Moderna to join S&P 500, shares jump after hours

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Moderna shares rose 6% in extended trade after the announcement. The COVID-19 vaccine maker’s stock has surged over 150% this year, elevating its market capitalization to about $100 billion.

Britain’s AstraZeneca (NASDAQ:AZN) said last December it would acquire U.S. biotech Alexion in a $39 billion deal.