Cytori Therapeutics, Commtouch Software, Silicom Ltd, Perion Network, Yahoo Inc, XenoPort Inc, National Bank of Greece, Texas Instruments Incorporated, and Gold Fields Limited are among the companies whose shares are moving in the pre-market trading on Monday.

Gainers

Cytori Therapeutics Inc. (NASDAQ:CYTX) stock surged 36.88 percent to $3.60 in pre-market trading. The company stock has a 52-week low of $2.01, a 52-week high of $4.93 and $176.67 million in market capitalization.

Commtouch Software Ltd. (NASDAQ:CTCH) stock rose 5.10 percent to $3.09 in pre-market trading. The company stock has a 52-week low of $1.98, a 52-week high of $3.99 and $70.84 million in market capitalization.

Silicom Ltd. (NASDAQ:SILC) stock advanced 4.12 percent to $34.85 in pre-market trading. The company stock has a 52-week low of $13.11, a 52-week high of $34.30 and $231.78 million in market capitalization.

Perion Network Ltd. (NASDAQ:PERI) stock gained 3.27 percent to $14.85 in pre-market trading.  The company stock has a 52-week low of $3.68, a 52-week high of $14.94 and $144.38 million in market capitalization.

Yahoo Inc (NASDAQ:YHOO) shares climbed 1.81 percent to $27.00 in pre-market trading.  The company stock has a 52-week low of $14.59, a 52-week high of $27.68 and $29.58 billion in market capitalization.

Losers

XenoPort Inc. ( NASDAQ:XNPT) stock declined 14.81 percent to $5.75 in pre-market trading. The company announced top-line results from its pivotal Phase 3 clinical trial of Arbaclofen Placarbil (AP) for the treatment of patients with spasticity due to multiple sclerosis (MS) on Monday. The trial was unsuccessful in demonstrating that AP provided statistically significant improvement relative to placebo in the co-primary endpoints of the study. The company stock has a 52-week low of $5.00, a 52-week high of $12.98 and $319.96 million in market capitalization.

National Bank of Greece (NYSE:NBG) stock lost 11.30 percent to $2.12 in pre-market trading. The company stock has a 52-week low of $0.61, a 52-week high of $3.25 and $2.29 billion in market capitalization.

Texas Instruments Incorporated (NASDAQ:TXN) stock fell 9.03 percent to $33.45 in pre-market trading. The company stock has a 52-week low of $26.06, a 52-week high of $37.35 and $40.78 billion in market capitalization.

Gold Fields Limited (NYSE:GFI) shares lost 4.65 percent to $5.54 in pre-market trading. The company stock has a 52-week low of $5.80, a 52-week high of $14.04 and $4.24 billion in market capitalization.