Nomura Securities Co. said Monday its group pretax profit for the October-December quarter plunged 87.2 percent from a year earlier to 14.2 billion yen, hit by lower revenues amid a weaker domestic stock market.

Japan's largest brokerage house said its group operating revenues fell 15.2 percent to 264.3 billion yen, while group net profit came to 36.6 billion yen.

Against a backdrop of sluggish share prices, commission revenues dropped about 30 percent to 94.6 billion yen.