GSV Capital Corp, Rio Tinto Plc, American International Group, BHP Billiton Limited, ZAGG Inc, Arena Pharmaceuticals, LinkedIn Corp and American Capital Agency Corp are among the companies whose shares are moving in the pre-market trading on Friday.

Gainers

GSV Capital Corp. (NASDAQ:GSVC) stock gained 4.58 percent to $7.99 in pre-market trading. The stock has a 52-week low of $6.84, a 52-week high of $19.71 and $147.61 million in market capitalization.

Rio Tinto Plc. (NYSE:RIO) stock advanced 3.75 percent to $46.73 in pre-market trading. The stock has a 52-week low of $41.59, a 52-week high of $60.45 and $83.20 billion in market capitalization.

American International Group Inc. (NYSE:AIG) stock rallied 2.78 percent to $43.30 in pre-market trading. The company on Thursday reported $1.34 earnings per share (EPS) for the first quarter, beating a consensus estimate of $0.87 by $0.47.

BHP Billiton Limited (NYSE:BHP) stock rose 2.33 percent to $67.24 in pre-market trading. The stock has a 52-week low of $6.84, a 52-week high of $19.71 and $147.61 million in market capitalization.

Losers

ZAGG Inc. (NASDAQ: ZAGG) shares tumbled 25.15 percent to $5.15 in pre-market trading. The company reported first quarter earnings per share of $0.11, $0.10 worse than the analysts' estimate of $0.21. Revenues for the quarter came in at $51.5 million versus the consensus estimate of $66.57 million. Zagg Inc. slashed its FY2013 revenue forecast to a range of $274 million - $280 million, from its previous guidance of $313 million - $318 million and a consensus estimate of $315.8 million.

Arena Pharmaceuticals Inc. (NASDAQ:ARNA) stock slumped 17.73 percent to $6.91 in pre-market trading. The company said that it has notified the European Medicines Agency that it is withdrawing the BELVIQ Marketing Authorization Application (MAA) in the European Union. Currently, Arena is evaluating the best approach for submitting the application at a later date.

LinkedIn Corp. (NYSE:LNKD) stock plunged 10.50 percent to $180.50 in pre-market trading. The company reported first quarter earnings of $22.6 million, or $0.20 per share, in the first quarter, up from $5 million, or $0.04 per share, in the same period last year. Revenue jumped 72 percent to nearly $325 million, higher than analysts' estimate of $318 million. However, for the second quarter, LinkedIn forecast total revenues in the range of $342 million to $347 million, below analysts' estimate of $360 million.

American Capital Agency Corp. (NASDAQ:AGNC) stock plunged 8.76 percent to $30.20 in pre-market trading. The company reported first quarter profit of $231 million down from $641 million in the same period last year.

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