Mizuho Financial Group Inc. led the nation's three biggest banks in forecasting a drop in earnings for this year as loan growth loses momentum and returns from stock investments wane.

Japan's third-largest lender by market value said net income may fall 20 percent from a record to ¥550 billion in the year ending next March.

Mitsubishi UFJ Financial Group Inc. projected a 3.5 percent decrease to ¥950 billion and Sumitomo Mitsui Financial Group Inc. forecast a 19 percent drop to ¥680 billion, statements showed Wednesday.