What’s News in Markets: Walmart Slumps, Omnicom Rallies, Moderna Comeback

Why did Walmart fall on strong earnings? And how are Omnicom’s big cost cuts boosting its stock? Plus, will a major FDA reversal change Moderna’s fortunes? Host Jack Pitcher discusses the biggest stock moves of the week and the news that drove them.Sign up for the WSJ's free Markets A.M. newsletter.