Today's Market Winners and Losers

The stock market is down Tuesday, with the Dow Jones Industrial Average down 0.24%, the Nasdaq down 0.26% and the S&P 500 down 0.23%. Today’s winners include a pharmaceutical firm which reported positive drug-test results and a food company getting bought by a rival firm. Today’s losers include a biotechnology company that resumed trading following a company  disaster and an oil driller whose well development is taking longer than anticipated.

These are Tuesday’s biggest winners.

Biggest Winners

Shares of ACADIA Pharmaceuticals Inc. (NASDAQ: ACAD) are up 142.61% to $5.58 on trading volume of 22.7 million shares. The company’s drug experiment to help patients with psychosis related to Parkinson’s disease was found to be effective. Before Tuesday, the 52-week high was $3.06.

Shares of Ralcorp Holdings Inc. (NYSE: RAH) are up 26.37% to $88.75 on trading volume of 20.4 million shares. ConAgra Foods Inc. (NYSE: CAG) has agreed to purchase Ralcorp for $6.8 billion, including debt. The 52-week high is $89.86.

Biggest Losers

Shares of Neptune Technologies & Bioresources, Inc. (NASDAQ: NEPT) are down 29.31% to $2.34 on trading volume of 2.4 million shares. Trading for this company began resuming Tuesday after it was halted for two weeks following an explosion at a Canada-based plant. The 52-week low is $2.18.

Shares of McMoRan Exploration Co. (NYSE: MMR) are down 22.70% to $7.46 on trading volume of 10 million shares. The oil and natural gas driller continues its drop after it announced that development of one of its wells its taking longer than initially expected. Before Tuesday, the 52-week low was $7.76.

Samuel Weigley

Follow him on Twitter: SWeigley