Why First Solar, Arconic, and Celgene Slumped Today

Wall Street saw some turbulence on Monday, as major benchmarks initially rose, gave up their gains, and then continued to oscillate up and down throughout the day before finishing lower. Many investors paid most of their attention to massive corporate mergers, including deals involving some of the largest U.

S. wireless carriers, as well as giants in the oil refinery world. Nevertheless, not all stocks benefited from good news, and some individual companies got hit with setbacks. First Solar (NASDAQ: FSLR), Arconic (NYSE: ARNC), and Celgene (NASDAQ: CELG)were among the worst performers on the day. Here's why they did so poorly.