It looks like tech stocks are suffering from a case of the Mondays.
Facebook, Twitter, Amazon and other tech stocks each declined by 2% or more by the end of trading Monday as investors shift away from so-called "momentum" tech stocks with high valuations.
There had been a broad selloff among tech stocks earlier this month, but there were signs of a rebound as earnings season got under way. The decline on Monday was a reminder of ongoing volatility in the tech sector.
There were, of course, more specific factors at play for some of these stocks. Amazon stock has declined on back-to-back trading days following its lukewarm earnings report Thursday, in which it projected a sizable operating loss in the upcoming quarter. Twitter is coming up on the end of a major stock lockup period.
Apple and Microsoft were two notable exceptions, increasing by nearly 4% and 2.5%, respectively, for the day.
Apple in particular is closing in on the $600 mark for the first time this year following a strong earnings report and news that it plans to boost its stock buyback by $30 billion.