Maybank, with a market value of $14 billion, posted July-September net profit of 881.8 million ringgit ($260.6 million) compared with 572.2 million ringgit a year ago.
The earnings were higher than the average forecast of 720 million ringgit by four analysts surveyed by Reuters.
The lender, 65 percent owned by government-controlled agencies, has launched an ambitious restructuring plan this year to win a place among the top five banks in Southeast Asia following a series of expensive acquisitions in 2008.
Maybank shares have gained 50 percent this year, outperforming the 46 percent rise in the broader market index , but lagging the more than 100 percent gain by Malaysia's top deal maker CIMB.
(Reporting by Soo Ai Peng; Editing by Muralikumar Anantharaman and Niluksi Koswanage)
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