Stocks were mixed at Monday's opening bell amid a slew of global economic news and corporate earnings. China's Shanghai Composite rose as the country cut interest rates on Sunday for the third time in six months. Meanwhile, the uncertainty of another bailout for Greece weighed on some European markets, as the country is expected to make a 770 million euro repayment to the International Monetary Fund on Tuesday. Elsewhere, shares of Dean Foods (DF) are jumping after the dairy company reported better-than-expected first-quarter adjusted profit. The company benefited from lower milk costs during the quarter. Meanwhile, Dish Network (DISH) was edging higher after reporting slightly higher year-over-year quarterly revenue. However, the media company continues to lose pay-TV subscribers.