Citigroup's said today its quarterly profit plunged 27% as its trading revenue fell and its costs related to shrinking some businesses rose.
The profit decline is the biggest among big US banks that have reported first-quarter results so far.
But Citigroup's earnings and revenue beat Wall Street's low expectations, helped by a fall in operating expenses.
Citigroup is the fourth biggest US bank by assets. Banks globally have had a tough start to the year amid near-zero interest rates, a slowdown in China and low oil prices.
Citigroup's revenue from fixed income markets fell 11.5% to $3.09 billion, while investment banking revenue slumped 27.2% to $875m.
"While our market-sensitive products clearly suffered from weak investor sentiment during the quarter, we continued to make progress in several key areas," chief executive Michael Corbat said in a statement.
The bank said its operating expenses declined 3.3% to $10.5 billion.
Citi, like rivals such as JPMorgan Chase and Bank of America, has resorted to aggressive cost controls to underpin earnings over the past several quarters as revenue growth remains sluggish.
Citigroup, which has more assets in emerging markets than other US banks, has been exiting less profitable markets and cutting jobs to become more efficient. The company recorded $491m in "repositioning" charges.
The results come two days after Citigroup won a huge endorsement from US regulators, who determined that the bank was the only one of eight reviewed to have a credible plan to deal with a potential bankruptcy that did not rely on public money.
The endorsement gave investors reason to believe that Citigroup will win approval in June from the US Federal Reserve, which is stress-testing big banks, to return more money to shareholders.
Citigroup's net income fell to $3.5 billion, or $1.10 per share, in the first quarter ended March 31, beating the average analyst estimate of earnings of $1.03 per share, according to Thomson Reuters.
Revenue fell 11% to $17.56 billion, topping the average estimate of $17.48 billion.
