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By April Joyner

NEW YORK (Reuters) – The benchmark S&P 500 index ended little changed on Monday after oscillating between positive and negative territory throughout the session after Citigroup Inc (N:) kicked off the earnings season with a mixed quarterly report.

The bank reported a better-than-expected profit but also a decline in its net interest margin. The fall in net interest margin triggered a fall in shares of other banks on concerns that it would presage lower profits across the industry as interest rates have dropped.

Though Citigroup shares erased nearly all their losses to end just 0.1% lower, the S&P 500 bank index <.SPXBK> slid 1.0%. Shares of JPMorgan Chase &

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