Companies whose shares are expected to trade actively in today’s session are Opexa Therapeutics Inc. (NASDAQ:OPXA), Idenix Pharmaceuticals, Inc. (NASDAQ:IDIX), Silicon Motion Technology Corp. (NASDAQ:SIMO), Yum! Brands, Inc. (NYSE:YUM), Hologic, Inc. (NASDAQ:HOLX) and Rudolph Technologies Inc (NASDAQ:RTEC).

stocks to watch

Opexa Therapeutics Inc. (NASDAQ:OPXA): The biopharmaceutical company has been awarded a $225 million commercialization deal with Merck & Co. for its multiple-sclerosis therapy Tcelna. Shares surged 267 percent to $4.44 in early market trading.

Idenix Pharmaceuticals, Inc. (NASDAQ:IDIX): The pharmaceutical company has decided to discontinue its clinical trial program for two of its molecules to treat Hepatitis C. The decision came after the U.S. FDA said the treatments would be kept on clinical hold. Shares dipped 1.30 percent in early trading to $4.65.

Silicon Motion Technology Corp. (NASDAQ:SIMO): The semiconductor product maker’s fourth quarter earnings plunged 11 percent amid decline in sales of LTE transceivers. Results fell short of Wall Street estimates, and the company issued a downbeat outlook for the current quarter. Shares initially fell 11 percent to $13.04 in after-hours trading, but surprisingly gained 1.03 percent to $14.73 early in today’s session.

Yum! Brands, Inc. (NYSE:YUM): The fast-food chain’s fourth quarter earnings slipped 5.3 percent. The company’s same-store sales in the Chinese market were hit by negative publicity from the government on its poultry supplies. However, U.S. same-store sales improved. Yum said it will take time to regain consumer confidence. Shares dipped 6.16 percent to $60 in early trading session.

Hologic, Inc. (NASDAQ:HOLX): The healthcare company’s first quarter earnings fell despite strong revenue growth. The company faced higher acquisition charges and other items. The company’s second quarter earnings forecast was also lower than expectations. Shares declined 1.50 percent to $22.90 in early trading.

Rudolph Technologies Inc (NASDAQ:RTEC): Rudolph’s fourth quarter revenues surged, and profits improved due to tax-related adjustments. But shares plunged 9.66 percent to $12.07 in early market trading.

Another company to look for is Thor Industries, Inc. (NYSE:THO). The company posted strong growth in sales of recreational vehicles. Its second quarter earnings easily topped Wall Street estimates.