Shares of health IT firm Cerner fell sharply after the bell after the company reported its quarterly earnings. The company guided investors to expect revenue in the range of $1.15 billion to $1.2 billion for the fiscal first quarter, at the lower end of the $1.19 billion expected by Wall Street, according to the Associated Press.
Comerica shares bounced after the company said it discovered irregularities in a single customer loan relationship. The financial services firm is revising its fourth quarter results after an investigation found there was "significant doubt" that a certain loan would be repaid, it said in a statement.
And shares of Rackspace sank in extended trading after the cloud computing company said it expects revenue in the range of $517 million to $521 million for the current quarter ending in April, below the $531.8 million expected by analysts surveyed by the Associated Press.
Rackspace has seen shares decline 28 percent so far this year as fellow software as a service companies like Tableau and Splunk were dinged in a turbulent earnings season.
— Reuters, AP, and CNBC's Alex Crippen contributed to this report.