| Sinnergy Limited | Birmingham | A rating |
| Sinnis International Trading Ltd | Portslade, Brighton | A rating |
| Sino Textile Co. Ltd. | London | A rating |
| Sinoboom UK Ltd | Derby | A rating |
| Sinocampus UK Ltd | London | A rating |
| Sinochem (United Kingdom) Ltd | London | A rating |
| Sinochem International Oil (London) Co Limited | London | A rating |
| Sinoledge Limited | London | A rating |
| Sinolingua London Limited | London | A rating |
| Sinomax International Limited | Hampton | A rating |
| Sinomax International Ltd | London | A rating |
| Sinomine Specialty Fluids Ltd | Aberdeen | A rating |
| Sinopec Century Bright Capital Investment (UK) Limited | London | A rating |
| Sinosure | London | A rating |
| SINOWAVE UK LTD | London | A rating |
| SINOWEI LIMITED | London | A rating |
| SINOX STAR FX LIMITED | Newcastle Upon Tyne | A rating |
| Sintali Ltd | Rickmansworth | A rating |
| SINTEC UK LIMITED | LONDON | A rating |
| Sintecmedia WEM Ltd | Herts | A rating |
| Sinthujan Mahalingam T/A Oakwood General Store | Tyne and Wear | A rating |
| Sinthula Nishanthan | Swansea | A rating |
| SINTL LTD | Mitcham | A rating |
| Sioma Professionals Ltd | London | A rating |
| Sion Catholic Community for Evangelism | Coventry | A rating |
| SIOP MENAI (BANGOR) LTD T/A SIOP MENAI | Bangor | A rating |
| SIP Car Parks Limited | Manchester | A rating |
| SIPANDWAFFLE LIMITED | London | A rating |
| SIPCO HEALTHCARE UK LTD T/A MEDWIN PHARMACY | ROTHERHAM | A rating |
| SIPRAL UK LIMITED | London | A rating |
| Sipral UK Ltd | London | A rating |
| SIPSON SUPERSTORE LTD | Westdrayton | A rating |
| SIR 888 ltd | Birmingham | A rating |
| Sir Devonshire Hotel Ltd | London | A rating |
| Sir Frank Lowe | London | A rating |
| Sir George Monoux College | London | A rating |
| Sir Henry Floyd Grammar School | Aylesbury | A rating |
| Sir Jacob Behrens & Sons Ltd | Manchester | A rating |
| Sir John Hunt Community Sports College | Plymouth | A rating |
| Sir Mark Prescott BT. | Newmarket | A rating |
| SIR PLUS LIMITED | London | A rating |
| Sir Richard Sutton Limited | London | A rating |
| SIR SUN TAKEWAY & RESTAURANT LTD | Oxford | A rating |
| SIR-AJ & CO ASSOCIATES LTD | Birmingham | A rating |
| Siraat Ltd | Nelson | A rating |
| SIRAF ASSOCIATES LIMITED | London | A rating |
| Siraj Curry House Ltd | Bolton | A rating |
| SIRAJ TECHUP LTD | Stockton-On-Tees | A rating |
| Sirasa Ltd | Bristol | A rating |
| Sirdarji Couriers Limited | Walsall | A rating |
| SIRE HOLDINGS LIMITED | London | A rating |
| SIRE Technology Ltd | Crowthorne | A rating |
| Sirens Design Limited | London | A rating |
| SIRG UK Ltd | Corby | A rating |
| Siri Guru Nanak Darbar (Sikh Temple) | Gravesend | A rating |
| Siri Guru Singh Sabha | CRAWLEY | A rating |
| Siri Guru Singh Sabha Gurdwara | Reading | A rating |
| Siri Guru Singh Sabha Gurdwara, Bristol | Bristol | A rating |
| Siri Guru Singh Sabha Northampton | Northampton | A rating |
| SIRI GURU SINGH SABHA, CROYDON | Croydon | A rating |
| SIRI HEALTH CARE SOLUTIONS LTD | Ilford | A rating |
| Siri Lifestyle Limited | London | A rating |
| Siri Spices Limited | London | A rating |
| Siri Tech Services Ltd | Luton | A rating |
| SIRI TECHNOLOGY SOLUTIONS LIMITED | BRENTWOOD | A rating |
| SIRI TRADING LTD | Staines | A rating |
| Sirio Multilateral Strategies Ltd | London | A rating |
| SirionLabs Limited | London | A rating |
| Sirius Aerospace Manufacturing | Rugby | A rating |
| Sirius Constellation Ltd | Godalming | A rating |
| SIRIUS FIBER LTD | London | A rating |
| Sirius Powertrain Ltd | Shoreham-by-sea | A rating |
| Sirius Remediation Ltd | Leeds | A rating |
| SiriusPoint International Insurance Corporation | London | A rating |
| Sirkka Networks Ltd | London | A rating |
| Siro Clinpharm UK Limited | Middlesex | A rating |
| Sirona care & health | Yate | A rating |
| SIROS DESIGN LTD | Smethwick | A rating |
| Sirron Technologies Limited | Glastonbury | A rating |
| Sirtex Medical United Kingdom Ltd | London | A rating |
| Sirus Automotiove | Wednesbury | A rating |
| Sirwan Food Centre Limited | Edmonton | A rating |
| SIS (UK) Limited | Maryport | A rating |
| SIS Design Limited | Birmingham | A rating |
| SIS Global Limited | Derbyshire | A rating |
| SiSaf Ltd | Guildford | A rating |
| Sisco Entertainment Ltd | Lower Stondon | A rating |
| Sisco Foods Limited | Radlett | A rating |
| Sisecam UK PLC | London | A rating |
| SISHIRE EDUCATION CONSULTANCY LTD | London | A rating |
| SISHU LIMITED | LONDON | A rating |
| SISI (UK) LTD | Isleworth | A rating |
| SISL INFOTECH UK LTD | UXBRIDGE | A rating |
| Sisley UK Limited | London | A rating |
| Sismek ltd | Manchester | A rating |
| Sismep Ltd | Greenford | A rating |
| SISO TECHNOLOGIES (UK) LIMITED | london | A rating |
| SISSONS CONVENIENCE STORES | LEEDS | A rating |
| Sistema Ecodeco UK | Milton Keynes | A rating |
| Sistema Scotland | Stirling | A rating |
| Sisteme Technologies Limited | Sheffield | A rating |
| SISTEMIM LTD | London | A rating |
| Sister | London | A rating |
| Sister Care Services CIC | Birmingham | A rating |
| Sister Jane UK Ltd. | London | A rating |
| Sisters Grimm Limited | London | A rating |
| SISTERS GRIMM LTD | LONDON | A rating |
| Sisters Hospitallers of the Sacred Heart of Jesus CIO | London | A rating |
| Sisters Limited | London | A rating |
| Sisters of Charity of Our Lady of Good & Perpetual Succour | Consett | A rating |
| Sisters of Charity of St. Paul the Apostle | Birmingham | A rating |
| Sisters of Nazareth | London | A rating |
| Sisters of St Joseph of Annecy CIO | Newport | A rating |
| Sisters of St Joseph of the Apparition CIO | BOWDON | A rating |
| Sisters of St Paul de Chartres | London | A rating |
| Sisters of the Divine Saviour CIO | BRISTOL | A rating |
| Sisters of the Holy Family of Bordeaux | London | A rating |
| Sisters of the Sacred Hearts of Jesus and Mary CIO | Woodford Bridge | A rating |
| Sisua Ltd | Wimbledon | A rating |
| SITA Advanced Travel Solutions Ltd | Reading | A rating |
| Sita Devi Ltd | Glasgow | A rating |
| SITA Information Networking Computing UK Ltd | Hayes | A rating |
| SITAL DISTRIBUTION LTD | Slough, Berkshire | A rating |
| Sital Petroleum Ltd t/a Shell | Bolton | A rating |
| Sitala Bio Ltd | Cambridge | A rating |
| Sitana Studios Ltd | Bristol | A rating |
| SITCON CONSULTING SERVICES PRIVATE LIMITED | Slough, | A rating |
| Site and Field UK Limited | London | A rating |
| Site Engineering Surveys Ltd | London | A rating |
| SITE FIX SOLUTION LTD | Slough | A rating |
| Site Safe International Ltd | Harrow | A rating |
| Site Sealants LTD | Airth | A rating |
| Site-Equip LTD | Alton | A rating |
| Sitecore UK Ltd. | London | A rating |
| Siteform Flooring Contractors Ltd | Dukinfield | A rating |
| Sitehop Ltd | Sheffield | A rating |
| Siteimprove Limited | London | A rating |
| Sitekit Systems Limited | Edinburgh | A rating |
| Sitemark Limited | Hanley Swan | A rating |
| Sitemate Services UK Limited | London | A rating |
| SiteMinder Distribution Limited | Birmingham | A rating |
| Sitetracker UK Limited | London | A rating |
| SITHAMPARAM THIEVENTHIRAM T/A Derby Local Supermarket | Derby | A rating |
| SITHAMPARAPILLAI PARAMASIVAM T/AS WISLEY WAY NEWS | Birmingham | A rating |
| SITHAMPARAPILLANI RANJAN AND REVATHY RANJAN T/A CASINO FILLING STATION | WINGHAM | A rating |
| SITPANAI ENTERPRISE LTD | Northolt | A rating |
| Sitruna Consulting Ltd | London | A rating |
| Sitryx Therapeutics Limited | Oxford | A rating |
| Sittampalam Kathiravel T/A Costles Food & Wine | London | A rating |
| SITTINGBOURNE ISLAMIC CULTURAL CENTRE | KENT | A rating |
| SITTINGBOURNE SERVICES LIMITED | Sittingbourne | A rating |
| Sittingbourne Visionplus Limited T/A Specsavers Opticians | Sittingbourne | A rating |
| Situation UK Limited | London | A rating |
| Situs Asset Management Ltd | London | A rating |
| SIV DORSET LTD | Bournemouth | A rating |
| SIVA 5 & SONS LTD | Whitfield | A rating |
| Siva And Sons Ltd | Cullompton | A rating |
| SIVA LTD | Whyteleafe | A rating |
| SIVA MUTHUMARIAMMAN TEMPLE LIMITED | Coventry | A rating |
| SIVA PLASTICS LIMITED | SOUTHAMPTON | A rating |
| Siva Retail Ltd | Cullompton | A rating |
| Siva Yogan & Co Ltd | Twickenham | A rating |
| Sivagnanasundararajah Muralisujeeva and Sujitha Muralisujeeva TA Modz Supermarket | London | A rating |
| SIVAGNANAUNDARAM SIVAKUMAR T/A VKDS ENTERPRISE NISA LOCAL | Birmingham, | A rating |
| Sivak Accountancy Ltd | Harrow | A rating |
| Sivakala Premakumar t/a Bargain Food & Wine | Twickenham | A rating |
| Sivalingham Bakeetharan T/A ADDINGTON SUPERSTORE | Ramsgate | A rating |
| Sivalis Group Ltd | Steyning | A rating |
| Sivamshun Retail Limited | Bristol | A rating |
| Sivan Services Ltd | Feering | A rating |
| Sivan Shakthi Services Ltd | Norwich | A rating |
| Sivananda Yoga Vedanta Centre | London | A rating |
| Sivanandan Ampalam t/a Shop Locally | Pensnett | A rating |
| Sivapalan & Co Ltd | Cardiff | A rating |
| SIVAPIRIYA DAVIDSRIPALA T/A COPTHORNE VILLAGE STORE | CRAWLEY | A rating |
| SIVAPRASADAM ENGINEERING LIMITED | Reading | A rating |
| Sivaraj Ltd | Gorleston On Sea | A rating |
| SIVARANJINY RASIAH T/A LONDIS | London | A rating |
| SIVAS FOOD LIMITED | Daventry | A rating |
| SIVAS TRADING GB LTD T/A ABI CONVENIENCE STORE PREMIER | Portsmouth | A rating |
| SIVASHAKTHI LTD | Norwich | A rating |
| SIVASUBRAMANIAM SUGANTHAN T/A Thurston Post Office and Londis Stores | Bury St Edmunds | A rating |
| SIVATHASAN KULASINGATHARMARASA T/A NISA LOCAL | Kempston | A rating |
| Sivaya Limited | Blackpool | A rating |
| Sivayogam | Croydon | A rating |
| Sivers Photonics Limited | Blantyre | A rating |
| Six & Flow Ltd | Manchester | A rating |
| Six Cheers Ltd trading as The Bedford | London | A rating |
| SIX COMMERCIAL CLEANING LIMITED | Middlesbrough | A rating |
| Six Continents Limited | Windsor | A rating |
| SIX DEGREES HOLDINGS LIMITED | LONDON | A rating |
| Six Degrees Labs | Farnham | A rating |
| SIX Financial Information UK Ltd | London | A rating |
| Six Italian Food Ltd trading as L'Antica Pizzeria Da Michele | London | A rating |
| Six Physio Ltd | London | A rating |
| Six Stars Events Ltd | London | A rating |
| Six Stories Limited | Altrincham | A rating |
| Six to Ten Stores | Essex | A rating |
| six to ten superstore ltd | Leicester | A rating |
| Six Ways Birmingham Limited | Birmingham | A rating |