The four companies will join AOL, DigitasLBi, Facebook, Global, JCDecaux, Mail Advertising, Twitter, and YouTube to showcase their latest innovations within the digital advertising space at what is set to be the largest Digital Upfronts to date.
Taking place from 29 September to 6 October, the event will see the 14 partners host events across central London.
For the second year running, Campaign will be the exclusive media partner of the Digital Upfronts.
"Digital Upfronts creates a unique opportunity by putting a date in the diary for a week of exciting and future-facing presentations," Jon Mew, chief executive at IAB UK said. "This event is really about the advertising community coming together to celebrate the new, with media owners debuting their latest product innovations for advertisers and agencies."
Events will be available for registration in the coming weeks and all events are free to attend.
For the latest information, including schedules and venues, visit iabuk.net/upfronts.