Check out which companies are making headlines after the bell Tuesday:
Tekmira Pharmaceuticals - The Canadian biotech that developed a promising drug to treat Ebola surged in after-hours trading after the Centers for Disease Control and Prevention confirmed the first case of the disease had been diagnosed in the United States.
American Science & Engineering - The developer of X-ray inspection and other detection products fell in after-hours trading after it said it would cut its workforce by about 10 percent as it anticipates a net loss in the second quarter of fiscal 2015.
D.R. Horton - The builder edged lower after saying CEO Donald Tomnitz would retire, effective Wednesday, and be replaced by Chief Operating Officer David Auld.
EBay - The online-auction site extended gains in after-hours trading after saying it would split from PayPal, its payments unit, early in 2015.