| 3000 YEARS MUSIC PUBLISHING LIMITED | RISLEY | A rating |
| 360 Brand Group Limited | Heywood | A rating |
| 360 DIGI MARKETING LTD | London | A rating |
| 360 DIGI MARKETING LTD | Canary Wharf | A rating |
| 408 Media Group Ltd | Sandbach | A rating |
| 75 Media Limited | Leeds | A rating |
| A ONE STAR MARKETING LIMITED | Southall | A rating |
| AAAA Communications Limited t/a Media Guru | London | A rating |
| Aalto Media Limited t/a Aalto Production | London | A rating |
| Absolute Results Sales and Marketing Ltd. | Watford | A rating |
| Accent Marketing and Research Limited | London | A rating |
| Accenture Song Brand UK Limited | London | A rating |
| Account Media Limited | London | A rating |
| Acoustic Marketing UK Ltd | London | A rating |
| Advance International Media Ltd | London | A rating |
| ADVANCE MARKETING (PVT) LTD | Manchester | A rating |
| Advance Media Ltd | London | A rating |
| Adverto Media Ltd | Gloucester | A rating |
| Aeron Branding Limited | London | A rating |
| Affect Media Limited | Stockpor | A rating |
| AGAR IRONMONGERY DESIGN & MARKETING CONSULTANCY LIMITED | London | A rating |
| AGENDA MEDIA LIMITED | MANCHESTER | A rating |
| Agent Marketing | Liverpool | A rating |
| AIM HIGHER MARKETING & CONSULTING LTD | SKIPTON | A rating |
| AIM MARKETING LTD | Birmingham | A rating |
| Airline Tariff Publishing Company (ATPCO) | London | A rating |
| AK Events & Media Ltd | Northampton | A rating |
| AKITA BRANDS LIMITED | London | A rating |
| Al Manar Books & Media Limited | London | A rating |
| Al-Jazeera Satellite Channel Limited | London | A rating |
| AL-QUDS AL-ARABI PUBLISHING AND ADVERTISING (OVERSEAS) LIMITED | London | A rating |
| Alain Charles Publishing Limited | London | A rating |
| Alastair Sawday Publishing Co. Ltd | Bristol | A rating |
| All City Media Limited | London | A rating |
| All Conditions Media Ltd | Hove | A rating |
| ALL CREATIVE BRANDING LIMITED | London | A rating |
| All Global Media Limited | London | A rating |
| All In One Marketing Ltd | St Albans | A rating |
| Alliance Advertising & Marketing Ltd | London | A rating |
| Alliance Media and Communications Limited | DARTFORD | A rating |
| Allied Global Marketing Ltd. | London | A rating |
| Alternate Reality Media LTD | Harrow | A rating |
| Amagi Media Private Limited | London | A rating |
| AME PUBLISHING LTD | London | UK Expansion Worker: Provisional |
| AMITY MEDIA (UK) LTD | London | A rating |
| AMORE MEDIA SYSTEMS LTD | Stourport-On-Severn | A rating |
| Anatomy Brands Ltd | London | A rating |
| Animoca Brands UK Limited | LONDON | A rating |
| Ants Advertising And Marketing Ltd | London | A rating |
| AO Brands International Limited | London | A rating |