By Atsuko Fukase 

TOKYO--Japan's largest bank, Mitsubishi UFJ Financial Group Inc., reported a record nine-month profit figure thanks to operations in the U.S. and Thailand, showing how international business can overcome thin margins at home for Japanese lenders.

Among Japan's top three banks, MUFG was the only one to see profit growth from a year earlier. It holds a stake of about 20% in Morgan Stanley, the U.S. investment bank, and also owns San Francisco-based Union Bank and Bank of Ayudhya in Thailand.

In the nine months through December, MUFG reported net income of Yen927 billion ($7.9 billion), up 18% from a year earlier. Of that, Yen97 billion came from the Morgan Stanley investment, Yen65 billion from Union Bank and Yen28 billion from Bank of Ayudhya.

Another plus was the weak yen, which increases the value in yen of dollars earned overseas. MUFG said the yen's fall against the dollar generated an additional pretax profit of about Yen50 billion during the nine-month period. The bank gets about 40% of its profit from outside Japan. Currently the dollar is trading at around Yen117, up from Yen103 in April 2014 at the beginning of the bank's fiscal year.

MUFG and the other two Japanese megabanks-- Sumitomo Mitsui Financial Group Inc. and Mizuho Financial Group Inc.--have been beefing up overseas operations in the face of poor growth prospects at home.

Following the Bank of Japan's aggressive easing, the yield on the benchmark 10-year Japanese government bond briefly dropped below 0.2% in January before recovering Tuesday to 0.36%. Borrowing rates are also low, meaning banks' profit margins are slim. In addition, with many blue-chip corporations building up cash on their balance sheets, demand for loans is weak.

Hoping to expand overseas in areas such as corporate lending and project finance, SMFG bought a 40% stake in Indonesian lender PT Bank Tabungan Pensiunan Nasional in two stages over the past two years. It also bulked up its aircraft-leasing business abroad. Mizuho was part of a group providing $45 billion to finance Actavis PLC's planned purchase of U.S. drug maker Allergan Inc.

But overseas profits at the No. 2 and No. 3 banks weren't enough to make up for domestic weakness. Last week, SMFG reported net income of Yen682 billion, down 3.2% from a year earlier, and Mizuho saw a 7% drop, posting Yen523 billion in net income.

Naoko Nemoto, an analyst at Standard & Poor's, said the boost that banks are getting from their non-Japanese businesses may not last. "There's uncertainty over several factors including plunging oil prices and the European economy, which could weigh on banks' overseas profits," she said. "Now is a turning point for megabanks for profitability, and they may not be able to sustain stable profits as they do now."

Write to Atsuko Fukase at atsuko.fukase@wsj.com

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