| Company name | Company type(s) | Gold Standard Status |
| Acast | Buy Side Support | Registered |
| Activision Blizzard Media | Direct Sellers (owned inventory) |
Certified |
| Adform | Sell Side Support (non-owned inventory) Buy Side Support (Tech platform services) |
Certified |
| Admaxim | Buy Side Support | Certified |
| AutoTrader | Direct Sellers (owned inventory) | Certified |
| Amazon Advertising | Buy Side Support (Tech platform services) Buyer Planner |
Certified |
| Amagi | Sell Side Support | Registered |
| Audience Store | Buyer Activation | Certified |
| AudienceQ | Full Service Support | Registered |
| Authorised Buyers, Google | Buy Side Support (Tech platform services) | Certified |
| Azerion | Direct Sellers (owned inventory) Sell Side Support (non-owned inventory) |
Registered |
| Bauer Media | Direct Sellers (owned inventory) | Certified |
| Bidstack | Sell Side Support (non-owned inventory) | Certified |
| Blis | Buy Side Support (Tech platform services) | Certified |
| Captify | Buyer Activation | Certified |
| Crimtan | Buy Side Support (Tech platform services) | Certified |
| Dentsu | Buyer Planner | Registered |
| Digital Turbine | Sell Side Support (non-owned inventory) | Certified |
| Discovery Networks | Direct Sellers (owned inventory) | Certified |
| encore | Buyer Activation Buyer Planner |
Certified |
| EntityX | Sell Side Support | Registered |
| Equativ | Buy Side Support (Tech platform services) | Registered |
| ESI Media | Direct Sellers (owned inventory) | Certified |
| Essence | Buyer Planner | Certified |
| Exit Bee | Full Service Support | Certified |
| Fifty | Buy Side Support (Tech platform services) | Certified |
| Finecast | Buyer Activation | Certified |
| Footballco | Direct Sellers (owned inventory) | Certified |
| FreeWheel | Sell Side Support (non-owned inventory) | Certified |
| Global | Direct Sellers & Sell Side Support (owned inventory) | Certified |
| GroupM PBU | Buyer Activation | Certified |
| GroupM UK | Buyer Planner | Certified |
| GumGum | Sell Side Support (non-owned inventory) | Certified |
| Havas | Buyer Activation, Buyer Planner | Certified |
| Hearst | Direct Sellers (owned inventory) | Certified |
| Hello! | Direct Sellers (owned inventory) | Certified |
| Immediate Media | Direct Sellers (owned inventory) | Certified |
| Index Exchange | Sell Side Support (non-owned inventory) | Certified |
| Inskin | Sell Side Support (non-owned inventory) | Certified |
| Direct Sellers (owned inventory) | Certified | |
| IPGMediabrands | Buyer Planner | Certified |
| JACK RYAN Media | Buyer Planner | Registered |
| JustPremium | Sell Side Support (non-owned inventory) | Certified |
| LADbible group | Direct Sellers (owned inventory) | Certified |
| LiveScore | Direct Sellers (owned inventory) | Certified |
| LoopMe | Buy Side Support (Tech platform services) | Certified |
| MatterKind | Buyer Activation | Certified |
| m/Six | Buyer Planner | Certified |
| Magnite | Sell Side Support (non-owned inventory) | Certified |
| MailMetroMedia | Direct Sellers (owned inventory) | Certified |
| Mediacom | Buyer Planner | Certified |
| MediaCom North | Buyer Planner | Certified |
| Meta | Direct Sellers (owned inventory) | Certified |
| Mindshare | Buyer Planner | Certified |
| MIQ | Buyer Activation | Certified |
| Mobsta | Buyer Activation | Certified |
| Moloco | Buy Side Support (Tech platform services) | Certified |
| Nano Interactive | Buyer Activation | Certified |
| NBC Universal | Direct Sellers (owned inventory) | Registered |
| News UK | Direct Sellers (owned inventory) | Certified |
| Nexxen | Full Service Support | Certified |
| OCM Digital Media | Sell Side Support (non-owned inventory) | Registered |
| Octave Audio | Direct Sellers (owned inventory) | Certified |
| Omnicom Media Group | Buyer Activation Buyer Planner |
Certified |
| OpenX | Buy Side Support (Tech platform services) | Certified |
| Playground XYZ | Sell Side Support (non-owned inventory) | Certified |
| Publicis Media | Buyer Activation Buyer Planner |
Certified |
| Pubmatic | Sell Side Support (Tech platform services) | Certified |
| Quantcast | Buyer Activation | Certified |
| Reach Solutions | Direct Sellers (owned inventory) | Certified |
| Rezonence | Sell Side Support (non-owned inventory) | Certified |
| Seedtag | Sell Side Support (non-owned inventory) | Certified |
| Showheroes | Buy Side Support | Registered |
| Sky | Direct Sellers (owned inventory) | Certified |
| Skyrise Intelligence | Buyer Activation | Registered |
| SmartFrame | Sell Side Support (non-owned inventory) | Certified |
| Sovrn | Sell Side Support (non-owned inventory) | Certified |
| Taboola | Full Service Support | Certified |
| Teads | Sell Side Support (non-owned inventory) | Certified |
| The Guardian | Direct Sellers (owned inventory) | Certified |
| The Telegraph | Direct Sellers (owned inventory) | Certified |
| the7Stars | Buyer Activation Buyer Planner |
Certified |
| TheTradeDesk | Buy Side Support (Tech platform services) | Certified |
| TikTok | Direct Sellers (owned inventory) | Certified |
| Time Out Media | Direct Sellers (owned inventory) | Registered |
| TripAdvisor | Direct Sellers (owned inventory) | Certified |
| triplelift | Sell Side Support (non-owned inventory) | Certified |
| vdx.tv | Full Service Support | Certified |
| venatus | Sell Side Support (non-owned inventory) | Certified |
| Vevo | Direct Sellers (owned inventory) | Certified |
| Wavemaker | Buyer Planner | Certified |
| WeAre8 | Direct Sellers (owned inventory) | Certified |
| Wunderkind | Sell Side Support (non-owned inventory) | Registered |
| Xandr | Sell Side Support (non-owned inventory) Buy Side Support (Tech platform services) |
Certified |
| Xaxis UK | Buyer Activation | Certified |
| Yahoo | Direct Sellers (owned inventory) Sell Side Support (non-owned inventory) Buy Side Support (Tech platform services) |
Certified |
| YouTube, Google | Direct Sellers (owned inventory) | Certified |