Today's Market Winners and Losers

The stock market is mixed Wednesday, with the Dow Jones Industrial Average up 0.14%, the Nasdaq down 0.14% and the S&P 500 up 0.05%. Today's winner is a popular company trying to capitalize on increasing use of mobile technology, while today's loser is a pharmaceutical company whose drug won't be covered by a major insurer.

This is Wednesday's biggest winner and loser.

Biggest Winner

Shares of Groupon Inc. (NASDAQ: GRPN) are up 8.74% to $5.10 on trading volume of 9.4 million shares. The daily-deals company on Wednesday announced it had introduced a mobile payment service for Apple Inc.'s (NASDAQ: AAPL) iPad and iPod Touch. The 52-week high is $31.14.

Biggest Loser

Shares of Questor Pharmaceuticals Inc. (NASDAQ: QCOR) are down 35.61% to $32.52 on trading volume of 10.8 million shares. Citron Research announced that Aetna Inc. (NYSE: AET) is dropping nearly all of its coverage for Questor's drug to help treat multiple sclerosis and nephrotic syndrome, according to The 52-week low is $24.14.

Samuel Weigley

Follow him on Twitter: SWeigley

Filed under: 24/7 Wall St. Wire, Market Roundups, Most Actives Tagged: AAPL, AET, GRPN, QCOR