SAN FRANCISCO — Whereas Google has dominated the web advert marketplace for virtually the whole thing of its existence, its first quarter earnings report means that rivals could also be nipping at its heels.

Buyers pushed down the inventory of Google’s father or mother firm, Alphabet, greater than 7% in after-hours buying and selling Monday after it reported income that fell in need of analyst expectations. That dip may shave greater than $65 billion from Alphabet’s market worth if it holds when the markets open Tuesday.

Google’s promoting income, its key moneymaker, grew by 15 p.c to $30.7 billion — slower than buyers had hoped. Its digital-ad rivals Fb and Amazon, in the meantime, each reported sturdy earnings final week, including to the investor shock when Alphabet stumbled regardless of a powerful economic system.

Alphabet executives deflected issues of rising competitors on a convention name with analysts Monday, as a substitute suggesting that fluctuating forex charges and modifications to Google advert merchandise through the quarter led to the slowdown. The net-ad trade can also be nonetheless in a yearslong shift to cellphone and pill advertisements and away from ones aimed toward desktop customers. Advertisements for cell gadgets herald much less cash.

Nonetheless, the outcomes sparked issues that Google’s enormously worthwhile promoting machine is perhaps beginning to sputter. Some analysts prompt it is a sign that Google may have to diversify its enterprise extra rapidly.

“Does this put extra stress on Google to make extra aggressive bets on cloud?” requested Wedbush Securities analyst Dan Ives.

Google executives highlighted the corporate’s cloud-computing enterprise as one in all its quickest rising segments through the Monday name. However the cloud presently accounts for less than a small slice of Alphabet’s total income. The corporate reported $5.Four billion in “different” income, which incorporates cloud, {hardware} and Play Retailer purchases.

{Hardware} gross sales additionally slowed through the quarter for the Pixel cellphone, Google chief monetary officer Ruth Porat mentioned on Monday’s name, reflecting a broader trade slowdown in smartphone gross sales.

Alphabet reported a first-quarter revenue of $8.Three billion, down 6% from $8.9 billion within the year-earlier interval. Revenue amounted to $11.90 per share, effectively above Wall Road estimates of $10.60.

That determine would not embody an anticipated cost of $1.7 billion to account for a European Union antitrust nice. The nice was imposed in March for anti-competitive practices in Google’s promoting enterprise, referring to a selected exclusivity observe Google now says it has ended.

Google and Fb, together with different web corporations, are feeling rising warmth from regulatory our bodies all over the world as individuals and governments query their privateness practices. Some regulators categorical concern that the biggest corporations are so massive that they are stifling competitors.

Together with the nice, Alphabet’s revenue of $6.7 billion fell in need of analyst estimates. Excluding promoting commissions that Google pays to prospects, Alphabet’s total income was $29.5 billion — additionally falling in need of the $30 billion analysts have been anticipating.

Alphabet additionally reported widening losses in its “Different Bets” class — a broad phase that features experimental ventures comparable to self-driving automobile enterprise Waymo and internet-balloon subsidiary Loon. Losses grew to $868 million from $571 million a yr in the past.