| DUNLIN CARE LTD | Reading | A rating |
| Dunlop Aircraft Tyres Limited | Birmingham | A rating |
| Dunlop Golf Europe Ltd | Aldershot | A rating |
| Dunlop International Europe Limited | Leatherhead | A rating |
| Dunlop Oil & Marine Ltd | Grimsby | A rating |
| Dunluce Healthcare Bangor Ltd | Holywood | A rating |
| Dunluce Healthcare Lisnaskea Ltd | Lisnaskea | A rating |
| Dunluce Pharmacy Ltd | Belfast | A rating |
| Dunmanifestin Ltd | Broad Chalke, Salisbury | A rating |
| Dunmore Pharma Ltd t/a Dunmore Pharmacy | Belfast | A rating |
| Dunmuir Veterinary Group | Castle Douglas | A rating |
| Dunn Bros Recycling Ltd | Smethwick | A rating |
| Dunne Livestock limited | OMAGH | A rating |
| dunnhumby Limited | London | A rating |
| Dunnington Cricket Club | York | A rating |
| Dunnis Limited | Milton Keynes | A rating |
| Dunniwood Lodge (Doncaster) Limited | Doncaster | A rating |
| Dunns Artsian Bakers Ltd | London | A rating |
| Dunoon Hotels ltd | LLandudno | A rating |
| Dunorlan Park Store Ltd | Tunbridge Wells | A rating |
| dunphy combustion ltd | ROCHDALE | A rating |
| Dunraven Educational Trust | London | A rating |
| Duns Dental Care | Duns | A rating |
| Dunscrest Limited | London | A rating |
| Dunsland House Limited | Berkhamsted | A rating |
| Dunstable Flooring & Kitchens Ltd | Dunstable | A rating |
| DUNSTABLE LEARNING CENTRE LTD | Dunstable | A rating |
| DUNSTABLE ROAD BAKES LIMITED T/A CAKES & BAKES LUTON | Bedfordshire | A rating |
| Dunstall Cricket Club | Burton-upon-Trent | A rating |
| Dunstan Village Group Practice | Liverpool | A rating |
| Dunster and Porlock Surgeries | Minehead | A rating |
| DUNSTON SERVICES LTD | Newcastle Upon Tyne, | A rating |
| Dunthorne Parker Architects Limited | London | A rating |
| Dunton Environmental Limited | Walsall | A rating |
| Dunville Health Centre | Belfast | A rating |
| Dunwood Manor Romsey Limited | Edgware | A rating |
| Dunwoody LLP | Stanmore | A rating |
| Dunya Restaurants Ltd | Plymouth | A rating |
| Duo Model Mgmt | London | A rating |
| Duo Operations Ltd | Exeter | A rating |
| DUO SAFETY LIMITED | Liverpool | A rating |
| Duolingo UK Limited | London | A rating |
| Dupe VFX Limited | London | A rating |
| Dur Fayez Estates Limited | London | A rating |
| DURA Automotive Body & Glass Systems UK Ltd | Birmingham | A rating |
| DURA BEDS LTD | Batley | A rating |
| DURA COMPOSITES LTD | CLACTON | A rating |
| DURABLE BUILDERS LTD | Bradford | A rating |
| Duracell UK Ltd | Richmond | A rating |
| DURACHEM LTD TRADING AS JACKMANS PHARMACY | HERTS | A rating |
| DURACOLOR UK LTD | LONDON | A rating |
| Duradiamond Software Ltd | Dunfermline | A rating |
| Durai Retail LTD | Tyne and Wear | A rating |
| Durajoin Ltd | Hitchin | A rating |
| DURALEAN UK LTD | Leicester | A rating |
| Duralock (UK) Limited | Chipping Norton | A rating |
| Durani Foods Ltd | Burnley | A rating |
| Durata UK Ltd | Middlesbrough | A rating |
| Duratem Supported Living Ltd | Dagenham | A rating |
| Durban Curry Club | Brighton | A rating |
| Durbar Hospitality Limited T/A Gurkha Royale Restaurant & Bar | Windsor | A rating |
| DURDLE UK LIMITED | Hounslow | A rating |
| Durell Software Ltd | Taunton | A rating |
| Duress UK Limited | Beaconsfield | A rating |
| DURGA AND SONS LTD T/A Jay Shree Krishna Jewellers UK | South Harrow | A rating |
| Durga Traders Limited t/a Lordship News Food and Wine | London | A rating |
| Durham Asset Management Ltd T/a The White Swan Hotel | Halifax | A rating |
| Durham Careline Ltd | Newcastle upon Tyne | A rating |
| Durham City Cricket Club | Durham | A rating |
| Durham County Council | Spennymoor | A rating |
| Durham Cricket CIC | CHESTER-LE-STREET | A rating |
| Durham Dales Health Federation | Bishop Auckland | A rating |
| Durham Diocesan Board of Finance | Durham | A rating |
| Durham Korean Church | Durham | A rating |
| Durham Magneto Optics Ltd | Toft | A rating |
| Durham Specsavers Limited | Durham | A rating |
| Durham Tech Ltd | Durham | A rating |
| DURHAM UK BUILDERS LTD | DURHAM | A rating |
| Durham Women Football Club Ltd | Durham | A rating |
| durhamlane | North Shields | A rating |
| durhamlane | Newcastle upon Tyne | A rating |
| DURJA RETAIL LIMITED T/A Day Today | Tranent | A rating |
| Durka Traders Ltd | Milton Keynes | A rating |
| Durlston Partners London Limited | London | A rating |
| Durnell Marketing Limited | Tunbridge Wells | A rating |
| Durr Ltd | Warwick | A rating |
| Durra Al-Baqa UK Ltd | London | A rating |
| DURRANI BROTHERS LTD | Bradford | A rating |
| DURRANT HOTEL LIMITED | Bideford | A rating |
| Durrants Gym Ltd | London | A rating |
| Durrington Multi Academy Trust | Durrington | A rating |
| Dursemoor Limited ta MRP Group | Hainault | A rating |
| Durst Image Technology UK Ltd | Leatherhead | A rating |
| DURSTON HOUSE SCHOOL EDUCATIONAL TRUST LTD | EALING | A rating |
| DURWIN GLAZING LTD | Southall | A rating |
| Dusden Ltd | Suffolk | A rating |
| Dust Design Ltd | Winchester | A rating |
| DUSTANA LTD | CARDIFF | A rating |
| Dustolex Limited | Littleborough | A rating |
| Duszi & Co Group Ltd | Chard | A rating |
| Dutee4U HOME HEALTH CARE | Stoke-On-Trent | A rating |
| DUTT LIMITED | Brentford | A rating |
| Dutta A Star Limited T/A The Varandah | Leicester | A rating |
| Dutta and Sons Limited | Derby | A rating |
| Duttkrupa limited | Bristol | A rating |
| Duty Care Limited | Wimborne | A rating |
| DUTY GUARD SECURITY LTD | Manchester | A rating |
| Duua Ltd | Portsmouth | A rating |
| Dux Advisory Limited | Aylesbury | A rating |
| Dux Global Services Ltd. | New Malden | A rating |
| DUYNIE INGREDIENTS LIMITED | Wrexham | A rating |
| Duza limited | London | A rating |
| DV Catering Ltd t/a Eatalians | Swansea | A rating |
| DV Marine Ltd. | Falmouth | A rating |
| DV SUPPLIES LTD | London | A rating |
| DVA KITCHENS BEDROOMS SHOP FITTINGS LTD | Southall | A rating |
| Dvanguard LTD | Dartford | A rating |
| DVM BOOZE LTD | Leicester | A rating |
| DVM Global Limited | London | A rating |
| DVMI LTD | GLOUCESTER | A rating |
| DVMSERVICES(UK) LTD | Hayes | A rating |
| DVP Sai Ltd T/A Southwark Park Road Post Office | London | A rating |
| DVT Global (UK) Ltd | London | A rating |
| DVV Media International | Sutton | A rating |
| DW ARGO LTD | Stonehaven | A rating |
| DW Fisheries Limited | Sidmouth | A rating |
| DW LONDON ESTATES LIMITED | London | A rating |
| DW Studio LTD | Caerphilly | A rating |
| Dwaraka Limited T/A Krishnas Inn | Bristol | A rating |
| DWARKADHISH ENTERPRISE LTD | LANCASHIRE | A rating |
| Dwarkesh Bawa LTD | Smethwick | A rating |
| DWC Architecture Limited | Southampton | A rating |
| DWC CLEARANCE LTD | MANCHESTER | A rating |
| DWC Enterprises Ltd | Newcastle upon Tyne | A rating |
| DWCC Ltd | Bristol | A rating |
| DWD Property and Planning Limited | London | A rating |
| DwD Renewables Ltd | London | A rating |
| Dwealth Healthcare Limited | Sittingbourne | A rating |
| Dwell Homecare Limited | Birmingham | A rating |
| Dwell-In Group of Companies Ltd | Corby | A rating |
| Dwellings Property Consultancy Ltd | Birmingham | A rating |
| DWF Group Limited | London | A rating |
| DWI Partners UK Limited | London | A rating |
| Dwight School London | London | A rating |
| DWIP Consultants Ltd | Coventry | A rating |
| DWK Life Sciences Limited | Stoke-on-Trent | A rating |
| Dworkin UK Ltd | Hemel Hempstead | A rating |
| DWORKS LTD | London | A rating |
| DWP and Sons Ltd | Stoke on Trent | A rating |
| DWR CYMRU CYFYNGEDIG | Cardifff | A rating |
| DX Caring Services Limited | Letchworth Garden City | A rating |
| DX CELLS TECHNOLOGIES CO., (UK) LIMITED | London | A rating |
| DX Network Services Limited | Slough | A rating |
| DXB AUTOS LTD | Birmingham | A rating |
| DXB PERFUME RETAIL LIMITED | Bradford | A rating |
| DXB RETAIL LIMITED | Gloucester | A rating |
| Dxcover Ltd | Glasgow | A rating |
| DXG Investments Ltd | Birmingham | A rating |
| DXN INTERNATIONAL (UK) LIMITED | London, England | A rating |
| DXS UK Limited | Elstead | A rating |
| DXT Climate Solutions Limited | London | A rating |
| DY UK TRANSPORT LTD | London | A rating |
| Dyaco UK Limited | Milton Keynes | A rating |
| DYAD ARTIFICIAL INTELLIGENCE LIMITED | LONDON | A rating |
| Dyal Homes Ltd | Telford | A rating |
| Dyalog Limited | Bramley | A rating |
| DYDO DRINCO UK LTD | Ealing | A rating |
| Dye & Durham (UK) Limited | London | A rating |
| Dyer Baade & Company Advisory Ltd | London | A rating |
| Dyer Baade & Company Limited | London | A rating |
| DYERECYCLE | LONDON | A rating |
| Dyfed Steels Ltd | Llanelli | A rating |
| Dyffryn Tywi Equine Clinic | Carmarthen | A rating |
| Dylan Foods Ltd T/A Manor View Stores | Binbrook, Market Rasen | A rating |
| Dylan Sandhu Trading as G's Takeaway | Kempston | A rating |
| Dylan's Group Ltd | Llangefni | A rating |
| DYLAN'S RESTAURANT LTD | Llangefni | A rating |
| Dylogics Limited | iLford | A rating |
| DYMAG TECHNOLOGIES LIMITED | Chippenham | A rating |
| Dymatec Ltd | Houghton Regis | A rating |
| DYMCHURCH FISH BAR LIMITED | Kent | A rating |
| DYN-METAL LTD. | London | A rating |
| Dynabite Limited | Newcastle Upon Tyne | A rating |
| DynAikon Ltd | Milton Keynes | A rating |
| DYNALINER LTD | London | A rating |
| DYNAMATIC LIMITED UK | Swindon | A rating |
| Dynamatix Ltd | Milton Keynes | A rating |
| Dynament Limited | Mansfield | A rating |
| Dynamic Air Services Ltd | Iver Heath | A rating |
| Dynamic Art Nest Co Ltd T/A Propak UK | Horsham | A rating |
| DYNAMIC BLENDS LIMITED,TA ShakeTastic Pinner | Pinner | A rating |
| Dynamic Care Services Ltd | Leicester | A rating |
| Dynamic Care Support Ltd | London | A rating |
| Dynamic CCTV Limited | Middlesbrough | A rating |
| Dynamic Chiropractic Ltd | Sale | A rating |
| Dynamic Design Consultants Ltd | Banbridge | A rating |
| Dynamic Education Services LTD | London | A rating |
| Dynamic Environments Group Ltd | London | A rating |
| Dynamic Food Services Ltd | London | A rating |
| Dynamic Force Guarding Ltd | Barking | A rating |