Idenix Pharmaceuticals, Dell, Rio Tinto, Boston Scientific, Facebook, Dynavax Technologies, Research In Motion and Bankrate Inc. are among the companies whose shares are moving in pre-market trading Monday.

Idenix Pharmaceuticals Inc. (IDIX) stock climbed 10.26 percent to $5.64 in pre-market trading. The company stock was initiated with a “buy” rating with a price target of $7 at Deutsche Bank last week.

Dell Inc. (DELL) stock surged 4.05 percent to $10.03 in pre-market trading. The stock has a 52-week low of $8.69, a 52-week high of $18.36 and $16.72 billion in market capitalization.

Rio Tinto Plc. (RIO) stock gained 1.31 percent to $50.45 in pre-market trading. The stock has a 52-week low of $41.59, a 52-week high of $63.18 and $91.98 billion in market capitalization.

Boston Scientific Corp. (BSX) stock advanced 1.08 percent to $5.60 in pre-market trading. The company stock was upgraded to a “buy” rating from a “neutral” rating with a price target of $7.30 at Citigroup last week.

Facebook Inc. (FB) stock gained 1.18 percent to $28.33 in pre-market trading. Facebook and Zynga have amended a two-year-old contract to become less attached to each other.

Dynavax Technologies Corp. (DVAX) stock tumbled 14.08 percent to $2.44 in pre-market trading. The stock has a 52-week low of $2.22, a 52-week high of $5.34 and $507.53 million in market capitalization.

Research In Motion Ltd. (RIMM) stock fell 1.29 percent to $11.45 in pre-market trading. The company stock rallied last week after it was upgraded to a “buy” rating from a “neutral” rating with a price target of $16 at Goldman Sachs.

Bankrate Inc. (RATE) stock fell 1.66 percent to $11.83 in pre-market trading.  The stock has a 52-week low of $10.01, a 52-week high of $25.95 and $1.20 billion in market capitalization.