Oak Street Health ($OSH@US) rose 36 percent after Bloomberg reported that CVS ($CVS@US) is looking at options to purchase the healthcare company for $10 billion. CureVac ($CVAC@Germany) shares rose 19 percent after the company said it plans further patient trials of its mRNA vaccines for Covid-19 and the flu. Boeing ($BA@US) dropped 2 percent in premarket trading after Morgan Stanley ($MS@US) downgraded it to equal weight. Frontline’s ($FRO@South Korea) stock rose 24 percent premarket after the oil tanker shipping company announced that it was terminating its combination with Euronav ($EURN@Belgium).