Why Fluor, Arista Networks, and Appian Slumped Today

Wall Street had its Cinco de Mayo celebration a day early, as the Dow Jones Industrial Averagefinished the session with a gain of more than 330 points. Investors were excited about what they saw as a Goldilocks-like reading on the U.S. economy in the April employment report, which featured modest job growth, rock-bottom unemployment rates, and slow enough wage growth to quell inflation fears and give the Federal Reserve latitude to raise interest rates more slowly going forward.

Yet some companies still suffered at least perceived setbacks that sent their shares lower. Fluor (NYSE: FLR), Arista Networks (NYSE: ANET), and Appian (NASDAQ: APPN)were among the worst performers on the day. Here's why they did so poorly.