A selloff in tech found its legs again, wiping out the Nasdaq and weighing on broader markets. Losses in tech overshadowed a rally in crude oil prices and gains in the financials sector after the banks' stress tests. Blue Apron (APRN) opened for trading in its market debut on the New York Stock Exchange. The meal-kit delivery service was slightly higher than its issue price of $10 a share. Blue Apron sold 30 million shares in its IPO. Constellation Brands (STZ) climbed after quarterly profit beat estimates. Revenue fell slightly shy of consensus. Beer sales rose 8%, while wine and spirits climbed 4%. Staples (SPLS) agreed to be acquired by private-equity firm Sycamore Partners for $6.9 billion. That comes a year after Staples' deal with Office Depot (ODP) fell apart on regulatory concerns. The deal is expected to close by year's end.