| H1 Healthcare Solutions Ltd | Glasgow | A rating |
| H1 Life Sciences Limited | Altrincham | A rating |
| H10 Hotels Waterloo Ltd | London | A rating |
| H2 BEAUTY CO LTD | Birmingham | A rating |
| H2 Design Limited | London | A rating |
| H2A Online Ltd | Birmingham | A rating |
| H2C Gelati Ltd (Amorino) | London | A rating |
| H2H SAVE-MORE LIMITED | Denham | A rating |
| H2H Yachts & Jets LTD | London | A rating |
| H2I consultancy ltd | Slough | A rating |
| H2I HOMES LTD | Slough | A rating |
| H2M ENGINEERING LTD | Hinckley | A rating |
| H2Nutrition Ltd | London | A rating |
| H2O AM LLP | London | A rating |
| H2o IT Ltd | Edgware | A rating |
| H2O Logistics Limited | Bristol | A rating |
| H2O Vape Limited | Birmingham | A rating |
| H3 ENTERPRISES LIMITED | Birkenhead | A rating |
| H3 Group Ltd | Swansea | A rating |
| H3F Limited | Paisley | A rating |
| H3O Digital Ltd | London | A rating |
| H3O Group Limited | Northampton | A rating |
| H4 Aerospace (UK) Ltd | Hemel Hempstead | A rating |
| H4B London Limited | London | A rating |
| HA (BRADFORD) LTD | Bradford | A rating |
| HA APPAREL LTD | Manchester | A rating |
| HA Convenience LTD | Birmingham | A rating |
| HA COURIERS LTD | London | A rating |
| HA DYANAMIC PROPERTY LTD T/A P2P CLEANING | Leicester | A rating |
| HA DYNAMIC PROPERTY LTD | Leicester | A rating |
| HA FINANCE LIMITED | BOLTON | A rating |
| HA JEEM LTD. | Romford | A rating |
| HA McParland Ltd. | Slough | A rating |
| HA TRANSPORT SERVICES LTD | Birmingham | A rating |
| HA WINDOWS AND DOORS LTD | Luton | A rating |
| HAADI TRADERS LTD | Manchester | A rating |
| Haag Streit UK | Bishops Stortford | A rating |
| HAAGINTERIORS LIMITED | LONDON | A rating |
| Haana Tech LTD | London | A rating |
| Haandi Ltd | Bridlington | A rating |
| Haaris Abdullamia Kadri T/A Cedars Dental Practice | Preston | A rating |
| HAARIS PROPERTIES LTD | Birmingham | A rating |
| HAAS AUTOMATION LIMITED | NORWICH | A rating |
| Haas Formula UK Limited | Banbury | A rating |
| Haavi Innovations Limited T/A Haavi Innovations | Brentford | A rating |
| HAB TV LTD | London | A rating |
| Hababy Health Trading Ltd | London | A rating |
| Habaneros Trading Ltd | London | A rating |
| Habasit UK Ltd | Elland | A rating |
| Habbineal's Ltd T/A Habbineal's Convenience | Leamington Spa | A rating |
| Haberdashers Aske's Federation | London | A rating |
| Haberdashers' Adams | Newport | A rating |
| Haberdashers' Elstree Schools | Elstree | A rating |
| Haberdashers' Knights Academy | Bromley | A rating |
| HABERDASHERY & FABRICS LTD | Brighton | A rating |
| Haberdasherylondon ltd. | London | A rating |
| HABIB & SALEEM GROUP LIMITED | LEEDS | A rating |
| HABIB BANK AG ZURICH | LONDON | A rating |
| Habiba Foods LTD | Basildon | A rating |
| HABIBI CONSTRUCTIONS LTD | Manchester | A rating |
| HABIBS ENTERPRISE LTD. T/A: MUNCHIES | AYLESBURY | A rating |
| HABIBUR RAHMAN FRESH FRUITS & VEGETABLES LTD | London | A rating |
| Habitas Hospitality Limited | London | A rating |
| Habitat Energy | Oxford | A rating |
| Habitat for Humanity Ireland | Lisburn | A rating |
| Habitat Learn Limited | Woking | A rating |
| Habitat Nationwide Ltd | London | A rating |
| Habitat Support services LTD | FAREHAM | A rating |
| Habitation Care Ltd | Brighton | A rating |
| HABITATUK LIMITED | London | A rating |
| Habton Racing | Great Habton | A rating |
| Hach Lange Ltd | Salford | A rating |
| HACHETTE PARTWORKS LIMITED | London | A rating |
| Hachette UK (Holdings) Limited | London | A rating |
| Hachi Notting Hill Ltd | London | A rating |
| HACIEN BARBERSHOP LTD | Hayes | A rating |
| Hack Partners Limited | Devizes | A rating |
| Hack the Box | London | A rating |
| HACKAJOB LTD | London | A rating |
| Hackbridge News and Post Office | Wallington | A rating |
| HACKER ACADEMY LTD | London | A rating |
| HackerOne B.V. | London | A rating |
| HackerRank UK Limited | London | A rating |
| Hackett Limited | London | A rating |
| Hackney Building Supplies Ltd | London | A rating |
| Hackney Chiropractic Limited | London | A rating |
| HACKNEY COMMUNICATION LIMITED | London | A rating |
| Hackney Dental Practice Ltd | LONDON | A rating |
| Hackney Education | London | A rating |
| Hackney Gelato Limited | London | A rating |
| Hackney Meat Traders Ltd | Dagenham | A rating |
| Hackon Services Ltd | Horsham | A rating |
| Hackstons Limited | London | A rating |
| Haco Group Co. Ltd | London | A rating |
| Had Me At Hello Ltd | Hertford | A rating |
| HADAM GROUP LTD T/A HADAM STRATEGY | London | A rating |
| Haddington Care Limited | Edinburgh | A rating |
| Haddington Farms | Gordon | A rating |
| Haddington Retail Unit Ltd t/a Shop Smart | Haddington | A rating |
| HADDLETON & CO LIMITED | Harrogate | A rating |
| HADDON COURT LIMITED | BLACKPOOL | A rating |
| Haddonstone Limited | Northampton | A rating |
| HADE EUROPEAN SITE SERVICES LTD | Newark | A rating |
| Hadean Supercomputing Ltd | London | A rating |
| HADEED BRODICK LIMITED | Kirkcaldy | A rating |
| HADEED LTD | EDINBURGH | A rating |
| Haden Vale Medical Practice | Cradley Heath | A rating |
| Haden Vale Pharmacy | Cradley Heath | A rating |
| HADES PLUMBING LTD | Morden | A rating |
| Hadet Healthcare | Cannock | A rating |
| HADET HEALTHCARE | Cannock, | A rating |
| Hadfelda Convenience Store | Chelmsford | A rating |
| Hadfield Cawkwell Davidson Limited | Sheffield | A rating |
| Hadfield st Andrews Cricket Club | Glossop | A rating |
| Hadi & Co Limited | Glasgow | A rating |
| Hadi Care Ltd | Leeds | A rating |
| Hadi Cash & Carry Ltd | Southampton | A rating |
| Hadi International Limited | Colne | A rating |
| HADI TECHNICAL LTD | WARRINGTON | A rating |
| Hadi Travel Ltd T/As Hadi Cars | London | A rating |
| Hadiyah Limited t/a Hadiyah | London | A rating |
| Hadleigh and Thundersley Cricket Club | Benfleet | A rating |
| Hadleigh Cricket Club | Hadleigh | A rating |
| Hadleigh Dental and Cosmetics Centre | Hadleigh | A rating |
| Hadley Care Limited | Roundswell | A rating |
| Hadley Dental Practice | Telford | A rating |
| Hadley group | Smethwick | A rating |
| Hadlow Rural Community School | Tonbridge | A rating |
| Hado Catering Promotion Limited t/a Hanawata London | London | A rating |
| Hado Pharmacy T/A Hado UK Ltd | Felixstowe | A rating |
| Hadrian Health Centre | Wallsend | A rating |
| Hadrian Healthcare Limited | Gateshead | A rating |
| Hadrian Security Limited | London | A rating |
| Hadron International Ltd | London | A rating |
| HADSON RETAIL LIMITED T/A UKEUMANUFACTURING | PERIVALE | A rating |
| HADSUP LIMITED | Slough | A rating |
| Hadwen Health (also known as Hadwen Medical Practice) | Gloucester | A rating |
| HADY BUILDERS LTD | Nottingham | A rating |
| Haeco Global Engine Support | London, Heathrow | A rating |
| Haefele Software Limited | London | A rating |
| Haefele Software Ltd | London | A rating |
| Haelan Centre Limited | London | A rating |
| Haemonetics Limited | Glasgow | A rating |
| Haer-2-Care LTD T/A SureCare North Herts & Stevenage | Stevenage | A rating |
| Haes Technologies Ltd | West Drayton | A rating |
| Hafele U.K. Limited | Rugby | A rating |
| HAFEZ RESTAURANT LIMITED | London, | A rating |
| HAFI COMPANY LIMITED | Manchester | A rating |
| Hafiz Halal Meat & Groceries Limited | Watord, | A rating |
| HAFIZ MIRZA LTD | London | A rating |
| HAFIZ MUSTAFA 1864 LONDON LTD | London | A rating |
| Haflo Ltd | London | A rating |
| Hafod Care Organisation Ltd | Sutton Coldfield | A rating |
| Hafod Housing Association Limited | Cardiff | A rating |
| Hafod Y Green Rehabilitation and Nursing Centre | Denbigh | A rating |
| Hafren Scientific Ltd | Welshpool | A rating |
| Hafren Veterinary Group Limited | Newtown | A rating |
| Hafren Water Limited | Harden | A rating |
| HAFS ACADEMY TRUST | LONDON | A rating |
| HAGAN FISH BAR & CAFE LTD | CARMARTHEN | A rating |
| Hager Engineering Limited | Telford | A rating |
| Hagerty International Limited | Towcester | A rating |
| HAGGERSTON MINIMART LTD | Merseyside | A rating |
| Haggie Partners | London | A rating |
| HAGINAKALA PARARAJASINGAM T/A WAINSCOTT STORES AND NEWSAGENTS | ROCHESTER | A rating |
| Hagley Motors Ltd | BIRMINGHAM | A rating |
| HAH Hospitality Limited t/a Indian Affair Ancoats | Manchester | A rating |
| HAHM LTD | High Wycombe | A rating |
| HAHN Automation Ltd | Tyne & Wear | A rating |
| HAHNBECK BUSINESS SYSTEMS LTD | London | A rating |
| HAI BOX W12 LTD | RICHMOND | A rating |
| Hai Robotics U.K. Limited | Northampton | A rating |
| HAICHENG BUSINESS LTD | London | A rating |
| Haider & Haider Securities Limited | London | A rating |
| Haider Fashion | Oldham | A rating |
| HAIDER GROCERS LIMITED | Heckmondwike | A rating |
| Haiduk's Padel Company Ltd | Bordon | A rating |
| HAIER HVAC SOLUTIONS UK LTD | Warrington | A rating |
| Haier Smart Home UK&I Ltd | Warrington | A rating |
| Haighfield Care Home | Wigan | A rating |
| Haigs Hotel ,and Mckees Brasserie | Balsall Common | A rating |
| Haiilo Ltd | London | A rating |
| Haileybury College | Hertford | A rating |
| Haileybury Turnford | Cheshunt | A rating |
| Hailsham Medical Group | Hailsham | A rating |
| HAILSHAM ROADWAY CONSTRUCTION CO LTD | Hailsham | A rating |
| Haimer UK Ltd | Burnley | A rating |
| HAINAN AIRLINES HOLDING (UK) CO. LIMITED | London | A rating |
| HAINAULT COSTCUTTER | ESSEX | A rating |
| Haines Gadd Greaves Ltd | Chipping Norton | A rating |
| Haines Watts Farnborough LLP | Slough | A rating |
| Haines Watts Kingston LLP | Esher | A rating |
| Haines Watts Swindon (Services) Limited | Swindon | A rating |
| Haiper Limited | London | A rating |
| HAIR & BEAUTY CLIPPERS LTD | MIDDELSEX | A rating |
| HAIR & COSMATIC LTD | Thornton Heath | A rating |
| Hair & skin clinic ltd | Birmingham | A rating |
| Hair and Beauty Palace Ventures Limited | Bracknell | A rating |
| Hair and Beauty Poetry Ltd | Wokingham | A rating |
| Hair by Floria | London | A rating |