<p>The S&P 500 ended nearly flat on Monday, with bank shares falling amid warnings of potential losses from a hedge fund's default on margin calls, while optimism over the economy limited the day's declines.</p>.<p>Shares of planemaker Boeing Co rose after the company reached a deal with US budget carrier Southwest Airlines Co for a variant of the 737 MAX aircraft.</p>.<p>Nomura and Credit Suisse are facing billions of dollars in losses after a US hedge fund, named by sources as Archegos Capital, defaulted on margin calls, putting investors on edge about who else might have been caught out.</p>.<p>Shares of big US banks and even regional banks fell. "There's still chatter as to whether or not, and which, American banks may be affected. That is a question that's lurking. But so far the market has taken (the news) in stride essentially," said Quincy Krosby, chief market strategist at Prudential Financial in Newark, New Jersey.</p>.<p>Optimism about speedy vaccinations and record stimulus, which drove the Dow and the S&P 500 to record closing highs last week, helped keep a floor in the market along with upbeat estimates for upcoming earnings, she said.</p>.<p>Unofficially, the Dow Jones Industrial Average rose 104.61 points, or 0.32%, to 33,177.49, the S&P 500 lost 3.25 points, or 0.08%, to 3,971.29 and the Nasdaq Composite dropped 79.08 points, or 0.6%, to 13,059.65.</p>.<p>The Nasdaq was on track to post its first monthly decline in five months.</p>.<p>Investors may also be adjusting their holdings for quarter-end "window dressing," Krosby said.</p>
<p>The S&P 500 ended nearly flat on Monday, with bank shares falling amid warnings of potential losses from a hedge fund's default on margin calls, while optimism over the economy limited the day's declines.</p>.<p>Shares of planemaker Boeing Co rose after the company reached a deal with US budget carrier Southwest Airlines Co for a variant of the 737 MAX aircraft.</p>.<p>Nomura and Credit Suisse are facing billions of dollars in losses after a US hedge fund, named by sources as Archegos Capital, defaulted on margin calls, putting investors on edge about who else might have been caught out.</p>.<p>Shares of big US banks and even regional banks fell. "There's still chatter as to whether or not, and which, American banks may be affected. That is a question that's lurking. But so far the market has taken (the news) in stride essentially," said Quincy Krosby, chief market strategist at Prudential Financial in Newark, New Jersey.</p>.<p>Optimism about speedy vaccinations and record stimulus, which drove the Dow and the S&P 500 to record closing highs last week, helped keep a floor in the market along with upbeat estimates for upcoming earnings, she said.</p>.<p>Unofficially, the Dow Jones Industrial Average rose 104.61 points, or 0.32%, to 33,177.49, the S&P 500 lost 3.25 points, or 0.08%, to 3,971.29 and the Nasdaq Composite dropped 79.08 points, or 0.6%, to 13,059.65.</p>.<p>The Nasdaq was on track to post its first monthly decline in five months.</p>.<p>Investors may also be adjusting their holdings for quarter-end "window dressing," Krosby said.</p>