Pre-Market Movers (Radioshack, Mellanox, Zynga, Sangamo, Stillwater, Facebook, ARM Holdings, Alcoa )

Radioshack Corp, Mellanox Technologies, Zynga Inc, Sangamo Biosciences, Stillwater Mining, Facebook, ARM Holdings and Alcoa Inc are among the companies whose shares are moving in the pre-market trading Tuesday.

Radioshack Corp. (NYSE:RSH) stock climbed 7.36 percent to $2.48 in pre-market trading. The company announced Monday that it ended its partnership with Target Corp to run mobile phone centers in its stores after failing to negotiate a new deal that would be financially appealing to both companies.

Mellanox Technologies, Ltd. (NASDAQ:MLNX) stock surged 3.94 percent to $52.50 in pre-market trading. The stock has a 52-week low of $30.00, a 52-week high of $120.05 and $2.14 billion in market capitalization.

Zynga Inc. (NASDAQ:ZNGA) stock gained 3.05 percent to $2.70 in pre-market trading. The stock has a 52-week low of $2.09, a 52-week high of $15.91 and $2.05 billion in market capitalization.

Sangamo Biosciences, Inc. (NASDAQ:SGMO) stock advanced 2.56 percent to $8.41 in pre-market trading. The company stock climbed more than 17 percent in regular trading Monday.

Stillwater Mining Co. (NYSE:SWC) stock gained 1.82 percent to $13.95 in pre-market trading. The stock has a 52-week low of $7.47, a 52-week high of $15.24 and $1.60 billion in market capitalization.

Facebook Inc. (NASDAQ:FB) stock gained nearly 1 percent to $31.25 in pre-market trading. The stock has a 52-week low of $17.55, a 52-week high of $45.00 and $67.05 billion in market capitalization.

ARM Holdings Plc (NASDAQ:ARMH) stock plunged 4.76 percent to $40.38 in pre-market trading. The company stock was downgraded to “neutral” from “overweight” rating by Piper Jaffray Monday.

Alcoa Inc. (NYSE:AA) stock declined 1.01 percent to $8.83 in pre-market trading. The stock has a 52-week low of $7.97, a 52-week high of $10.92 and $9.52 billion in market capitalization.