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Apple, IXYS, NewMarket, Pfizer, Travelers: 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.

Align Technology Inc. (ALGN US) jumped 17 percent to $24.99, the highest price since October 2007. The maker of a teeth-straightening product forecast second-quarter sales of at least $106.5 million, beating the average analyst estimate of $104.8 million in a Bloomberg survey.

Apple Inc. (AAPL US) rose 2.4 percent, the most since March 21, to $350.70. The company said second-quarter profit almost doubled as rising demand for Mac computers and the iPhone outweighed lower-than-predicted sales of the iPad.

Biogen Idec Inc. (BIIB US) surged 15 percent to $99.70 for the biggest gain in the Standard & Poor’s 500 Index. The world’s largest maker of multiple sclerosis medicines reported results from a study of its MS pill BG-12 that exceeded analysts’ expectations.

Teva Pharmaceutical Industries Ltd. (TEVA US), which is developing another pill for MS, slid 8.5 percent to $45.01.

China Security & Surveillance Technology Inc. (CSR US) rose 15 percent to $5.55, the highest price since Nov. 10. The maker of security systems agreed to be taken private by Chairman and Chief Executive Officer Guoshen Tu at $6.50 a share.

Entegris Inc. (ENTG US) jumped 7.8 percent, the most since Feb. 14, to $8.89. The maker of packaging equipment forecast second-quarter profit to be at least 22 cents a share, exceeding the 21-cent average estimate by analysts.

F5 Networks Inc. (FFIV US) increased 7.2 percent to $106.87, the highest price since March 15. The maker of software to handle Internet traffic and content forecast third-quarter profit of as much as 91 cents a share, topping the 89-cent average estimate by analysts.

HNI Corp. (HNI US) slipped 14 percent, the most since June 1987, to $26.42. The office-furniture maker had its 2011 earnings estimate reduced to 95 cents a share from $1.10 by Robert W. Baird & Co., which said price pressures will persist, hurting profitability.

IXYS Corp. (IXYS US) rose 19 percent to $14.71, the highest price since July 2005. The chipmaker said sales for the year ended in March 31 were at least $362 million, exceeding the average analyst estimate of $352.3 million in a Bloomberg survey.

NewMarket Corp. (NEU US) rallied 15 percent to $179.52, the highest price since at least 1980. The producer of fuel and lubricant additives boosted its dividend as first-quarter profit beat analysts’ estimates.

Pfizer Inc. (PFE US) slumped 3 percent to $19.79 for the biggest loss in the Dow Jones Industrial Average. The world’s biggest drugmaker tumbled after a study summary showed four deaths among patients taking the company’s experimental rheumatoid arthritis pill in combination with other treatments.

Plexus Corp. (PLXS US) gained 9.5 percent, the most since January 2010, to $36.92. The contract electronics manufacturer forecast earnings in the third-quarter to be at least 52 cents a share, topping the average analyst estimate of 48 cents.

Select Comfort Corp. (SCSS US) surged 30 percent to $17.29, the highest price since September 2007. The maker of Sleep Number adjustable beds forecast earnings in 2011 of at least 85 cents a share, beating the 71-cent average estimate by analysts.

SLM Corp. (SLM US) climbed 13 percent to $16.31, the highest price since September 2008. The student-loan maker boosted its full-year earnings forecast as it declared its first dividend since 2007 and said it may buy back shares.

TradeStation Group Inc. (TRAD US) rose the most in the Russell 2000 Index, soaring 31 percent to $9.69. Monex Group Inc. (8698 JP) offered to buy the brokerage firm for $411 million, or $9.75 per share.

Travelers Cos. (TRV US) climbed 3.7 percent to $61.32 for the biggest gain in the Dow Jones Industrial Average. The insurer said first-quarter profit rose 30 percent on an increase in policy sales and lower catastrophe costs. The company lifted its quarterly dividend 14 percent to 41 cents a share.

Travelzoo Inc. (TZOO US) surged 28 percent to $94.22, the highest price since January 2005. The Internet travel marketer reported first-quarter profit that topped analysts’ estimates and said it reached a settlement on a State of Delaware unclaimed-property review.

UnitedHealth Group Inc. (UNH US) rallied 8.1 percent to $47.81, the highest price since February 2008. The largest U.S. insurer by sales raised its full-year forecast after reporting quarterly profit that beat analyst estimates as enrollment increased and medical-spending fell.

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