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Cabot Oil, Merck, Pioneer Natural, Viacom: 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 4 p.m. in New York.

Energy producers rallied as crude oil rose to the highest level in more than three months amid optimism a recovering economy will fuel demand. Cabot Oil & Gas Corp. (COG US) advanced 7.7 percent to $86.55. Pioneer Natural Resources Co. (PXD US) climbed 6.7 percent to $92.12.

Advance Auto Parts Inc. (AAP US) gained 4.7 percent, the most since Aug. 11, to $69.51. The auto parts retailer based in Roanoke, Virginia, raised its full-year earnings forecast to at least $4.90 a share, exceeding the average analyst projection of $4.69 in a Bloomberg survey.

ATP Oil & Gas Corp. (ATPG US) slumped 14 percent to $7.25, the lowest price since Oct. 4. The Houston-based may not be able to make a May interest payment on $1.5 billion in notes after the company’s crude and natural-gas output plunged, Vivek Pal, an analyst at Knight Capital Group Inc. said.

Cisco Systems Inc. (CSCO US) jumped 5.7 percent, the most in the Dow Jones Industrial Average, to $18.61. The world’s biggest maker of networking equipment reported profit and sales that exceeded analysts’ estimates, bolstered by a turnaround effort and demand for data centers. The San Jose, California-based company was raised to “buy” at Citigroup Inc. and Deutsche Bank AG.

Computer Sciences Corp. (CSC US) had the biggest retreat in the Standard & Poor’s 500 Index, sliding 9.5 percent to $25.24. The provider of computer services to companies and U.S. government agencies was cut to “underweight” from “neutral” by JPMorgan Chase & Co.

Dynavox Inc. (DVOX US) rose the most in the Russell 2000 Index, surging 21 percent to $4.08. The seller of speech software for people with learning disabilities reported first-quarter sales of $26.2 million, 13 percent higher than the average analyst estimate in a Bloomberg survey.

EnerSys (ENS US) climbed 19 percent, the most since December 2008, to $26.22. The Reading, Pennsylvania-based maker and distributor of industrial batteries forecast third-quarter profit excluding some items of 67 cents a share at least. That topped the average analyst estimate of 63 cents from a Bloomberg survey.

Green Mountain Coffee Roasters Inc. (GMCR US) tumbled 39 percent, the most in the Russell 1000 Index, to $40.89. The maker of the Keurig single-cup brewing system reported fourth-quarter sales that trailed analysts’ estimates amid changes in wholesale customers’ buying habits.

Huntington Ingalls Industries Inc. (HII US) jumped 6.3 percent, the most since March 31, to $31. The U.S. Navy’s largest builder of surface warships reported third-quarter profit excluding some items of $1.05 a share, beating the average analyst estimate by 24 percent, according to Bloomberg data.

Intralinks Holdings Inc. (IL US) declined 13 percent to $4.80, the lowest price since its August 2010 initial public offering. The software maker was cut to “hold” from “buy” at Deutsche Bank AG.

Merck & Co. (MRK US) climbed 3.5 percent, the most since Aug. 11, to $34.97. The second-biggest U.S. drugmaker raised its dividend for the first time since 2004 and emphasized drug discovery in a meeting with analysts today.

Opnet Technologies Inc. (OPNT US) dropped 21 percent, the most since November 2007, to $35.68. The management software maker reported second-quarter sales that trailed analysts’ estimates.

Pegasystems Inc. (PEGA US) sank 21 percent, the most since August 2010, to $29.19. The developer of customer relationship management software reported third-quarter earnings excluding some items of 15 cents a share, missing the average analyst estimate by 52 percent, according to Bloomberg data.

Quad Graphics Inc. (QUAD US) tumbled 25 percent to $13.77, the lowest price since at least July 2010. The printing company reported third-quarter adjusted earnings of 80 cents a share, missing the average analyst estimate by 6 cents.

Silver Standard Resources Inc. (SSRI US) slumped 21 percent, the most since July 2002, to $15.13. The silver producer cut the resource and reserve estimates for its Pirquitas mine in Argentina and reduced its 2011 silver production forecast.

Vertex Pharmaceuticals Inc. (VRTX US) climbed 3.6 percent to $31.98, the biggest gain since Oct. 20. The drugmaker was raised to “equalweight” from “underweight” at Morgan Stanley.

Viacom Inc. (VIA/B US) rallied 8.2 percent, the biggest gain in the S&P 500, to $43.61. The owner of the MTV network and Paramount Pictures reported fourth-quarter profit and revenue that rose more than analysts estimated and boosted its stock-repurchase program by $6 billion.

Wynn Resorts Ltd. (WYNN US) fell 3.5 percent to $119.57, the lowest price since Oct. 4. Macquarie Group Ltd. said the velocity of money at the company’s Macau business may be slowing.

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