The SPDR Dow Jones Industrial Average ETF (DIA), SPDR S&P 500 ETF Trust (SPY), and Invesco QQQ Trust (QQQ) are all showing significant losses just after 12:30 PM EST. "Concerns that the Delta mutation will slow or even reverse the recovery efforts appear to be sapping risk-taking appetites," said Marc Chandler, chief market strategist at Bannockburn Global Forex. “The composition of recent data suggests that inflation will largely prove transitory as the Fed has stated,” said Ryan Detrick, LPL Financial's chief market strategist, in a note to clients last week.