BOSTON ( TheStreet) -- The largest U.S. companies, including JPMorgan ( JPM) and Intel ( INTC), are projecting better days ahead, beating analysts' expectations and helping to drive the Dow past 10,000 points for the first time in year.

But small companies, which constitute a majority of the stock market and the economy, are still suffering, suggesting investors ought to temper their bullishness after the Dow surged more than 50% since March. The following are three lesser-known companies whose profits have been decimated by weak demand. As such, they represent a real portrait of corporate America. Each reported after the close of stock-market trading yesterday.

Jacksonville, Florida-based Landstar System ( LSTR) is a transportation and logistics company. Third-quarter net income dropped 39% to $20 million and earnings per share fell 37% to 39 cents. Revenue descended 32% to $501 million.

Landstar posted a quarterly operating margin of 6.5% and a net margin of 4%. Chief Executive Officer Henry Gerkens noted that Landstar's revenue "continued to be negatively impacted by the recession in the domestic and global economies." A point of optimism: The number of loads hauled fell 11%, compared with a 16% drop in the second quarter.

Landstar's stock slumped as much as 3.3% today, putting the company in negative territory for 2009.

Stanley Furniture ( STLY) fared worse. The Virginia-based company manufactures and sells wood furniture in the upper price range. Its third-quarter net loss widened 45% to $5.1 million, or $1.01 a share, as revenue fell 29% to $38 million. The company endured a gross, operating and net loss.

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