20 Stocks Moving In Thursday's Pre-Market Session

Gainers

• ShoreTel Inc SHOR shares rose 28.2 percent to $7.50 in pre-market trading. Mitel Networks Corp MITL announced plans to acquire Shortel for $7.50 per share in cash.
• Teekay Offshore Partners L.P. TOO shares rose 17.8 percent to $3.04 in pre-market trading. Brookfield Business Partners L.P. BBU agreed to acquire 60 percent of Teekay Offshore Partners for $750 million.
• Teekay Corporation TK rose 13.7 percent to $9.74 in pre-market trading. Brookfield Business Partners agreed to acquire 60 percent of Teekay Offshore Partners for $750 million.
• GNC Holdings Inc GNC rose 13 percent to $10.59 in pre-market trading as the company reported upbeat quarterly earnings.
• AXT Inc AXTI rose 11.3 percent to $8.46 in pre-market trading. AXT reported Q2 profit of $1.9 million on revenue of $23.6 million.
• Cloud Peak Energy Inc. CLD rose 10.2 percent to $3.99 in pre-market trading after gaining 0.56 percent on Wednesday.
• Diageo plc (ADR) DEO rose 7.6 percent to $129.77 in pre-market trading as the company reported a 1.5 billion pound buyback plan and raised its profit view..
• Facebook Inc FB shares rose 7.6 percent to $178.12 in pre-market trading as the company reported stronger-than-expected results for its second quarter.
• Pingtan Marine Enterprise Ltd PME rose 6.3 percent to $4.41 in pre-market trading after the company disclosed a strategic cooperation framework agreement with JD.com.
• Alexion Pharmaceuticals, Inc. ALXN shares rose 5.7 percent to $138.50 in the pre-market trading session after reporting upbeat quarterly earnings.

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Losers

• Community Health Systems CYH fell 17.4 percent to $6.99 in pre-market trading. The company projects Q2 adjusted loss of $0.25 per share on revenue of $4.14 billion.
• AstraZeneca plc (ADR) AZN shares fell 15 percent to $28.88 in pre-market trading after the company reported Q2 results and announced disappointing update for lung cancer trial.
• Essendant Inc ESND fell 13.9 percent to $11.55 in pre-market trading as the company posted weak quarterly earnings.
• Arbutus Biopharma Corp ABUS shares rose 13.3 percent to $3.25 in pre-market trading as the company reported conclusion of LNP license agreement with Alexion.
• Twitter Inc TWTR fell 9.6 percent to $17.72 in pre-market trading. Twitter reported stronger-than-expected earnings for its second quarter. Monthly active users rose 5 percent year-over-year, while daily active users gained 12 percent year-over-year.
• F5 Networks, Inc. FFIV shares fell 9.5 percent to $116.00 as the company posted downbeat Q3 revenue and issued a weak forecast for the fourth quarter.
• CGG SA (ADR) CGG fell 9.3 percent to $3.99 in pre-market trading after rising 0.46 percent on Wednesday.
• Buffalo Wild Wings BWLD fell 8.7 percent to $112.00 in pre-market trading after the company posted downbeat quarterly earnings.
• Qualstar Corporation QBAK shares fell 6 percent to $9.99 in pre-market trading after declining 8.83 percent on Wednesday.
• Bristol-Myers Squibb Co BMY fell 5.1 percent to $53.10 in pre-market trading. Bristol-Myers Squibb reported Q2 adjusted earnings of $0.74 per share on sales of $5.1 billion.