| Cottage Spice Ltd | Southsea | A rating |
| Cottagefield Stables Limited | Hereford | A rating |
| Cottam & Brookes Engineering Co (1985) Limited | Caerphilly | A rating |
| Cottam Brush Ltd | Hebburn | A rating |
| Cotteswold House Dental Care (Gloucester) Ltd | Gloucester | A rating |
| Cottimore Local Limited T/As Nisa Local | Surrey | A rating |
| Cottin Leisure Ltd | Sunderland | A rating |
| Cottingham Waltham LTD | Grimsby | A rating |
| Cottingley Mini Market | Bradford | A rating |
| Cottingley Pharmacy | Leeds | A rating |
| Cotton Canal Limited | Coventry | A rating |
| Cotton On UK (Pty) Ltd. | London | A rating |
| Cotton Passion UK Ltd | Linthithgow | A rating |
| COTTONCLUB LONDON LIMITED | Ilford | A rating |
| Cottoncomfort UK LTD | Tyseley | A rating |
| Cottongrass Homes Limited | Bramhall | A rating |
| Cottonmill linen Limited | Welwyn Garden City | A rating |
| Cottonrake Cafe Ltd | GLASGOW | A rating |
| Cottons Chartered Accountants llp | Northampton | A rating |
| COTTRELL PARK LTD | CARDIFF | A rating |
| Cotts equine Ltd | NARBERTH | A rating |
| COTY Services UK Limited | Ashford | A rating |
| Cou Cou Intimates Ltd | London | A rating |
| Couch Craft Ltd T/A Chesterfield Crouch Craft | Birmingham | A rating |
| COUCH CRAFTWORKS LIMITED | Burnley | A rating |
| Couchbase Limited | London | A rating |
| Coucou Flora Ltd | London | A rating |
| Couette Limited | Altrincham | A rating |
| Cougar Automation Limited | Waterlooville | A rating |
| Cougar Industries limited | Berkhamsted | A rating |
| Cougarmania Ltd | Keighley | A rating |
| Coulby Medical Practice | Middlesbrough | A rating |
| Coulier Creatures FX Ltd | Redbourn | A rating |
| Coulsdon Dental Clinic Limited | Birmingham | A rating |
| Coulson and Collings Care Home LTD | Bolton | A rating |
| Coulter Partners | London | A rating |
| Council for Licensed Conveyancers | London | A rating |
| Council for World Mission (UK) | London | A rating |
| Council of British Pakistanis (Scotland) | Edinburgh | A rating |
| Council of Local Authorities for International Relations, London | London | A rating |
| Count Energy Distribution Limited | Loughton | A rating |
| Count LTD | London | A rating |
| Count Technologies Ltd | London | A rating |
| Counter Culture Europe Limited | Saron, Ammanford, | A rating |
| Counteract Partners Limited | London | A rating |
| Counterpoint Global Media Limited | LONDON | A rating |
| Countess of Chester NHS Foundation Trust | Chester | A rating |
| Countfire Limited | Wimbledon | A rating |
| Counting Seconds UK Limited | Birmingham | A rating |
| Counting Solutions Limited | Redditch | A rating |
| COUNTRY CITY CATERING LIMITED | Mitcham | A rating |
| Country Court Care Homes 10 Limited | Werrington | A rating |
| Country Court Care Homes 11 OpCo Limited | Peterborough | A rating |
| COUNTRY COURT CARE HOMES 14 LIMITED | Peterborough | A rating |
| Country Court Care Homes 15 OpCo Limited | Peterborough | A rating |
| Country Court Care Homes 2 Ltd | Werrington | A rating |
| Country Court Care Homes 3 OpCo Limited | Werrington | A rating |
| Country Court Care Homes 5 Limited | Peterborough | A rating |
| COUNTRY COURT CARE HOMES 6 LIMITED | WERRINGTON | A rating |
| Country Court Care Homes 7 Opco Limited | Werrington | A rating |
| Country Court Care Homes Limited | Werrington | A rating |
| Country Homes For Children Limited | Stone | A rating |
| Country House Care Limited | Spetisbury | A rating |
| COUNTRY HOUSE RESTAURANTS LIMITED T/A SECRET ALLEY | Portsmouth | A rating |
| Country House Weddings Ltd | Barnet | A rating |
| COUNTRY LODGE NURSING HOME LTD T/A COUNTRY LODGE NURSING HOME | WORTHING | A rating |
| COUNTRY PIZZA LTD. | Gloucestershire | A rating |
| Country Produce LTD T/A Londis | Chelmsford | A rating |
| Countryside Art Ltd | Spilsby | A rating |
| Countrywide Accountants Ltd | London | A rating |
| Countrywide Electrical Distributors Ltd | DAGENHAM | A rating |
| Countrywide Foods Limited | Glasgow | A rating |
| Countrywide Healthcare Ltd | Barnsley | A rating |
| Countrywide Hotels Limited | Newton Abbott | A rating |
| COUNTRYWIDE INDUSTRIAL CLEANING SERVICES LTD | Bilston | A rating |
| COUNTWISE ADVISORS LTD | Manchester | A rating |
| County Accountants Limited | Streatham | A rating |
| COUNTY BUSINESS SERVICES LIMITED | London | A rating |
| County Cabs Limited | Woking | A rating |
| County Care Berkshire Ltd | Windsor | A rating |
| County Care Homes Limited T/A Norwood House | Ilford | A rating |
| County Cars (2003) Limited | Tipton | A rating |
| County Durham and Darlington NHS Foundation Trust | Darlington | A rating |
| COUNTY FOOD INGREDIENTS LTD | Wilmslow | A rating |
| County Heights Limited T/A County Heights Pharmacy | Deal | A rating |
| County Homes Care Home | Wirral | A rating |
| County Homesearch International Ltd | Truro | A rating |
| County Hotel ,Stornoway | Stornoway | A rating |
| COUNTY KITCHENS AND INTERIORS LTD | Dagenham | A rating |
| County Milk Products Limited | Wilmslow, | A rating |
| County Motors Leigh Ltd | Leigh | A rating |
| COUNTY NEWS SHOP LTD | Perth | A rating |
| County Oak Services Ltd | Crawley | A rating |
| County Private Client Ltd | London | A rating |
| County Road Dental Practice | Liverpool | A rating |
| County Supplies (London) Limited | London | A rating |
| COUNTY TOWN ESTATES LIMITED | Deeside | A rating |
| County Turf Limited | Scunthorpe | A rating |
| Coupa Software UK Ltd | London | A rating |
| Couper & Coulter Pharmacies Ltd | Chester | A rating |
| COURAGE GLOBAL SCHOOL LIMITED | BURY | A rating |
| Courage Healthcare Ltd | Maidstone | A rating |
| Courage Healthcare West Midlands | Dudley | A rating |
| Coure Security Ltd | Bristol | A rating |
| Courier Box Ltd | London | A rating |
| Courier Holdings Ltd | London | A rating |
| Courmacs Legal Limited | Blackburn | A rating |
| Course5 Intelligence Limited | London | A rating |
| Coursera UK Limited | London | A rating |
| Court Drive Dental Practice | Hillingdon | A rating |
| Court Hotel (Bromley) Limited(The) T/A The Bromley Court Hotel | Bromley | A rating |
| Court House (Cheddar) Ltd | Cheddar | A rating |
| Court House (Malvern) Limited | Malvern | A rating |
| Court House Farms Ltd. | York | A rating |
| Court Thorn Surgery | Carlisle | A rating |
| Courtauld Institute of Art | London | A rating |
| COURTCARE FLEXI LIMITED | Milton Keynes | A rating |
| COURTCORRECT LTD | London | A rating |
| Courtesy Cars Redhill Limited | Redhill | A rating |
| Courtfield Healthcare Limited | BRISTOL | A rating |
| Courthall Care Ltd | Liverpool | A rating |
| Courtney Smith Solicitors LLP | London | A rating |
| COURTNEY-THORNE LTD | Bournemouth | A rating |
| Courtside Surgery | Yate | A rating |
| CourtX Ltd | Southsea | A rating |
| Courtyard Dental Practice | Shrewsbury | A rating |
| Courtyard Surgery | Horsham | A rating |
| Cousins & Cousins Ltd | London | A rating |
| Coussins Associates LLP | East Sheen | A rating |
| Cov Connect Limited | Coventry | A rating |
| Cov Driving School Ltd | Coventry | A rating |
| Cov Tech Ltd | Coventry | A rating |
| Covalense Global UK Private Limited | London | A rating |
| Covalent Systems Limited | Beaconsfield | A rating |
| Covalis Capital LLP | London | A rating |
| Covarius Technology Limited | London | A rating |
| Covasant Technologies (UK) Private Limited | London | A rating |
| Covatic Ltd | Birmingham | A rating |
| COVBUN LTD | Coventry | A rating |
| COVE CRICKET CLUB | FARNBOROUGH | A rating |
| Cove Leaseco Limited | Belfast | A rating |
| COVE MANOR CARE HOME LIMITED | DUNGANNON | A rating |
| Cove Park | Helensburgh | A rating |
| Cove Rangers Football Club | Aberdeen | A rating |
| COVE RETAILERS LTD | ABERDEEN | A rating |
| Covea Insurance Services Limited | Halifax | A rating |
| Covecta LTD | London | A rating |
| Covenant Care Support LLP | Wellington | A rating |
| Covenant Healthcare Ltd | Coventry | A rating |
| Covenant Mission Care Ltd T/A Spencer House | Birchington | A rating |
| Covenant of Mercy Ltd | Canary Wharf, London | A rating |
| Covenant Players (UK) Trust | Pontypool | A rating |
| COVENANT RESTORATION CHAPEL INTERNATIONAL | READING | A rating |
| Covent Garden Dragon Hall Trust | London | A rating |
| Covent Garden FX LTD | London | A rating |
| COVENT GARDEN HARDWARE STORE LTD T/A The Lowdown | London | A rating |
| COVENT GARDEN MARKET AUTHORITY | LONDON | A rating |
| Coventry & Rugby GP Alliance | Coventry | A rating |
| Coventry and North Warwickshire Cricket Club | Coventry | A rating |
| Coventry and Warwickshire Partnership Trust | Coventry | A rating |
| COVENTRY APPLIANCE WORLD LTD | Coventry | A rating |
| Coventry Asian Sports Federation | Coventry | A rating |
| Coventry Chemicals Limited | Coventry | A rating |
| Coventry City Council | Coventry | A rating |
| Coventry City Football Club Limited | Coventry | A rating |
| Coventry College | Coventry | A rating |
| Coventry Diocesan Board of Finance | Coventry | A rating |
| coventry food & mood ltd | warwick | A rating |
| COVENTRY GRILL LTD (PIZZA CLUB) | TELFORD | A rating |
| Coventry Home UK Ltd | Coventry | A rating |
| Coventry Property Certification Limited | Coventry | A rating |
| Coventry Rugby Limited | Coventry | A rating |
| Coventry School Foundation | Coventry | A rating |
| Coventry Shri Sidhi Vinayagar Devasthanam | Coventry | A rating |
| Coventry Specsavers Hearcare Limited | Coventry | A rating |
| Coventry Sterling Motors Ltd | Coventry | A rating |
| Coventry Street Services Limited | London | A rating |
| Coventry Taxis and Coaches | Coventry | A rating |
| Coventry University | Coventry | A rating |
| Coventry University Students Union Limited | Coventry | A rating |
| COVENTRY XIONGQI LTD | Coventry | A rating |
| CoventryGP.Com Group Of Practices | Coventry | A rating |
| Coveo (Europe) B.V. | London | A rating |
| Cover Genius Ltd | London | A rating |
| Cover-More Insurance Services Ltd | Uxbridge | A rating |
| Coverage Care Services Ltd | Shrewsbury | A rating |
| Covered Buckles Ltd | Ilford | A rating |
| Coveris Flexibles Holdings UK Limited | Pinchbeck | A rating |
| Coveris Flexibles UK Limited | Spalding | A rating |
| Covernet | Coleraine | A rating |
| COVERT GROUP LTD | Croydon | A rating |
| Covertech Limited | Solihull | A rating |
| Coverwise Holdings Limited | Worthing | A rating |
| Covesion Limited | Nursling | A rating |
| COVESTOR LTD | LONDON | A rating |
| Covey Ltd | Pencaitland | A rating |
| Covington & Burling LLP | London | A rating |
| Covnetics Limited | Nuneaton | A rating |
| COVVI LIMITED | Leeds | A rating |
| Cow and Bean | Orpington | A rating |