Top Active Trader Alert Stocks (BHP, CHK, CLDA, FRX, JASO, MENT, YHOO, ZRAN)

Active traders and day traders have many stocks to choose from this Tuesday morning.  We are tracking news and moves in shares of BHP Billiton (NYSE: BHP), Chesapeake Energy Corporation (NASDAQ: CHK), Clinical Data, Inc. (NASDAQ: CLDA), Forest Labs (NYSE: FRX), JA Solar Holdings Co., Ltd. (NASDAQ: JASO), Mentor Graphics Corporation (NASDAQ: MENT), Yahoo! Inc. (NASDAQ: YHOO), and Zoran Corporation (NASDAQ: ZRAN).

Chesapeake Energy Corporation (NASDAQ: CHK) is up 5.5% before the market opens to $32.01, relative to a 52-week range of $19.62-$32.17. The company recently announced a deal to sell BHP Billiton (NYSE: BHP) a portion of its reserves.

Clinical Data, Inc. (NASDAQ: CLDA) is down 8% premarket on very heavy volume to $31.20, relative to a 52-week range of $10.87-$34.95. Forest Labs (NYSE: FRX) just announced plans to acquire Clinical Data in a deal valued at $1.2 billion.

JA Solar Holdings Co., Ltd. (NASDAQ: JASO) is down 3% premarket to $8.26, relative to a 52-week range of $4.22-$10.24. The company recently reported fourth quarter earnings.

Mentor Graphics Corporation (NASDAQ: MENT) is up $18% premarket to $17.12, relative to a 52-week range of $7.81-$15.64. Shares of the MENT are up ahead of fourth quarter earnings, which will be released on Thursday.

Yahoo! Inc. (NASDAQ: YHOO) is down 3.3% premarket on moderate volume to $17.08, relative to a 52-week range of $12.94-$19.12. Shares of YHOO had gained more than 5% the previous week.

Zoran Corporation (NASDAQ: ZRAN) is up 25% premarket to %11.65, relative to a 52-week range of $5.98-$12.22. The company is set to merge with BRIEF-CSR.