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A week after the broad correction, the board turned completely green: all six tracked marcom companies ended the week of 4 to 11 August higher.

The decision follows a competitive agency review and marks another significant shift in the increasingly active global media agency landscape.

Omnicom was the biggest decliner, falling more than 5% after disappointing second-quarter profitability.

Diluted earnings per share were $2.08, with Non-GAAP adjusted diluted earnings per share increasing 29 per cent to $2.65.

WPP posted the strongest performance with a gain of nearly 16%, followed by S4 Capital. Havas was the only company to record only marginal growth.

Provisional standings: LePub, TBWA, and Uncommon Creative Studio record the biggest gains

This week, Dentsu was the biggest gainer on the back of a series of account wins, while Omnicom came under pressure and Publicis declined despite raising its full-year outlook.

Omnicom's Board of Directors has declared a quarterly dividend of 80 cents per outstanding share of the company's common stock.

This week's developments are driven by a new round of layoffs at WPP, Havas winning the global media account for Candy Crush from Omnicom agency OMD, and Dentsu launching its own retail data infrastructure.

The biggest gains came from S4 Capital and WPP, up 14.3% and 13.6% respectively—two companies that have faced pressure over recent quarters.

The week's key developments included Adidas moving its global media business to Omnicom, the expansion of WPP Enterprise Solutions, a potential agency shift at Skechers, and reports that Dentsu plans to take its subsidiary Dentsu Soken private.

The solution, announced ahead of a presentation at Cannes Lions, is built on Acxiom's Real ID technology and aims to give marketers deeper insight into how sports fandom influences consumer behaviour and business performance.

A positive week for agency networks, with Publicis posting the biggest gain and S4 Capital the only decliner