Why Altimmune Was Such a Robustly Healthy Stock on Thursday

Altimmune (ALT 3.54%) had some encouraging news to share with the world as the trading week drew near a close on Thursday. The biotech announced that it will soon ascend to an important, specialized stock index; investors greeted this news by trading the company's stock up by more than 3% on the day. This provided quite a marked contrast to the general trend for stocks, as the S&P 500 index dipped marginally across the session.Inclusion in an industry indexBefore market open, Altimmune divulged that it is b ...