updated 11/16/2007 7:59:07 PM ET 2007-11-17T00:59:07

Fannie Mae's bookkeeping is drawing scrutiny from Wall Street — again.

Three years after a stunning accounting scandal that forced it to restate earnings by $6.3 billion, the giant government-sponsored company that buys and sells home loans is on the defensive over a change in how it calculates potential losses from the growing mortgage crisis.

The fear among investors is that a new accounting methodology masks the number of bad loans held by Fannie, downplaying potential losses.

Shares of Fannie, the largest U.S. player in the market for mortgages that packaged into tradable securities, tanked for the second straight day on Friday, even as executives tried to assuage skeptical Wall Street analysts on a telephone conference call.

The stock, which fell $2.35, or 5.5 percent, to $40.69 percent, recovered from an earlier dive of more than 16 percent that brought shares to a 10-year low, following a 10 percent drop the day before. In bond markets, the risk premium on Fannie's debt — what it costs to insure its mortgage-backed securities — climbed.

Fannie disclosed its new calculation for potential mortgage losses last Friday, when it submitted several hundred pages of documents to the Securities and Exchange Commission. The filing brought the company's financial reporting up to date for the first time since 2004. But the bookkeeping change — and its potential impact — received significant attention on Thursday in an online article published by Fortune, which is owned by Time Warner Inc.

Using the new method, Fannie reported a so-called "annualized credit-loss ratio" of 4 basis points for the first nine months of this year, meaning the value of four out of every 1,000 mortgages it owns declined during that period. The Fortune article pointed out that under the old method, the credit-loss ratio for that period would have been 7.5 basis points — far exceeding Fannie's forecasts on the $2.4 trillion worth of mortgages it owns.

The adjustment is particularly unnerving to Wall Street because the company was racked by an accounting scandal in 2004 that resulted in government sanctions and a tarnished reputation.

"This just smacks too much of the accounting games the company was playing a couple years ago," said Armando Falcon, who headed the Office of Federal Housing Enterprise Oversight regulator of Fannie Mae at the time its accounting crisis erupted.

"They have very little room to play with here when it comes to trust and credibility," Falcon said in a telephone interview, adding that "it doesn't bode well for the new management."

The latest accounting uproar comes as Fannie pressures the government to further raise the mandated cap on its mortgage investment holdings, set at $735 billion after a two percent increase several months ago, as a way to help calm jittery credit markets.

"With this news, there is absolutely no justification" for Fannie being allowed to assume additional debt, said Rep. Richard Baker, R-La., a member of the House Financial Services Committee who is a longtime critic of the company. "We don't know the embedded risk yet."

The reaction on Wall Street was only slightly more forgiving.

Citigroup analyst Bradley Ball said while Fannie executives provided helpful explanations of some confusing accounting issues during Friday's call to analysts, the company "continues to fall short on providing sufficient detail for clear analysis of core operating results."

"Management was unable to assuage the market's main concerns about credit losses going forward," Ball wrote in a research note.

Washington-based Fannie reported a $1.4 billion third-quarter loss last week, while forecasting housing market woes through next year because of mounting home loan delinquencies.

In Friday's conference call, Chief Financial Officer Stephen Swad said some of the $670 million in provisions for credit losses on soured home loans that Fannie wrote off in the third quarter likely would be recovered.

"We book what we book under (generally accepted accounting principles) and we provide this disclosure to help you understand it," Swad said.

Several analysts asked the executives in the conference call why the company couldn't disclose what proportion of high-risk mortgages it is able to refinance into fixed-rate loans and save from default.

"The problem is that we don't have the underlying information," said Credit Suisse analyst Moshe Orenbuch.

Another analyst said in a report that Fannie's new calculation method is similar to that used by Freddie Mac, its smaller government-sponsored sibling, which also suffered a multibillion-dollar accounting scandal several years ago.

But Michael Cosgrove, a spokesman for Freddie Mac, said: "We believe that we have a different approach in how we account for these loans."

The current director of the Office of Federal Housing Enterprise Oversight, James B. Lockhart, would not have any comment Friday on the Fannie Mae matter, a spokeswoman said.

© 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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