National Bank of Greece, SINA Corporation, ArcelorMittal, Tesla Motors, Nokia Corporation, Aruba Networks Inc, 3D Systems Corp., Triple-S Management Corp. and J.C. Penney Company Inc are among the companies whose shares are moving in the pre-market trading on Friday.

Gainers

National Bank of Greece (NYSE:NBG) shares climbed 11.50 percent to $2.23 in pre-market trading. NBG shares gained more than 18 percent in regular trading on Thursday after Fitch Ratings upgraded Long-Term Issuer Default Ratings of National Bank of Greece from F to B-.

SINA Corporation (NASDAQ:SINA) shares climbed 4.74 percent to $61.60 in pre-market trading. SINA Corporation, the online media company that runs China’s biggest micro-blogging service reported first quarter net loss of $13.2 million, in comparison to a loss of $13.7 million a year earlier. Non-advertizing revenues rose 17 percent to $27 billion.

ArcelorMittal (NYSE:MT) stock rose 2.97 percent to $12.84 in pre-market trading. The stock has a 52-week low of $11.15, a 52-week high of $17.99 and $19.32 billion in market capitalization.

Tesla Motors, Inc. (NASDAQ:TSLA) shares rose 2.82 percent to $94.85 in pre-market trading. The company shares surged more than 8 percent in regular trading on Thursday.

Nokia Corporation (NYSE:NOK) stock increased 2.17 percent to $3.77 in pre-market trading. The company stock has a 52-week low of $1.63, a 52-week high of $4.90 and $13.82 billion in market capitalization.

Losers

Aruba Networks Inc. (NASDAQ:ARUN) shares tumbled 20.56 percent to $13.99 in pre-market trading. The company reported third quarter earnings of $0.11 per share, below analysts' estimate of earnings of $0.15 per share. Revenues for the quarter stood at $147.1 million versus the consensus estimate of $154.59 million.

3D Systems Corp. (NYSE:DDD) stock declined 3.55 percent to $43.97 in pre-market trading. The company stock has a 52-week low of $17.04, a 52-week high of $51.94 and $4.24 billion in market capitalization.

J.C. Penney Company Inc. (NYSE:JCP) shares lost 2.08 percent to $18.40 in pre-market trading. The company reported on Thursday first quarter loss of $239 million, or $1.31 a share, on revenues of $2.64 billion in its first quarter ending May 4, recording a 16.4 percent decline from the same period last year. Analysts polled by Thomson Reuters had forecast a loss of $0.89 per share on revenues of $2.74 billion.

Triple-S Management Corp. (NYSE:GTS) stock plunged 2.04 percent to $18.72 in pre-market trading. The company stock has a 52-week low of $16.05, a 52-week high of $21.60 and $543.94 million in market capitalization.

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