Mizuho Financial Group Inc. said Monday its group net profit in the three months ended June 30 soared 33.2 percent from a year earlier to 230.84 billion yen, due mainly to a 43.3 billion yen fall in tax-related expenses.

In a consolidated earnings report for the April-June first quarter, Mizuho Financial said its pretax profit rose 7.8 percent to 251.36 billion yen on a 13.7 percent jump in operating revenue to 858.16 billion yen.

The holding company cited such factors as a 5.5 billion yen rise in stock-related gains and a 6.9 billion yen cut in personnel and other operating expenses as reasons for the rise in profit.