Achillion, Coldwater, OpenTable, Spartech: U.S. Equity Movers

Shares of the following companies had unusual moves in U.S. trading. Stock symbols are in parentheses, and prices are as of 4p.m. in New York.

Achillion Pharmaceuticals Inc. (ACHN) rallied 8.4 percent to $6.20, the highest price since Aug. 5. The New Haven, Connecticut-based biopharmaceutical company may explore a merger or licensing agreement with Pharmasset Inc. (VRUS) , DealReporter said, citing Chief Executive Officer Michael Kishbauch. Pharmasset rose 5.9 percent to $76.16.

Caliper Life Sciences Inc. (CALP) rose the most in the Russell 2000 Index, surging 41 percent to $10.43. PerkinElmer Inc. (PKI) agreed to buy the maker of lab products for about $600 million, or $10.50 a share, to expand in molecular imaging.

PerkinElmer declined 5.9 percent to $20.75.

Casey’s General Stores Inc. (CASY) fell 6.5 percent, the most since March 8, to $42.86. The Ankeny, Iowa-based operator of convenience stores in the U.S. Midwest reported first-quarter earnings of $1.03 a share, missing the average analyst estimate by 3 cents.

Coldwater Creek Inc. (CWTR) rallied 24 percent, the most since August 2010, to $1.15. Chief Executive Officer Dennis C. Pence bought 342,876 shares of the clothing retailer this week, according to a regulatory filing.

Dollar General Corp. (DG) lost 5.7 percent, the most since June 1, to $35. The dollar store chain said in a regulatory filing that holders will sell 25 million shares. The Goodlettsville, Tennessee-based company won’t receive any proceeds from the sale.

G-III Apparel Group Ltd. (GIII) dropped 17 percent, the most in the Russell 2000, to $23.82. The clothing manufacturer that has licenses with Kenneth Cole Productions Inc. (KCP) and the Timberland Co. (TBL) estimated third-quarter profit of as little as $2.25 a share. The average of analyst projections in a Bloomberg survey is $2.35 a share.

OpenTable Inc. (OPEN) fell 8.3 percent, the most since May 4, to $57.50. Google Inc. (GOOG US) agreed to purchase Zagat Survey LLC, a rival restaurant review and ratings service.

Pall Corp. (PLL) fell 9.8 percent to $44.03, the worst performance in the S&P 500. The supplier of filters for drugmakers and refineries said fourth-quarter profit was 76 cents a share, excluding some items. Analysts on average estimated 88 cents a share, according to a Bloomberg survey.

Quicksilver Resources Inc. (KWK) fell 8.8 percent, the most since Aug. 8, to $8.76. The Fort Worth, Texas-based oil and natural gas producer was cut to “neutral” from “buy” at UBS AG.

Smithfield Foods Inc. (SFD) fell 8.4 percent, the most since October 2009, to $20.27. The world’s largest pork processor posted quarterly revenue that fell short of analyst projections, according to data compiled by Bloomberg. The company also said feed costs will remain a “challenge.”

Spartech Corp. (SEH) gained 6.9 percent to $4.36 the highest price since Aug. 31. The maker of plastic sheeting and molded products reported third-quarter earnings and sales that beat analysts’ estimates.

Titan Machinery Inc. (TITN) plunged 16 percent, the most since October 2008, to $22.89. The owner of full-service agricultural and construction equipment stores said earnings this year may be as low as $1.56 a share. Analysts project $1.64 a share on average, data compiled by Bloomberg show.

Valero Energy Corp. (VLO) climbed 4.1 percent to $23.19 for the second-largest gain in the S&P 500. The biggest U.S. refinery will make at least $2 a share excluding some items in the third quarter, Chief Executive Officer William Klesse said at a Barclays Plc conference. That compares with the $1.45 average analyst estimate, according to a Bloomberg survey.

Yahoo! Inc. (YHOO US) rose 6.1 percent, the biggest gain in the S&P 500, to $14.44. Third Point LLC disclosed that it had bought a 5.1 percent stake and sent a letter urging board members to resign, saying directors diminished shareholder value.

To contact the reporter on this story: Lu Wang in New York at lwang8@bloomberg.net.

To contact the editor responsible for this story: Nick Baker at nbaker7@bloomberg.net

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