The US banking giant lifted its reserves for loan losses by USD 233 million due to energy-related loans as company officials signaled they expect further hits to results throughout 2016 from pain in the oil patch.
"I wouldn't say that this quarter is going to be by far the largest quarter as yet," said chief financial officer John Gerspach.
But Gerspach said there is no evidence the oil bust is spreading to other sectors.
"We're not seeing any migration of the energy-related issues into the consumer book at all."
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The remarks came as Citigroup reported a 26.6 per cent decline in first-quarter earnings to USD 3.5 billion, as revenues tumbled 11.4 per cent to USD 17.6 billion.
Results were marred by a 27 per cent drop in investment banking revenue and lower revenues from several key trading divisions, including equity markets and fixed-income markets.
The bank's "market-sensitive products clearly suffered from weak investor sentiment during the quarter," said chief executive Michael Corbat.
The bank's set-asides for dodgy petroleum-related loans came on the heels of similar announcements earlier this week by JPMorgan Chase and other big banks as oil producers and contractors reel from the fall in oil prices above $100 a barrel in mid-2014 to roughly USD 35 a barrel in much of the first quarter.
Citigroup reclassified USD 730 million in loans in its institutional clients group as "non-accrual," or more likely to default, even though about two-thirds of this group are still performing, Gerspach said.
"We think it's appropriate to classify them as non-accrual given the overall difficulties we see in that industry," Gerspach said.