Closing Bell: Where's that beef? (DVAX, MON, SWHC, TXN, UNH)

Dynavax Technologies Corporation (NASDAQ: DVAX) was the winner of the day in biotech-land and was up close to 50% after a clinical hold was removed by the FDA in its hepatitis treatment. Shares were up 46% at $2.57 right before the closing bell.

Monsanto Co. (NYSE: MON) was down all day after issuing an earnings warning. The ag and seed company was down 5% at $79.28 right before the close.

Smith & Wesson Holding Corp. (NASDAQ: SWHC) was up big on earnings and didn't look like an old Dirty Harry nor a dirty something else.... The gun maker said that profit was twice what analysts were calling for. Shares were up almost 7% at $5.99 right before the closing bell.

Texas Instruments Inc. (NYSE: TXN) was down despite the notion that it raised guidance. The new quarterly guidance is $0.37 to $0.41 EPS on $2.73 to $2.87 billion in revenues. The prior guidance was $0.29 to $0.39 EPS and $2.5 to $2.8 billion in revenues. TI was down 0.5% at $25.00 right before the closing bell.

UnitedHealth Group, Inc. (NYSE: UNH) was a lynchpin stock to watch now that the Obama plan for healthcare and health insurance reform does include both a public option and includes an insurance exchange. But shares were up 2.5% at $29.11 right at the close.