Adtran (ADTN) Shares Cross Below 200 DMA By: Market News Video December 29, 2017 at 11:38 AM EST In trading on Friday, shares of Adtran, Inc. (ADTN) crossed below their 200 day moving average of $21.44, changing hands as low as $18.65 per share.. Read More >> Related Stocks: Adtran Holdings Inc