Pre-Market Movers (Chesapeake Energy, Amazon.com, Ultra Petroleum, Qiagen, RIM, KB Home, Facebook, Yahoo, UBS)

Chesapeake Energy Corp, Amazon.com, Ultra Petroleum, Qiagen N.V., Research In Motion, KB Home, Facebook Inc, Yahoo Inc and UBS AG are among the companies whose shares are moving in the pre-market trading Wednesday.

Chesapeake Energy Corp. (NYSE:CHK) stock rallied 9.65 percent to $20.80 in pre-market trading. The company announced Tuesday that its co-founder, chief executive officer and president Aubrey K. McClendon would retire April 1, 2013 and continue to serve as chief executive officer until the appointment of his successor.

Amazon.com, Inc. (NASDAQ:AMZN) stock climbed 8.24 percent to $281.80 in pre-market trading. Its fourth quarter revenue surged 22 percent to $21.27 billion from $17.43 billion in the same period last year. Operating profit climbed 56 percent to $405 million from $260 million in the same quarter last year.

Ultra Petroleum Corp. (NYSE:UPL) stock surged 3.29 percent to $18.50 in pre-market trading. The stock has a 52-week low of $17.24, a 52-week high of $25.71 and $2.74 billion in market capitalization.

Qiagen N.V. (NASDAQ:QGEN) stock advanced 3.10 percent to $20.60 in pre-market trading. The company reported fourth quarter adjusted net income of $82.8 million or $0.34 per share, up from $73.6 million or $0.31 per share in the same period last year and also topped analysts’ estimation of $0.30 per share. Currently, Qiagen expects fiscal 2013 adjusted net profit to be in a range of $1.16 to $1.18 per share, above analysts forecast of $1.10 per share.

Research In Motion Ltd. (NASDAQ:RIMM) shares rose 2.17 percent to $16.00 in pre-market trading. The stock has a 52-week low of $6.22, a 52-week high of $18.32 and $8.06 billion in market capitalization.

KB Home (NYSE:KBH) stock rose 1.50 percent to $18.90 in pre-market trading. The stock has a 52-week low of $6.46, a 52-week high of $18.99 and $1.44 billion in market capitalization.

Facebook Inc. (NASDAQ:FB) stock advanced 1.46 percent to $31.24 in pre-market trading. The company is expected to report fourth quarter net profit of $0.15 per share on revenue of $1.52 billion after the closing bell Wednesday.

Yahoo Inc. (NASDAQ:YHOO) stock advanced 1.37 percent to $19.97 in pre-market trading. The company stock plunged 3 percent in regular trading Tuesday.

UBS AG (NYSE:UBS) stock declined 1.08 percent to $17.36 in pre-market trading. The company stock was downgraded to “neutral” rating from an “outperform” rating at Exane BNP Paribas.