltd | Birmingham | 2024 |
| Hallmark Trading (GB) Ltd | Birmingham | 2024 |
| Hallmark Travel Limited | West Sussex | 1993 |
| Hallmark Warranties Limited | Sutton Coldfield | 2006 |
| Hallmark Workwear & Safety Limited | Canterbury | 2021 |
| Hallmark-It Limited | Edinburgh | 2011 |
| Hallmarq Systems Ltd | Guildford | 1997 |
| Hallow Developments Limited | Birmingham | 2013 |
| Halloy Limited | Brierley Hill | 2011 |
| Halls Patisserie Ltd | Cardiff | 2016 |
| Halls Products Limited | Kirkconnel | 2012 |