Check out which companies are making headlines after the bell Tuesday:
CalAmp - The wireless technology provider reported first-quarter adjusted earnings per share of 19 cents on $59 million in revenue. Analysts had expected earnings of 18 cents on $58 million in sales. But shares dropped in after-hours trading after the company projected second-quarter revenue beneath expectations.
General Motors - The auto manufacturer confirmed a chemical explosion Tuesday left one worker with life-threatening injuries at a metal stamping factory in Marion, Ind., according to the Associated Press. Shares of GM edged lower in after-hours trading.