Do corporate insiders know something we don't?

It stands to reason, doesn't it? Well then maybe we should be taking notice of this:

Can hundreds of stock-selling insiders be wrong?

The stock market has mounted an historic rally since it hit a low in March. The S&P 500 is up 55%, as U.S. job losses have slowed and credit markets have stabilized.

But against that improving backdrop, one indicator has turned distinctly bearish: Corporate officers and directors have been selling shares at a pace last seen just before the onset of the subprime malaise two years ago.

While a wave of insider selling doesn't necessarily foretell a stock market downturn, it suggests that those with the first read on business trends don't believe current stock prices are justified by economic fundamentals.

"It's not a very complicated story," said Charles Biderman, who runs market research firm Trim Tabs. "Insiders know better than you and me. If prices are too high, they sell."

Biderman, who says there were $31 worth of insider stock sales in August for every $1 of insider buys, isn't the only one who has taken note. Ben Silverman, director of research at the InsiderScore.com web site that tracks trading action, said insiders are selling at their most aggressive clip since the summer of 2007.

Hat tip to LargoWinch in this iTulip thread. Makes you wonder if all these claims that the recession is coming to an end aren't a bit premature...