NV Energy, James River Coal Co, Lexicon Pharmaceuticals, Facebook, MEMC Electronic Materials, Boardwalk Pipeline Partners, Vanguard Natural Resources, Aruba Networks, Alcoa Inc. and Halliburton Co. are among the companies whose shares are moving in pre-market trading on Thursday.

Gainers

NV Energy, Inc. (NYSE:NVE) stock shot up 24.43 percent to $23.99 in pre-market trading. MidAmerican Energy Holdings and NV Energy announced on Wednesday that they have reached a definitive agreement for MidAmerican to acquire NV Energy for about $5.6 billion or $23.75 per share.

James River Coal Co. (NASDAQ:JRCC) stock gained 4.78 percent to $3.07 in pre-market trading. The stock has a 52-week low of $1.46, a 52-week high of $5.89 and $105.06 million in market capitalization.

Lexicon Pharmaceuticals, Inc. (NASDAQ:LXRX) stock advanced 3.60 percent to $2.30 in pre-market trading. The stock has a 52-week low of $1.53, a 52-week high of $3.28 and $1.14 billion in market capitalization.

Facebook Inc. (NASDAQ:FB) stock advanced 3.73 percent to $24.19 in pre-market trading. The company stock was upgraded to a “buy” rating from “hold” by Jefferies on Thursday. Facebook's stock has seen a 52-week low of $17.55, a 52-week high of $33.45 and $56.39 billion in market capitalization.

MEMC Electronic Materials, Inc. (NYSE:WFR) stock gained 3.41 percent to $7.88 in pre-market trading. The stock has a 52-week low of $1.44, a 52-week high of $7.80 and $1.77 billion in market capitalization.

Losers

Boardwalk Pipeline Partners, LP (NYSE:BWP) stock declined 4.76 percent to $29.80 in pre-market trading. The company announced on Wednesday that it plans to offer 11 million common units representing limited partner interests in a registered offering.

Vanguard Natural Resources, LLC (NASDAQ:VNR) stock fell 4.66 percent to $28.26 in pre-market trading. Vanguard announced on Wednesday that it has a public offering of 7 million common units representing limited liability company interests in the company.

Aruba Networks, Inc. (NASDAQ:ARUN) stock declined 3.89 percent to $14.09 in pre-market trading. The stock has a 52-week low of $12.36, a 52-week high of $26.78 and $1.67 billion in market capitalization.

Alcoa Inc. (NYSE:AA) stock fell 1.63 percent to $8.44 in pre-market trading. Moody's Investors Service on Wednesday lowered Alcoa’s credit rating to junk status, citing lower metal prices and continued challenges in the aluminum industry.

Halliburton Co. (NYSE:HAL) stock declined 1.08 percent to $43.10 in pre-market trading. The stock has a 52-week low of $26.28, a 52-week high of $45.75 and $40.61 billion in market capitalization.