| Byblos Bank Europe SA | LONDON | A rating |
| Bycity Limited | London | A rating |
| BYD (U.K.) CO.,LTD | Uxbridge | A rating |
| BYE PASS FILLING STATION | METHERINGHAM | A rating |
| BYERLEY TURK E-COMMERCE LOGISTICS LTD | Loughton | A rating |
| Byfield Consultancy Ltd | London | A rating |
| Byfords | Holt | A rating |
| BYK Additives Ltd | Widnes | A rating |
| Bykare Services Limited | Middlesbrough | A rating |
| BYL DIAMONDS UK LIMITED | London | A rating |
| Byland Engineering Limited | York | A rating |
| Bylor Services Limited | Crossways | A rating |
| Bynder Limited | London | A rating |
| Byngo Payments Ltd | London | A rating |
| Byoma Kusuma Buddhadharma Sangha | South Ruislip | A rating |
| BYOMA Limited | London | A rating |
| Byoot Construction Ltd | London | A rating |
| BYP Network Limited | London | A rating |
| Byrd Link Audit & Accountancy Services Limited | Cheltenham | A rating |
| byrd Technologies UK Ltd | London | A rating |
| Byrne Bros (Formwork) Ltd | London | A rating |
| Byrne Looby Partners (UK) Limited | Guildford | A rating |
| Byrom plc | Cheadle | A rating |
| Byron & Byron Ltd, | enfield | A rating |
| Byron Bakery Ltd | Ballater | A rating |
| Byron Lodge (West Melton) Ltd | Rotherham | A rating |
| Byron Lodge Care Home Ltd T/A Byron Lodge Nursing Home | Gillingham | A rating |
| Byron Medical Practice | Seaham | A rating |
| Byron Scaffolding Ltd | London | A rating |
| Byron Stores | Gillingham | A rating |
| Byron Stores Limited | Aberdeen | A rating |
| BYS Care & Training Services Limited | London | A rating |
| bysteel UK limited | London | A rating |
| Bystronic UK Ltd | Coventry | A rating |
| Byte Code Software Solutions Limited | Rainham | A rating |
| Bytes Software Services Limited | Leatherhead | A rating |
| ByteSnap Design Limited | Birmingham | A rating |
| BYTN Ltd | Gravesend | A rating |
| Byward London Limited | London | A rating |
| Bywater SFC Management Ltd t/a Bywater Properties | London | A rating |
| Bywaters (Leyton) Ltd | Bromley-By-Bow | A rating |
| Byway House Care Home | Bognor Regis | A rating |
| Bywood Dental Practice | Croydon | A rating |
| BZ FOR CARE LTD | London | A rating |
| BZK PIZZAWORKS LTD | Eastwood | A rating |
| BZQ Sons LTD | High Wycombe | A rating |