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.
Big 5 Sporting Goods Corp. (BGFV US) slumped 13 percent, the most since November 2008, to $10.25. The athletic-gear retailer forecast second-quarter earnings to be no more than 14 cents a share, missing the average analyst estimate of 23 cents.
CardioNet Inc. (BEAT US) rallied 12 percent, the most since December 2009, to $4.96. The maker of wireless heart-monitoring devices reported an adjusted loss of 2 cents a share, narrower than the 14-cent loss estimated by analysts on average.
CBS Corp. (CBS US) rose 7.8 percent to $27.21, the highest price since December 2007. The owner of the most-watched U.S. television network doubled its dividend after reporting first-quarter profit that beat analysts’ estimates.
Century Aluminum Co. (CENX US) fell 16 percent, the most since May 2009, to $16.52. The second-largest U.S. producer of the metal reported first quarter earnings excluding some items of 24 cents a share, missing the average analyst estimate by 9.8 percent.
FEI Co. (FEIC US) increased 8.3 percent, the most since Feb. 4, to $34.38. The maker of equipment for nanotechnology laboratories forecast profit of at least 55 cents a share in the second quarter. The average estimate from analysts in a Bloomberg survey was 47 cents.
First Solar Inc. (FSLR US) fell 6.2 percent, the most since Nov. 16, to $126.31. The world’s largest maker of thin-film solar modules reported first-quarter profit fell 33 percent as competition from Chinese manufacturers increased and prices declined in Europe, its largest market.
Garmin Ltd. (GRMN US) advanced 5.3 percent, the most since Oct. 26, to $35.28. The maker of global-positioning equipment reported first-quarter adjusted earnings of 43 cents a share, beating the 32-cent average estimate by analysts.
Green Mountain Coffee Roasters Inc. (GMCR US) soared 19 percent to $75.98, the second-biggest gain in the Russell 1000 Index. The seller of Keurig single-cup brewers boosted its 2011 earnings forecast to as much as $1.50 a share, excluding certain items, beating the average analyst estimate in a Bloomberg survey.
Harris Corp. (HRS US) slumped 8.4 percent to $48.53, the second-biggest decline in the Standard & Poor’s 500 Index. The provider of information technology services to the government cut its 2011 revenue forecast to $5.9 billion from $6 billion after reporting third-quarter sales that missed the average analyst estimate.
Motricity Inc. (MOTR US) slid 14 percent to $10.99, the lowest price since Sept. 24. The provider of mobile-data services forecast second-quarter revenue may be as little as $36 million, less than the average analyst estimate of $37.1 million.
Novellus Systems Inc. (NVLS US) rallied 6.5 percent to $32.92, the second-biggest gain in the S&P 500. The semiconductor equipment maker announced an offering of $525 million in senior convertible notes, of which $400 million will be used for stock buybacks.
OpenTable Inc. (OPEN US) dropped 15 percent to $89.35, the most intraday since its initial public offering in May 2009. The online restaurant-reservation service said Chief Executive Officer Jeffrey Jordan resigned and will be replaced by Matthew Roberts, the company’s chief financial officer since 2005.
Oplink Communications Inc. (OPLK US) declined 5.4 percent, the most since April 11, to $18.02. The maker of fiber-optic equipment forecast fourth-quarter earnings excluding some items of 28 cents a share at most, trailing the average estimate of 47 cents in a Bloomberg survey of two analysts.
Quest Software Inc. (QSFT US) slid 11 percent, the most since May 2006, to $22.44. The Aliso Viejo, California-based maker of database-management programs reported first-quarter earnings of 20 cents a share excluding some items, missing the average analyst estimate by 30 percent, according to Bloomberg data.
Ralcorp Holdings Inc. (RAH US) climbed 4.9 percent to $87.39, the highest price since the shares started trading after the sale of the company’s brand-name cereal business to General Mills Inc. in February 1997. ConAgra Foods Inc. (CAG US), the maker of Hunt’s ketchup and Healthy Choice frozen meals, made an offer to buy the company for $86 a share in cash, or about $4.9 billion. ConAgra also offered to assume $2.5 billion in debt. Ralcorp’s directors unanimously rejected the approach. ConAgra rose 3.1 percent to $25.51.
Silicon Graphics International Corp. (SGI US) jumped 24 percent, the most since Feb. 3, to $20.49. The maker of computer servers reported third-quarter sales of $143.7 million, beating the $136 million average analyst estimate.
ValueClick Inc. (VCLK US) rose 9.6 percent to $18.05, the highest price since June 2008. The Internet advertising company forecast second-quarter adjusted earnings of as much as 26 cents a share, topping the average analyst estimate by as much as 3 cents.
Varian Semiconductor Equipment Associates Inc. (VSEA US) surged 51 percent to $61.36, the biggest gain in the Russell 1000. Applied Materials Inc. (AMAT US), the world’s largest producer of chipmaking equipment, agreed to buy Varian company for $4.9 billion in cash. Applied Materials will pay $63 a share, a 55 percent premium over yesterday’s closing price.