In the 2011 failure, a climate satellite fell into the Pacific shortly after lifting off.
Shares of Orbital Sciences Corp. dropped $4.35, or 14.3 percent, to $26.02 in early trading on the New York Stock Exchange on Wednesday.
Crews searched for scorched wreckage along the Virginia coast Wednesday in hopes of determining why an unmanned commercial rocket exploded in a blow to NASA's strategy of using private companies to send supplies and, eventually, astronauts to the International Space Station.
The 140-foot (42.6-meter) Antares rocket, operated by Orbital Sciences Corp., blew up 15 seconds after liftoff Tuesday, lighting up the night sky and raining flaming debris on the launch site. No one was injured, but the $200 million-plus mission was a total loss.