Although short selling -- the practice of selling borrowed shares with the hope of repaying the loan by buying back the shares at a lower price -- goes against the American belief that stocks always go up, I have long been fascinated with it. Short Stories discusses what works, what doesn't, and what some of the leading lights in shorting stocks think about its opportunities and threats. I describe possible short trades and I seek your comments and questions for story ideas. I don't offer any investment advice and I don't trade on any of the posts I write.

If you had followed my suggestion back on April 4th to sell short shares of Coast Financial Holdings Inc. (NASDAQ: CFHI) -- when it traded at $6.90 -- and cover your position this morning at $2.43, you could lock in a return of 184% -- pretty good for about seven weeks.

I have done consulting work for the Federal Deposit Insurance Corporation (FDIC), a leading bank regulator, and I worked for a large bank that got in trouble with bad real estate loans in the late 1980s. Yet I have never seen a bank regulator order a bank's board to fire its CEO. But according to the HeraldTribune, that is exactly what the FDIC and Florida Office of Financial Regulation ordered CFHI's board to do. And it complied -- replacing Brian Grimes with Anne Lee.

Although short selling -- the practice of selling borrowed shares with the hope of repaying the loan by buying back the shares at a lower price -- goes against the American belief that stocks always go up, I have long been fascinated with it. Short Stories discusses what works, what doesn't, and what some of the leading lights in shorting stocks think about its opportunities and threats. I describe possible short trades and I seek your comments and questions for story ideas. I don't offer any investment advice and I don't trade on any of the posts I write.

Monday the Wall Street Journal noted that two of the worst performing stocks in the first quarter were NovaStar Financial, Inc. (NYSE: NFI) and Bally Total Fitness, Inc. (NYSE: BFT) -- both of which I suggested shorting last year. Looking for some new short ideas? Last month I was in Florida where the real estate market is tanking.

Reading about a busted residential real estate development there in the Sarasota Herald-Tribune gave me another idea for short stories: Coast Financial Holdings, Inc. (NASDAQ: CFHI). Although its market capitalization has tumbled 59% to $44.9 million in the last year, CFHI could file for bankruptcy. How so? In a nutshell, Coast lent money to Florida real estate developers who are going belly up. As a result it's at risk of not having enough cash to pay a $12 million portion of its long-term debt which is due this year.

MOST NOTEWORTHY: The Kroger Co (KR) and Quest Diagnostics Inc (DGX) were today's most notable upgrades:

• Bank of America upgraded The Kroger Co (NYSE: KR) to Buy from Sell with a $29 target. Due to streamlined distribution and reduced SG&A expenses having closed the productivity gap with Wal-Mart Corp (NYSE: WMT), the firm believes Kroger is well positioned to accelerate growth and modestly increase operating margins.

• JP Morgan upgraded shares of Quest Diagnostics Inc (NYSE: DGX) to Overweight from Neutral as they not only believe the company's results will outperform expectations over the next few quarters, but that management will become more aggressive in the acquisitions market.

OTHER UPGRADES:

• Sterne Agee upgraded Coast Financial Holdings Inc (NASDAQ: CFHI) to Hold from Sell, with an $8.50 target.

• Goldman Sachs upgraded shares of Nova Chemical Corp (NYSE: NCX) to Neutral from Sell, with a $12 target, citing the potential sale of Nova's styrene business.

• Citing the possibility of a merger with Abitibi-Consolidated Inc (NYSE: ABY), Bowater Inc (NYSE: BOW) was upgraded to Neutral from Sell at Bank of America and to Buy from Hold at Soliel Securities.

Analyst summaries provided by TheFlyOnTheWall.com (subscription required).