Market Catalysts Host Julie Hyman and Yahoo Finance Senior Reporter Brooke DiPalma track several of the day's top trending stock tickers, including memory chip stocks Micron Technology (MU), Intel (INTC), and Qualcomm (QCOM) opening at record highs; shares of Moderna (MRNA) and Novavax (NVAX) reacting to concerns around the hantavirus; and Constellation Energy (CEG) affirming its full-year guidance after beating first quarter earnings estimates.