In this picture, taken on May 21, 2021, test tubes are visible in front of a displayed Moderna logo. Illustration by REUTERS/Dado Ruvic 15 JULY (Reuters) – S&P Dow Jones Indices announced on Thursday that Moderna Inc (MRNA.O) will replace Alexion Pharmaceuticals (ALXN.O) in the S&P 500 index (.SPX) as of the start of trading on July 21. Following the announcement, Moderna’s stock surged 6% in extended trading. The stock of the COVID-19 vaccine producer has increased by more than 150 percent this year, bringing its market worth to almost $100 billion. AstraZeneca (AZN.L), a British pharmaceutical company, said in December that it will pay $39 billion for US biotech Alexion. find out more Noel Randewich contributed reporting, and Sandra Maler edited the piece. The Thomson Reuters Trust Principles are our standards./nRead More