| Seacliff Care Home | Bournemouth | A rating |
| Seacliff Douglas Ltd T/As The Jamaica Inn; | Bangor | A rating |
| Seaco Global Ltd | London | A rating |
| Seacom Services (Accountancy) Ltd | Farnborough | A rating |
| Seacrest Care Services Ltd | Harlow | A rating |
| Seacross Pharmaceuticals Limited | London | A rating |
| Seadown Veterinary Services Ltd | Hythe, Southampton | A rating |
| Seadrill Management Ltd | Liverpool | A rating |
| Seafai UK Ltd. | Glasgow | A rating |
| SEAFARERS LOGISTICS GB LTD | London | A rating |
| Seafield Arms Hotel ( Cullen )Ltd | Cullen | A rating |
| SEAFIRST MARINE SERVICE UK LIMITED | London | A rating |
| Seafood and Eat It | Hounslow | A rating |
| Seafood Centre Leicester Ltd | Leicester | A rating |
| SEAFOOD CENTRE LTD | Leicester | A rating |
| SEAFOOD CHOICE LONDON LIMITED | LONDON | A rating |
| Seafood Ecosse Limited | Aberdeen | A rating |
| Seafood Scotland | Newbridge | A rating |
| Seaford Care Ltd T/A Seaford Head Retirement Home | East Sussex | A rating |
| Seaford Homes Ltd T/A Nova House Care Home | Seaford | A rating |
| Seaford Medical Practice | SEAFORD | A rating |
| Seaford Visionplus Ltd T/A Specsavers Opticians | Seaford | A rating |
| Seaforth Land Holdings Limited | London | A rating |
| Seaforth Store | New Malden | A rating |
| SEAFRIGO UK LIMITED | EAST TILBURY | A rating |
| Seagard | Edinburgh | A rating |
| Seagate Technology (Ireland) | Londonderry | A rating |
| Seagry Care Limited | West Sussex | A rating |
| Seagull Freight Services Ltd | Hornchurch | A rating |
| Seagull Maritime Agencies Private Limited | Reading | A rating |
| SEAH WIND LTD | Middlesbrough, | A rating |
| SEAHAM CARE LIMITED | Isle Of Man, | A rating |
| Seaham Harbour Cricket Club | Seaham | A rating |
| SEAHAM HIGH SCHOOL | SEAHAM | A rating |
| Seaham Park CC | Seaham. | A rating |
| Seaham Vets | Seaham | A rating |
| Seahawk Marine Foods Ltd | London | A rating |
| Seahorse (Park House) Ltd | London | A rating |
| Seahorse Nursery | London | A rating |
| Seal Dynamics Ltd | Basingstoke | A rating |
| SEAL IT SERVICES LIMITED | Elland | A rating |
| Sealand Projects Limited | Aberdeen | A rating |
| SEALARUEL LIMITED | London | A rating |
| Sealip Engineering Limited | Rochdale | A rating |
| SEALPAC UK LIMITED | Poole | A rating |
| SEAM Design Ltd | London | A rating |
| Seamab | Rumbling Bridge | A rating |
| Seamach Ltd | Axminster | A rating |
| Seamariner Limited | Southampton | A rating |
| Seamark Group Limited | Manchester | A rating |
| Seamflow Ltd | Cheshire | A rating |
| Seamless 24/7 Ltd | Solihull | A rating |
| Sean J Jordan Engineering Ltd | Dungannon | A rating |
| Sean Murphy Dental Care | Edinburgh | A rating |
| SEAN NUGENT ENGINEERING LIMITED | Dungannon | A rating |
| Sean Nugent Engineering Ltd | Dungannon | A rating |
| Seapeak Maritime (Glasgow) Limited | Glasgow | A rating |
| Seapony Limited | London | A rating |
| Searah Limited | London | A rating |
| SEARCE LIMITED | London | A rating |
| SEARCH EducationTrust | London | A rating |
| Search Intelligence Ltd | Witney | A rating |
| Search Newcastle | Newcastle Upon Tyne | A rating |
| Searchable Ltd | London | A rating |
| Searchland LTD | London | A rating |
| Searchlight Capital Partners UK LLP | London | A rating |
| Searchlight Cyber Ltd | Portsmouth | A rating |
| Searchpilot Limited | London | A rating |
| Searcys Tansley & Co Ltd | Earley, Reading | A rating |
| Searo Labs Ltd | Cambridge | A rating |
| Sears Healthcare Ltd | Newbury | A rating |
| Sears Manufacturing Company (Europe) Ltd | Ebbw Vale | A rating |
| SeaSalt Bistro | Port Ellen | A rating |
| Seascale Pharmacy Ltd | Seascale | A rating |
| SEASHELL BEAUTY LTD T/a Seashell Nails & Beauty Supply | London | A rating |
| Seashell Trust | Stockport | A rating |
| SEASHORE ENTERPRISES (PORTHCAWL) LTD | PORTHCAWL | A rating |
| seashore trade services ltd | cambridge | A rating |
| SEASIDE CHIPPY LTD | Blackpool | A rating |
| Seaside Dental Practice Limited | Eastbourne | A rating |
| Seaside Medical Centre | Eastbourne | A rating |
| Season 25 Limited | London | A rating |
| Season Fruit And Veg Ltd | Uxbridge | A rating |
| Season Harvest NI Ltd | Claudy | A rating |
| Seasons Care Ltd | Walsall | A rating |
| Seasons of India Restaurant Limited T/a Ritu | St John's Wood | A rating |
| Seaspace International Forwarders Limited | Widnes | A rating |
| SEASTAR MARITIME LIMITED | London | A rating |
| Seastar Production Limited | London | A rating |
| Seaswift House | Seaton | A rating |
| Seatankers Services (UK) LLP | London | A rating |
| Seatec International Ltd | London | A rating |
| Seatfrog Ops Limited | London | A rating |
| SeatGeek Sport Limited | Manchester | A rating |
| Seathor Limited | Littleborough | A rating |
| SEATING MASTER LIMITED | London | A rating |
| SEATON HEALTHCARE LIMITED | Blyth | A rating |
| Seattle Software t/a Orbus Software | London | A rating |
| Seaview Dental Practice | Poole | A rating |
| Seaview House Care Limited | Clacton on sea | A rating |
| SEAVIEW HOUSE PRIVATE NURSING HOME | Bangor | A rating |
| SEAVIEW RESIDENTIAL HOME LIMITED | Sothsea | A rating |
| Seaview Restaurant Ltd | Tenby | A rating |
| SEB | London | A rating |
| Seb Steel Ltd | Essex | A rating |
| Seba Trade Ltd | Witney | A rating |
| SEBASTIAN AND DAUGHTERS LTD | Hownslow | A rating |
| sebia uk | camberley | A rating |
| SEBOTT SOLUTIONS LIMITED | LONDON | A rating |
| SEBPHARM LIMITED | WAKEFIELD | A rating |
| SEC Recruitment Limited | London | A rating |
| Secaplus Limited | Basildon | A rating |
| SeCareServe LTD | Shrivenham | A rating |
| Secarma Ltd | Manchester | A rating |
| Secaudi Limited | Birmingham | A rating |
| Secchi Smith Limited | London | A rating |
| SECCTA Limited | Horseshoe Hill, Upshire | A rating |
| SECCURO SECURITY SERVICES LTD | Birmingham | A rating |
| SECEN LONDON LTD | London | A rating |
| Secforce | London | A rating |
| Seco Support Limited | Plymouth | A rating |
| Secom Plc | Surrey | A rating |
| Secomak Ltd | Elstree | A rating |
| Secon Cyber Security Ltd | London | A rating |
| Second Act Ltd T/A Syani and T/A Jashns | London | A rating |
| Second City Housing | Birmingham | A rating |
| SECOND CITY HOUSING PROPERTIES LTD | Birmingham | A rating |
| Second Front Systems Limited | Maidenhead | A rating |
| SECOND HALF PRODUCTIONS | LONDON | A rating |
| Second Impact Games | Brighton | A rating |
| Second Management Consultancy Ltd | Southend-on-Sea | A rating |
| Second Nature Healthy Habits Ltd | London | A rating |
| SECOND NATURE LIMITED | LONDON | A rating |
| Second Skin Pty Ltd | London | A rating |
| Second Star Games Limited | Warrington | A rating |
| Second State Pizza Company Ltd | Camberley | A rating |
| Second Street Surgery | Gateshead | A rating |
| Second To None Care | Durham | A rating |
| Secondmind Ltd | Cambridge | A rating |
| SECOSTA LTD | London | A rating |
| SECQAI LTD | London | A rating |
| Secret Escapes LTD | London | A rating |
| Secret of Indian Masala Ltd | Harrow | A rating |
| Secret Potions Limited | STOKE ON TRENT | A rating |
| SECRET SKY CAFE LIMITED | Leeds | A rating |
| Secret World Wildlife Rescue | Highbridge | A rating |
| Secretariat Partners UK LLP | London | A rating |
| Secretcape Ltd | London | A rating |
| SECRETLONDON LTD | LONDON | A rating |
| SECRETPA LTD | London | A rating |
| SECT.RIVER LTD T/A Coogate Convenience Store | Edinburgh | A rating |
| Sector & Segment Group Ltd | St Albans | A rating |
| Sector Global Ltd | Clevedon | A rating |
| Sectorlight Marketing Limited | London | A rating |
| Sectra Ltd | Stevenage | A rating |
| Secure Accommodation Ltd | Nottingham | A rating |
| Secure Box Services Limited | Southend-on-Sea | A rating |
| Secure Build Limited T/A Himalaya Tiles and Bathroom | Coventry | A rating |
| SECURE CARE LONDON LTD | Essex | A rating |
| Secure Code Warrior Limited | Northampton | A rating |
| Secure FM Ltd | Bolton | A rating |
| Secure Future Consultants Ltd | Uxbridge | A rating |
| SECURE FUTURE RESEARCH LTD | London | A rating |
| SECURE GUARD LONDON LTD | Waltham Abbey | A rating |
| secure healthcare Limited | wolverhampton | A rating |
| Secure Innovation Ltd | Saltash | A rating |
| Secure Line Electrical Limited | Dudley | A rating |
| Secure Living Limited t/a USB2U | Northampton | A rating |
| Secure Logiq Ltd | Crawley | A rating |
| SECURE MANAGEMENT SECURITY GROUP LIMITED | Harborough District, Leicester | A rating |
| Secure Meters (UK) Ltd | Chandlers Ford | A rating |
| Secure My World Ltd | Bolton | A rating |
| Secure Parking Solutions Limited | Birmingham | A rating |
| Secure Risk Management Limited | Birmingham | A rating |
| Secure Schools Ltd | Newmarket | A rating |
| Secure Security and Services Ltd | Leicester | A rating |
| SECURE SECURITY GUARDS LIMITED | Barking | A rating |
| SECURE SECURITY GUARDS SERVICES LTD | Ilford | A rating |
| Secure Sensor Innovative Design Ltd | Bridgend | A rating |
| SECURE SUBS LIMITED | Sutton Coldfield | A rating |
| SECURE TECHNOLOGIES LTD | ST NEOTS | A rating |
| Secure Technology Solutions Limited | Gravesend | A rating |
| Secure Thingz Ltd trading as Iar | Cambridge | A rating |
| Secure Town Limited | Birmingham | A rating |
| SECURE TRADE LIMITED | WEMBLEY | A rating |
| Secure-Ops Events Ltd | Stanstead Abbots | A rating |
| SECURE-P K9 LTD | Dagenham | A rating |
| SecureCare (UK) Limited | London | A rating |
| SECURED ASSET SERVICES LIMITED | London | A rating |
| Secured Lets Ltd | Staines | A rating |
| Secureend Ltd t/a DNS Sense | HIGH WYCOMBE | A rating |
| Secureflag Limited | London | A rating |
| Secureit Services (MCR) LTD | Bolton | A rating |
| SECURELEX LTD | Walsall | A rating |
| SecurEnvoy Limited | Basingstoke | A rating |
| SecureTeam Ltd | London | A rating |
| Securewais UK Ltd | London | A rating |
| SECUREWAY TRAINING LTD | Birmingham | A rating |
| SECUREX PREMIUM SERVICES LTD | London | A rating |
| SECURI NETWORK LIMITED | Bolton | A rating |