Stocks kicked off April and the second quarter of 2013 on a down note Monday. Most of the major indexes erased Thursday's work and then some. The Nasdaq took the biggest hit, falling 0.9% as Apple (AAPL) dragged the tech-laden index. Apple, which makes up about 7% of the Nasdaq, slumped 3% to its lowest levels in more than two weeks. According to Reuters, Fidelity Contrafund cut its stake in the company by 10% in the first two months of the year.