Futures down on Goldman worries, Citi results eyed

Stock index futures fell on Monday as lingering concerns over fraud charges against Goldman Sachs weighed on investor sentiment.

Bank stocks are expected to be in focus, following a steep decline Friday after Goldman was charged with fraud by the U.S. Securities and Exchange Commission in the structuring and marketing of a debt product tied to subprime mortgages.

Investors will eye further quarterly corporate earnings, with Citigroup expected to post results before Wall Street opens.

Questions surrounding Goldman were increasing the chances of tougher reform of financial regulations as it was seized on by politicians in the U.S. and Europe as a reason for closer scrutiny or tighter rules for banks, which could hurt their profits.

Treasury Secretary Timothy Geithner on Sunday expressed confidence that lawmakers will bridge partisan differences on the overhaul of financial regulations and pass a bill that protects taxpayers from financing future bailouts.

S&P 500 futures fell 6.6 points and were below fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures lost 48 points and Nasdaq 100 futures dropped 9.75 points.

Among other firms reporting on Monday are IBM , Eli Lilly , Halliburton Co , M&T Bank Corp and Zions Bancorp .

Airline companies are also set to be in the spotlight, as widespread disruptions swept across European airports due to a volcanic ash cloud that has forced carriers to cancel tens of thousands of flights in and out of Europe.

Investor risk aversion also tackled the euro in favor of the low-yielding yen. The U.S. dollar index .DXY>, a gauge of the greenback against a basket of currencies, rose 0.5 percent.

U.S. data set for release on Monday include the Conference Board's Leading Indicators for March, due at 10 a.m. ET.

(Reporting by Rodrigo Campos, editing by W Simon )