Nomura Holdings Inc. on Wednesday said profits dived 90.4 percent during the first six months of the fiscal year, with slumping stock prices eating away at commission revenues.

Group net profit at the nation's largest brokerage house totaled 11.3 billion yen for the six months through Sept. 30, while revenue fell 16.6 percent year-on-year to 550.4 billion yen.

Japan's once mighty conventional brokerages are in something of a vice: