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JPMorgan Chase & Co (JPM.N) said it has racked up $1.5 billion of losses so far this quarter on mortgage-linked assets, reflecting deepening turmoil in credit markets.

Shares of the third-largest U.S. bank by assets fell as much as 7.9 percent, reflecting investors' disappointment with a bank that had largely sidestepped the worst of the credit crunch.

Chief Executive Jamie Dimon has kept JPMorgan profitable even as rivals such as Citigroup Inc (C.N) and Merrill Lynch & Co (MER.N) posted a series of multi-billion dollar quarterly losses. The bank revealed the losses in a regulatory filing late Monday.

"If you're a huge global trading house, it's very hard to hide from the devastation," said Steve Persky, chief executive at Dalton Investments in Los Angeles.

JPMorgan said trading conditions have "substantially deteriorated" in the third quarter, and mortgage-backed securities and loans have weakened.

The New York-based bank also has substantial exposure to credit cards and other consumer debt that looks increasingly vulnerable as the nation's economy grows slowly.

The Financial Times on Tuesday said JPMorgan is under pressure to write down mortgage assets, in part because of Merrill's decision to sell $30.6 billion of repackaged debt to a private equity fund at 22 cents on the dollar.

As of June 30, JPMorgan held $19.5 billion of prime and Alt-A mortgage exposure, $1.9 billion of subprime mortgage exposure, and $11.6 billion of commercial mortgage-backed securities (CMBS) exposure, Monday's filing showed.

"These mortgage exposures could be adversely affected by worsening market conditions, further deterioration in the housing market and market activity reflecting distressed sellers," JPMorgan said. Loss estimates exclude hedging, it said.

Trading results could also be hit if the bank's own debt became more valuable. That could theoretically make it more expensive to buy back its own debt, resulting in an accounting charge.

The bank did not immediately return a call seeking comment.

In afternoon trading, JPMorgan shares were down $3.04, or 7.3 percent, at $38.85, after earlier falling to $38.57.

CAUTIOUS OUTLOOK

Last month, JPMorgan posted a smaller-than-expected 53 percent decline in quarterly earnings on resilient stock and bond underwriting revenue but cautioned that the mortgage market and the economy were getting worse.

In Monday's filing, JPMorgan said that it expects continued credit deterioration in its consumer portfolio, requiring more reserves for losses, during the rest of 2008.

It also said home equity charge-offs could keep rising this year, while prime and subprime mortgage net charge-offs would likely rise "significantly." It said further mortgage deterioration was likely into 2009.

According to the filing, JPMorgan held $16.3 billion of unplaced loans funding buyouts and unfunded commitments for loans as of June 30.

"Leveraged loans and unfunded commitments are difficult to hedge effectively, and if market conditions further deteriorate, additional markdowns may be necessary," it said.

Lehman Brothers Inc analysts on Tuesday cut their 2008 profit forecast for JPMorgan to $2.30 a share from $2.60, but kept an "overweight" rating and $50 share price target.

(Reporting by Dan Wilchins in Washington; additional reporting by Tenzin Pema in Bangalore; Editing by Gerald E. McCormick and Mike Miller)