By Christina Rexrode And Peter Rudegeair 

Citigroup Inc. said Thursday its first-quarter profit jumped a larger-than-expected 21%, with the bank slashing costs to overcome a drop in trading revenue.

Shares rose 2.2% to $54.41 in midday trading.

The New York-based bank reported a profit of $4.77 billion, or $1.51 a share. That compared with $3.94 billion, or $1.23 a share, a year ago. Excluding one-time items, per-share earnings were $1.52, beating the $1.39 a share projected by analysts polled by Thomson Reuters.

Revenue slipped 2.3% to $19.74 billion, but the adjusted revenue of $19.81 billion was basically in line with what analysts had expected, $19.82 billion.

The bank slashed operating expenses by 10% to $10.88 billion, better than analysts had expected. It trimmed spending on compensation, equipment, advertising and other business costs.

Legal expenses also fell from a year ago, when the bank was preparing for a mortgage-securities settlement with the Justice Department. So did repositioning costs, which can include severance and related expenses a company pays when it is shrinking or rejiggering businesses.

"This is a big deal," said BMO Capital Markets analyst James Fotheringham.

However, there were also questions about how long the momentum can last.

"Is this as good as it gets?" asked CLSA analyst Mike Mayo. "Is this a false start for Citigroup or is there a lot more ahead?"

Chief Executive Officer Michael Corbat replied that the bank had made substantive changes to diversify its revenue sources. The company also noted that it was able to raise earnings even amid a backdrop of lower trading revenue and lower results from consumer banking outside the U.S.

Sanford C. Bernstein analyst John McDonald said the quarter validated the bank's overall strategy of simplifying and slimming down, a mission it has been on since it was battered in the financial crisis.

Profit in the consumer bank rose 3%, fueled by U.S. consumer banking. Profit in the investment bank and related units were roughly flat, hurt by the drop in trading revenue.

Citigroup's trading revenue was down 9.5%, to $4.36 billion from $4.81 billion a year ago. That was worse than J.P. Morgan Chase & Co. and Goldman Sachs Group Inc., which logged increases, and Bank of America Corp., which fell by a smaller proportion.

Part of the difference among the banks' trading results relates to the types of products they focus on. J.P. Morgan tends to trade currencies and rate products, which had a strong quarter. Citigroup and Bank of America focus on so-called spread products like mortgage-backed securities and corporate bonds, which had a weak quarter.

Also, Citigroup lost money when the Swiss franc unexpectedly surged earlier this year, while J.P. Morgan and Bank of America both made money.

Low interest rates have been another theme of this quarter's earnings, with analysts and investors asking whether banks have a strategy to move forward even if rates stay low. Like other banks, Citigroup is eager for interest rates to rise, because that will allow it to charge more on loans.

But Chief Financial Officer John Gerspach emphasized that Citigroup isn't dependent on rates going higher, saying the bank plans to meet this year's financial targets regardless of how tough the rate environment might be.

"We weren't expecting to be bailed out by any sort of significant rate increase," Mr. Gerspach said, "and it doesn't look like that's going to happen."

Compared to some of its peers, Citigroup is less affected by low U.S. interest rates because many of its loans and deposits are outside the U.S., including in regions where interest rates are more favorable to the bank.

In investment banking, Citigroup earned $298 million in fees from advising on mergers in the first quarter, up 70% from $175 million the year before. Merger advisory revenue was also up at J.P. Morgan, Bank of America and Goldman, a signal that companies are eager for deal-making.

Overall, the tone was far calmer than earnings a year ago, which were announced shortly after the bank had failed the Federal Reserve's stress test. Mr. Corbat at the time vowed to find an "industrial-strength" solution to the stress-test missteps. Last month the Fed approved Citigroup's stress-test request to raise its dividend for the first time since the financial crisis.

Write to Christina Rexrode at christina.rexrode@wsj.com and Peter Rudegeair at peter.rudegeair@wsj.com

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