Diodes, Sonic Solutions, Xerium: U.S. Small-Cap Equity Movers

The Russell 2000 Index fell for a fourth day, dropping 1 percent to 725.59 at 10:57 a.m. in New York. The Standard & Poor's 500 Index (SPX), whose companies have a median market value 21 times larger than the Russell 2000's, lost 0.9 percent. The stock indexes have declined 5.2 percent and 8.3 percent, respectively, this year.

Amerigroup Corp. (AGP) fell 12 percent, the most since March 19, to $23.93. The provider of managed health care for low- income Americans suspended its annual profit forecast and said medical costs in Tennessee have been higher than expected.

Central Garden & Pet Co. (CENTA) had the biggest drop since November, losing 33 percent to $4.67. The seller of Pennington grass seed and Sevin bug killer said it's ``less optimistic'' it will report higher earnings than last year because it has been unable to offset rising grain costs with price increases.

Diodes Inc. (DIOD) rose 7.3 percent, the most since April 16, to $29.50. The maker of electronic components used in computers and DVD players said second-quarter revenue will be higher than previously forecast because of contributions from Zetex Plc, which it bought June 9.

Hooker Furniture Corp. (HOFT) had the steepest loss in a year, dropping 14 percent to $17.51. The furniture retailer predicted ``sluggish'' business for the rest of 2008 as the weakening U.S. economy reduces consumer spending.

Marshall & Ilsley Corp. (MI US) fell 4.6 percent to $19.41, the lowest since October 2002. Wisconsin's biggest bank was added to the ``conviction sell list'' at Goldman Sachs Group Inc. Marshall & Ilsley is ``among the most exposed'' to impairment of construction loans, which is likely to be ``the dominant issue for mid-cap banks'' in the second quarter, analysts led by Brian Foran wrote in a report.

Rex Energy Corp. (REXX) gained 8.2 percent to $29.27, the highest since shares began trading a year ago. The oil and gas company was recommended by CNBC ``Mad Money'' host Jim Cramer, who called the company a ``wildcatter'' because of its potential to find new oil in the Marcellus Shale region.

Sonic Solutions Inc. (SNIC US) slumped 13 percent, the most since August, to $6.66. The maker of recording software for video discs forecast first-quarter sales lower than analysts' estimates.

Xerium Technologies Inc. (XRM) added 6.8 percent to $5.32, the highest since Feb. 19. The maker of paper manufacturing equipment was raised to ``buy'' from ``hold'' by Citigroup Inc. analysts.

To contact the reporter on this story: Lynn Thomasson in New York at lthomasson@bloomberg.net.

To contact the editor responsible for this story: Chris Nagi at chrisnagi@bloomberg.net

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