Alphabet Inc. reported a 21 percent jump in quarterly revenue Monday, maintaining a growth rate that is rarely seen among companies its size and suggesting the big sales gains enjoyed recently by the other internet firms are not done yet.

Alphabet, the owner of Google and YouTube, said it made $3.5 billion in net income on sales of $26 billion. The profit would have been much larger but for a record $2.7 billion European Union antitrust fine.

Still, the company noted that costs were rising faster than sales and warned that expenses would remain high as more searches shift to mobile devices.