Why Emergent BioSciences Stock Plummeted Today

Emergent BioSolutions (EBS -5.59%) saw its shares tumble on Tuesday, due to news of a share sell-off. The vaccine maker divulged in a regulatory filing that several institutional share and warrant holders are selling such securities. Investors reacted by trading Emergent's stock down by almost 6%, on a day when the S&P 500 (^GSPC 0.05%) more or less flatlined.Unloading shares and exercising warrantsThe selling parties are mainly entities affiliated with OHA Agency, a business that provided a $250 million te ...