Certified
| Amagi | Sell Side Support |
| Audience Store | Buyer Activation |
| Auto Trader | Direct Seller |
| Bauer Media | Direct Seller |
| Captify | Buy Side Support |
| COOL Media | TV+ |
| December 19 | Buyer Planner |
| Encore Digital Media | Buyer Activation |
| EssenceMediacom | Buyer Planner |
| Fifty | Buyer Activation |
| Footballco | Direct Seller |
| Global | Direct Seller, Sell Side Support |
| GumGum | Sell Side Support |
| Havas | Buyer Activation, Buyer Planner |
| Index Exchange | Sell Side Support |
| Direct Seller | |
| Immediate Media | Direct Seller |
| IPG Mediabrands | Buyer Activation, Buyer Planner |
| Jack Ryan | Buyer Planner |
| LADbible group | Direct Seller (Owned Inventory) |
| LoopMe | Buy Side Support (Tech Platform Services) |
| Mail Metro Media | Direct Seller |
| Meta | Direct Seller |
| Mindshare | Buyer Planner |
| MIQ | Buyer Activation |
| Mobsta | Buyer Activation |
| Moloco | Buy Side Support |
| News Uk | Direct Seller |
| Nexxen | Full Service Support |
| OCM Digital Media | Sell Side Support |
| Omnicom Media Group | Buyer Activation, Buyer Planner |
| Paramount Home Entertainment UK | TV+ |
| Publicis | Buyer Activation, Buyer Planner |
| Pubmatic | Sell Side Support |
| Quantcast | Buyer Activation |
| Rakuten | TV+ |
| Sabio | TV+ |
| Skyrise | Buyer Activation |
| Sky | Direct Seller (Owned Inventory) |
| T&P | Buyer Planner |
| Teads | Sell Side Support (Non-Owned Inventory) |
| The Guardian | Direct Seller |
| The Independent | Direct Seller |
| The Standard | Direct Seller |
| The Telegraph | Direct Seller |
| TikTok | Direct Seller |
| Triplelift | Sell Side Support (Non-Owned Inventory) |
| Venatus | Sell Side Support |
| Vevo | Direct Seller (Owned Inventory) |
| Wavemaker | Buyer Planner |
| WPP Media | Buyer Activation, Buyer Planner |
| WPP Media Nexus | Buyer Activation |
| Yahoo | Direct Seller |
Registered
| Blis | Buy Side Support |
| Crimtan | Buy Side Support (Tech Platform Services) |
| Dentsu | Buyer Planner |
| Focus Agency Group | Buyer Planner |
| Haymarket Media Group (Campaign) | Direct Seller (Owned Inventory) |
| InMobi | Sell Side Support, Buy Side Support |
| Livescore | Direct Seller (Owned Inventory) |
| Nano Interactive | Buyer Activation |
| Octave Audio | Direct Seller (Owned Inventory) |
| OneTag | Sell Side Support |
| Onyx by Outbrain | Full Service Support |
| Readpeak | Buy Side Support (Tech Platform Services) |
| Reach Solutions | Direct Seller (Owned Inventory) |
| ShowHeroes | Buy Side Support (Tech Platform Services) |
| SmartFrame | Sell Side Support (Non-Owned Inventory) |
| Taboola | Full Service Support |
| The Media People | Buyer Planner |
| Time Out | Direct Seller |
| TripAdvisor | Direct Seller (Owned Inventory) |
| WeAre8 | Direct Seller (Owned Inventory) |