Moderna (NASDAQ: MRNA) is now officially a member of the S&P 500. However, there are frequent changes in the major market index. In this Motley Fool Live video recorded on July 21, 2021, healthcare and cannabis bureau editor-analyst Olivia Zitkus and Motley Fool contributor Keith Speights discuss whether or not Moderna’s tenure on the S&P 500 index will be short-lived.