Baystreet Staff - Tuesday, April 12, 2016 ADTRAN (ADTN) Slides Ahead of Earnings ADTRAN, Inc. (NASDAQ: ADTN) shares slumped 4.5% to $18.72. The company is expected to post quarterly earnings at $0.08 per share on revenue of $141.07 million. Share volume proved 111,000, compared to an all-day average of 579,000