Arthur Sadoun responded to the proposed mega-deal in a video to staff, a week after Snoop Dogg declared Publicis the world’s largest holding company.

Opportunistic rivals are likely to pounce for the best clients and talent. Workers are advised to brush up their skillsets in areas like AI and data.

Omnicom and IPG expect to make $750m (£587m) in “annual cost synergies”, and there was no immediate word on where the cuts may fall. The combined company is expected to have a stock market capitalisation of more than $30bn (£23bn).The deal is expected to close in the second half of 2025, the companies said.

Omnicom acquiring Interpublic Group to create global ad behemoth, impacting industry landscape with cost savings and client shake-ups.

A deal of this magnitude will have implications far beyond Omnicom and IPG. Agency heads tell us what they think of the motives – and what it means for them.

The deal of the decade redefines revenue dynamics, global markets, and service mix. Omnicom’s acquisition of Interpublic Group is on track to create the world’s largest agency group by total revenue, making a big splash this week after the proposed deal was kept mostly under wraps.

In today's newsletter, the $13 billion Omnicom-IPG megamerger reflects a new era as Big Tech and AI upend the ad industry. What's on deck: But first, a new ad-venture. If this was forwarded to you, sign up here.