| Hawk Security & Services Ltd | Ilford | 2008 |
| Hawk Spring Water Limited | Cranbrook | 2024 |
| Hawk Steelwork Ltd | Preston | 2019 |
| Hawk Way Management Co Ltd | Bury St. Edmunds | 2005 |
| Hawkcentral Limited | Swindon | 1988 |
| Hawkdove Ltd | London | 2001 |
| Hawker Holdings Ltd | London | 2016 |
| Hawker Siddeley Aviation Limited | Camberley | 1917 |
| Hawker Siddeley Dynamics Limited | Camberley | 1978 |
| Hawkes Aviation Limited | Wimborne | 2021 |
| Hawkes International Ltd | Waltham Cross | 2023 |
| Hawkes Power Co., Ltd | Stafford | 2020 |
| Hawkeye Security Solutions Ltd | West Bromwich | 2012 |
| Hawkhurst Lavender Limited | Cranbrook | 2022 |
| Hawkins Construction Limited | Taunton | 2014 |
| Hawkins Property Investments Limited | Gillingham | 2016 |
| Hawkins Recruitment Limited | Blackburn | 2019 |
| Hawkland Architects Ltd | Bristol | 2025 |
| Hawkland Construction Ltd | Bristol | 2025 |
| Hawkmead Ltd | Tilbury | 2012 |
| Hawks & Partners Limited | Ascot | 2023 |
| Hawksbatch Investment Company | Tunbridge Wells | 2020 |
| Hawksdale Limited | Carlisle | 1997 |
| Hawksmead Limited | Peterborough | 2002 |
| Hawksmoor Fund Managers Limited | Exeter | 2016 |
| Hawkstone Design EOT Limited | Gloucester | 2024 |
| Hawksworth 1966 Limited | Tamworth | 2014 |
| Hawkwood Limited | Shipley | 2007 |
| Hawley & Partners Limited | York | 2000 |
| Hawley & Wood Limited | Chorley | 2003 |
| Hawleys (Tyre Services) Limited | Hampshire | 1961 |
| Hawn Store Limited | Nottingham | 2025 |
| Hawne Basin Social Club Limited | Stourbridge | 2018 |
| Haworth & Co Probate Services Limited | Norwich | 2019 |
| Haworth Machining Limited | Devon | 1960 |
| Haworth Tompkins Trustees Limited | London | 2019 |
| Haworths Limited | Burnley | 2004 |
| Hawskercourt Limited | Leeds | 1973 |
| Hawthorn Avenue (Gillingham) Management Limited | Gillingham | 2009 |
| Hawthorn Events Ltd | Leicester | 2023 |
| Hawthorn Financial Services Ltd | Glasgow | 2024 |
| Hawthorn Hall Management Ltd | Ballyclare | 2016 |
| Hawthorn Investments Limited | Gwaelod Y Garth | 2007 |
| Hawthorn Learning Tree Ltd | London | 2020 |
| Hawthorn Meadows Management Limited | Ross-On-Wye | 2000 |
| Hawthorn RTM Company Limited | Bushey | 2026 |
| Hawthornden Lodge Limited | Belfast | 1984 |
| Hawthorne and Beechwood Management Company Ltd | Bangor | 2021 |
| Hawthorne Grove Limited | London | 2023 |
| Hawthorne Mews Management Company Ltd | Iver | 2014 |
| Haxby Developments Ltd | Retford | 2021 |
| Haxden Properties Limited | Manchester | 1964 |
| HAY Feeders UK Ltd | Carlisle | 2026 |
| HAY Fisher Limited | Oldbury | 2016 |
| HAY Warren Limited | Hereford | 2013 |
| Hay's Elite Events Ltd | London | 2024 |
| HAY2 Ltd | Blackburn | 2021 |
| Hayalim Ltd | London | 2026 |
| Hayashi IMP and EXP Co., Ltd | London | 2025 |
| Hayat Apartments Limited | Birmingham | 2024 |
| Hayat Ecom Ltd | London | 2022 |
| Hayati Yachting Ltd | London | 2025 |
| Hayatt Properties Ltd | Luton | 2021 |
| Haybeech Limited | Coventry | 2011 |
| Haybridge Park Limited | Warminster | 2014 |
| Haych Properties Ltd | Grimsby | 2025 |
| Haychex Limited | Halifax | 2021 |
| Haydale Graphene Industries Limited | Ammanford | 2015 |
| Haydee Limited | Blackpool | 2026 |
| Haydex Limited | Dunstable | 2013 |
| Haydock Park Leisure Company Limited | | 1981 |
| Hayers Property Limited | Weston-Super-Mare | 2012 |
| Hayes Environmental Ltd | Haslemere | 2010 |
| Hayes Forensics Limited | Macclesfield | 2022 |
| Hayes Road 1961 Limited | Stroud | 2014 |
| Hayfever Ltd | Woking | 2012 |
| Hayfield Solution Ltd | Wick | 2013 |
| Haygreen Cars Limited | Maidstone | 2025 |
| Hayles and Howe Consulting Limited | Thornbury | 2014 |
| Hayleyellenjames Ltd | High Wycombe | 2024 |
| Hayleyjamescreations Ltd | Sutton-In-Ashfield | 2025 |
| Hayling Billy Management Limited | Hayling Island | 1994 |
| Hayling Spice Ltd | Southsea | 2017 |
| Hayloft House Ltd | Torpoint | 2024 |
| Hayloft Mews Management Company Limited | Brighton | 2014 |
| Hayman Group Ltd | Witham | 2021 |
| Haymarket 1959 Limited | Livingston | 2014 |
| Haymoors (Somerset) Limited | Langport | 1987 |
| Haymort Trading Limited | Upavon | 2019 |
| Haynes Furnishers Limited | Burton-On-Trent | 2011 |
| Hayre Construction London Limited | Slough | 2025 |
| Hayre Corporation Limited | Hounslow | 2025 |
| Hayre Group Limited | Slough | 2025 |
| Hayris Events Ltd | Maidstone | 2022 |
| Hays Nominees Limited | London | 1968 |
| Hays Pension Trustee Limited | London | 1996 |
| Hays Stakeholder Life Assurance Trustee Limited | London | 1989 |
| Haysen Harbour Hounds Ltd | Donaghadee | 2024 |
| Hayshine (Newco) Limited | Bexley | 2016 |
| Haystacklabs Ltd | London | 2014 |