What follows is a look at stocks in the S&P 500 displaying unusual volume in today's trading session.
Some of the highlights include: DeVry (DV), Rockwell Automation (ROK), Molex (MOLX) and Caterpillar (CAT).
April is the best month to be in blue chips, if history is a guide.
Investors are celebrating the second strongest bull run since World War II.
Demand for small-cap stocks is increasing relative to established large-cap names.
With stocks up, short interest reached the highest level in 20 months, but some investors see the trend as a bullish sign.