| Sella Controls Limited | Ashby De La Zouch | A rating |
| SELLA SUPERMARKET LTD | Hatfield | A rating |
| Selladoor Worldwide Limited | Sevenoaks | A rating |
| Sellafield Ltd | Seascale | A rating |
| Sellar Design & Development Ltd | London | A rating |
| Sellathurai Rudralingam T/A Woodland Convenience Store | Kenilworth | A rating |
| Sellens Business Services Ltd t/a 'Rowland Smith' | Polegate | A rating |
| SELLERTREE LTD | Bolton | A rating |
| Sellery Ltd | London | A rating |
| SELLIAH VASANTHAN T/A VMV FOOD & WINE | Birmingham | A rating |
| Sellindge Surgery | Ashford | A rating |
| Selling Master Ltd | Birmingham | A rating |
| SELLING UNITED LTD | Oldham | A rating |
| Sellyoak-Stirchley Tyres Limited | Birmingham | A rating |
| Selo LTD | Erith | A rating |
| Seloxium Limited | Oxford | A rating |
| Selsdon Spice Limited | London | A rating |
| SELTFAR LTD | London | A rating |
| SELVA & SONS LTD | Orpington | A rating |
| Selvarajah Kannan & Santhini KannanT/A Right Choice | Kent | A rating |
| Selvarajah Manimaran T/A MERCI | Harrow | A rating |
| SELVARAJANI RAKAVAN T/A BIGGINHILL NEWS AND POST OFFICE | Biggin Hill | A rating |
| Selvarasa Thesanathan | Ellesmere Port | A rating |
| Selvasothy Jayapiragas T/As Cluster 4017 | Surrey | A rating |
| Selvy Ltd | Wales | A rating |
| Selwood Limited | Chandlers Ford | A rating |
| Selworthy Vets Ltd | Kingsbridge | A rating |
| Selwyn College | Cambridge | A rating |
| SEM Contracting & Consulting Ltd | London | A rating |
| SEM EDUCATION CONSULTANCY LTD | Birkenhead | A rating |
| SEMANI LTD t/a VICOLI DI NAPOLI | London | A rating |
| Semarchy Limited | Maidenhead | A rating |
| Semarion Ltd | Cambridge | A rating |
| Sematics Limited | Birmingham | A rating |
| Sembcorp | Middlesbrough | A rating |
| Semco Maritime Limited | Westhill | A rating |
| Semefab Ltd | Glenrothes | A rating |
| Semfex Solutions Limited | Worcester Park | A rating |
| Semilattice Ltd | London | A rating |
| Semiwise Limited | Glasgow | A rating |
| Semmco Ltd | Woking | A rating |
| SEMNOX SOLUTIONS LTD | Reading, | A rating |
| Semo Limited T/A subway | Barry | A rating |
| SEMP Ltd | Bristol | A rating |
| Semper Anticus Polo Team | Cirencester | A rating |
| Semper Care LTD | Bradford | A rating |
| SEMPER FIRE ENGINEERING LIMITED | London | A rating |
| Semtech Limited | Romsey | A rating |
| SEMTRONICS LIMITED | Aylesbury | A rating |
| Semy Care Ltd | Norwich | A rating |
| SEN CATERING SERVICES LTD T/A CAFE SEN | BLETCHLEY | A rating |
| Sen Lin Perth Limited | Glasgow | A rating |
| SEN MORNING TRADE LIMITED | Bognor Regis | A rating |
| SEN VN LTD | London | A rating |
| SEN YOGA LTD | London | A rating |
| SEN-THERAPY LIMITED | Macclesfield | A rating |
| SENA CARE SERVICES | Egham | A rating |
| Sena Trade & Consulting Ltd | London | A rating |
| Senad Investments Ltd | Derby | A rating |
| SENARP LIMITED | Barking | A rating |
| Senbla Ltd | London | A rating |
| Senceive Limited | Milton Keynes | A rating |
| Sencon (UK) Ltd | Droitwich | A rating |
| SEND & RECEIVE WORLDWIDE UK | SLOUGH | A rating |
| Send 2 Family Ltd | London | A rating |
| Send and Sensory Ltd | London | A rating |
| Send Money India Limited | Birmingham | A rating |
| Sendible Limited | London | A rating |
| SENDIN LTD | London | A rating |
| Sendmarc Limited | London | UK Expansion Worker: Provisional |
| SendSpend Limited | London | A rating |
| SENDY2511021 LTD. | Leicester | A rating |
| Seneca Group International UK LTD | London | A rating |
| Seneca Learning Ltd | London | A rating |
| Seneca London LLP | London | A rating |
| Sener Engineering & Systems LTD | London | A rating |
| Senergy Innovations Ltd | BELFAST | A rating |
| Senescence Care Agency Ltd | Chesterfield | A rating |
| SENEX LIMITED | Sutton Coldfield | A rating |
| Senfi UK Limited | Begbroke | A rating |
| SENGO INTERNATIONAL PROMOTIONS LTD | LONDON | A rating |
| SENIGUK CONSULTING LTD | Harlow | A rating |
| Senikma Natural Foods UK Ltd | Watford | A rating |
| Senior Architectural Systems Limited | Doncaster | A rating |
| Senior Internet Limited | Nottingham | A rating |
| Senior Moments Care LLP | Lytham St Annes | A rating |
| Senior UK Ltd t/a Senior Aerospace BWT | Adlington | A rating |
| Seniors Helping Seniors (UK) Limited | Canterbury | A rating |
| Seniors In Touch | London | A rating |
| Senisca Limited | Exeter | A rating |
| SenKenKen Limited | BISHOP'S STORTFORD | A rating |
| Senko Advanced Components (Euro) Ltd | Basingstoke | A rating |
| Senkoun Healthcare Wakering LTD | Southend-On-Sea | A rating |
| SENKOUN INTEGRATED HEALTHCARE SOLUTIONS LTD | Clacton-on-sea | A rating |
| Sennep Ltd | London | A rating |
| Sennheiser UK Limited | Buckinghamshire | A rating |
| Senning (UK) Ltd | London | A rating |
| SENOL AND SENOL LTD | Manchester | A rating |
| Senorita Ltd | Oldham | A rating |
| SENOVO IT LTD | LONDON | A rating |
| Sensa Waste Solutions Ltd | Sheffield | A rating |
| Sensat Digital Limited | London | A rating |
| Sensata Technologies Intermediate UK Limited | Swindon | A rating |
| SENSATIONAL KIDS LTD | EPSOM | A rating |
| Sensational Luxury Services Ltd | Walworth | A rating |
| SENSE BIODETECTION LIMITED | Abingdon | A rating |
| Sense Int Limited | London | A rating |
| Sense Media Group Ltd. | Broadbridge Heath | A rating |
| Sense of Security Limited | Aylesford | A rating |
| Sense Range Limited | Manchester | A rating |
| Sense Street Limited | London | A rating |
| SENSE WIND Ltd | Cambridge | A rating |
| SENSE X LTD | London | A rating |
| Senseco Systems Ltd | Gillingham | A rating |
| SENSEON TECH LTD | London | A rating |
| Senseye Ltd | Southampton | A rating |
| Senshi-Japan LTD | Worsley | A rating |
| Sensi Labs Ltd | London | A rating |
| Sensible Biotechnologies Limited | Oxford | A rating |
| Sensible Development Ltd | Brighton | A rating |
| Sensient Flavors Limited | Milton Keynes | A rating |
| Sensing Feeling Limited | London | A rating |
| Sensio Limited | Castleford | A rating |
| Sensitive Care Solutions Ltd | Leicester | A rating |
| Sensium Healthcare Limited | Abingdon | A rating |
| Sensize Limited | Cambridge | A rating |
| Senso Distribution Limited | London | A rating |
| Sensonic-UK Limited | Farnborough | A rating |
| Sensopart UK Limited | Melton Mowbray | A rating |
| Sensor Coating Systems Ltd | Dagenham East | A rating |
| Sensor Tower UK Ltd | London | A rating |
| Sensoria North West Limited | Tarporley | A rating |
| Sensoteq Ltd | Belfast | A rating |
| Senstronics Ltd | Newton Aycliffe | A rating |
| Sensu Dentistry | London | A rating |
| Sensus Health & Wellness Ltd | London | A rating |
| Sent Entertainment Limited | London | A rating |
| Sent Into Space Ltd | Sheffield | A rating |
| Sentario UK Limited | Watford | A rating |
| Senthan Ltd | Copmanthorpe | A rating |
| Sentiental Ltd | Glasgow | A rating |
| Sentify Ltd | London | A rating |
| Sentim Ltd T/A Fladbury News & Food | London | A rating |
| Sentimental Care Limited | Somerset | A rating |
| Sentimex Care Ltd | Derby | A rating |
| SENTINAL OPERATIONS LTD | LONDON | A rating |
| Sentinel | London | A rating |
| Sentinel Care LTD | Telford | A rating |
| Sentinel Epos and Solutions Ltd | Cleckheaton | A rating |
| Sentinel Force Ltd | London | A rating |
| SENTINEL GUARDING LIMITED | Bradford | A rating |
| Sentinel Health Care Limited | Elstead | A rating |
| Sentinel Healthcare SW CIC | Plymouth | A rating |
| Sentinel International Ltd | Tunbridge Wells | A rating |
| Sentinel Labs Limited | Cheltenham | A rating |
| Sentinel Legal Services Limited | London | A rating |
| Sentinel Performance Solutions Ltd | Warrington | A rating |
| Sentinel Technologies Ltd | Manchester | A rating |
| Sention Technologies Limited | London | A rating |
| Sentium Technologies Ltd | London | A rating |
| SENTPOINT PROPERTIES LIMITED | Kingston Upon Thames | A rating |
| SentriCare Limited | Walsall | A rating |
| Sentry Aerospares Limited | Watford | A rating |
| Sentry Care Limited | Beaconsfield | A rating |
| Sentry Fire Safety Group Doncaster Limited | Doncaster | A rating |
| Sentry Ltd | Ipswich | A rating |
| SentryBay Limited | London | A rating |
| Senyap Transport Limited | Boroughbridge | A rating |
| Senzo Health Limited | London | A rating |
| SEO London | London | A rating |
| SEO Premier Limited | Stockport | A rating |
| SEOMG Limited | Brighton & Hove | A rating |
| Seon Consultancy Limited | Dundee | A rating |
| SEON TECHNOLOGIES UK LTD | London | A rating |
| Seopa Ltd | Belfast | A rating |
| SEOUL BIRD WESTFIELD LONDON LIMITED | LONDON | A rating |
| Seoul Money Brokerage Services, Ltd. London Representative Office | London | A rating |
| Seoul Residential Limited | Surrey | A rating |
| SEOUL&TOKYO LTD | Stockport | A rating |
| SEOVALLEY LTD | London | A rating |
| SEP (Site Engineering Personnel) Ltd | Ormskirk | A rating |
| SEP Rail Design Ltd | York | A rating |
| Sephoras Fame Limited | London | A rating |
| Seplat Energy UK Limited | London | A rating |
| SEPT GROUP LIMITED | London | A rating |
| Sepura Limited | Cambridge | A rating |
| Seqirus UK Limited | Maidenhead | A rating |
| Sequani Limited | Ledbury | A rating |
| SEQUANS COMMUNICATIONS LIMITED | READING | A rating |
| Sequel Business Solutions Ltd | London | A rating |
| Sequel Support Ltd | Bournemouth | A rating |
| Sequel Technologies Ltd | London | A rating |
| Sequence HQ Ltd | Canterbury | A rating |
| Sequence International Limited | London | A rating |
| Sequent (U.K.) Limited | London | A rating |
| SEQUENTIAL SERVICES LTD TA AMANS NEWTON | Newton-le-Willows | A rating |
| Sequential Skin Ltd | Kings Lynn | A rating |
| Sequentis Health LTD | Teddington | A rating |
| Sequoia Capital LLP | London | A rating |
| Sequoia CH Group LTD | Barnsley | A rating |