Slowing digital-ad growth could force change on Google

While Google has dominated the online ad market for almost the entirety of its existence, its first quarter earnings report suggests that competitors may be nipping at its heels.

Investors pushed down the stock of Google’s parent company, Alphabet, more than 7% in after-hours trading Monday after it reported revenue that fell short of analyst expectations. That dip could shave more than $65 billion from Alphabet’s market value if it holds when the markets open Tuesday.