Morning Market Gainers

shares jumped 79.68 percent to $12.20. Oprah Winfrey will buy a 10 percent stake in Weight Watchers International, and will also join the company's board.

surged 27.45 percent to $1.30 after the company reported an award of export license for planned work in the Halden Research Reactor in Norway.

shares gained 18.52 percent to $6.72 after the company agreed to be acquired by Harrison Street Real Estate Capital for $1.9 billion.

shares climbed 13.48 percent to $11.62 on higher bid from

. Microsemi offered to acquire PMC-Sierra in a $2.4 billion deal.

rose 7.36 percent to $36.02. Diebold is in talks to acquire Wincor Nixdorf for €52.50 per share in cash and stock.

shares gained 3.91 percent to $10.77 after dipping 50.71 percent on Friday. Suntrust maintained a Buy rating on Zafgen and lowered the price target to $25 from $47.

rose 2.90 percent to $72.00. SanDisk is expected to post its quarterly earnings on October 21, 2015.