* Disappointing profits, outlooks fan recession fear
* Boeing, SanDisk, Exxon among top drags
* Emerging market fallout adds to negative tone
* Dow, S&P off almost 4 percent; Nasdaq off 2.4 pct (Updates to early afternoon, changes byline)
By Ellis Mnyandu
NEW YORK, Oct 22 (Reuters) - U.S. stocks fell for a second straight day on Wednesday as a parade of disappointing profits from bellwethers including aircraft maker Boeing Co <BA.N> increased fears that the global economy might be in the throes of recession.
Investors trimmed their exposure to risk, fueling another leg of a worldwide sell-off that punished Asian markets overnight and drove European indexes down about 5 percent or more.
Boeing, down 6 percent, was among the Dow's top drags, along with those energy companies, which slid on concern that faltering economic growth would mean less demand for oil.
AT&T <T.N> , down over 5 percent, posted a quarterly profit below Wall Street's forecasts as the top U.S. phone carrier grappled with pressure on wireless margins.
"Everybody is concerned about the global recession," said Dave Rovelli, managing director of U.S. equity trading at Canaccord Adams in New York.
He said news indicating that fallout from the global credit crisis was now rattling Hungary and Argentina added to the gloomy tone.
The Dow Jones industrial average <
> slid 341.69 points, or 3.78 percent, to 8,691.97. The Standard & Poor's 500 Index <.SPX> declined 36.64 points, or 3.84 percent, to 918.41. The Nasdaq Composite Index < > shed 40.44 points, or 2.38 percent, to 1,656.24.Of the Dow's 30 components, only McDonald's <MCD.N> was trading higher -- up 0.2 percent, or 13 cents, at $55.25 after the world's largest hamburger chain posted a quarterly profit that topped forecasts.
In contrast, Boeing shares fell 6.2 percent, or $2.89, to $43.51 on the New York Stock Exchange, where AT&T, another Dow component, slid 5.5 percent to $24.31.
Shares of Exxon Mobil Corp <XOM.N> shed 6.1 percent to $67.11. Rival ConocoPhillips, which slashed its 2008 exploration and production outlook, fell 8.1 percent to $49.60.
The S&P energy index <.GSPE> slid nearly 8 percent.
U.S. front-month crude <CLc1> shed $5.22, or 7.23 percent, to $66.96 a barrel.
Wachovia Corp <WB.N>, which is being bought by Wells Fargo & Co <WFC.N>, posted a third-quarter loss of $23.9 billion, a record quarterly loss for a banking company during the credit crisis. For details, see [
].Shares of Wachovia dropped 2.8 percent to $5.92, while Wells Fargo shares lost 3.6 percent to $31.47.
On Nasdaq, SanDisk <SNDK.O> plunged 31.3 percent to $10.13 after Samsung Electronics <005930.KS> ditched its $5.9 billion unsolicited bid for flash memory maker, citing SanDisk's deepening losses and uncertain outlook. [
].But Apple Inc <AAPL.O> bucked the trend, gaining 7.2 percent to $98.14, a day after the technology company reported a stronger-than-expected quarterly profit. Looking ahead, Apple, known to be conservative with projections, offered December quarter forecasts below Wall Street's expectations.
Yahoo Inc <YHOO.O> swam against the negative tide, jumping 5.3 percent to $12.70 on Nasdaq, as signs of strength in its other businesses offset its report of a sharply lower profit after Tuesday's closing bell. The Internet media company said it will slash at least 10 percent of its workforce.
Argentina's government proposed to seize almost $30 billion of private pension funds, while Hungary hiked interest rates to defend its currency.
Interbank borrowing costs fell again, but recession worries held sway as investors fretted about the extent to which the credit crisis has damaged the global economy. (Reporting by Ellis Mnyandu; Editing by Jan Paschal)