US Treasury Secretary Janet Yellen said, “It may be that interest rates will have to rise somewhat to make sure that our economy doesn’t overheat.” The comments exacerbated a sell-off in major technology shares with Apple (-3.5%), Tesla (-1.7%) and Amazon (-2.2%) all lower on valuation concerns. Pfizer shares rose by 0.3% after posting quarterly results that beat analyst expectations. Shares of CVS Health gained 4.4% after raising its 2021 profit view. Research and advisory company Gartner’s shares jumped 14.2% after delivering better-than-expected first-quarter earnings. The Dow Jones index rose by 20 points or 0.1%. But the S&P 500 index lost 0.7% and the Nasdaq index dropped 262 points or 1.9%.