A COVID-19 vaccine would mark the top in stocks and set the stage for a rotation from growth stocks into value stocks, Bank of America said on Friday. Technology stocks remain overbought even after Thursday's steep sell-off, and a composite index of five mega-cap tech names are trading 41% above its 200-day moving average, according to BofA. The massive gap between the composite index price and its 200-day moving average signals that any sustained correction in tech stocks could be extremely sharp. A sell-off in tech stocks also reflects investor "impatience" with the delayed passing of another stimulus bill from Washington, D.C.